Modeling of Passive Adaptive MR Damper

2011 ◽  
Vol 311-313 ◽  
pp. 2187-2191 ◽  
Author(s):  
Xiao Lei Gu ◽  
Zhi Feng Tang ◽  
Fu Zai Lv ◽  
Lei Liu
Keyword(s):  
Magnetic Circuit ◽  
Mr Damper ◽  
Damping Force ◽  
Bingham Model ◽  
Energy Devices ◽  
Inverse Effect ◽  
New Type ◽  
Self Adaptation ◽  
Magnetomechanical Effect ◽  
Mr Effect

Passive adaptive MR damper is a new type of damper based on GMM inverse effect and MR effect, and it doesn’t need energy devices and can realize external force self-adaptation. A model of passive adaptive MR damper is established based on Jiles-Atherton model, the law of approach for the magnetomechanical effect, the magnetic circuit law and Bingham model. Experimental results show that the value of damping force is related to displacement and velocity: the larger the displacement, the greater the damping force; the faster the speed, the greater the damping force. This is consistent with the model.

Research on Modelling and Experiment for Passive Adaptive MR Damper Based on GMM Inverse Effect

2014 ◽  
Vol 621 ◽  
pp. 260-267
Author(s):  
Pan Ding ◽  
Xiao Juan Liu ◽  
Peng Fei Li ◽  
You Zhou Jiao ◽  
Quan Guo Zhang
Keyword(s):  
Magnetic Circuit ◽  
Mr Damper ◽  
Mechanical Effect ◽  
Damping Force ◽  
Bingham Model ◽  
Energy Devices ◽  
Inverse Effect ◽  
New Type ◽  
Self Adaptation ◽  
Mr Effect

Aiming at the limit of energy in quakeproof, aerospace and field ordnance, and requirements for damper’s different damping force in vehicle vibration’s pull and press stroke, a passive adaptive MR damper was designed and made. Passive adaptive MR damper is a new type of damper based on GMM inverse effect and MR effect, and it doesn’t need energy devices and can realize external force self-adaptation. A model of passive adaptive MR damper is established based on Jiles-Atherton model, the law of approach for the magneto mechanical effect, the magnetic circuit law and Bingham model. Experimental results show that the value of damping force is related to displacement and velocity: the larger the displacement, the greater the damping force; the faster the speed, the greater the damping force. This is consistent with the model. The damper has characteristic of load adaptive. Feasibility of the design was verified.

Design and Drop Test of Aircraft Landing Gear’s Shock Absorber Based on Magnetorheological Damper

2014 ◽  
Vol 665 ◽  
pp. 601-606
Author(s):  
Xiao Chuan Liu ◽  
Shi Xing Zhu ◽  
Yong Gang Yang
Keyword(s):  
Shock Absorber ◽  
Magnetic Circuit ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Damping Force ◽  
Damping Characteristics ◽  
Aircraft Landing ◽  
Piston Displacement ◽  
Drop Tests ◽  
Better Than

The structure of a shock absorber based on magnetorheological (MR) damper with a metering pin is proposed, and structure of the magnetic circuit of MR damper is optimized. By drop tests, the damping characteristics of the shock absorber and damping effect are tested. The experimental results show that the shock absorber has the characteristic of a wide damping force adjustment range and lower energy dissipation. The maximum vertical load and shock absorber piston displacement can be changed at same drop height by changing the current. It has also been proved that shock absorber based on MR damper is better than conventional oleo-pneumatic shock absorber on adjustment of damping force.

scholarly journals Stability Analysis of Magneto-Rheological Damper for Suspension of Commercial Vehicles

2019 ◽  
Vol 8 (6) ◽  
pp. 668-676
Keyword(s):  
Mr Damper ◽  
System Optimization ◽  
Design Parameters ◽  
Commercial Vehicles ◽  
Damping Force ◽  
Bingham Model ◽  
Shock Absorbers ◽  
Proposed Model ◽  
Magneto Rheological ◽  
Rheological Effect

This paper aims at improving the efficiency of magneto-rheological dampers, which utilizes a smart material in the form of magneto-rheological fluid, over the typical-build conventional dampers. The proposed design has been modeled for its implementation in commercial vehicles which extensively relies on conventional shock-absorbers for the safety and comfort of its occupants, considering the space available for mounting the system. Dimensional constraints based on commercial vehicles pertaining to the hatchback segment have been taken in COMSOL® and analyzed to generate a considerable amount of damping force for realizable inputs. As the analysis requires a profound consideration of highly coupled physics interface, COMSOL® Multi-physics is chosen as the relevant platform which makes it suitable to fulfill the criteria at hand. The damping forces achieved in the model are determined based on the linear Bingham model and the non-linear hysteretic Bouc-Wen model. A rigorousanalysis was conducted to realize the variation in damping force values on account of the hysteresis losses induced in the system. Optimization based on Taguchi’s mixed level design approach is used to attain the optimal design parameters of MR damper. MRF-140 CG fabricated by Lord Corporation is adopted to introduce the rheological effect of MR fluid on the proposed model.

Manufacture and Performance Test of New Type MR Damper

2012 ◽  
Vol 256-259 ◽  
pp. 2771-2774
Author(s):  
Song Jian Sun
Keyword(s):  
Small Proportion ◽  
High Frequency ◽  
Performance Test ◽  
Mr Damper ◽  
Hysteresis Curve ◽  
Damping Force ◽  
Hydraulic Servo ◽  
New Type ◽  
Hydraulic Servo System ◽  
And Performance

A new type of small proportion double rod structure magnetorheological(MR) damper was manufactured in this article, and the damper performance test was taken on electro-hydraulic servo system. The results indicate that the damper is not only able to provide a large damping force, but also its adjustable coefficient is high. And the hysteresis curve is still good in a high-frequency vibration, so it has a good stability.

Damping characteristics of a magneto-rheological damper with dual independent controllable ducts

2021 ◽  
pp. 1045389X2110188
Author(s):  
Jianqiang Yu ◽  
Xiaomin Dong ◽  
Tao Wang ◽  
Zhengmu Zhou ◽  
Yaqin Zhou
Keyword(s):  
Dynamic Range ◽  
Fluid Flows ◽  
Mr Damper ◽  
Viscous Damping ◽  
The Novel ◽  
The Finite Element Method ◽  
Damping Force ◽  
Damping Characteristics ◽  
Magneto Rheological ◽  
The Mathematical Model

This paper presents the damping characteristics of a linear magneto-rheological (MR) damper with dual controllable ducts based on numerical and experimental analysis. The novel MR damper consisting of a dual-rod cylinder system and a MR valve is used to reduce the influences of viscous damping force and improve dynamic range. Driven by the dual-rod cylinder system, MR fluid flows in the MR valve. The pressure drop of the MR valve with dual independent controllable ducts can be controlled by tuning the current of two independent coils. Based on the mathematical model and the finite element method, the damping characteristics of the MR damper is simulated. A prototype is designed and tested on MTS machine to evaluate its damping characteristics. The results show that the working states and damping force of the MR damper can be controlled by the two independent coils.

scholarly journals Special Finite Elements with Adaptive Strain Field on the Example of One-Dimensional Elements

2021 ◽  
Vol 11 (2) ◽  
pp. 609
Author(s):  
Tadeusz Chyży ◽  
Monika Mackiewicz
Keyword(s):  
Finite Elements ◽  
Strain Field ◽  
Main Idea ◽  
Deformation Field ◽  
Geometrical Parameters ◽  
Single Element ◽  
One Dimensional ◽  
New Type ◽  
Self Adaptation ◽  
Adaptation Method

The conception of special finite elements called multi-area elements for the analysis of structures with different stiffness areas has been presented in the paper. A new type of finite element has been determined in order to perform analyses and calculations of heterogeneous, multi-coherent, and layered structures using fewer finite elements and it provides proper accuracy of the results. The main advantage of the presented special multi-area elements is the possibility that areas of the structure with different stiffness and geometrical parameters can be described by single element integrated in subdivisions (sub-areas). The formulation of such elements has been presented with the example of one-dimensional elements. The main idea of developed elements is the assumption that the deformation field inside the element is dependent on its geometry and stiffness distribution. The deformation field can be changed and adjusted during the calculation process that is why such elements can be treated as self-adaptive. The application of the self-adaptation method on strain field should simplify the analysis of complex non-linear problems and increase their accuracy. In order to confirm the correctness of the established assumptions, comparative analyses have been carried out and potential areas of application have been indicated.

scholarly journals A smart passive MR damper with a hybrid powering system for impact mitigation: An experimental study

2021 ◽  
pp. 1045389X2098808
Author(s):  
S. Jin ◽  
L. Deng ◽  
J. Yang ◽  
S. Sun ◽  
D. Ning ◽  
...  
Keyword(s):  
Impact Velocity ◽  
Mr Damper ◽  
Damping Force ◽  
Softening Effect ◽  
Impact Speed ◽  
Impact Mitigation ◽  
Passive Damper ◽  
Comparison Results ◽  
Wide Range ◽  
The Impact

This paper presents a smart passive MR damper with fast-responsive characteristics for impact mitigation. The hybrid powering system of the MR damper, composed of batteries and self-powering component, enables the damping of the MR damper to be negatively proportional to the impact velocity, which is called rate-dependent softening effect. This effect can keep the damping force as the maximum allowable constant force under different impact speed and thus improve the efficiency of the shock energy mitigation. The structure, prototype and working principle of the new MR damper are presented firstly. Then a vibration platform was used to characterize the dynamic property and the self-powering capability of the new MR damper. The impact mitigation performance of the new MR damper was evaluated using a drop hammer and compared with a passive damper. The comparison results demonstrate that the damping force generated by the new MR damper can be constant over a large range of impact velocity while the passive damper cannot. The special characteristics of the new MR damper can improve its energy dissipation efficiency over a wide range of impact speed and keep occupants and mechanical structures safe.

Designing Requirement of Spring and MR Damper for New Type Baby Car Seat

2015 ◽  
Vol 741 ◽  
pp. 28-31 ◽  
Author(s):  
Chang Hyun Cho ◽  
Seung Bok Choi
Keyword(s):  
Mr Damper ◽  
Modern Society ◽  
Magnetorheological Damper ◽  
Car Seat ◽  
Car Safety ◽  
New Type ◽  
Design Requirements ◽  
The Law ◽  
Car Accident ◽  
Safety Seat

In modern society, a plenty of car accident is occurred and a lot of people get injury every day. For this reason, the importance of car safety has been increased and car safety has been extensively studied. Especially in many countries, the law about using baby safety seat is legislated to protect babies and children from accident. Thus, recently numerous products for baby safety have been developed. In this paper, a new type baby car seat is proposed to protect babies and children from frontal accident. In order to achieve this goal, design requirements of spring and MR(Magnetorheological) Damper which are main elements for a new type baby car seat are investigated.

Elastic-Plastic Time History Analysis of MR Damping Structure Based on LQG Algorithm

2016 ◽  
Vol 858 ◽  
pp. 145-150
Author(s):  
Yu Liang Zhao ◽  
Zhao Dong Xu
Keyword(s):  
Optimal Control ◽  
Time History ◽  
Mr Damper ◽  
Time History Analysis ◽  
Control Force ◽  
Control Effect ◽  
Damping Force ◽  
Optimal Control Strategy ◽  
Elastic Plastic ◽  
History Analysis

This paper discussed an elastic-plastic time-history analysis on a structure with MR dampers based on member model, in which the elastoplastic member of the structure is assumed to be single component model and simulated by threefold line stiffness retrograde model. In order to obtain better control effect, Linear Quadratic Gaussian (LQG) control algorithm is used to calculate the optimal control force, and Hrovat boundary optimal control strategy is used to describe the adjustable damping force range of MR damper. The effectiveness of the MR damper based on LQG algorithm to control the response of the structure was investigated. The results from numerical simulations demonstrate that LQG algorithm can effectively improve the response of the structure against seismic excitations only with acceleration feedback.

scholarly journals Design and multi-physics optimization of a novel magnetorheological damper with a variable resistance gap

2016 ◽  
Vol 231 (17) ◽  
pp. 3152-3168 ◽  
Author(s):  
Jiajia Zheng ◽  
Yancheng Li ◽  
Jiong Wang
Keyword(s):  
Optimization Problem ◽  
Dynamic Range ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Voltage Source ◽  
Damping Force ◽  
Variable Resistance ◽  
Design Variables ◽  
Electromagnetic Coils ◽  
Vibration Performance

This paper presents the design and multi-physics optimization of a novel multi-coil magnetorheological (MR) damper with a variable resistance gap (VRG-MMD). Enabling four electromagnetic coils (EMs) with individual exciting currents, a simplified magnetic equivalent circuit was presented and the magnetic flux generated by each voltage source passing through each active gap was calculated as vector operations. To design the optimal geometry of the VRG-MMD, the multi-physics optimization problem including electromagnetics and fluid dynamics has been formulated as a multi-objective function with weighting ratios among total damping force, dynamic range, and inductive time constant. Based on the selected design variables (DVs), six cases with different weighting ratios were optimized using Bound Optimization BY Quadratic Approximation (BOBYQA) technique. Finally, the vibration performance of the optimal VRG-MMD subjected to sinusoidal and triangle displacement excitations was compared to that of the typical multi-coil MR damper.

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