Soft Robotics: Materials, Systems and Operations

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E:Engineering and Technology".

Deadline for manuscript submissions: closed (20 June 2021) | Viewed by 11177

Special Issue Editor

Department of Material Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea
Interests: Adaptive/programmable matter; Soft-robotics; Human-machine interface; Nano-bio interfaces; Electrocueticals

Special Issue Information

Dear Colleagues,

Soft robotics is a subfield of robotics dealing with designing and constructing robots with physically flexible bodies and control systems. These soft machines have tremendous potential in the field of medical devices, wearable platforms, robots working in unstructured environments, and manufacturing, as they have increased compliance and adaptability for doing unconventional tasks and improved safety when working with humans. Living things are mostly composed of soft components and have clever morphology to exploit their softness and smartness for efficient behaviors in complex environments. Thus, successful designs of soft robots require the design of clever morphology and the intelligent embodiment of functional materials and components into the soft systems, which results in the dynamic interaction with environment.

This field aims to create soft-bodied robotic systems or smart components at all scales to achieve behavioral and functional sophistication, similar to those found in living organisms. However, their flexibility makes them difficult to control as they have low mechanical impedance and consequently the tools to design rigid bodied systems usually fails to analyze the behavior of soft bodies. Thus, this field also requires novel operational algorithms, design methodology, and optimization for a given task, in addition to developing material, structure and system.

Thus, this call for papers by Micromachines for this Special Issue, “Soft Robotics: Materials, Systems and Operations” embraces all topics regarding soft and smart materials, hierarchical designs of nano/microstructures or surfaces, soft electronics/actuators/sensors, manufacturing, bio-hybrid robots, micro-scale robots, operations, design methodologies, applications, etc. Advanced studies on any topics related to soft components that can be embedded in soft robotic systems are encouraged for submission. We look forward to receiving your contribution.

Dr. Jiyun Kim
Guest Editor

Manuscript Submission Information

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Keywords

  • soft robotics
  • smart materials
  • soft sensors and actuators
  • biomimetics
  • micro-scale robotics
  • soft body design and operation

Published Papers (2 papers)

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Research

18 pages, 1891 KiB  
Article
A Time Division Multiplexing Inspired Lightweight Soft Exoskeleton for Hip and Ankle Joint Assistance
by Xin Ye, Chunjie Chen, Yanguo Shi, Lingxing Chen, Zhuo Wang, Zhewen Zhang, Yida Liu and Xinyu Wu
Micromachines 2021, 12(10), 1150; https://doi.org/10.3390/mi12101150 - 24 Sep 2021
Cited by 8 | Viewed by 3036
Abstract
Exoskeleton robots are frequently applied to augment or assist the user’s natural motion. Generally, each assisted joint corresponds to at least one specific motor to ensure the independence of movement between joints. This means that as there are more joints to be assisted, [...] Read more.
Exoskeleton robots are frequently applied to augment or assist the user’s natural motion. Generally, each assisted joint corresponds to at least one specific motor to ensure the independence of movement between joints. This means that as there are more joints to be assisted, more motors are required, resulting in increasing robot weight, decreasing motor utilization, and weakening exoskeleton robot assistance efficiency. To solve this problem, the design and control of a lightweight soft exoskeleton that assists hip-plantar flexion of both legs in different phases during a gait cycle with only one motor is presented in this paper. Inspired by time-division multiplexing and the symmetry of walking motion, an actuation scheme that uses different time-periods of the same motor to transfer different forces to different joints is formulated. An automatic winding device is designed to dynamically change the loading path of the assistive force at different phases of the gait cycle. The system is designed to assist hip flexion and plantar flexion of both legs with only one motor, since there is no overlap between the hip flexion movement and the toe-offs movement of the separate legs during walking. The weight of the whole system is only 2.24 kg. PD iterative control is accomplished by an algorithm that utilizes IMUs attached on the thigh recognizing the maximum hip extension angle to characterize toe-offs indirectly, and two load cells to monitor the cable tension. In the study of six subjects, muscle fatigue of the rectus femoris, vastus lateralis, gastrocnemius and soleus decreased by an average of 14.69%, 6.66%, 17.71%, and 8.15%, respectively, compared to scenarios without an exoskeleton. Full article
(This article belongs to the Special Issue Soft Robotics: Materials, Systems and Operations)
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14 pages, 4661 KiB  
Article
A 3D-Printed Fin Ray Effect Inspired Soft Robotic Gripper with Force Feedback
by Yang Yang, Kaixiang Jin, Honghui Zhu, Gongfei Song, Haojian Lu and Long Kang
Micromachines 2021, 12(10), 1141; https://doi.org/10.3390/mi12101141 - 23 Sep 2021
Cited by 26 | Viewed by 7501
Abstract
Soft robotic grippers are able to carry out many tasks that traditional rigid-bodied grippers cannot perform but often have many limitations in terms of control and feedback. In this study, a Fin Ray effect inspired soft robotic gripper is proposed with its whole [...] Read more.
Soft robotic grippers are able to carry out many tasks that traditional rigid-bodied grippers cannot perform but often have many limitations in terms of control and feedback. In this study, a Fin Ray effect inspired soft robotic gripper is proposed with its whole body directly 3D printed using soft material without the need of assembly. As a result, the soft gripper has a light weight, simple structure, is enabled with high compliance and conformability, and is able to grasp objects with arbitrary geometry. A force sensor is embedded in the inner side of the gripper, which allows the contact force required to grip the object to be measured in order to guarantee successful grasping and to provide the most suitable gripping force. In addition, it enables control and data monitoring of the gripper’s operating state at all times. Characterization and grasping demonstration of the gripper are given in the Experiment section. Results show that the gripper can be used in a wide range of scenarios and applications, such as the service robot and food industry. Full article
(This article belongs to the Special Issue Soft Robotics: Materials, Systems and Operations)
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