scholarly journals Semiactive Vibration Control Using a Magnetorheological Damper and a Magnetorheological Elastomer Based on the Bouc-Wen Model

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Wei Zhu ◽  
Xiao-ting Rui
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Magnetorheological Damper ◽  
Hysteretic Behavior ◽  
Magnetorheological Elastomer ◽  
New Approach ◽  
System A ◽  
In Series ◽  
Reduction Effect

A vibration control system is put forward using a magnetorheological damper (MRD) and a magnetorheological elastomer (MRE) connected in series. In order to model the hysteresis of the MRD, a Bouc-Wen model and a corresponding parameter identification method are developed for the MRD. The experimental results validate the proposed Bouc-Wen model that can predict the hysteretic behavior of the MRD accurately. The role of the MRE is illustrated by an example of a single degree-of-freedom system. A semiactive vibration control strategy of the proposed vibration control system is proposed. To validate this new approach, experiments are conducted and the results highlight significantly improved vibration reduction effect of the proposed vibration control system than the vibration control system only using the MRD.

Quenching of Self-Excited Vibrations

1989 ◽  
Vol 111 (2) ◽  
pp. 130-133 ◽  
Author(s):  
K. R. Asfar
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Van Der Pol Oscillator ◽  
Van Der Pol ◽  
Passive Vibration Control ◽  
First Order ◽  
System A ◽  
Excited System ◽  
Excited Vibration ◽  
First Order Perturbation

A passive vibration control system for the quenching of undesirable self-excited vibrations in mechanical systems is presented. The system is a Lanchester damper, attached to the main self-excited system; a van der Pol oscillator. A first-order perturbation solution shows that complete quenching of self-excited vibration is possible. The result is verified by numerical integration of the governing differential equations. Furthermore, the damper is shown to be effective in suppressing forced self-excited vibrations.

scholarly journals Arc-Surfaced Frictional Damper for Vibration Control in Container Crane

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Gongxian Wang ◽  
Yang-Yang Wang ◽  
Jianming Yuan ◽  
Yi Yang ◽  
Dong Wang
Keyword(s):  
Control System ◽  
Time History ◽  
Seismic Energy ◽  
Hysteretic Behavior ◽  
Container Crane ◽  
System A ◽  
History Analysis ◽  
Structural Responses ◽  
Dynamic Time ◽  
Displacement Model

In this paper, a new arc-surfaced frictional damper (AFD) is proposed and its hysteretic behavior is experimentally studied. Then the device is applied to container crane based on a seesaw mechanism. The major advantage of the seesaw damping system is that the long tension cables can be utilized as bracing between the seesaw member and the portal legs to avoid compression and buckling of the cables. A simplified trilinear force-displacement model on the basis of experimental results is adopted to represent the hysteretic behavior of AFD. After that, seismic responses of container crane with and without dampers to four earthquakes are studied using nonlinear dynamic time-history analysis. Besides this system, a diagonal-brace-AFD system is studied for comparison. A method based on the displacement and energy dissipation ratio is proposed to find the optimum slip force for seesaw damping system. Performance of AFD control system is assessed though various parameters including displacement and maximum portal frame drift angle. Results prove a feasible application of AFD control system to absorb large amounts of seismic energy and significantly reduce the structural responses.

Design of Suspension Vibration Control System Based on ON-OFF Algorithm

2012 ◽  
Vol 482-484 ◽  
pp. 1213-1217
Author(s):  
Jie Yue ◽  
Jin Qiu Zhang ◽  
Yong Qiang Gao ◽  
Zhi Zhao Peng ◽  
Zhi Tao Shi
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Suspension System ◽  
Signal Design ◽  
Single Chip ◽  
Control Effect ◽  
Damping Force ◽  
System A ◽  
Vehicle Suspension System ◽  
Control Accuracy

Aimed to satisfy damping force change requirement of vehicle MRF suspension vibration control system, a controller of MRF suspension system based on On-Off control algorithm is designed, and a control system is carried out. The system takes single chip AT90CAN128 which obey the CAN bus protocols as micro-controller, and it accomplish AD conversion of sensor signal, design of On-Off algorithm and output of PWM voltage power control signal. The system also is used in vibration control experiment of tracklayer vehicle suspension system. The experiment shows that the controller can improve control accuracy, and the control effect is obviously.

Multi-Purpose Model of SOFC Hybrid Systems

2008 ◽  
Author(s):  
Francesco Ghigliazza ◽  
Alberto Traverso ◽  
Mario L. Ferrari ◽  
John Wingate
Keyword(s):  
Control System ◽  
Real Time ◽  
Hybrid System ◽  
Dynamic Modelling ◽  
Control System Design ◽  
New Approach ◽  
System A ◽  
And Control ◽  
Direct Use ◽  
Application Specific

The Multi-Purpose Model represents a new methodology for developing model based tools for control system design and verification. The Multi-Purpose Model, as described in this paper, simulates a SOFC hybrid system — a challenging and innovative application of dynamic modelling and control. Real-time modelling is a recognised approach to monitor advanced systems and to improve control capabilities. Applications of Real-Time (RT) models are commonly used in the automotive and aerospace fields. Starting from existing TRANSEO components and models, a new approach to fit hybrid system application has been developed. Original C-based models have been translated into embedded Matlab functions for direct use within Matlab-Simulink. The resulting models have then been used to autogenerate c-code with the Real-Time Workshop. The C-code has then been compiled to produce application specific executables.

scholarly journals Experimental analysis of vibration control algorithms applied for an off-road vehicle with magnetorheological dampers

2018 ◽  
Vol 37 (3) ◽  
pp. 619-639 ◽  
Author(s):  
Piotr Krauze ◽  
Jerzy Kasprzyk ◽  
Andrzej Kozyra ◽  
Jaroslaw Rzepecki
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Experimental Analysis ◽  
Ride Comfort ◽  
Inverse Model ◽  
Velocity Estimation ◽  
Magnetorheological Damper ◽  
Control Algorithms ◽  
Magnetorheological Dampers ◽  
Road Vehicle

The paper presents an experimental analysis of the selected feedback vibration control schemes dedicated to magnetorheological dampers, related to ride comfort and road holding. They were applied in a complex vibration control system installed in a commercially available off-road vehicle. Original shock-absorbers of the vehicle were replaced with magnetorheological dampers. The control system takes advantage of numerous sensors installed in the vehicle tracking its motion, i.e. accelerometers, suspension deflection sensors (linear variable differential transformer) and IMU module. Vibration control algorithms: Skyhook, PI, and Groundhook were tested experimentally using mechanical exciters adapted for diagnosis of a vehicle suspension system. Since the presented semi-active vibration control requires the magnetorheological damper inverse model to be applied, accurate operation of this model significantly influences the quality of vibration control. Therefore, additional analysis was related to application of measurements from accelerometers or suspension deflection sensors in the inverse model. Presented variants of control algorithms were compared by means of transmissibility characteristics evaluated in the frequency domain as well as using ride-comfort- and driving-safety-related quality indices. It was confirmed that the Skyhook control as well as PI improved ride comfort, whereas Groundhook control improved road holding and decreases vibration of the wheels. Furthermore, it was shown that both approaches to the relative velocity estimation, based on accelerometers and linear variable differential transformers, can be used in this application. However, the first solution gives better results in the case of the Skyhook and PI control, whereas application of LVDT sensors is better for the Groundhook algorithm.

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