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.

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.

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.

Semi Active Control of Chaos in Systems Excited by Non-Ideal DC Motor

2011 ◽  
Vol 110-116 ◽  
pp. 5367-5372
Author(s):  
Saeed Farokhi ◽  
Aghil Yosefi Komma ◽  
Zohreh Bayat
Keyword(s):  
Active Control ◽  
Control Method ◽  
Mr Damper ◽  
Dc Motor ◽  
Viscous Damper ◽  
Control Of Chaos ◽  
Linear Spring ◽  
Chaotic Characteristic ◽  
Magneto Rheological ◽  
Active Control Method

In this paper, semi active control of non-ideal mechanical system with Magneto-Rheological (MR) damper is presented. The setup composed of a motor operating on a structure with mass M connected to a fixed frame by a non-linear spring and with a linear viscous damper. From the investigations carried out it is possible to observe the DC motor influence on the vibrating system along with non-periodic motions with chaotic characteristic. To control this system linear viscose damper is substituted by MR damper. A semi-active control method, sky-hook control is used in this study. Our results suggest that the addition of a MR damper turns the phase space smoother and it is so effective to suppress chaos.

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;

VIBRATION CONTROL OF STRUCTURES USING MAGNETO-RHEOLOGICAL DAMPERS WITH H∞ METHOD

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Huseyin Aggumus ◽  
Saban Cetin
Keyword(s):  
Applied Voltage ◽  
Mr Damper ◽  
Control Device ◽  
Damping Force ◽  
Earthquake Excitation ◽  
Active Device ◽  
Electromagnetic Coils ◽  
Robust Control Design ◽  
Magneto Rheological

In this study, the vibration mitigation of the structures under the earthquake excitation using magneto-rheological (MR) damper is researched. For this purpose, one MR damper is installed to an eight story structure and the system performance is investigated. MR damper is installed between the second floor and the ground. The MR damper is a semi-active control device that can be controlled by only the voltage transmitted to the electromagnetic coils. Since the MR damper is a semi active device, damping force can be changed by applied voltage. Therefore, determination of the applied voltage is important for vibration reduction. A robust controller is designed for determination of the MR damper voltage. H∞ method and model reduction approach are used for robust control design and application. The performance of the proposed method is tested by numerical simulation on the semi active structural system with MR damper. The performance of the control algorithm and the effect of the MR damper arrangement is evaluated using earthquake (El-centro earthquake) data. The results are compared with situations in which MR damper is not connected and when the MR damper is situation of semi-active controlled. The evaluations are based on the displacement and acceleration responses. The simulation results showed that the arrangement of the MR damper connected between the second floor and the ground is effective in reducing the vibration amplitudes.

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.

Magneto-Rheological (MR) Damper Modeling for Semi-Active Control Without Force Feedback

2012 ◽  
Author(s):  
Anria Strydom ◽  
Pieter S. Els ◽  
Sudhir Kaul
Keyword(s):  
Active Control ◽  
Ride Comfort ◽  
Mr Damper ◽  
Parametric Model ◽  
Model Parameters ◽  
Damping Force ◽  
Recursive Model ◽  
Online Identification ◽  
Handling Characteristics ◽  
Magneto Rheological

Ride comfort and handling characteristics are two important aspects of vehicle dynamics that generally require contrasting suspension settings. Different damper settings of the suspension system are required in order to meet these conflicting requirements. A magneto-rheological (MR) damper allows variable suspension settings to achieve enhanced ride comfort as well as handling characteristics by providing adaptable damping. Implementation of semi-active control requires an accurate MR damper model and online identification of model parameters. However, modeling a MR damper for a wide range of input conditions is challenging, especially when there are constraints on necessary measurements that are required for modeling. Although the available literature proposes various parametric models, many of these models are computationally expensive and are not viable for online identification. This paper presents a non-parametric model as well as a recursive model to predict the damping force of a MR damper in order to implement a semi-active control algorithm on an off-road vehicle. The results of the two models are compared to a conventional parametric model. The recursive model is used to demonstrate the significance of including the measured damping force in the model. Whereas the availability of the measured damping force yields a reasonably accurate model, the lack of measured damping force significantly impairs the recursive model.

Stochastic optimal semi-active control of stay cables by using magneto-rheological damper

2010 ◽  
Vol 17 (13) ◽  
pp. 1921-1929 ◽  
Author(s):  
M Zhao ◽  
WQ Zhu
Keyword(s):  
Active Control ◽  
Control Strategy ◽  
Mr Damper ◽  
Stochastic Averaging ◽  
Control Law ◽  
Control Force ◽  
Stay Cable ◽  
Dynamical Programming ◽  
Magneto Rheological ◽  
Bang Bang Control

Stochastic optimal semi-active control for stay cable multi-mode vibration attenuation by using magneto-rheological (MR) damper is developed. The Bingham model for an MR damper is used. The force produced by an MR damper is split into passive and active parts. The passive part is combined with structural damping forces into effective damping forces. The partially averaged Itô stochastic differential equations for controlled modal energies are derived by applying the stochastic averaging method for quasi-integrable Hamiltonian systems. Then the dynamical programming equation for controlled modal energies with an index involving control force is established by applying the stochastic dynamical programming principle, and a stochastic optimal semi-active control law is obtained by solving the dynamical programming equation. For controlled modal energies with an index not involving control force, bang-bang control law is obtained without solving a dynamical programming equation. A comparison between the two control laws shows that the stochastic optimal semi-active control strategy is superior to the bang-bang control strategy in the sense of higher control effectiveness and efficiency and less chattering.

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