Vibration Suppression by Controlling an MR Damper

1999 ◽  
Vol 13 (14n16) ◽  
pp. 2221-2228 ◽  
Author(s):  
Doyoung Jeon ◽  
Chanho Park ◽  
Kiyang Park
Keyword(s):  
Mechanical Properties ◽  
Time Delay ◽  
Response Time ◽  
Vibration Control ◽  
Control Systems ◽  
Vibration Suppression ◽  
Mr Damper ◽  
Mr Fluid ◽  
Mr Fluids

For the semiactive vibration control, a variable damper and proper control systems are essential. In this research a controllable damper was designed using the MR fluids and its mechanical properties such as damping constant and response time were measured. Since the response time of the MR damper was much longer than nominal MR fluid response time, the time delay of the damper should be considered in the design of controllers. It is shown that the advanced on/off vibration control which includes the damper time delay performs more effectively than the conventional one.

Frequency Shaped Semi-Active Control for Magnetorheological Fluid-Based Vibration Control Systems

2013 ◽  
Author(s):  
Young-Tai Choi ◽  
Norman M. Wereley ◽  
Gregory J. Hiemenz
Keyword(s):  
Vibration Control ◽  
Control Systems ◽  
Active Control ◽  
Control Algorithm ◽  
Active Vibration Control ◽  
Control Algorithms ◽  
Model Parameters ◽  
Mr Fluid ◽  
Control Current ◽  
Active Vibration

Novel semi-active vibration controllers are developed in this study for magnetorheological (MR) fluid-based vibration control systems, including: (1) a band-pass frequency shaped semi-active control algorithm, (2) a narrow-band frequency shaped semi-active control algorithm. These semi-active vibration control algorithms designed without resorting to the implementation of an active vibration control algorithms upon which is superposed the energy dissipation constraint. These new Frequency Shaped Semi-active Control (FSSC) algorithms require neither an accurate damper (or actuator) model, nor system identification of damper model parameters for determining control current input. In the design procedure for the FSSC algorithms, the semi-active MR damper is not treated as an active force producing actuator, but rather is treated in the design process as a semi-active dissipative device. The control signal from the FSSC algorithms is a control current, and not a control force as is typically done for active controllers. In this study, two FSSC algorithms are formulated and performance of each is assessed via simulation. Performance of the FSSC vibration controllers is evaluated using a single-degree-of-freedom (DOF) MR fluid-based engine mount system. To better understand the control characteristics and advantages of the two FSSC algorithms, the vibration mitigation performance of a semi-active skyhook control algorithm, which is the classical semi-active controller used in base excitation problems, is compared to the two FSSC algorithms.

A Semi-Active, High-Torque, Magnetorheological Fluid Limited Slip Differential Clutch

2006 ◽  
Vol 128 (5) ◽  
pp. 604-610 ◽  
Author(s):  
Barkan Kavlicoglu ◽  
Faramarz Gordaninejad ◽  
Cahit Evrensel ◽  
Alan Fuchs ◽  
George Korol
Keyword(s):  
Response Time ◽  
Three Dimensional ◽  
Fast Response ◽  
Design Development ◽  
Element Analysis ◽  
Mr Fluid ◽  
Bingham Plastic ◽  
Mr Fluids ◽  
Torque Transmission ◽  
And Performance

The design, development, and performance characterization of a magnetorheological (MR) fluid clutch for automotive limited slip differential (LSD) applications is presented in this study. The controllability of MR fluids provides an adjustable torque transmission and slippage for the LSD application. Three-dimensional electromagnetic finite element analysis (FEA) is performed to optimize the magnetic circuit and clutch design. Based on the results obtained from the FEA, the theoretical torque transfer capacity of the clutch is predicted utilizing Bingham-Plastic constitutive model. The clutch is characterized at different velocities and electromagnet electric input currents. Both the torque transfer capacity and the response time of the clutch were examined. It was demonstrated that the proposed MR fluid LSD clutch is capable of transferring controllable high torques with a fast response time.

Analysis and Strategy for Superharmonics With Semiactive Suspension Control Systems

2007 ◽  
Vol 129 (6) ◽  
pp. 795-803 ◽  
Author(s):  
Xubin Song ◽  
Mehdi Ahmadian ◽  
Steve Southward
Keyword(s):  
Adaptive Control ◽  
Control Systems ◽  
Adaptive Algorithm ◽  
Vibration Suppression ◽  
Negative Impact ◽  
Mr Damper ◽  
System Stability ◽  
Structural Vibration ◽  
Vehicle Suspensions ◽  
Seat Suspension

This paper focuses on an experimental implementation of a semiactive seat suspension using magnetorheological (MR) dampers. We first introduce the nonlinear dynamics phenomena induced by skyhook control. Skyhook control has been widely applied to applications ranging from structural vibration suppression to commercialized vehicle suspensions. Unfortunately, skyhook control generates superharmonic dynamics; yet, this issue has not been clearly addressed in such vibration control systems. This paper will attempt to explain how superharmonics are created with skyhook controls through analysis of test data. Furthermore, a nonlinear model-based adaptive control algorithm is developed and evaluated for reducing the negative impact of the superharmonics. Based on an empirical MR damper model, the adaptive algorithm is expanded mathematically, and the system stability is discussed. Then in the following sections, this paper describes implementation procedures such as modeling simplification and validation, and testing results. Through the laboratory testing, the adaptive suspension is compared to two passive suspensions: hard-damping (stiff) suspension with a maximum current of 1A to the MR damper and low-damping (soft) suspension with a low current of 0A, while broadband random excitations are applied with respect to the seat suspension resonant frequency in order to test the adaptability of the adaptive control. In two separate studies, both mass and spring rate are assumed known and unknown in order to investigate the capability of the adaptive algorithm with the simplified model. Finally, the comparison of test results is presented to show the effectiveness and feasibility of the proposed adaptive algorithm to eliminate the superharmonics from the MR seat suspension response.

Synthesis and Experimental Validation of a Delayed Reference Controller for Active Vibration Suppression in Mechanical Systems

2004 ◽  
Vol 72 (4) ◽  
pp. 623-627 ◽  
Author(s):  
P. Gallina ◽  
A. Trevisani
Keyword(s):  
Time Delay ◽  
Vibration Control ◽  
Experimental Validation ◽  
Vibration Suppression ◽  
Overhead Cranes ◽  
Simple Pendulum ◽  
Active Vibration Suppression ◽  
Control Scheme ◽  
Active Vibration ◽  
Two Degree Of Freedom

This paper introduces a non-time-based control scheme for active position and vibration control of two-degree-of-freedom systems by applying it to the path-tracking and swing control of a system composed of a trolley and a simple pendulum. The basic idea behind such a scheme is to make the path reference of the trolley a function of the time and of a time delay. This latter, which is affected by the measured oscillation, is calculated on-the-fly in order to reduce the swing phenomenon. The effectiveness of the proposed control scheme, which may have application to the control of overhead cranes, is proved experimentally.

Control and Response Characteristics of a Mixed Mode MR Damper for a Multi-Story Structure

2013 ◽  
Vol 284-287 ◽  
pp. 1778-1782
Author(s):  
Kum Gil Sung
Keyword(s):  
Vibration Control ◽  
Mixed Mode ◽  
Excitation Frequency ◽  
Mr Damper ◽  
Linear Quadratic Regulator ◽  
Relative Displacement ◽  
Linear Quadratic ◽  
Damping Force ◽  
Story Structure ◽  
Mr Fluid

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.

scholarly journals Transient Magnetic Model of Magnetorheological Damper and Its Experimental Verification

2018 ◽  
Vol 153 ◽  
pp. 06002 ◽  
Author(s):  
Kubík Michal ◽  
Macháček Ondřej ◽  
Strecker Zbyněk ◽  
Roupec Jakub ◽  
Novák Petr ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Response Time ◽  
Experimental Verification ◽  
Magnetic Circuit ◽  
Material Selection ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Dynamic Force ◽  
Mr Fluid ◽  
Magnetic Model

The present paper deals with the transient magnetic model of the magnetorheological (MR) damper and its experimental verification. The response time of MR damper affects the quality of semi-active control of this damper. The lower the response time, the higher the system efficiency. The most important part of the response time of the MR damper is the response time of magnetic field of the MR damper which can be determined by transient magnetic model. The transient magnetic model was created by the software Ansys Electromagnetics 17.1 as 2D axisymmetric and verified by measurement of magnetic field in the gap of MR damper piston. The maximum difference between the model and the experiment was 28 %. The response time depends on the electric current in the coil of MR damper. The transient magnetic model was used for determination of influence of MR fluid type, material of cover and material of magnetic circuit on the response time of magnetic field of MR damper. The type of MR fluid has a significant influence on the response time. The lower the mass concentration of ferromagnetic particles, the lower the response time of magnetic field. A material selection of magnetic circuit is always a trade-off between the response time and the maximum magnetic flux density (dynamic force range) in the gap of the MR damper. According to the verified transient magnetic model, it is possible to find a suitable material of magnetic circuit for specific application (response time).

Development of Large Capacity Semi-Active Seismic Damper Using Magneto-Rheological Fluid

2004 ◽  
Vol 126 (1) ◽  
pp. 105-109 ◽  
Author(s):  
Hiroshi Sodeyama ◽  
Kohei Suzuki ◽  
Katsuaki Sunakoda
Keyword(s):  
Magnetic Fields ◽  
Large Scale ◽  
Hysteresis Loops ◽  
Mr Damper ◽  
Damping Force ◽  
Engineering Structures ◽  
Mr Fluid ◽  
Large Capacity ◽  
Mr Fluids ◽  
Magneto Rheological

In recent years, there has been increasing research in several industrial fields for development of semi-active vibration control devices. In particular, devices using magneto-rheological (MR) fluid have been attracting great research interest because they can realize high performance as capacity-variable dampers. MR fluids are controllable fluids that respond to applied magnetic fields. Applied magnetic fields drastically change the viscosity of MR fluids from an oily state to a semi-solid state. This paper describes a study on a large capacity device using an MR fluid, i.e., an MR damper. This developed MR damper provides a maximum damping force of 300 kN. Various tests were carried out and the dynamic characteristics, force-displacement hysteresis loops and controllable forces were investigated. These tests verified that the MR damper provides a technology that enables effective semi-active control of large-scale structure systems, i.e., real buildings and civil engineering structures.

Multiple Smart Material Applications Using SMA and MR Fluid Damper for Rotor Vibration Control

2010 ◽  
Author(s):  
T. S. Aravindhan ◽  
K. Gupta
Keyword(s):  
Vibration Control ◽  
Smart Materials ◽  
Resonance Condition ◽  
Mr Damper ◽  
Experimental Results ◽  
Rotor Vibration ◽  
Mr Fluid ◽  
Fluid Damper ◽  
Mr Fluid Damper ◽  
Rotor Model

Application of two smart materials, namely shape memory alloy (SMA) and magnetorheological fluid (MRF) for rotor vibration control is explored to control the synchronous vibration of rotors crossing resonance condition. First a single degree of freedom system is analyzed to study the effect of SMA and MR fluid damper individually, and then the simulations are repeated to find the feasibility of using the two smart materials simultaneously. An MRF damper is designed, fabricated and installed on a rotor system. The fabricated MR damper is tested and an ANFIS model is trained to predict the damper force in the simulations carried out. The experimental rotor model is analyzed using finite element method in Matlab™. Simulations are carried out to study the effect of MR damper on rotor vibration response. Experimental results obtained from the rotor model with the fabricated MRF damper show considerable reduction in peak vertical amplitude as the current in the MR damper coils is increased. A good correlation between the theoretical and experimental results is observed.

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