Papers by Keyword: Magneto-Rheological (MR) Damper

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Authors: Zhi Yong Zhang, Cai Xia Huang, Xin Liu, Xiang Hong Wang
Abstract: Due to the virtue in energy consumption, response time and work reliability, the magneto-rheological (MR) damper is a new promising devices for vibration control, in which the controller input expected control force and piston velocity to justify MR damper input voltage, so that desired damper force is achieved. It follows that the functional relationship between input voltage, expected control force and piston velocity is important for MR damper application. In this paper, a novel simplified and high-precision inverse dynamics model is derived based on MR damper Bouc-Wen phenomenological model, by which the input voltage of MR damper is calculated by means of expected control force and piston velocity. To verify the validity of this proposed inverse dynamics model, two numerical simulations of MR damper force following tests are introduced in the latter of this paper.
273
Authors: Bogdan Sapiński
Abstract: The study is devoted to the electromagnetic induction device (EID) attached to the magnetorheological (MR) damper. The study covers design considerations, calculations of magnetic field, fabrication and testing of the EID on the dynamic testing machine (DTM).
819
Authors: De Kun Yue, Qi Wang
Abstract: Uncertainty for the building structure and nonlinear, this simulation of a multi-storey structure under earthquake is presented based on the BP neural network and system identification, controller will be built to effectively reduce the structural response, and to strengthen the unique damper performance.
654
Authors: Chia Pao Chang, Ying Hsiang Lin, Yu Cheng Chen
Abstract: Magnetorheological fluid (MR fluid) has been widely used in the industrial fields, especially in the machinery, automobile, national defense and construction industries. Most of the researches of the Magnetorheological Damper only utilized device to examine the effects of different levels of voltage, amplitude and frequency on energy reduction. They find a combination of the number of circles of wire, damping tubes, enameled wire sleeves for liquid of MR damper controlled to increase the damping force. This study uses different ways to solve the problem. We think outside the box and apply the concepts and technology of systematic innovation method to improve the structure of the MR damper for increasing the effectiveness. This study uses the contradiction matrix, 39 engineering parameters, and 40 inventive and innovative principles to identify the areas of improvement to address the exist problems. Regarding the decrease of the magnetic field acting force due to increase of the moving distance and the effect on the magnetorheological damper efficiency. Finally, we propose an improved design of the MR Damper.
3586
Authors: Antonio Occhiuzzi
Abstract: Control algorithms for semi-active structural control system found in the scientific literature often rely on the choice of several parameters included in the control law. The present paper shows the preliminary conclusions of a study aiming to explain the weak dependency of the response reduction associated to semi-active control systems on the particular choice of the control algorithm adopted, provided that the relevant parameters of any control law be properly tuned.
182
Authors: Kum Gil Sung
Abstract: This paper presents vibration control responses of a multi-story structure installed with a semi-active magneto-rheological(MR) damper. As a first step, performance characteristics of three different working modes for MR fluid are compared and the mixed mode type of MR damper is chosen as an optimal candidate for the vibration control of the multi-story structure. An appropriate size of the mixed mode MR damper is devised and manufactured on the basis of the field-dependent Bingham model of the MR fluid which is commercially available. The damping force of the mixed mode MR damper is evaluated with respect to the excitation frequency at various magnetic fields. After formulating the governing equation of motion for the small scaled three-story structure associated with the MR damper, the linear quadratic regulator(LQR) controller to effectively suppress unwanted structural vibrations is designed by imposing semi-active actuating conditions. The control algorithm is then empirically implemented under earthquake conditions and the control responses of the horizontal relative displacement and acceleration are evaluated in time and frequency domains through computer simulations.
1778
Authors: Fu Li, Li Ping Lin, Wei Hu, Guang Lei Meng
Abstract: Magneto-rheological damper is an adjustable damping smart drive. Its advantage lies that the magneto-rheological fluid can rapidly and reversibly change Newtonian fluid with good liquidity into plastic solid with high viscosity and low liquidity in the millisecond time. And then it can be easily combined with control. MR damper has obtained a certain application in vibration control of automotive, machinery, construction and other areas. In this paper, the writer focus on describing control strategy present situation and the advantages and disadvantages of various control strategies of magneto-rheological damper based on impact load. And he makes a more detailed analysis of difficulties and future trends of magneto-rheological damper based on impact load.
4664
Authors: Hai Jun Xing
Abstract: In this paper, utilizing Herschel-Bulkley model, the equation of MR fluid pressure gradient is derived in order to predict MR damper’s force-velocity behavior. The equation, showing as a complicated nonlinear algebraic expression including various parameters, is then simplified to a nondimensional equation. This is followed by the analysis of the root of this nondimensional equation and an approximate root closely corresponding to numerical result is given.
311
Authors: Xiao Ming Han, Yu Cheng Bo, Qiang Li, Ji Huang
Abstract: In order to improve recoil mechanism’s buffering function of automatic weapon, using Newton’s second law, its recoil movement is analyzed and design model of magneto-rheological (MR) damper under impact loads is built. Structure parameter and control strategy are defined. Dampers’ characteristic curves at different magnetizing currents and different recoil speeds are tested on a damper indicator test bench. Some weapon’s recoil forces are artificially computed. The research results indicate that MR dampers have a perfect damping plateau effect. Recoil force of automatic weapon will be reduced by a big margin using the property that MR fluid can change at applied magnetic to control damping rules.
2045
Authors: Hong Sheng Hu, Juan Wang
Abstract: Combining with the current development trend of vehicle suspension and damper technology, different standards of MR dampers are respectively developed in this paper in order to solve problems the semi-active suspend engineering application brings, where its structure design of a certain type of MR damper is detailedly analyzed from the point of engineering view. In order to speed up the progress of MR damper development, based on 1/4 suspend hardware-in-the-loop tester, the integrated developing platform for MR damper with embedded controller is designed and developed, in which some key parts are included, such as assistant algorithm of structure design, exploitation tool of speediness testing, communication interface of CAN bus. The integrated developing platform for MR damper with embedded controller is the same with MR product’s exploitation flow. Finally, its hardware and software design of the measuring-controlling unit for MR damper with embedded controller, are introduced, and some test results are also show and analyzed. Experimental results prove that the developed MR damper with embedded controller would have a widely application prospect.
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