Testing and Modeling of MR Damper and Its Application to SDOF Systems Using Integral Backstepping Technique

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Sk. Faruque Ali ◽  
Ananth Ramaswamy
Keyword(s):  
Active Control ◽  
Testing Machine ◽  
Mr Damper ◽  
Control Device ◽  
Magnetorheological Damper ◽  
Input Current ◽  
Magnetorheological Dampers ◽  
Damper Control ◽  
Nonlinear Devices ◽  
Current Monitoring

Magnetorheological dampers are intrinsically nonlinear devices, which make the modeling and design of a suitable control algorithm an interesting and challenging task. To evaluate the potential of magnetorheological (MR) dampers in control applications and to take full advantages of its unique features, a mathematical model to accurately reproduce its dynamic behavior has to be developed and then a proper control strategy has to be taken that is implementable and can fully utilize their capabilities as a semi-active control device. The present paper focuses on both the aspects. First, the paper reports the testing of a magnetorheological damper with an universal testing machine, for a set of frequency, amplitude, and current. A modified Bouc–Wen model considering the amplitude and input current dependence of the damper parameters has been proposed. It has been shown that the damper response can be satisfactorily predicted with this model. Second, a backstepping based nonlinear current monitoring of magnetorheological dampers for semi-active control of structures under earthquakes has been developed. It provides a stable nonlinear magnetorheological damper current monitoring directly based on system feedback such that current change in magnetorheological damper is gradual. Unlike other MR damper control techniques available in literature, the main advantage of the proposed technique lies in its current input prediction directly based on system feedback and smooth update of input current. Furthermore, while developing the proposed semi-active algorithm, the dynamics of the supplied and commanded current to the damper has been considered. The efficiency of the proposed technique has been shown taking a base isolated three story building under a set of seismic excitation. Comparison with widely used clipped-optimal strategy has also been shown.

The Calculation of the Equivalent Linear Damping Coefficient of the Magnetorheological Damper

2013 ◽  
Vol 336-338 ◽  
pp. 475-479 ◽  
Author(s):  
Yao Hui Guo ◽  
En Wei Chen ◽  
Qun Wu ◽  
Yi Min Lu ◽  
Zeng Qiang Xia
Keyword(s):  
Mr Damper ◽  
Magnetorheological Damper ◽  
Damping Coefficient ◽  
Control Voltage ◽  
Characteristic Analysis ◽  
Equivalent Damping ◽  
Equivalent Linear ◽  
Linear Damping ◽  
Damper Control ◽  
Equivalent Damping Coefficient

MR damper (magnetorheological damper) has broad application prospects, and equivalent damping coefficient is very important of its dynamic characteristic analysis. Based on the modified Bouc_Wen model, the performance of MR damper was analyzed and the equivalent linear damping coefficient of MR damper was calculated. Based on simulation date of the modified Bouc_Wen model, the relationships between the equivalent linear damping coefficient of MR damper and the parameters of control voltage and MR dampers movement amplitude were established by the curve fitting regression analysis method. Verification results prove that the equivalent linear damping coefficient model has higher accuracy. For the vibration systems using strongly nonlinear MR damper, new model can effectively improve the efficiency of calculating the vibration analysis and the stability of the system in a certain frequency. At the same time, the model provides a theoretical basis for the application of MR damper control.

Semi-Active Control for Vibration of Transmission Tower-Line with MRD

2014 ◽  
Vol 680 ◽  
pp. 422-425
Author(s):  
Wei Kong ◽  
Yun Fei Tao ◽  
Shi Guang Men
Keyword(s):  
Active Control ◽  
Control Algorithm ◽  
Mr Damper ◽  
Control Device ◽  
Transmission Tower ◽  
Passive Devices ◽  
Control Devices ◽  
Self Powered ◽  
Technological Means ◽  
Magneto Rheological

Magneto-rheological (MR) damper is a semi-active control device, which takes advantage of both the reliability of passive devices and the adaptability of fully active control devices and is widely used on many kinds of machines and civil works. But there are some particular problems when the MRD is used on transmission tower-line system.This article is aimed to introduce the technological means to these problems such as :choose sant colony algorithm as the suitable semi-active control algorithm; consider adopting Self-Powered/Self-Sensing structure to Increased general OS stability;

scholarly journals Modelling and performance evaluation of energy harvesting linear magnetorheological (MR) damper

2017 ◽  
Vol 36 (2) ◽  
pp. 177-192 ◽  
Author(s):  
Raju Ahamed ◽  
MM Rashid ◽  
MM Ferdaus ◽  
Hazlina B Yusuf
Keyword(s):  
Energy Harvesting ◽  
Output Voltage ◽  
Testing Machine ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Comsol Multiphysics ◽  
Damping Force ◽  
Universal Testing ◽  
Magnetorheological Damping ◽  
And Performance

In this study, an magnetorheological (MR) damper has been designed based on its energy harvesting capability which combines the key benefits of energy generation (reusing lost energy) and magnetorheological damping (controllable damping force). The energy harvesting part has a magnet and coil arrangement to generate energy. A two-dimensional axisymmetric model of the proposed magnetorheological damper is developed in COMSOL Multiphysics where different magnetic field properties are analysed generally by finite element method. Finally, the energy harvesting capability of the proposed magnetorheological damper model is tested by a universal testing machine and observed through an oscilloscope. The maximum induced output voltage was around 0.7 V.

Digital Resistance-Map Generation for a Magnetorheological Damper Based Platform for Rehabilitation Applications

2011 ◽  
Author(s):  
Ehsan Asadi ◽  
Siamak Arzanpour
Keyword(s):  
Mr Damper ◽  
Recovery Process ◽  
Magnetorheological Damper ◽  
Robotic Rehabilitation ◽  
Mr Dampers ◽  
Map Generation ◽  
Body Organ ◽  
Damper Control ◽  
The One ◽  
Control Methodology

This paper introduces a methodology for generating digital resistance-map that can be utilized in an MR-Damper based robotic rehabilitation. Typically, in rehabilitation procedures, patients are getting involved in the recovery process of gradually training weak and damaged muscles by constraining motion in repetitive exercises. The whole purpose of robotic rehabilitation is to restrict body organ motion to the one prescribed by the therapist at the initial steps of treatment to avoid further damages to other weak muscles while focusing on recovering a particular muscle. MR-Dampers are semi-active actuators that can potentially be employed for this application. These dampers can be activated to produce high resistance to motion, and a platform that contains sufficient number of them can be manipulated to create regions of different resistance against motion. To apply this to the robotic rehabilitation, the motion recommended by the therapist should be converted to the resistance-maps that can be used by MR-Damper for implementation. To accomplish that, procedure of generating the digital resistance map is introduced and several digital resistance-maps are created. An MR-damper control methodology is also developed to activate the dampers. This controller relies on the accurate modeling of the MR-Damper. Bouc-Wen model is used for MR-Damper modeling. A 3-D platform containing three linear MR-Dampers is modeled using SimMechanics. 1-D and 2-D models are used to develop the idea and build up 3-D model. Several simulations are carried out to investigate the performance of the systems in generating the prescribed digital resistance-maps. The promising results of the simulations indicate that the method can be adopted for robotic rehabilitation purposes.

DESIGN AND TESTING OF A COMPACT MAGNETORHEOLOGICAL DAMPER FOR HIGH IMPULSIVE LOADS

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1549-1555 ◽  
Author(s):  
WILLIAM B. FACEY ◽  
NICHOLAS C. ROSENFELD ◽  
YOUNG-TAI CHOI ◽  
NORMAN M. WERELEY ◽  
SEUNG BOK CHOI ◽  
...  
Keyword(s):  
High Pressures ◽  
Testing Machine ◽  
Mr Damper ◽  
Hydraulic Testing ◽  
Magnetorheological Damper ◽  
The Novel ◽  
Damping Force ◽  
Mr Dampers ◽  
High Shock ◽  
Damper Design

Magnetorheological (MR) based semi-active dampers for the protection of sensitive devices against high shock and impact is examined from design considerations to characterization testing. Shock and impact dampers should be able to produce a high damping force at high velocities. However, a specification requiring high damping force generally causes an increase in the size of shock and impact dampers, which motivates the study of MR dampers to retrofit existing or conventional passive shock and impact dampers. A novel MR damper design was developed in this study for achieving both design goals: high force and compactness. The novel MR damper design increases the number of magnetically active volumes through which fluid to passes while minimizing damper length. Through FEM (Finite Element Method) analysis, the magnetic properties of the proposed design are investigated prior to actual fabrication. In addition to the unique magnetic circuit, other considerations stemming from the high pressures and velocities expected in this device are addressed. Characterization testing was performed up to 12 Hz with 1 inch sinusoidal stroke on a servo-hydraulic testing machine. These tests demonstrate that the MR damper is able to provide a high damping force at high velocity.

scholarly journals Experimental attenuation and evaluation of whole body vibration for an off-road vehicle with magnetorheological dampers

2018 ◽  
Vol 38 (2) ◽  
pp. 852-870 ◽  
Author(s):  
Piotr Krauze ◽  
Jerzy Kasprzyk ◽  
Jaroslaw Rzepecki
Keyword(s):  
Ride Comfort ◽  
Health And Safety ◽  
Harmonic Excitation ◽  
Magnetorheological Damper ◽  
Vehicle Body ◽  
Whole Body ◽  
Magnetorheological Dampers ◽  
Passive Suspension ◽  
The Road ◽  
Damper Control

The paper presents an analysis of vehicle vibration, ride comfort and handling which have a decisive influence on health and safety of a driver. Experiments were carried out for a commercially available experimental all-terrain vehicle in the field in hard conditions with retaining the sufficient repeatability. The vehicle is equipped with a complex vibration control system, taking advantage of four automotive magnetorheological dampers. Numerous sensors, which measure acceleration in four points of the vehicle body, near the driver’s seat, feet and hands, body orientation in space and speed of vehicle wheels, are available in the vehicle. They were used for evaluation of magnetorheological dampers’ control signals and analysis of vibration affecting the driver. Constant values of magnetorheological damper control current were used for emulation of different settings of passive suspension. The analysis performed in frequency domain showed how vibration propagates in a medium-sized all-terrain vehicle and indicated that driver’s hands are mostly affected by the road-induced vibration. It was also confirmed that the greatest improvement of ride comfort can be obtained for the soft suspension, i.e. uncontrolled magnetorheological dampers. Furthermore, the Skyhook algorithm was implemented, including the proportional control of the magnetorheological damper force and the inverse Tanh model of the magnetorheological damper. It was validated for the wideband road-induced excitation contrary to the experiments commonly presented in the literature, which are performed only for harmonic excitation. It was shown that the properly tuned Skyhook algorithm enables improving vehicle handling compared to the passive suspension and simultaneously it can maintain the similar or even better results of ride comfort.

Parameter identification of modified Bouc–Wen model and analysis of size effect of magnetorheological dampers

2017 ◽  
Vol 29 (7) ◽  
pp. 1464-1480 ◽  
Author(s):  
Yongbo Peng ◽  
Jinggui Yang ◽  
Jie Li
Keyword(s):  
Size Effect ◽  
Performance Test ◽  
Functional Relationship ◽  
Excitation Frequency ◽  
Magnetorheological Damper ◽  
Input Current ◽  
Smart Devices ◽  
Model Parameters ◽  
Magnetorheological Dampers ◽  
Large Size

Magnetorheological damper is one of the most promising smart devices for vibration mitigation of structures subjected to dynamic loads. In order to fulfill the value of magnetorheological damping control, a feasible mechanical model of magnetorheological dampers with simplicity and sufficient accuracy is usually required in practice. It comes up, however, with a challenging issue for the modeling of large-size magnetorheological dampers due to physical constraints on the performance test. The large-size magnetorheological damper is typically modeled in up-scaling parameters associated with models of the small-size magnetorheological damper. This treatment remains open since a size effect hinges upon the intrinsic non-linearity inherent in the device. In this article, a dynamic test of a small-size magnetorheological damper is performed first. The relevance of damper force with the input current and excitation frequency is well revealed. The modified Bouc–Wen model is employed to logically represent the dynamic behaviors of magnetorheological dampers. Identification of model parameters in typical loading cases is then proceeded, of which the functional relationship against input current is established. The size effect of magnetorheological dampers is further addressed through investigating the functional relationship relevant to maximum outputs of 200, 10, and 5 kN. It is indicated that the small-size magnetorheological damper needs more number of control parameters than the large-size magnetorheological damper. Moreover, a linear current relevance of model parameters appears in the small-size magnetorheological damper, while a quadratic current relevance of model parameters appears in the large-size magnetorheological damper. Size effect of magnetorheological dampers arises to be well-marked in the range of low current and becomes unapparent in the range of high current. Besides, the validation of modified Bouc–Wen model is carried out that reveals the applicability of the model with case-optimized parameters.

Design, Fabrication, Testing, and Fuzzy Modeling of a Large Magnetorheological Damper for Vibration Control in a Railcar

Joint Rail ◽  
2003 ◽  
Author(s):  
Vipul S. Atray ◽  
Paul N. Roschke
Keyword(s):  
Vibration Control ◽  
Testing Machine ◽  
Fuzzy Model ◽  
Mr Damper ◽  
Variable Magnetic Field ◽  
Magnetorheological Damper ◽  
Computational Time ◽  
Design Parameters ◽  
Current Design ◽  
Vertical Vibrations

This paper presents the procedure used for design, fabrication, testing, and numerical modeling of a magnetorheological (MR) damper that is to be applied for vibration control in a 70-ton railcar. MR dampers are semiactive vibration control devices whose damping characteristics can be modified in real time by varying an applied current. Design parameters for the MR damper are estimated from those exhibited by a linear viscous damper that exerts the necessary force required to limit vertical vibrations of the rail truck within acceptable limits. An MR damper is fabricated by modifying the piston of a standard hydraulic damper to function as a solenoid. The assembled MR damper is tested in a uniaxial testing machine by subjecting it to sinusoidal and random displacements while simultaneously varying the current flowing in the solenoid. A variable magnetic field is applied to the MR fluid that fills the damper cavity and the resisting force exerted by the damper is recorded. Data collected in the laboratory are used to train a fuzzy model of the MR damper that characterizes its behavior. Results indicate that a fuzzy model of the MR damper can predict its behavior with a sufficient degree of accuracy while requiring minimal computational time.

Performance tests and mathematical model considering magnetic saturation for magnetorheological damper

2012 ◽  
Vol 23 (12) ◽  
pp. 1331-1349 ◽  
Author(s):  
Zhao-Dong Xu ◽  
Da-Huan Jia ◽  
Xiang-Cheng Zhang
Keyword(s):  
Mathematical Model ◽  
Excitation Frequency ◽  
Experimental Results ◽  
Displacement Amplitude ◽  
Magnetorheological Damper ◽  
Input Current ◽  
Magnetic Flux Density ◽  
Magnetic Saturation ◽  
Loading Frequency ◽  
Magnetorheological Dampers

As a semiactive control device, magnetorheological dampers have been paid more attention due to their high controllability, fast response, and low power demand. One of the important characteristics for magnetorheological dampers is magnetic saturation, that is, the maximum damping force will reach some value and no longer vary with the increasing input current, especially in the presence of large magnetic flux density. In order to take this problem into account fully, tests on a shear-valve mode magnetorheological damper are carried out to consider the effects of input current, displacement amplitude, and loading frequency on the properties of the magnetorheological damper during magnetic saturation situation first. Then, the magnetic saturation phenomenon of the magnetorheological damper is simulated using the finite element method, and the numerical simulation results are compared with the experimental results. Finally, a magnetic saturation mathematical model is proposed to describe the properties of the magnetorheological damper, and the numerical hysteresis curves of the proposed magnetic saturation mathematical model, the Bingham model, and the Bouc–Wen model are compared with the experimental results. It can be concluded that the magnetic saturation mathematical model can describe the influence of input current, displacement amplitude, and excitation frequency on the properties and the magnetic saturation property of the magnetorheological damper.

Vibration Control of a Seat Suspension System Using Magnetorheological Damper

2009 ◽  
Author(s):  
H. Metered ◽  
P. Bonello ◽  
S. O. Oyadiji
Keyword(s):  
Control System ◽  
Active Control ◽  
Ride Comfort ◽  
Mr Damper ◽  
Suspension System ◽  
Magnetorheological Damper ◽  
Performance Criteria ◽  
Effective Control ◽  
Damping Force ◽  
Seat Suspension

Seat suspension system is critical to the ride comfort experience of a vehicle’s driver and passengers. The use of a magnetorheological (MR) damper in a seat suspension system has been shown to offer significant benefits in this regard. Most research on seat MR dampers has applied active control strategies to command the MR damper, which is an inherently semi-active device. This paper introduces a more suitable semi-active control strategy for an MR damper used in a seat suspension, enabling more effective control. The proposed control system comprises a system controller that computes the desired damping force using a sliding mode control algorithm, and a neural-based damper controller that provides a direct estimation of the command voltage that is required to track the desired damping force. The seat suspension system is approximated by base-excited single degree of freedom system. The proposed semi-active seat suspension is compared to a passive seat suspension for prescribed base displacements. These inputs are representative of the vibration of the sprung mass of a passive or semi-active quarter-vehicle suspension under bump or random-profile road disturbance. Control performance criteria such as seat travel distance and seat acceleration are evaluated in time and frequency domains, in order to quantify the effectiveness of proposed semi-active control system. The simulated results reveal that the use of semi-active control in the seat suspension provides a significant improvement in ride comfort.

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