Time delay effects on large-scale MR damper based semi-active control strategies

2012 ◽  
Vol 22 (1) ◽  
pp. 015011 ◽  
Author(s):  
Y-J Cha ◽  
A K Agrawal ◽  
S J Dyke
Keyword(s):  
Time Delay ◽  
Active Control ◽  
Large Scale ◽  
Control Strategies ◽  
Mr Damper ◽  
Delay Effects

Semi-Active Helicopter Ground Resonance Suppression Using Magnetorheological Technology

2017 ◽  
Author(s):  
Ming Cheng ◽  
Zhaobo Chen
Keyword(s):  
Linear System ◽  
Active Control ◽  
Control Strategies ◽  
Classical Model ◽  
Mr Damper ◽  
System Stability ◽  
Flow Mode ◽  
Resonance Model ◽  
Ground Resonance ◽  
Stability Area

This paper discusses the semi-active control of helicopter ground resonance using magnetorheological (MR) damper. A dynamic model of a MR damper with bi-fold flow mode is built based on the hyperbolic tangent model and experimental data on mechanical properties; and its inverse model is derived for the control. An approximate analytical solution of a linear system is provided and a critical stability area is calculated according to the classical model of ground resonance and the method of determining the linear system stability. Then, Simulations are performed on the helicopter ground resonance model with three semi-active control strategies and the control performance is compared. Simulation results show that the comprehensive performance of the fuzzy skyhook control algorithm is superior to the on-off skyhook and continuous skyhook control algorithms.

Semi-Active Control for Large-Scale Aqueduct by MR Damper

2011 ◽  
Vol 204-210 ◽  
pp. 645-648
Author(s):  
Liang Huang ◽  
Bo Wang ◽  
Jian Guo Xu
Keyword(s):  
Active Control ◽  
Seismic Design ◽  
Mechanical Model ◽  
Large Scale ◽  
Mr Damper ◽  
Earthquake Excitation ◽  
Active Method ◽  
Reference Base ◽  
Active Devices ◽  
Magneto Rheological

The mechanical model of magneto rheological damper(MRD) is established, and the numerical simulation of seismic responses of aqueduct under earthquake excitation is performed with magneto rheological dampers. The results indicated that the magneto rheological dampers are effective in reducing the aqueduct response, the mitigation rate of semi-active control approaches with the active method The results from the present study may serve as a reference base for seismic design of large-scale aqueducts, and provide theoretical basis of aqueduct using semi-active devices.

Real-Time Hybrid Testing of a Steel-Structure Equipped With Large-Scale Magneto-Rheological Dampers Applying Semi-Active Control Algorithms

2008 ◽  
Author(s):  
Eunchurn Park ◽  
Sung-Kyung Lee ◽  
Heon-Jae Lee ◽  
Seok-Joon Moon ◽  
Hyung-Jo Jung ◽  
...  
Keyword(s):  
Real Time ◽  
Active Control ◽  
Large Scale ◽  
Mr Damper ◽  
Control Algorithms ◽  
Strong Nonlinearity ◽  
Control Force ◽  
Hybrid Testing ◽  
Mr Dampers ◽  
Comparison Results

This study introduces the quantitative evaluation of the seismic performance of a building structure equipped with MR dampers by using real-time hybrid testing method (RT-HYTEM). A real-scaled 5-story building is used as the numerical substructure, and MR dampers corresponding to an experimental substructure is physically tested by using UTM. First, the force required to drive the displacement of the story, at which the MR damper is located, is measured from the load cell attached to UTM. Then, the measured force is returned to a control computer to calculate the response of the numerical substructure. Finally, the experimental substructure is excited by UTM with the calculated response of the numerical substructure. The RT-HYTEM implemented in this study is validated for that the real-time hybrid testing results obtained by application of sinusoidal and earthquake excitations and the corresponding analytical results obtained by using the Bouc-Wen model as the control force of the MR damper respect to input currents were in good agreement. Furthermore, semi-active control algorithms were applied to the MR damper. The comparison results of experimental and numerical responses demonstrated that using RT-HYTEM was more reasonable in semi-active devices such as MR dampers having strong nonlinearity.

Research on Semi-Active Control of Large-Scale Aqueduct

2011 ◽  
Vol 194-196 ◽  
pp. 1997-2000
Author(s):  
Liang Huang ◽  
Bo Wang ◽  
Jian Guo Xu
Keyword(s):  
Active Control ◽  
Seismic Design ◽  
Theoretical Basis ◽  
Large Scale ◽  
Passive Control ◽  
Control Strategies ◽  
Active Method ◽  
Reference Base ◽  
Active Devices ◽  
Magneto Rheological

The magneto rheological damper (MRD) is employed to control the seismic response of large-scale aqueduct. The active control, semi-active control and passive control strategies are systematically compared, The results indicated that the magneto rheological dampers are effective in reducing the aqueduct response, the mitigation rate of semi-active control approaches with the active method The results from the present study may serve as a reference base for seismic design of large-scale aqueducts, and provide theoretical basis of aqueduct using semi-active devices.

scholarly journals On nonlinear dynamics of a parametrically excited pendulum using both active control and passive rotational (MR) damper

2017 ◽  
Vol 24 (9) ◽  
pp. 1587-1599 ◽  
Author(s):  
AM Tusset ◽  
FC Janzen ◽  
V Piccirillo ◽  
RT Rocha ◽  
JM Balthazar ◽  
...  
Keyword(s):  
Active Control ◽  
Chaotic Behavior ◽  
Control Strategies ◽  
Mr Damper ◽  
The Other ◽  
Parametric Uncertainties ◽  
Nonlinear Saturation ◽  
Saturation Control ◽  
Parametrically Excited ◽  
Pendulum Oscillation

This paper presents two control strategies for a parametrically excited pendulum with chaotic behavior. One of them considers active control obtained by nonlinear saturation control (NSC) and the other a passive rotational magnetorheological (MR) damper. Firstly, the active control problem was formulated in order to design the external torque for the pendulum, considering the NSC. Numerical simulations were carried out in order to show the effectiveness of this method for the active control of the pendulum oscillation. The ability of the control of the proposed NSC in suppression of the chaotic behavior, considering the proposed parameters, was tested by a sensitivity analysis to parametric uncertainties. In the case of the passive rotational MR damper, firstly the influence of the introduction of the MR in a pendulum was performed considering the 0-1 test. Different electric currents are applied to suppress the chaotic behavior of the system. The numerical results showed that the simple introduction of a passive rotational MR damper without electric current did not change the chaotic behavior of the system. However, it is possible to keep the pendulum oscillating with periodic behavior using the rotational MR damper with energizing discontinuity.

Performance Evaluation of Semi-Active Control With Magnetorheological Damper

2005 ◽  
Author(s):  
Shaopu Yang ◽  
Cunzhi Pan ◽  
Shuqi Guo
Keyword(s):  
Performance Evaluation ◽  
Time Delay ◽  
Vibration Isolation ◽  
Mechanical Response ◽  
Control Strategies ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Electromagnetic Response ◽  
Test Model ◽  
Isolation System

In this paper, a test model of a vibration isolation system with magnetorheological (MR) damper is introduced, and a simplified model using the time delay to describe the dynamic process of mechanical response and electromagnetic response for the MR damper is presented. Based on simulation, the performance evaluation with different control strategies, especially, the effects of time delay are investigated. The results show that the performance of the controlled system is highly dependent on the choice of the control strategies, and the effectiveness of semi-active on-off control is significantly determined by the time delay from the command current signal to the magnetic field of the MR damper.

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