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Optimizing control of a two-span rotor system with magnetorheological fluid dampers

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Journal of Beijing Institute of Technology 2015年第4期24卷 558-565页

作者：邢健何立东王锎黄秀金 Engineering Research Center of Chemical Technology Safety Ministry of EducationBeijing University of Chemical Technology

A control system aims at vibration reduction in a two-span rotor system with two shear mode magnetorheological （MRF） dampers is designed. A finite element model of the MRF damper- rotor system is built and used to analyze the rotor vibration characteristics. Based on Hooke and Jeeves algorithm and the numerical simulation analysis, an optimal appropriate controller is proposed and designed. Experimental results show that rotor vibration caused by unbalance is well controlled （ first critical speed region 37% , second critical speed region 42% ）. To reflect advantages of optimi- zing strategy presented and validate the intelligent optimization control technology, detailed experi- ments were developed on a two-span rotor-vibration-control platform. The influence on accuracy, rapidity and stability of optimizing control for rotor vibration are analyzed. It provides a powerful technical support for the extension and application in target and control for shafting vibration.

关键词： magnetorheological fluid damper two-span rotor Hooke and Jeeves optimizing con-trol vibration reduction

Research on low-frequency mechanical characteristics of the MR dampers in ship isolators

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Journal of Marine Science and Application 2008年第4期7卷 243-247页

作者：姚熊亮田正东沈志华郭绍静 College of Shipbuilding Engineering Harbin Engineering University

A new isolator composed of a steel rope spring and a magneto-rheological(MR) damper was designed and a study on low-frequency mechanical characteristics of MR dampers in isolators was carried *** used the characteristics of the MR damper,such as fast response,controllable damping,small energy consumption,wide dynamic scope,and great *** relationships between MR damping forces and influencing factors were analyzed based on experimental *** results show that damping force is not only related to structural dimensions,but also closely related to controllable current and vibration ***,the empirical formula for damping forces was corrected,and the relationship between correction coefficients and factors analyzed.

关键词： ship isolator magnetorheological fluid magnetorheological fluid damper low-frequency mechanical characteristics

A Blast Shock Isolation System with MRFD and Its Semi-Active Control Analysis

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Transactions of Tianjin University 2006年第B9期12卷 65-69页

作者： LIU Jingbo WANG Libin DU Yixin WANG Yan Department of Civil Engineering Tsinghua University Beijing 100084 China

To effectively reduce the damage to people and devices in civil defense engineering subjected to blast shock, a blast shock isolation system with magnetorheological fluid dampers (MRFD) is proposed. MRFD can provide continuously adjustable Coulomb friction and has many advantages for semi-active control. Numerical simulation of this isolation system is finished using Matlab simulink toolbox. General semi-active control algorithms are consided based on instantaneous optimal active control algorithm. And the results indicate that the shock isolation system can work efficiently, decreasing about 93% of the peak acceleration of the isolation floor.

关键词： blast shock isolation magnetorheological fluid damper semi-active control simulink

Research on the dynamic performance of ship isolator system that use magnetorheological dampers

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Journal of Marine Science and Application 2009年第4期8卷 291-297页

作者： DENG Zhong-chao YAO Xiong-liang ZHANG Da-gang 邓忠超姚熊亮张大刚 College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China 哈尔滨工程大学深海工程技术研究中心黑龙江哈尔滨150001

Isolator systems on ships should ideally be able to simultaneously reduce low frequency vibration response and high frequency shock response. Conventional isolator systems are unable to do so To solve the problem, a new style isolator system was created. This isolator system consists of a steel coil spring component and a magnetorheological （MR） damper component working in parallel. Experiments on this isolator system were carried out, including tests of vibration reduction and shock resistance. The vibration load frequencies were set from 1-15 Hz, and force amplitudes from 2.94-11.76kN. The maximum shock input acceleration was 20 g, and impulse width was lores. Both the vibration and shock loads were applied using MTS Systems Corporation＇s hydraulic actuators. The experimental results indicated that the isolator system performs well on system vibration response, with resonance humps of the vibration response obviously reduced after using the MR damper. For the shock experiment, the attenuation of shock response was much faster with increased MR damping. The MR damper＇s effect on shock moments was very different from its performance in vibration mode. The correlation between MR force and control current was not as evident as it was during vibration loads.

关键词： magnetorheological fluid damper vibration reduction shock resistance isolator