Experimental Studies on Semi-Active Vibration Control of Jacket Platforms With Magnetorheological Damper

2009 ◽  
Author(s):  
Chunyan Ji
Keyword(s):  
Vibration Control ◽  
Model Experiment ◽  
Active Vibration Control ◽  
Experimental Studies ◽  
Similarity Criterion ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Control Effect ◽  
Jacket Platform ◽  
Active Vibration

Jacket platforms are inevitably undergoing the environmental loads such as wind, waves, current, ice and earthquake etc., which will induce continuous vibration of the platforms. The vibration, on one hand, will cause fatigue damage, decreasing the platform’s reliability; on the other hand, the excessive vibration can’t satisfy the basic psychological requirements of the personnel. In order to reduce the excessive vibration of jacket platforms effectively, many control strategy and control equipments are proposed and studied. In the present study, a model experiment is designed to investigate the effectiveness of semi-active vibration control system with Magnetorheological (MR) Damper. A typical jacket offshore platform in Mexico Gulf is selected as experimental prototype. The model of the jacket platform is designed based on dynamical similarity criterion by the scale of 1:50. Furthermore, the optimal semi-active system of MR damper is designed by fuzzy control theory. In order to investigate the control effect of MR damper on the jacket platform under regular and random wave state, several model experiment load cases are performed. The experimental results show that the MR system designed by fuzzy theory can reduce the vibration of the platform effectively and in the same time the control effect is stable.

Experimental Study on Performance Characteristics of Magnetorheological Damper

2010 ◽  
Vol 37-38 ◽  
pp. 439-443 ◽  
Author(s):  
Zhen Ning Hou ◽  
Zhi Min Feng ◽  
Hai Gang Hu ◽  
Guang Bin Wu
Keyword(s):  
Experimental Study ◽  
Vibration Control ◽  
Dynamic Testing ◽  
Active Vibration Control ◽  
Mr Damper ◽  
Performance Characteristics ◽  
Magnetorheological Damper ◽  
Structural Vibration ◽  
Structural Vibration Control ◽  
Active Vibration

MR dampers are new kind of the most promising devices for structural vibration control. In this paper, an overview of the structure and working principle of shear-valve mode magnetorheological (MR) damper is given. An experimental study was carried out to test the performance characteristics of a shear-valve mode MR damper, its dynamic testing was performed on a Material Testing System (MTS) under sinusoidal and triangle excitation. Based on experimental data, the dynamic characteristics, energy dissipation and dynamic response time were analyzed. The present work lays down a foundation for MR damper application in the semi-active vibration control system.

Optimal Placement of Piezoelectric Sensors and Actuators for Controlled Flexible Linkage Mechanisms

2005 ◽  
Vol 128 (2) ◽  
pp. 256-260 ◽  
Author(s):  
Xianmin Zhang ◽  
Arthur G. Erdman
Keyword(s):  
Vibration Control ◽  
Simulation Analysis ◽  
Active Vibration Control ◽  
Optimal Placement ◽  
Control Effect ◽  
Sensors And Actuators ◽  
Piezoelectric Sensors And Actuators ◽  
Active Vibration ◽  
Flexible Mechanism ◽  
Flexible Linkage

The optimal placement of sensors and actuators in active vibration control of flexible linkage mechanisms is studied. First, the vibration control model of the flexible mechanism is introduced. Second, based on the concept of the controllability and the observability of the controlled subsystem and the residual subsystem, the optimal model is developed aiming at the maximization of the controllability and the observability of the controlled modes and minimization of those of the residual modes. Finally, a numerical example is presented, which shows that the proposed method is feasible. Simulation analysis shows that to achieve the same control effect, the control system is easier to realize if the sensors and actuators are located in the optimal positions.

Semi-active Vibration Control with non-linear model of MR Damper

2004 ◽  
Vol 2004.6 (0) ◽  
pp. 261-262
Author(s):  
Takashi TAKAHSI ◽  
Shinya Soma ◽  
Toru WATANABE ◽  
Kazuto SETO
Keyword(s):  
Vibration Control ◽  
Linear Model ◽  
Active Vibration Control ◽  
Mr Damper ◽  
Non Linear ◽  
Active Vibration

Experimental Study on Active Vibration Control of Flexible Manipulator Based on Improved PPF Algorithm

2014 ◽  
Vol 989-994 ◽  
pp. 2774-2777
Author(s):  
Fei Du ◽  
Tian Bing Ma
Keyword(s):  
Experimental Study ◽  
Vibration Control ◽  
Active Vibration Control ◽  
Flexible Manipulator ◽  
Experimental Result ◽  
Work Efficiency ◽  
Control Effect ◽  
Positioning Accuracy ◽  
Active Vibration ◽  
Modal Vibration

The positioning accuracy and work efficiency of flexible manipulator is seriously affected by its vibration. Therefore, vibration control of single joint flexible manipulator is studied by using an improved PPF algorithm based on LabVIEW and piezoelectric technology. Firstly, the improved PPF algorithm principle is introduced. Then, the experiment process is discussed in detail. Experimental result shows that the improved PPF algorithm can effectively control the first two modal vibration of flexible manipulator. The control effect is close to 14 dB and improved nearly 4.5 dB compared with PPF algorithm.

Experimental studies on active vibration control of smart plate using a modified PID controller with optimal orientation of piezoelectric actuator

2014 ◽  
Vol 22 (11) ◽  
pp. 2619-2631 ◽  
Author(s):  
Aleksandar M Simonović ◽  
Miroslav M Jovanović ◽  
Nebojša S Lukić ◽  
Nemanja D Zorić ◽  
Slobodan N Stupar ◽  
...  
Keyword(s):  
Vibration Control ◽  
Piezoelectric Actuator ◽  
Pid Controller ◽  
Active Vibration Control ◽  
Experimental Studies ◽  
Optimal Orientation ◽  
Active Vibration

Research on active vibration control of flexible wing based on MFC actuator

2020 ◽  
Vol 64 (1-4) ◽  
pp. 565-571
Author(s):  
Yajun Luo ◽  
Fengfan Yang ◽  
Linwei Ji ◽  
Yahong Zhang ◽  
Minglong Xu ◽  
...  
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Torsional Vibration ◽  
Fiber Composite ◽  
Active Vibration Control ◽  
Current Control ◽  
Control Effect ◽  
Flexible Wing ◽  
Control Scheme ◽  
Active Vibration

An active vibration control scheme was proposed based on Macro Fiber Composite (MFC) actuators for the bending and torsional vibration control of large flexible lightweight wing structures. Firstly, a finite element modeling and modal analysis of a flexible wing are carried out. Further, the number, type, and location distribution of the MFC actuators bonded on the supported beam of the wing are designed. Then, the actuated characteristics of the two kinds of MFC actuators required for bending and torsional vibration controls was theoretically analyzed. The simulation model of the overall vibration control system was also finally obtained. Finally, through ANSYS simulation analysis, the vibration control effect of the current control system on the first two-order low-frequency modal response of the wing structure is given. The simulation results show that the proposed active vibration control scheme has specific feasibility and effectiveness.

Active Control by Piezoelectric Material Applied to Dynamic Analysis for Suppression of Panel with Uncertain Parameters

2013 ◽  
Vol 431 ◽  
pp. 301-305 ◽  
Author(s):  
Bo Fang ◽  
Guo Qing Jiang ◽  
Ye Wei Zhang ◽  
Jian Zang
Keyword(s):  
Vibration Control ◽  
Active Control ◽  
Active Vibration Control ◽  
Composite Panel ◽  
Uncertain Parameters ◽  
Analysis Method ◽  
Control Effect ◽  
Interval Analysis Method ◽  
Active Vibration ◽  
Air Speed

This paper studied the dynamic suppression problems of active control of composite panel with uncertain parameters. Considering uncertain factors of panel, finite element vibration dynamic model is established for active vibration control, through interval analysis method to estimate panel in active control of vibration critical air speed and flutter amplitude, to this determined active suppression effects of panel, numerical simulation indicate that through with Piezoelectric patches as active vibration control, the panel with uncertain parameters of whole interval of vibration critical wind speed were changed from vibration to convergence, showing that the control effect was significant.

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