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Actuators
Special Issues
Nonlinear Active Vibration Control
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Nonlinear Active Vibration Control

A special issue of Actuators (ISSN 2076-0825). This special issue belongs to the section "Control Systems".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 4248

Special Issue Editors

Dr. Zeqi Lu

E-Mail Website
Guest Editor
School of Mechanics and Engineering Sciences, Shanghai University, Shanghai, China
Interests: passive and active vibration control; nonlinear vibration; vibration isolation; dynamic absorption; energy harvesting; nonlinear energy sink
Prof. Dr. Hailing Fu

E-Mail Website
Guest Editor
School of Automation, Beijing Institute of Technology, Beijing 100811, China
Interests: smart wearable systems and control; smart multi-agent systems; autonomous sensor networks
Special Issues, Collections and Topics in MDPI journals
Dr. Nan Wu

E-Mail Website
Guest Editor
Department of Mechanical Engineering, The University of Manitoba, Winnipeg, MB R3T 5V6, Canada
Interests: solid mechanics; mechanical vibration; smart materials and structures; energy harvesting; structural health monitoring
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Vibration control can be significant in the optoelectronic performance of sophisticated engineering structures or machines, as it helps in establishing high stability, high pointing accuracy, and high positioning accuracy. The active control of vibration in mechanical systems is an essential and inseparable approach to micro- or nanovibration suppression research. The conventional actuators have an inherently lower limit operating frequency of 5 Hz. When the frequency is close to the lower limit, the dynamic characteristics of the actuator are greatly degraded, and the actuating force required for low-frequency vibration is often greater, resulting in the low efficiency of the vibration control within the 5-10 Hz frequency band. Active vibration control has limited solutions for a vibration below 5 Hz. For active vibration control, the vibration control lower than 5 Hz is named ultra-low-frequency active vibration control. Ultra-low-frequency vibration is very common in sophisticated engineering structures and machines. To improve the actuation efficiency, a nonlinear structure can be applied instead of a linear spring as an effective solution. Nonlinear vibration control is expected to overcome the shortcomings of traditional linear vibration control, such as low efficiency and high cost, and realize more efficient vibration suppression, which is of great engineering significance.

The Special Issue aims to collect research articles on the usage of nonlinearity to improve the performance of active vibration control. We are pleased to invite the research community to submit review or regular research papers on, but not limited to, the following relevant topics related to “Nonlinear Active Vibration Control”:

  • Nonlinear vibration theory, dynamic modelling, and analysis methods;
  • Electromechanical conversion mechanisms and smart materials;
  • Passive vibration control approach: isolation, absorption, and damping;
  • Piezoelectric/electromagnetic actuators and systems;
  • Active metamaterials for vibration control;
  • Integrated active and passive vibration control.

Dr. Zeqi Lu
Prof. Dr. Hailing Fu
Dr. Nan Wu
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. Actuators is an international peer-reviewed open access monthly 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

  • active vibration control
  • nonlinear vibration
  • vibration isolation
  • vibration absorption
  • electromagnetic actuator
  • piezoelectric actuator
  • active control algorithms

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Published Papers (2 papers)

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Research

18 pages, 7199 KiB  
Article
Study on Dynamics of Overrunning Spring Clutches and Suppression Methods for Their Abnormal Noise
by Jie Zhou, Zhehang Qiu, Huijuan Zhang and Jianming Zhan
Actuators 2024, 13(5), 165; https://doi.org/10.3390/act13050165 - 1 May 2024
Cited by 1 | Viewed by 1004
Abstract
Overrunning spring clutches are widely used as essential transmission devices, and the occurrence of abnormal noise can lead to a decline in their performance. This study investigates the dynamic aspects of abnormal noise in engineering applications, including its causes, influencing factors, and suppression [...] Read more.
Overrunning spring clutches are widely used as essential transmission devices, and the occurrence of abnormal noise can lead to a decline in their performance. This study investigates the dynamic aspects of abnormal noise in engineering applications, including its causes, influencing factors, and suppression methods. Audio processing algorithms are employed to analyze the audio associated with abnormal noise, and the Fourier Motion Blur algorithm is applied to process video images of the springs. By combining the motion blur curve with the noise spectrum curve, the source of the abnormal noise is identified as friction-induced vibrations in the spring. Theoretical modeling and calculations are carried out from a dynamic perspective to validate that the phenomenon of abnormal noise in the clutch is a result of self-excited friction vibration caused by the stick–slip phenomenon. Based on theoretical analysis and practical engineering, surface texturing is added to the center shaft of the spring seat, optimizing the system as an overdamped system to suppress self-vibration. Utilizing CFD simulation analysis, the simulation results are used to improve the texturing parameters and further optimize the texturing shape, resulting in an optimal parallelogram surface texture structure. Experimental validation confirms that the improved overrunning spring clutch completely eliminates abnormal noise during overrunning operation. Therefore, this paper contributes to the understanding of the dynamic issues associated with abnormal noise in overrunning spring clutches, confirming that the mechanism for abnormal noise generation is friction-induced self-excitation vibration, and demonstrating that surface texture optimization methods effectively suppress the occurrence of abnormal noise. Full article
(This article belongs to the Special Issue Nonlinear Active Vibration Control)
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18 pages, 5930 KiB  
Communication
Negative-Stiffness Structure Vibration-Isolation Design and Impedance Control for a Lower Limb Exoskeleton Robot
by Yaohui Sun, Jiangping Hu and Rui Huang
Actuators 2023, 12(4), 147; https://doi.org/10.3390/act12040147 - 30 Mar 2023
Cited by 7 | Viewed by 2214
Abstract
The series elastic actuator (SEA) is generally used as the torque source of the exoskeleton robot for human–robot interaction (HRI). In this paper, an impedance control method for lower limb exoskeleton robots driven by SEA is presented. First, considering the low-frequency vibrations generated [...] Read more.
The series elastic actuator (SEA) is generally used as the torque source of the exoskeleton robot for human–robot interaction (HRI). In this paper, an impedance control method for lower limb exoskeleton robots driven by SEA is presented. First, considering the low-frequency vibrations generated by the lower limb exoskeleton robot during walking, the displacement generated by the robot is regarded as an external disturbance to the SEA motor. An SEA structure with negative stiffness structure (NSS) is designed to achieve vibration isolation in the low-frequency excitation region. Second, the dynamics model of the SEA-driven exoskeleton robot system is proposed, and the impedance control strategy is integrated into the proposed system. In addition, the numerical responses of the vibration-isolation system in both time and frequency domains are given, and the designed NSS is designed to achieve vibration isolation. The amplitude-frequency responses of the system are obtained. The harmonic balance (HB) method is used to give the analytical solution of the designed negative-stiffness isolation system, and the effects of different characteristic parameters on the isolation system are analyzed. Moreover, the stability of the SEA-driven exoskeleton impedance control system is demonstrated using the Lyapunov method. Finally, numerical simulations are carried out in order to show the effectiveness of the control method. Full article
(This article belongs to the Special Issue Nonlinear Active Vibration Control)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Type of Paper： Article
Tentative Title: Slewing and active vibration control of a flexible single-link manipulator.. 
Authors: Dae W. Kim, Soo-Min Kim, Moon K. Kwak, B. Feeny
Affiliations: Dongguk University and Michigan State University
Abstract: This study deals with the slewing and vibration suppression of flexible single-link manipulators. Although many studies have been conducted on flexible single-link manipulators, there are no cases in which experiments have proven the validity of the theoretical model. In this study, to verify the validity of the theoretical study, an experimental device was created that connected the flexible link to the zero-backlash worm gear and connected it to the rotor shaft of the AC servo motor. Due to the nature of the worm gear, the vibration of the link cannot affect the angular movement of the rotor, so the vibration controller can be designed separately from the slewing control. In this study, both dynamic modeling, slewing control, and vibration control for such a system were dealt with, and the validity of the theoretical model and the response calculation result using the theoretical model was compared with the response obtained through the experiment to prove the validity of the vibration control algorithm.
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