Industrial Robotics

Topic Information

Dear Colleagues,

Nowadays, industrial robotics has become a science in continuous evolution. The implementation and role of robots in production lines and other traditional frames are being widely revised, since robots are rapidly changing from slave devices to cyber-physical systems in the Industry 4.0 framework. In this context, research on robot mechanics, modelling, design, and control is going to play an increasingly central role. Furthermore, new robot architectures have been developed: cable-driven robotics allow one to increase the performance of manipulators in terms of both small moving masses and large work areas; collaborative and mobile robotics allow a greater human–machine iteration, in terms of both collaboration and cooperation, also within the industrial production lines.

The aim of this topic is to attract recent and relevant research in the following fields:

• Robot design and kinematics
• Dynamics of robots and mechanical systems
• Control of robots
• Trajectory planning
• Industrial applications
• Performance evaluation
• Collaborative robotics
• Mobile robotics
• Industrial cable driven robots

Prof. Dr. Giovanni Boschetti
Prof. Dr. João Miguel da Costa Sousa
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Applied Sciences applsci	2.5	5.3	2011	18.4 Days	CHF 2400
Robotics robotics	2.9	6.7	2012	21 Days	CHF 1800
Automation automation	-	2.9	2020	24.1 Days	CHF 1000
Machines machines	2.1	3.0	2013	15.5 Days	CHF 2400

Preprints.org is a multidisciplinary platform offering a preprint service designed to facilitate the early sharing of your research. It supports and empowers your research journey from the very beginning.

MDPI Topics is collaborating with Preprints.org and has established a direct connection between MDPI journals and the platform. Authors are encouraged to take advantage of this opportunity by posting their preprints at Preprints.org prior to publication:

1. Share your research immediately: disseminate your ideas prior to publication and establish priority for your work.
2. Safeguard your intellectual contribution: Protect your ideas with a time-stamped preprint that serves as proof of your research timeline.
3. Boost visibility and impact: Increase the reach and influence of your research by making it accessible to a global audience.
4. Gain early feedback: Receive valuable input and insights from peers before submitting to a journal.
5. Ensure broad indexing: Web of Science (Preprint Citation Index), Google Scholar, Crossref, SHARE, PrePubMed, Scilit and Europe PMC.

Published Papers (24 papers)

Order results

Content type Publication Date

Result details

Normal Extended Compact

Journals

All Applied Sciences Robotics Automation Machines

Show export options expand_more Show export options expand_less

Select all

Export citation of selected articles as:

Plain Text BibTeX BibTeX (without abstracts) Endnote Endnote (without abstracts) Tab-delimited RIS

Error

Oops... you haven't selected anything for export.

Ok

clear

10 pages, 56527 KiB  

Open AccessArticle

Feasibility Study on Automation of Zinc Ash Skimming Process in Batch Galvanising

by Jana Pöpperlová, Stephan Ottweiler, Andreas Vossberg and Ulrich Krupp

Automation 2023, 4(1), 1-10; https://doi.org/10.3390/automation4010001 - 28 Dec 2022

Viewed by 3018

Abstract

The aim of the presented feasibility study was to systematically investigate the automation of the skimming (i.e., removal) of zinc ash from the surface of the zinc bath in order to minimise the risks for workers due to mechanical hazards (risk of falling [...] Read more.

The aim of the presented feasibility study was to systematically investigate the automation of the skimming (i.e., removal) of zinc ash from the surface of the zinc bath in order to minimise the risks for workers due to mechanical hazards (risk of falling into the zinc kettle) and chemical hazards (inhalation exposure to zinc vapours) by eliminating this activity. As part of the feasibility study, automatic separation and skimming systems from various applications, such as removal systems of slags and metal foam, were identified. For this purpose, their technical feasibility and suitability were considered. Two automated techniques, a mechanical and a gas-based skimming system, were selected for the subsequent laboratory-based evaluation. In the scope of the practical feasibility study, the selected skimming techniques were designed, constructed, and evaluated based on near-process prototype tests on a laboratory scale. The focus was on the efficiency of the skimming systems, related to the removal of zinc ash from the free surface of the molten zinc (general efficiency), as well as to the zinc ash removal with a simulated attachment system of the samples to be galvanised (task-related efficiency). The desired complete removal of zinc ash from the zinc bath surface was demonstrated with two automated methods: a pulse wave method of the mechanical skimming system and a gas-based skimming system in general, operating independently from the attachment system. Additionally, as part of the process-related simulation of the complete batch galvanising process, a fully automated combination of the zinc ash skimming and extraction system was achieved on a laboratory scale. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

17 pages, 6679 KiB  

Open AccessArticle

A Robotic Platform for Aircraft Composite Structure Inspection Using Thermography

by Amalka Indupama Samarathunga, Neelanjana Piyasundara, Anuka Iroshan Wanigasooriya, Buddhika Sampath Kumara, Vimukkthi Priyadarshana Vithanage and Damith Suresh Chathuranga

Robotics 2022, 11(3), 62; https://doi.org/10.3390/robotics11030062 - 15 May 2022

Cited by 4 | Viewed by 3606

Abstract

Water ingression is a critical issue in honeycomb composite structures, which could result in catastrophic structural failure. In the aviation industry, they are widely used to manufacture critical aircraft structural components including fuselage, wings, and flight control surfaces. Catastrophic failure of these structures [...] Read more.

Water ingression is a critical issue in honeycomb composite structures, which could result in catastrophic structural failure. In the aviation industry, they are widely used to manufacture critical aircraft structural components including fuselage, wings, and flight control surfaces. Catastrophic failure of these structures would be disastrous, thus identifying water accumulation in earlier stages of the defect is necessary. The conventional non-destructive testing method is thermography which is performed using handheld thermography cameras by manually accessing the specific areas. This method of inspection has been identified to be a risky, costly, time-consuming, and inspector-dependent technique. This paper describes using a wall-climbing robotic platform that can be controlled remotely to access and perform the inspection on a targeted structural area replacing the manual process. The designed wall-climbing inspection robot onboard a heat pump to stimulate the composite surface to an adequate temperature and, an infrared sensor to feed the real-time temperature data via Bluetooth serial communication to a remote computer system to be processed into a thermal image and evaluated to determine the presence of water. The results obtained from the thermographic sensor are validated with the comparison of the Fluke thermography camera. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

17 pages, 3588 KiB  

Open AccessArticle

Obstacle Avoidance Path Planning for the Dual-Arm Robot Based on an Improved RRT Algorithm

by Wubin Shi, Ke Wang, Chong Zhao and Mengqi Tian

Appl. Sci. 2022, 12(8), 4087; https://doi.org/10.3390/app12084087 - 18 Apr 2022

Cited by 25 | Viewed by 5654

Abstract

In the future of automated production processes, the manipulator must be more efficient to complete certain tasks. Compared to single-arm robots, dual-arm robots have a larger workspace and stronger load capacity. Coordinated motion planning of multi-arm robots is a problem that must be [...] Read more.

In the future of automated production processes, the manipulator must be more efficient to complete certain tasks. Compared to single-arm robots, dual-arm robots have a larger workspace and stronger load capacity. Coordinated motion planning of multi-arm robots is a problem that must be solved in the process of robot development. This paper proposes an obstacle avoidance path planning method for the dual-arm robot based on the goal probability bias and cost function in a rapidly-exploring random tree algorithm (GA_RRT). The random tree grows to the goal point with a certain probability. At the same time, the cost function is calculated when the random state is generated. The point with the lowest cost is selected as the child node. This reduces the randomness and blindness of the RRT algorithm in the expansion process. The detection algorithm of the bounding sphere is used in the process of collision detection of two arms. The main arm conducts obstacle avoidance path planning for static obstacles. The slave arm not only considers static obstacles, but also takes on the role of the main arm at each moment as a dynamic obstacle for path planning. Finally, MATLAB is used for algorithm simulation, which proves the effectiveness of the algorithm for obstacle avoidance path planning problems for the dual-arm robot. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

18 pages, 5295 KiB  

Open AccessArticle

An Online Task-Planning Framework Using Mixed Integer Programming for Multiple Cooking Tasks Using a Dual-Arm Robot

by June-sup Yi, Tuan Anh Luong, Hosik Chae, Min Sung Ahn, Donghun Noh, Huy Nguyen Tran, Myeongyun Doh, Eugene Auh, Nabih Pico, Francisco Yumbla, Dennis Hong and Hyungpil Moon

Appl. Sci. 2022, 12(8), 4018; https://doi.org/10.3390/app12084018 - 15 Apr 2022

Cited by 10 | Viewed by 3225

Abstract

This work proposes an online task-scheduling method using mixed-integer programming for a multi-tasking problem regarding a dual-arm cooking robot in a controlled environment. Given each task’s processing time, their location in the working space, dependency, the required number of arms, and the kinematic [...] Read more.

This work proposes an online task-scheduling method using mixed-integer programming for a multi-tasking problem regarding a dual-arm cooking robot in a controlled environment. Given each task’s processing time, their location in the working space, dependency, the required number of arms, and the kinematic constraints of the dual-arm robot, the proposed optimization algorithm can produce a feasible solution to scheduling the cooking order for each task and for each associated arms so that the total cooking time and the total moving distance for each arm are minimized. We use a subproblem optimization strategy in which the number of tasks to be planned is divided into several groups instead of planning all tasks at the same time. By doing so, the planning time can be significantly decreased, making the algorithm practical for online implementation. The feasibility of our optimization method and the effectiveness of the subproblem optimization strategy were verified through simulated experiments consisting of 30 to 120 tasks. The results showed that our strategy is advantageous in terms of computation time and makespan for large problems. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

30 pages, 5320 KiB  

Open AccessArticle

Investigating the Impact of Triangle and Quadrangle Mesh Representations on AGV Path Planning for Various Indoor Environments: With or Without Inflation

by Ahmadreza Meysami, Jean-Christophe Cuillière, Vincent François and Sousso Kelouwani

Robotics 2022, 11(2), 50; https://doi.org/10.3390/robotics11020050 - 13 Apr 2022

Cited by 12 | Viewed by 4160

Abstract

In a factory with different kinds of spatial atmosphere (warehouses, corridors, small or large workshops with varying sizes of obstacles and distribution patterns), the robot’s generated paths for navigation tasks mainly depend on the representation of that environment. Hence, finding the best representation [...] Read more.

In a factory with different kinds of spatial atmosphere (warehouses, corridors, small or large workshops with varying sizes of obstacles and distribution patterns), the robot’s generated paths for navigation tasks mainly depend on the representation of that environment. Hence, finding the best representation for each particular environment is necessary to forge a compromise between length, safety, and complexity of path planning. This paper aims to scrutinize the impact of environment model representation on the performance of an automated guided vehicle (AGV). To do so, a multi-objective cost function, considering the length of the path, its complexity, and minimum distance to obstacles, is defined for a perfect circular robot. Unlike other similar studies, three types of representation, namely quadrangle, irregular triangle, and varying-size irregular triangle, are then utilized to model the environment while applying an inflation layer to the discretized view. Finally, a navigation scenario is tested for different cell decomposition methods and an inflation layer size. The obtained results indicate that a nearly constant coarse size triangular mesh is a good candidate for a fixed-size robot in a non-changing environment. Moreover, the varying size of the triangular mesh and grid cell representations are better choices for factories with changing plans and multi-robot sizes due to the effect of the inflation layer. Based on the definition of a metric, which is a criterion for quantifying the performance of path planning on a representation type, constant or variable size triangle shapes are the only and best candidate for discretization in about 59% of industrial environments. In other cases, both cell types, the square and the triangle, can together be the best representation. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

13 pages, 5667 KiB  

Open AccessArticle

A Path Tracking Method of a Wall-Climbing Robot towards Autonomous Inspection of Steel Box Girder

by Wei Song, Zhijian Wang, Tong Wang, Daxiong Ji and Shiqiang Zhu

Machines 2022, 10(4), 256; https://doi.org/10.3390/machines10040256 - 2 Apr 2022

Cited by 6 | Viewed by 2947

Abstract

This paper proposes an autonomous inspection method for steel box girders that uses a wall-climbing robot instead of human workers. According to the 3D operating environment inside the steel box girder, the method proposes a 3D path for the robot to traverse positions [...] Read more.

This paper proposes an autonomous inspection method for steel box girders that uses a wall-climbing robot instead of human workers. According to the 3D operating environment inside the steel box girder, the method proposes a 3D path for the robot to traverse positions to be inspected. The path comprises two alternate sections of the lane’s centerline and U-shaped steering. To realize the robot’s tracking of the desired path, kinematics analysis based on different poses during the inspection was carried out. Corresponding path tracking algorithms were adopted to ensure that the robot moves accurately and efficiently. In addition, for the smooth transition of the two path sections, this method adopts an algorithm of cooperatively controlling the lifting mechanism and the wheel speeds to achieve stable crossing of a 90° concave corner. Finally, experiment results show that the robot can steadily cross 90° concave corner and can steer to the adjacent lane and complete lane inspection along the desired path. The method can realize autonomous inspection for steel box girders using the wall-climbing robot. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

attachment

Supplementary material:
Supplementary File 1 (ZIP, 17059 KiB)

14 pages, 5126 KiB  

Open AccessArticle

Detachable Soft Actuators with Tunable Stiffness Based on Wire Jamming

by Long Bai, Hao Yan, Jiafeng Li, Jiefeng Shan and Penghao Hou

Appl. Sci. 2022, 12(7), 3582; https://doi.org/10.3390/app12073582 - 1 Apr 2022

Cited by 10 | Viewed by 4135

Abstract

The integration of variable stiffness materials and structures into soft robots is a popular trend, allowing soft robots to switch between soft and rigid states in different situations. This concept combines the advantages of rigid mechanisms and soft robots, resulting in not only [...] Read more.

The integration of variable stiffness materials and structures into soft robots is a popular trend, allowing soft robots to switch between soft and rigid states in different situations. This concept combines the advantages of rigid mechanisms and soft robots, resulting in not only excellent flexibility but also tunable stiffness for high load capacity and fast and precise operation. Here, a stiffness-tunable soft actuator based on wire/fiber jamming structure is proposed, where the fiber-reinforced soft actuator is responsible for the bending motion, and the jamming structure acts as a stiffness-tunable layer controlled by vacuum pressure. The primary design objective of this study is to fabricate a jamming structure with wide-range stiffness, universal adaptability and high dexterity. Thus, the behaviors of wire/fiber jamming structures with different layouts, materials and wire arrangements are analyzed, and a theoretical model is developed to predict the effect of geometric parameters. Experimental characterizations show that the stiffness can be significantly enhanced in the bending direction, while the stiffness is smaller in the torsion direction. Additionally, by integrating Velcro strips into the design, a quick and detachable scheme for the stiffness-tunable soft actuator is achieved. Application examples exhibit high load capacity and good shape adaptability. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Graphical abstract

16 pages, 15472 KiB  

Open AccessArticle

Deep Deterministic Policy Gradient with Reward Function Based on Fuzzy Logic for Robotic Peg-in-Hole Assembly Tasks

by Ziyue Wang, Fengming Li, Yu Men, Tianyu Fu, Xuting Yang and Rui Song

Appl. Sci. 2022, 12(6), 3181; https://doi.org/10.3390/app12063181 - 21 Mar 2022

Cited by 6 | Viewed by 2704

Abstract

Robot automatic assembly of weak stiffness parts is difficult due to potential deformation during assembly. The robot manipulation cannot adapt to the dynamic contact changes during the assembly process. A robot assembly skill learning system is designed by combining the compliance control and [...] Read more.

Robot automatic assembly of weak stiffness parts is difficult due to potential deformation during assembly. The robot manipulation cannot adapt to the dynamic contact changes during the assembly process. A robot assembly skill learning system is designed by combining the compliance control and deep reinforcement, which could acquire a better robot assembly strategy. In this paper, a robot assembly strategy learning method based on variable impedance control is proposed to solve the robot assembly contact tasks. During the assembly process, the quality evaluation is designed based on fuzzy logic, and the impedance parameters in the assembly process are studied with a deep deterministic policy gradient. Finally, the effectiveness of the method is verified using the KUKA iiwa robot in the weak stiffness peg-in-hole assembly. Experimental results show that the robot obtains the robot assembly strategy with variable compliant in the process of weak stiffness peg-in-hole assembly. Compared with the previous methods, the assembly success rate of the proposed method reaches 100%. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

20 pages, 6454 KiB  

Open AccessArticle

Sliding Mode Controller with Generalized Extended State Observer for Single Link Flexible Manipulator

by Tushar Bhaskarwar, Huzein Fahmi Hawari, Nursyarizal B. M. Nor, Rajan Hari Chile, Dhammaratna Waghmare and Sumit Aole

Appl. Sci. 2022, 12(6), 3079; https://doi.org/10.3390/app12063079 - 17 Mar 2022

Cited by 4 | Viewed by 2191

Abstract

This paper presents an enhanced generalized extended state observer (EGESO) based sliding mode control (SMC) technique for dealing with the disturbance attenuation problem for a class of non-integral chain systems with mismatched uncertainty. In the proposed control law, the robust SMC with reaching [...] Read more.

This paper presents an enhanced generalized extended state observer (EGESO) based sliding mode control (SMC) technique for dealing with the disturbance attenuation problem for a class of non-integral chain systems with mismatched uncertainty. In the proposed control law, the robust SMC with reaching phase elimination is applied in the proposed control law, which uses the estimated states of a system. The stability analysis is thoroughly examined for both EGESO and SMC. The efficacy of the proposed controller is verified using specific examples, and later it is applied on a single-link flexible manipulator. Through simulation and experimentation analysis, it is observed that the proposed controller is giving a robust transient response as compared to existing GESO based controllers. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

16 pages, 3944 KiB  

Open AccessArticle

Visual Sorting Method Based on Multi-Modal Information Fusion

by Song Han, Xiaoping Liu and Gang Wang

Appl. Sci. 2022, 12(6), 2946; https://doi.org/10.3390/app12062946 - 14 Mar 2022

Cited by 2 | Viewed by 2756

Abstract

Visual sorting of stacked parcels is a key issue in intelligent logistics sorting systems. In order to improve the sorting success rate of express parcels and effectively obtain the sorting order of express parcels, a visual sorting method based on multi-modal information fusion [...] Read more.

Visual sorting of stacked parcels is a key issue in intelligent logistics sorting systems. In order to improve the sorting success rate of express parcels and effectively obtain the sorting order of express parcels, a visual sorting method based on multi-modal information fusion (VS-MF) is proposed in this paper. Firstly, an object detection network based on multi-modal information fusion (OD-MF) is proposed. The global gradient feature is extracted from depth information as a self-attention module. More spatial features are learned by the network, and the detection accuracy is improved significantly. Secondly, a multi-modal segmentation network based on Swin Transformer (MS-ST) is proposed to detect the optimal sorting positions and poses of parcels. More fine-grained information of the sorting parcels and the relationships between them are gained by adding Swin Transformer models. Frequency domain information and depth information are used as supervision signals to obtain the pickable areas and infer the occlusion degrees of parcels. A strategy for the optimal sorting order is also proposed to ensure the stability of the system. Finally, a sorting system with a 6-DOF robot is constructed to complete the sorting task of stacked parcels. The accuracy and stability the system are verified by sorting experiments. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

19 pages, 10812 KiB  

Open AccessArticle

Design and Analysis of a Stiffness-Enhanced 3-PPS Parallel Mechanism for Fault-Tolerant Underwater Vectored Thrusters

by Dexin Jiang, Tianjiang Zheng, Guilin Yang, Yingzhong Tian, Zaojun Fang, Huamin Li, Chi Zhang and Hongwu Ye

Machines 2022, 10(2), 88; https://doi.org/10.3390/machines10020088 - 25 Jan 2022

Cited by 7 | Viewed by 3027

Abstract

Vectored thrusters can significantly improve the maneuverability of underwater vehicles. However, due to the harsh underwater environment and severe working conditions, the thrust-vectoring device needs to be designed with high stiffness and high reliability. In this paper, a 3-degree-of-freedom (3-DOF) 3-PPS parallel mechanism [...] Read more.

Vectored thrusters can significantly improve the maneuverability of underwater vehicles. However, due to the harsh underwater environment and severe working conditions, the thrust-vectoring device needs to be designed with high stiffness and high reliability. In this paper, a 3-degree-of-freedom (3-DOF) 3-PPS parallel mechanism is employed for the 2-DOF thrust-vectoring device, which has the advantages of high stiffness and a certain level of fault tolerance. The stiffness of the 3-PPS parallel mechanism is enhanced through employing additional passive prismatic joints. Based on the zero-torsion characteristics of the parallel mechanism, closed-form solutions are obtained for displacement analyses, and the orientation workspace of the moving platform under an actuation failure, i.e., one of the active prismatic joints is locked, is particularly investigated through an equi-volumetric partition method. To analyze the orientation workspace distribution under the actuation failure, the fault-tolerant workspace and the maximum inscribed workspace are defined. Furthermore, a new fault-tolerant index is proposed to evaluate the fault tolerance of the parallel mechanism. The proposed design analysis is validated through experiments on an engineering prototype of the parallel mechanism. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

15 pages, 3316 KiB  

Open AccessArticle

Optimizing Cycle Time of Industrial Robotic Tasks with Multiple Feasible Configurations at the Working Points

by Matteo Bottin, Giovanni Boschetti and Giulio Rosati

Robotics 2022, 11(1), 16; https://doi.org/10.3390/robotics11010016 - 15 Jan 2022

Cited by 2 | Viewed by 3761

Abstract

Industrial robot applications should be designed to allow the robot to provide the best performance for increasing throughput. In this regard, both trajectory and task order optimization are crucial, since they can heavily impact cycle time. Moreover, it is very common for a [...] Read more.

Industrial robot applications should be designed to allow the robot to provide the best performance for increasing throughput. In this regard, both trajectory and task order optimization are crucial, since they can heavily impact cycle time. Moreover, it is very common for a robotic application to be kinematically or functionally redundant so that multiple arm configurations may fulfill the same task at the working points. In this context, even if the working cycle is composed of a small number of points, the number of possible sequences can be very high, so that the robot programmer usually cannot evaluate them all to obtain the shortest possible cycle time. One of the most well-known problems used to define the optimal task order is the Travelling Salesman Problem (TSP), but in its original formulation, it does not allow to consider different robot configurations at the same working point. This paper aims at overcoming TSP limitations by adding some mathematical and conceptual constraints to the problem. With such improvements, TSP can be used successfully to optimize the cycle time of industrial robotic tasks where multiple configurations are allowed at the working points. Simulation and experimental results are presented to assess how cost (cycle time) and computational time are influenced by the proposed implementation. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

attachment

Supplementary material:
Supplementary File 1 (ZIP, 6932 KiB)

18 pages, 4036 KiB  

Open AccessArticle

Design and Testing of Two Haptic Devices Based on Reconfigurable 2R Joints

by Mykhailo Riabtsev, Victor Petuya, Mónica Urízar and Oscar Altuzarra

Appl. Sci. 2022, 12(1), 339; https://doi.org/10.3390/app12010339 - 30 Dec 2021

Cited by 1 | Viewed by 2283

Abstract

This paper presents the design and testing of two haptic devices, based on reconfigurable 2R joints: an active 2R spherical mechanism-based joint and a differential gear-based joint. Based on our previous works, in which the design and kinematic analysis of both reconfigurable joints [...] Read more.

This paper presents the design and testing of two haptic devices, based on reconfigurable 2R joints: an active 2R spherical mechanism-based joint and a differential gear-based joint. Based on our previous works, in which the design and kinematic analysis of both reconfigurable joints were developed, the experimental setup and the various tasks intended to test the reconfigurability, precision, force feedback system and general performance, are presented herein. Two control modes for the haptic device operation are proposed and studied. The statistical analysis tools and their selection principles are described. The mechanical design of two experimental setups and the main elements are considered in detail. The Robot Operating System nodes and the topics that are used in the software component of the experimental setup are presented and explained. The experimental testing was carried out with a number of participants and the corresponding results were analyzed with the selected statistical tools. A detailed interpretation and discussion on of the results is provided. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

27 pages, 3246 KiB  

Open AccessArticle

A Graph Theory-Based Method for Dynamic Modeling and Parameter Identification of 6-DOF Industrial Robots

by Jun Cheng, Shusheng Bi, Chang Yuan, Lin Chen, Yueri Cai and Yanbin Yao

Appl. Sci. 2021, 11(22), 10988; https://doi.org/10.3390/app112210988 - 19 Nov 2021

Cited by 6 | Viewed by 2745

Abstract

At present, the absolute positioning accuracy and control accuracy of industrial serial robots need to be improved to meet the accuracy requirements of precision manufacturing and precise control. An accurate dynamic model is an important theoretical basis for solving this problem, and precise [...] Read more.

At present, the absolute positioning accuracy and control accuracy of industrial serial robots need to be improved to meet the accuracy requirements of precision manufacturing and precise control. An accurate dynamic model is an important theoretical basis for solving this problem, and precise dynamic parameters are the prerequisite for precise control. The research of dynamics and parameter identification can greatly promote the application of robots in the field of precision manufacturing and automation. In this paper, we study the dynamical modeling and dynamic parameter identification of an industrial robot system with six rotational DOF (6R robot system) and propose a new method for identifying dynamic parameters. Our aim is to provide an accurate mathematical description of the dynamics of the 6R robot and to accurately identify its dynamic parameters. First, we establish an unconstrained dynamic model for the 6R robot system and rewrite it to obtain the dynamic parameter identification model. Second, we establish the constraint equations of the 6R robot system. Finally, we establish the dynamic model of the constrained 6R robot system. Through the ADAMS simulation experiment, we verify the correctness and accuracy of the dynamic model. The experiments prove that the result of parameter identification has extremely high accuracy and the dynamic model can accurately describe the 6R robot system mathematically. The dynamic modeling method proposed in this paper can be used as the theoretical basis for the study of 6R robot system dynamics and the study of dynamics-based control theory. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

32 pages, 4356 KiB  

Open AccessEditor’s ChoiceArticle

Unified Parameterization and Calibration of Serial, Parallel, and Hybrid Manipulators

by Benjamin L. Moser, Joshua A. Gordon and Andrew J. Petruska

Robotics 2021, 10(4), 124; https://doi.org/10.3390/robotics10040124 - 17 Nov 2021

Cited by 7 | Viewed by 4936

Abstract

In this work, we present methods allowing parallel, hybrid, and serial manipulators to be analyzed, calibrated, and controlled with the same analytical tools. We introduce a general approach to describe any robotic manipulator using established serial-link representations. We use this framework to generate [...] Read more.

In this work, we present methods allowing parallel, hybrid, and serial manipulators to be analyzed, calibrated, and controlled with the same analytical tools. We introduce a general approach to describe any robotic manipulator using established serial-link representations. We use this framework to generate analytical kinematic and calibration Jacobians for general manipulator constructions using null space constraints and extend the methods to hybrid manipulator types with complex geometry. We leverage the analytical Jacobians to develop detailed expressions for post-calibration pose uncertainties that are applied to describe the relationship between data set size and post-calibration uncertainty. We demonstrate the calibration of a hybrid manipulator assembled from high precision calibrated industrial components resulting in 91.1 $\mathsf{\mu }$m RMS position error and 71.2 $\mathsf{\mu }$rad RMS rotation error, representing a 46.7% reduction compared to the baseline calibration of assembly offsets. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

23 pages, 14658 KiB  

Open AccessArticle

Design Hybrid Iterative Learning Controller for Directly Driving the Wheels of Mobile Platform against Uncertain Parameters and Initial Errors

by Lijun Qiao, Luo Xiao, Qingsheng Luo, Minghao Li and Jianfeng Jiang

Appl. Sci. 2021, 11(17), 8181; https://doi.org/10.3390/app11178181 - 3 Sep 2021

Viewed by 2039

Abstract

In this paper, we develop a hybrid iterative learning controller (HILC) for a non-holonomic wheeled mobile platform to achieve trajectory tracking with actual complex constraints, such as physical constraints, uncertain parameters, and initial errors. Unlike the traditional iterative learning controller (ILC), the control [...] Read more.

In this paper, we develop a hybrid iterative learning controller (HILC) for a non-holonomic wheeled mobile platform to achieve trajectory tracking with actual complex constraints, such as physical constraints, uncertain parameters, and initial errors. Unlike the traditional iterative learning controller (ILC), the control variable selects the rotation speed of two driving wheels instead of the forward speed and the rotation speed. The hybrid controller considers the physical constraints of the robot’s motors and can effectively handle the uncertain parameters and initial errors of the system. Without the initial errors, the hybrid controller can improve the convergence speed for trajectory tracking by adding other types of error signals; otherwise, the hybrid controller achieves trajectory tracking by designing a signal compensation for the initial errors. Then, the effectiveness of the proposed hybrid controller is proven by the relationship between the input, output, and status signals. Finally, the simulations demonstrate that the proposed hybrid iterative learning controller effectively tracked various trajectories by directly controlling the two driving wheels under various constraints. Furthermore, the results show that the controller did not significantly depend on the system’s structural parameters. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

23 pages, 14955 KiB  

Open AccessArticle

Kinematic Analysis and Verification of a New 5-DOF Parallel Mechanism

by Yesong Wang, Changhuai Lyu and Jiang Liu

Appl. Sci. 2021, 11(17), 8157; https://doi.org/10.3390/app11178157 - 2 Sep 2021

Cited by 11 | Viewed by 3283

Abstract

This paper first designs a new 5-DOF parallel mechanism with 5PUS-UPU, and then analyses its DOF by traditional Grubler–Kutzbach and motion spiral theory. It theoretically shows that the mechanism meets the requirement of five dimensions of freedoms including three-dimensional movement and two-dimensional rotation. [...] Read more.

This paper first designs a new 5-DOF parallel mechanism with 5PUS-UPU, and then analyses its DOF by traditional Grubler–Kutzbach and motion spiral theory. It theoretically shows that the mechanism meets the requirement of five dimensions of freedoms including three-dimensional movement and two-dimensional rotation. Based on this, the real mechanism is built, but unfortunately it is found unstable in some positions. Grassmann line geometry method is applied to analyze its unstable problem caused by singular posture, and then an improving method is put forward to solve it. With the improved mechanism, closed loop vector method is employed to establish the inverse position equation of the parallel mechanism, and kinematics analysis is carried out to get the mapping relationships between position, speed, and acceleration of moving and fixed platform. Monte Carlo method is used to analyze the workspace of the mechanism, to explore the influencing factors of workspace, and then to get the better workspace. Finally, an experiment is designed to verify the mechanism working performance. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

attachment

Supplementary material:
Supplementary File 1 (ZIP, 39823 KiB)

22 pages, 20645 KiB  

Open AccessArticle

Path Planning and Collision Avoidance in Unknown Environments for USVs Based on an Improved D* Lite

by Xiaohui Zhu, Bin Yan and Yong Yue

Appl. Sci. 2021, 11(17), 7863; https://doi.org/10.3390/app11177863 - 26 Aug 2021

Cited by 35 | Viewed by 4464

Abstract

Path planning and collision avoidance during autonomous navigation in unknown environments is a crucial issue for unmanned surface vehicles (USVs). This paper improves the traditional D* Lite algorithm and achieves multi-goal path planning and collision avoidance for USVs in unknown and complex environments. [...] Read more.

Path planning and collision avoidance during autonomous navigation in unknown environments is a crucial issue for unmanned surface vehicles (USVs). This paper improves the traditional D* Lite algorithm and achieves multi-goal path planning and collision avoidance for USVs in unknown and complex environments. By expanding the adjacent search range and setting a safe distance for USVs, we solve the issue of limited steering maneuverability in USVs with fewer DOF during autonomous navigation. We propose an approach to optimize the planned path during navigation by comparing the estimated distance with the actual distance between the current waypoint and the goal waypoint. A minimum binary heap is used to optimize the priority queue of the D* Lite and significantly reduce the path search time. Simulation results show that the improved D * Lite can significantly reduce the path planning time, optimize the planned path and solve the issue of limited steering maneuverability in USVs. We apply the algorithm to a real USV for further tests. Experimental results show that the USV can plan an optimized path while avoiding both static and dynamic obstacles in complex environments with a safe distance during autonomous navigation. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

18 pages, 860 KiB  

Open AccessArticle

Optimization of the 2PRU-1PRS Parallel Manipulator Based on Workspace and Power Consumption Criteria

by Saioa Herrero, Charles Pinto, Mikel Diez and Asier Zubizarreta

Appl. Sci. 2021, 11(17), 7770; https://doi.org/10.3390/app11177770 - 24 Aug 2021

Cited by 4 | Viewed by 2410

Abstract

In the last few years, parallel manipulators are being increasingly studied and used for different applications. The performance of parallel manipulators is very sensitive to the geometric parameters, so it is essential to optimize them in order to obtain the desired function. We [...] Read more.

In the last few years, parallel manipulators are being increasingly studied and used for different applications. The performance of parallel manipulators is very sensitive to the geometric parameters, so it is essential to optimize them in order to obtain the desired function. We propose two optimization algorithms that consider the size and regularity of the workspace. The first one obtains the geometric parameters combination that results in the biggest and most regular workspace. The second method analyzes the geometric parameters combinations that result in an acceptable size of the workspace—even if it is not the biggest one—and finds out which ones result in the lowest power consumption. Even if the results vary depending on the application and trajectories studied, the proposed methodology can be followed to any type of parallel manipulator, application or trajectory. In this work we focus on the dimension optimization of the geometric parameters of the 2PRU-1PRS Multi-Axial Shaking Table (MAST) for automobile pieces testing purposes. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

20 pages, 5361 KiB  

Open AccessArticle

Data Management System for a Semiautonomous Shuttle Car for Underground Room and Pillar Coal Mines

by Vasilis Androulakis, Steven Schafrik, Joseph Sottile and Zach Agioutantis

Automation 2021, 2(3), 153-172; https://doi.org/10.3390/automation2030010 - 13 Aug 2021

Cited by 2 | Viewed by 5036

Abstract

In recent years, autonomous solutions in the multidisciplinary field of mining engineering have been an extremely popular applied research topic. This is a result of the increasing demands of society on mineral resources along with the accelerating exploitation of the currently economically viable [...] Read more.

In recent years, autonomous solutions in the multidisciplinary field of mining engineering have been an extremely popular applied research topic. This is a result of the increasing demands of society on mineral resources along with the accelerating exploitation of the currently economically viable resources, which lead the mining sector to turn to deeper, more-difficult-to-mine orebodies. An appropriate data management system comprises a crucial aspect of the designing and the engineering of a system that involves autonomous or semiautonomous vehicles. The vast volume of data collected from onboard sensors, as well as from a potential IoT network dispersed around a smart mine, necessitates the development of a reliable data management strategy. Ideally, this strategy will allow for fast and asynchronous access to the data for real-time processing and decision-making purposes as well as for visualization through a corresponding human–machine interface. The proposed system has been developed for autonomous navigation of a coalmine shuttle car and has been implemented on a 1/6th scale shuttle car in a mock mine. It comprises three separate nodes, namely, a data collection node, a data management node, and a data processing and visualization node. This approach was dictated by the large amount of collected data and the need to ensure uninterrupted and fast data management and flow. The implementation of an SQL database server allows for asynchronous, real-time, and reliable data management, including data storage and retrieval. On the other hand, this approach introduces latencies between the data management node and the other two nodes. In general, these latencies include sensor latencies, network latencies, and processing latencies. However, the data processing and visualization module is able to retrieve and process the latest data and make a decision about the next optimal movement of the shuttle car prototype in less than 900 ms. This allows the prototype to navigate efficiently around the pillars without interruptions. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

18 pages, 6180 KiB  

Open AccessArticle

Robotic Assembly for Irregular Shaped Peg-in-Hole with Partial Constraints

by Wei Li, Hongtai Cheng, Chengpeng Li and Xiaohua Zhang

Appl. Sci. 2021, 11(16), 7394; https://doi.org/10.3390/app11167394 - 11 Aug 2021

Cited by 4 | Viewed by 3514

Abstract

The tight tolerance peg-in-hole process brings great challenges for robotic assembly. Force control-based methods have been proposed to generate complex compliant behavior to deal with the shape and clearance variances. However, existing solutions are based on the assumption that the peg and hole [...] Read more.

The tight tolerance peg-in-hole process brings great challenges for robotic assembly. Force control-based methods have been proposed to generate complex compliant behavior to deal with the shape and clearance variances. However, existing solutions are based on the assumption that the peg and hole parts are fixed during the assembly process and can absorb the contact force completely. For this purpose, customized fixtures have to be designed and utilized, which greatly affect the system’s deployment cost, time, and flexibility. Considering the fact that in an assembly, the parts are naturally related to each other, this paper studies the irregular-shaped peg-in-hole assembly problem with partial constraints. Firstly, geometric and force model are developed for the natural constraints between the parts; by analyzing the behavior of the partial constraint, a control policy is proposed to compensate the position errors and drive the parts to a stable equilibrium point; For the irregular-shaped parts, a multiple-stage searching method is developed to efficiently search for the real hole location; Finally, a switching force/position hybrid controller is designed to coordinate the alignment, searching and insertion processes. The method is implemented in a real platform. The experiment results verify the effectiveness of the proposed methods. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

19 pages, 3117 KiB  

Open AccessArticle

A Novel Hybrid Path Planning Method Based on Q-Learning and Neural Network for Robot Arm

by Ali Abdi, Dibash Adhikari and Ju Hong Park

Appl. Sci. 2021, 11(15), 6770; https://doi.org/10.3390/app11156770 - 23 Jul 2021

Cited by 25 | Viewed by 4878

Abstract

Path planning for robot arms to reach a target and avoid obstacles has had a crucial role in manufacturing automation. Although many path planning algorithms, including RRT, APF, PRM, and RL-based, have been presented, they have many problems: a time-consuming process, high computational [...] Read more.

Path planning for robot arms to reach a target and avoid obstacles has had a crucial role in manufacturing automation. Although many path planning algorithms, including RRT, APF, PRM, and RL-based, have been presented, they have many problems: a time-consuming process, high computational costs, slowness, non-optimal paths, irregular paths, failure to find a path, and complexity. Scholars have tried to address some of these issues. However, those methods still suffer from slowness and complexity. In order to address these two limitations, this paper presents a new hybrid path planning method that contains two separate parts: action-finding (active approach) and angle-finding (passive approach). In the active phase, the Q-learning algorithm is used to find a sequence of simple actions, including up, down, left, and right, to reach the target cell in a gridded workspace. In the passive phase, the joints angles of the robot arm, with respect to the found actions, are obtained by the trained neural network. The simulation and test results show that this hybrid approach significantly improves the slowness and complexity due to using the simplified agent-environment interaction in the active phase and simple computing the joints angles in the passive phase. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

20 pages, 9326 KiB  

Open AccessArticle

Effects of Temperature and Mounting Configuration on the Dynamic Parameters Identification of Industrial Robots

by Andrea Raviola, Roberto Guida, Andrea De Martin, Stefano Pastorelli, Stefano Mauro and Massimo Sorli

Robotics 2021, 10(3), 83; https://doi.org/10.3390/robotics10030083 - 29 Jun 2021

Cited by 25 | Viewed by 6043

Abstract

Dynamic parameters are crucial for the definition of high-fidelity models of industrial manipulators. However, since they are often partially unknown, a mathematical model able to identify them is discussed and validated with the UR3 and the UR5 collaborative robots from Universal Robots. According [...] Read more.

Dynamic parameters are crucial for the definition of high-fidelity models of industrial manipulators. However, since they are often partially unknown, a mathematical model able to identify them is discussed and validated with the UR3 and the UR5 collaborative robots from Universal Robots. According to the acquired experimental data, this procedure allows for reducing the error on the estimated joint torques of about 90% with respect to the one obtained using only the information provided by the manufacturer. The present research also highlights how changes in the robot operating conditions affect its dynamic behavior. In particular, the identification process has been applied to a data set obtained commanding the same trajectory multiple times to both robots under rising joints temperatures. Average reductions of the viscous friction coefficients of about 20% and 17% for the UR3 and the UR5 robots, respectively, have been observed. Moreover, it is shown how the manipulator mounting configuration affects the number of the base dynamic parameters necessary to properly estimate the robots’ joints torques. The ability of the proposed model to take into account different mounting configurations is then verified by performing the identification procedure on a data set generated through a digital twin of a UR5 robot mounted on the ceiling. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

16 pages, 2713 KiB  

Open AccessArticle

Sliding Mode Control with Sliding Perturbation Observer-Based Strategy for Reducing Scratch Formation in Hot Rolling Process

by Hyun-Hee Kim, Sung-Jin Kim, Sung-Min Yoon, Yong-Joon Choi and Min-Cheol Lee

Appl. Sci. 2021, 11(12), 5526; https://doi.org/10.3390/app11125526 - 15 Jun 2021

Cited by 3 | Viewed by 2480

Abstract

In a hot rolling process, excessive friction between rollers and steel plates may lead to the formation of scratches on the steel plate. To reduce scratch formation in the finishing mill of the hot rolling process, two techniques are proposed in this work: [...] Read more.

In a hot rolling process, excessive friction between rollers and steel plates may lead to the formation of scratches on the steel plate. To reduce scratch formation in the finishing mill of the hot rolling process, two techniques are proposed in this work: flying touch and velocity synchronization. The proposed flying touch method can reduce the impact of the generated force when the upper roller collides with the steel plate. In addition, the proposed velocity synchronization method can decrease the frictional force resulting from the velocity difference between the rollers and steel plate. The effectiveness of the proposed methods was demonstrated through simulations and experiments using a 1/40 downscaled hot rolling simulator. The simulations and experimental results demonstrate that the proposed methods can reduce the magnitudes of friction and impact forces that lead to scratch formation on the steel plates in the hot rolling process. Full article

(This article belongs to the Topic Industrial Robotics)

►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less

Select all

Export citation of selected articles as:

Plain Text BibTeX BibTeX (without abstracts) Endnote Endnote (without abstracts) Tab-delimited RIS

 

Error

Oops... you haven't selected anything for export.

Ok

clear

Displaying articles 1-24