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Applied Sciences
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Dynamics and Vibrations of Nonlinear Systems with Applications
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Dynamics and Vibrations of Nonlinear Systems with Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: 28 February 2025 | Viewed by 2353

Special Issue Editors

Prof. Dr. Nicolae-Doru Stănescu

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Guest Editor
Department of Manufacturing and Industrial Management, Faculty of Mechanics and Technology, National University of Science and Technology Politehnica Bucharest, Pitesti University Center, 110040 Pitești, Romania
Interests: mechanics of systems; non-linear vibrations; dynamical systems; stability; chaos; numerical analysis
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Nicolae Pandrea

E-Mail Website
Guest Editor
Department of Manufacturing and Industrial Management, Faculty of Mechanics and Technology, National University of Science and Technology Politehnica Bucharest, Pitesti University Center, 110040 Pitești, Romania
Interests: nonlinear dynamics; nonlinear vibrations; complex systems
Prof. Dr. Polidor-Paul Bratu

E-Mail Website
Guest Editor
1. Institute of Solid Mechanics, Romanian Academy, Bucharest, Romania
2. Research Institute for Construction Equipment and Technology—ICECON SA, 021652 Bucharest, Romania
Interests: nonlinear dynamics; nonlinear vibrations; stability
Dr. Veturia Chiroiu

E-Mail Website
Guest Editor
Department of Deformable Media & Ultrasonics, Institute of Solid Mechanics of the Romanian Academy, 010141 Bucharest, Romania
Interests: dynamics; biomechanics; optimization; complex structures; numerical methods
Dr. Ligia Munteanu

E-Mail Website
Guest Editor
Department of Deformable Media & Ultrasonics, Institute of Solid Mechanics of the Romanian Academy, 010141 Bucharest, Romania
Interests: nonlinear dynamics; biomechanics; optimization; complex structures; numerical methods

Special Issue Information

Dear Colleagues,

This Special Issue is dedicated to studies and research in the field of nonlinear dynamics and vibrations, taking into account the following: a) Non-linear vibrations and non-linear systems are the most common in nature, and linear ones are just a special case of the former; b) The solutions of nonlinear systems are bounded or not, periodic or not, or even chaotic; c) Non-linearities can originate from the expressions of masses, elastic constants, frictions, exciting forces, and their combinations or they can be systems where some of them differ on certain portions; d) The solutions are provided in analytical or numerical form (the most common situation).

Papers must focus on the following research areas:

  • Systems with nonlinear behavior;
  • The control of nonlinear dynamics and vibrations;
  • Methods to study the nonlinear systems;
  • Chaotic motions;
  • The solutions of nonlinear vibrations;
  • Nonlinear vibrations transmitted to structures;
  • The isolation of nonlinear vibrations;
  • Comfort;
  • Bounded and periodic dynamics.

Prof. Dr. Nicolae-Doru Stănescu
Prof. Dr. Nicolae Pandrea
Prof. Dr. Polidor-Paul Bratu
Dr. Veturia Chiroiu
Dr. Ligia Munteanu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nonlinearity
  • periodic solution
  • bounded solution
  • chaos
  • analytical and numerical solution
  • control

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Published Papers (2 papers)

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Research

18 pages, 4986 KiB  
Article
On the Accuracy of Turbulence Model Simulations of the Exhaust Manifold
by Ouyoussef Nouhaila, Moustabchir Hassane, Maria Luminita Scutaru and Liviu Jelenschi
Appl. Sci. 2024, 14(12), 5262; https://doi.org/10.3390/app14125262 - 18 Jun 2024
Cited by 1 | Viewed by 866
Abstract
This study investigating the accuracy of turbulence model simulations of the exhaust manifold using computational fluid dynamics (CFD) carries significant implications. By modeling and analyzing the flow of emissions, we aim to identify areas of high stress and pressure, minimize the pressure drop, [...] Read more.
This study investigating the accuracy of turbulence model simulations of the exhaust manifold using computational fluid dynamics (CFD) carries significant implications. By modeling and analyzing the flow of emissions, we aim to identify areas of high stress and pressure, minimize the pressure drop, and maximize the flow of exhaust gases. This not only enhances engine performance, reduces emissions, and improves the durability of the manifold but also provides a unique opportunity to predict and analyze the flow and performance of the exhaust manifold, both quantitatively and qualitatively. This paper aims to provide a detailed comparison of five turbulence models that are commonly used in CFD to offer valuable insights into their accuracy and reliability in predicting the flow characteristics of exhaust gases. The results show that the k-kl-ω model showed the highest maximum velocity and the most comprehensive temperature range, efficiently capturing the transitional flow effects. The K-ω STD and SST transition models displayed significantly higher turbulent kinetic energy (TKE) values, indicating their enhanced effectiveness in modeling complex turbulent and transitional flows. Conversely, the Reynolds stress and RNG k-epsilon models displayed lower TKE values, suggesting more subdued turbulence predictions. Despite this, all models exhibited similar pressure drop trends, with a noticeable increase near the midpoint of the manifold. These quantitative findings provide valuable insights into the suitability of different turbulence models for optimizing exhaust manifold design. Full article
(This article belongs to the Special Issue Dynamics and Vibrations of Nonlinear Systems with Applications)
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21 pages, 10349 KiB  
Article
Research on the Dynamic Characteristics of a Dual Linear-Motor Differential-Drive Micro-Feed Servo System
by Hanwen Yu, Guiyuan Zheng, Yandong Liu, Jiajia Zhao, Guozhao Wei and Hongkui Jiang
Appl. Sci. 2024, 14(8), 3170; https://doi.org/10.3390/app14083170 - 10 Apr 2024
Cited by 1 | Viewed by 951
Abstract
(1) Objectives: This article presents a dual linear-motor differential drive micro-feed servo system, mainly through the optimization design of the transmission mechanism. Owing to the differential synthesis of the micro feed from the upper and under linear motors, the impact of friction nonlinearity [...] Read more.
(1) Objectives: This article presents a dual linear-motor differential drive micro-feed servo system, mainly through the optimization design of the transmission mechanism. Owing to the differential synthesis of the micro feed from the upper and under linear motors, the impact of friction nonlinearity during the ultra-low velocity micro feed is avoided, endowing the system with a lower stable feed speed to achieve precise micro-feed control. (2) Methods: Transmission components of the dual linear-motor differential-drive system are analyzed using the lumped parameter method, and a dynamic model of electromechanical coupling is created, which takes into account nonlinear friction. The motion relationship of the dual linear-motor differential-drive servo feed system is characterized using a transfer function block diagram. (3) Discussions: Through simulation, the differences in response between the linear-motor single-drive system and the dual linear-motor differential-drive system are examined under fixed or variable feeding velocities as well as the impact of varying velocity combinations of dual linear motors on the output speed of the differential drive system. (4) Results: Nonlinear friction factors exert an impact on the feed velocity of both linear-motor single-drive and dual linear-motor differential-drive systems during low-velocity micro feed. However, regardless of the constant or variable speed conditions, the dual linear-motor differential-drive servo system significantly outperforms the linear-motor single-drive system regarding low-velocity micro feed. Our simulation results are basically consistent with engineering practice, thus validating the rationality of the created system models, which paves the ground for the micro-feed control algorithms. Full article
(This article belongs to the Special Issue Dynamics and Vibrations of Nonlinear Systems with Applications)
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