Topic
Magnetorheological damper
About: Magnetorheological damper is a research topic. Over the lifetime, 1324 publications have been published within this topic receiving 18459 citations.
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TL;DR: In this paper, a completely new magnetorheological fluid (MRF) damper model is proposed for semi-active control of automotive suspensions. But, unlike the conventional solutions where the coil axis is usually superposed on the damper axis and where the inner cylindrical housing is part of the magnetic circuit, the coils are wound in a direction perpendicular to the dampers axis.
Abstract: The development of a powerful new magnetorheological fluid (MRF), together with recent progress in the understanding of the behavior of such fluids, has convinced researchers and engineers that MRF dampers are among the most promising devices for semi-active automotive suspension vibration control, because of their large force capacity and their inherent ability to provide a simple, fast and robust interface between electronic controls and mechanical components. In this paper, theoretical and experimental studies are performed for the design, development and testing of a completely new MRF damper model that can be used for the semi-active control of automotive suspensions. The MR damper technology presented in this paper is based on a completely new approach where, in contrast to in the conventional solutions where the coil axis is usually superposed on the damper axis and where the inner cylindrical housing is part of the magnetic circuit, the coils are wound in a direction perpendicular to the damper axis. The paper investigates approaches to optimizing the dynamic response and provides experimental verification. Both experimental and theoretical results have shown that, if this particular model is filled with an 'MRF 336AG' MR fluid, it can provide large controllable damping forces that require only a small amount of energy. For a magnetizing system with four coils, the damping coefficient could be increased by up to three times for an excitation current of only 2 A. Such current could be reduced to less than 1 A if the magnetizing system used eight small cores. In this case, the magnetic field will be more powerful and more regularly distributed. In the presence of harmonic excitation, such a design will allow the optimum compromise between comfort and stability to be reached over different intervals of the excitation frequencies.
117 citations
TL;DR: In this article, an experimental and a theoretical study were carried out to predict the dynamic performance of a linear magnetorheological (MR) fluid damper, and the results showed that the flow model can accurately capture the dynamic force range of the MR damper.
116 citations
TL;DR: In this paper, three semi-active control methods are investigated for use in a suspension system using a commer- cial magnetorheological damper, including the limited relative displacement method, the modified skyhook method, and the modified Rakheja-Sankar method.
Abstract: Three semi-active control methods are investigated for use in a suspension system using a commer- cial magnetorheological damper. The three control methods are the limited relative displacement method, the modified skyhook method, and the modified Rakheja-Sankar method. The method of averaging has been adopted to provide an analytical platform for analyzing the performance of the different control methods. The analytical results are verified using numerical simulation, and further are used to assess the efficiency of dif- ferent control methods. An experimental test bed has been developed to examine the three control methods under sinusoidal and random excitations. Both analytical and experimental results confirm that the Rakheja- Sankar control and modified skyhook control methods significantly reduce the root-mean-square response of both the acceleration and relative displacement of the sprung mass, while the limited relative displacement controller can only control the relative displacement of the suspension system.
116 citations
TL;DR: In this article, the effect of the cylinder's surface temperature on both the direct and inverse dynamics of the damper is studied, and the neural network model is shown to be reasonably robust against significant temperature variation.
114 citations
TL;DR: In this article, a new mathematical model was proposed to describe the dynamic behavior of a magnetorheological damper, based on a modification to the well-known LuGre friction model; it is simpler than other models already suggested in the literature and offers a similar level of accuracy.
Abstract: This paper presents a new mathematical model to describe the dynamic behavior of a magnetorheological damper. The proposed model is based on a modification to the well-known LuGre friction model; it is simpler than other models already suggested in the literature and offers a similar level of accuracy. To validate the proposed model, experimental tests applying controlled and random displacements and currents on a commercial damper were performed. Parameter identification algorithms were then used to fit the parameters that better describe the dynamic behavior of the damper. The identification scheme includes a closed-loop observer to estimate the internal state of the friction model. Results demonstrate very good model performance and indicate that the proposed model can be readily used in the design of semi-active control algorithms, state observers and on-line parameter identification schemes. Copyright © 2004 John Wiley & Sons, Ltd.
113 citations