CHAPTER 13. Semi-Active Isolation System Using Self-Powered Magnetorheological Dampers

This study addresses experimental evaluation of a semi-active vibration isolation system using a self-powered magnetorheological (MR) damper. To this end, a self-powered MR damper was constructed by electronically connecting an MR damper with a power harvesting dynamic vibration absorber (DVA) that can convert mechanical energy due to vibration and shock into electrical energy by means of electromagnetic induction. In this study, an MR damper for seat suspensions of the Expeditionary Fighting Vehicle (EFV) was chosen for the application of the self-powered MR damper. The generated voltage, current, and power of the power harvesting DVA were experimentally measured in frequency domain under various acceleration levels of 0.3–1.2 g (where one g = 9.81 m/s2). In addition, damper force testing of the self-powered MR damper (i.e., in this study, a prototype EFV MR damper with the power harvesting DVA) was experimentally conducted in time and frequency domains. To evaluate vibration isolation performance of a semi-active isolation system using the self-powered MR damper, an EFV seat suspension mockup using the self-powered MR damper was constructed. Under eight different representative random excitation accelerations, the vibration isolation performance of the EFV seat suspension mockup using the self-powered MR damper was experimentally evaluated.

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Self-powered magnetorheological dampers for motorcycle suspensions

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407017723761 ◽

2017 ◽

Vol 232 (7) ◽

pp. 921-935 ◽

Cited By ~ 4

Author(s):

Chao Chen ◽

Yu Shing Chan ◽

Li Zou ◽

Wei-Hsin Liao

Keyword(s):

Laboratory Testing ◽

Ride Comfort ◽

Mechanical Energy ◽

The Self ◽

Magnetorheological Damper ◽

System Level ◽

Magnetorheological Dampers ◽

Suspension Systems ◽

Magnetorheological Suspension ◽

Self Powered

Dampers are the parts of suspensions which improve the ride comfort and the safety of vehicles including motorcycles. Magnetorheological dampers are very attractive for motorcycle suspensions, because of their controllable properties and their fast responses. Considerable energy is wasted owing to the energy dissipation by dampers encountering road irregularities and accelerating processes during everyday use of motorcycles. In addition, the current magnetorheological suspension systems depend on the power supply of batteries. Therefore, in this paper, a self-powered magnetorheological damper for motorcycle suspensions is proposed and implemented for the first time. It can convert the wasted mechanical energy into useful electrical energy to power itself. There are great merits in this such as energy saving, independence of extra batteries and less maintenance in comparison with conventional magnetorheological suspension systems, while keeping controllable performances. A customized prototype of the self-powered magnetorheological damper that is compatible with a motorcycle is developed and actually implemented in a motorcycle. Modelling for the self-powered magnetorheological damper is developed and validated by laboratory testing. Laboratory testing showed that the self-powered feature works well to generate the electrical power and to vary the magnetorheological damping force. Preliminary system-level testing showed that a self-powered magnetorheological suspension results in a better ride comfort, compared with that of a magnetorheological suspension without power generation. The results showed that implementing self-powered magnetorheological dampers in motorcycle suspensions is feasible and beneficial.

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Study of Active Isolation System with Feedforward Control.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C ◽

10.1299/kikaic.58.2381 ◽

1992 ◽

Vol 58 (552) ◽

pp. 2381-2387 ◽

Cited By ~ 4

Author(s):

Masashi YASUDA ◽

Takahide OSAKA ◽

Masao IKEDA

Keyword(s):

Feedforward Control ◽

Isolation System ◽

Active Isolation

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Dynamic Analysis of an Active Flexible Isolation System

Volume 5: 19th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2003/vib-48544 ◽

2003 ◽

Author(s):

Kongjie Song ◽

Lingling Sun ◽

Yuguo Sun ◽

Bing Zhang

Keyword(s):

Active Control ◽

Power Flow ◽

Low Frequency ◽

Coupled System ◽

Isolation System ◽

Active Isolation ◽

Dynamic Modification ◽

Mobility Method ◽

Feed Forward Controller ◽

Flexible Foundation

This paper is dedicated to the structure dynamic modification in an active isolation system supported by a flexible foundation, in order to improve the effectiveness of the active control strategy. The coupled vibration between machine-sprung and flexible foundation substructure is examined, using the subsystem mobility method. The vibration transmission in this coupled system is presented in terms of power flow. The interaction between structure controlled and the adaptive feed-forward controller is investigated theoretically. The numerical results show that: the location of the active mounts and the first mode frequency of the flexible foundation have evident influence on the effect of active control, especially at low-frequency band.

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Effects of Damper Force Ranges and Ground Motion Pulse Periods on the Performance of Semi-Active Isolation Systems

Problems Involving Thermal Hydraulics, Liquid Sloshing, and Extreme Loads on Structures ◽

10.1115/pvp2003-1819 ◽

2003 ◽

Cited By ~ 1

Author(s):

Henri Gavin ◽

Julie Thurston ◽

Chicahiro Minowa ◽

Hideo Fujitani

Keyword(s):

Ground Motion ◽

Large Scale ◽

Base Isolation ◽

Near Field ◽

Shaking Table ◽

Isolation System ◽

Active Isolation ◽

Isolation Systems ◽

Fail Safe ◽

Strong Ground

A large-scale base-isolated steel structural frame was tested at the shaking table laboratory of the National Research Institute for Earth Sciences and Disaster Prevention. These collaborative experiments featured auto-adaptive media and devices to enhance the performance of passive base isolation systems. The planning of these experiments involved determining appropriate device control methods, the development of a controllable damping device with fail-safe characteristics, and the evaluation of the performance of the controlled isolation system subjected to strong ground motion with pronounced near-field effects. The results of the planning study and their large-scale experimental confirmation provide guidelines for the development and implementation of auto-adaptive damping devices for full scale structures.

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Study on Super-Long-Period Active Isolation System Considering Relatively Long Period Seismic Wave

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2004.5.0_269 ◽

2004 ◽

Vol 2004.5 (0) ◽

pp. 269-270

Author(s):

Tomo Sasaki ◽

Satoshi Fujita ◽

Minagawa Keisuke ◽

Takafumi Fujita ◽

osamu Takahashi

Keyword(s):

Seismic Wave ◽

Isolation System ◽

Long Period ◽

Active Isolation

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3A33 Development of an active isolation system using the reference mass of a two DOF system(The 12th International Conference on Motion and Vibration Control)

The Proceedings of the Symposium on the Motion and Vibration Control ◽

10.1299/jsmemovic.2014.12._3a33-1_ ◽

2014 ◽

Vol 2014.12 (0) ◽

pp. _3A33-1_-_3A33-8_

Author(s):

Ryo NAWATA ◽

Katsumi ASADA ◽

Wataru TAMURA ◽

Naoki MARUYAMA

Keyword(s):

Vibration Control ◽

Isolation System ◽

International Conference ◽

Active Isolation

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A Study of Active Vibration Isolation

Journal of Vibration and Acoustics ◽

10.1115/1.3269278 ◽

1985 ◽

Vol 107 (4) ◽

pp. 392-397 ◽

Cited By ~ 6

Author(s):

N. Tanaka ◽

Y. Kikushima

Keyword(s):

Vibration Isolation ◽

Control Method ◽

Feedforward Control ◽

Ground Vibration ◽

Design Parameters ◽

Isolation Method ◽

Isolation System ◽

Active Isolation ◽

Active Vibration ◽

Active Vibration Isolation

For the purpose of suppressing ground vibration produced by vibrating machines, such as forging hammers, press machines, etc., this paper presents an active vibration isolation method. Unlike conventional isolators, the active isolator proposed in this paper permits rigid support of the machines. First, the principle of the active isolation method is shown, and the system equations are derived. Secondly, the characteristics and the design parameters of the active isolation system are presented. Thirdly, from the point of view of the feedforward control method, the dynamic compensators are designed so as to sufficiently suppress the exciting force. Finally, an experiment is carried out to demonstrate that the active isolator is applicable for suppressing the ground vibration.

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Sliding-Mode Control Algorithm for a Hard-Mounted Isolation System

Volume 9: Mechanical Systems and Control, Parts A, B, and C ◽

10.1115/imece2007-43207 ◽

2007 ◽

Author(s):

Yung-Peng Wang ◽

Jen-Chieh Tsao

Keyword(s):

Sliding Mode Control ◽

Control Algorithm ◽

Sliding Mode ◽

Isolation System ◽

Mode Control ◽

Active Isolation ◽

Ultra Precision ◽

Passive Isolation ◽

Isolation Systems ◽

Isolation Performance

It is well known that the trend of current technology development is microscopic and ultra-precision, especially in the areas of semiconductor manufacturing, ultra-precision machining, MEMS, microbiology and nanotechnology. Hence, vibration becomes a significant problem in those fields. There are two types of vibration control techniques. One is passive isolation system; the other is active isolation system. Passive isolation system can provide better performance for higher frequencies. Active isolation system is used to improve the isolation performance for lower frequencies. However, passive isolation system has bad performance around the natural frequency. In addition, it cannot eliminate the effects of onboard disturbances. Therefore, active isolation system becomes the major technology in the applications of microvibration control for precision equipment. In practice, all active isolation systems are based upon a hybrid concept, combining a passive isolator for higher frequencies and a servo control system for lower frequencies. This combination allows for two significantly different configurations, which can be categorized as: soft-mounted isolation systems and hard-mounted isolation systems. The soft-mounted systems are inherently insensitive to resonance in the main structure below the isolators. Yet, they are sensitive to resonances in the isolated platform. The hard-mounted systems are extremely stiff and allows for large onboard disturbance forces without excessive motion. However, the major drawback with a hard-mounted system is that vibration isolation performance suffers from the passive-active compromise and is unable to come up to the optimal performance. In this paper, a sliding-mode control algorithm is developed for a hard-mounted isolation system with a piezoactuator. Based on the bounds of environmental vibrations and onboard disturbances, the sliding-mode control algorithm can make the hard-mounted isolation system achieve the optimal and robust performance of low vibration transmissibility and high stiffness. The results are verified by the numerical simulations.

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