Magneto-rheological elastomer (MRE) based composite structures for micro-vibration control  

作　　者：YQ Ni ZG Ying ZH Chen 

机构地区：[1]Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong, China [2]Department of Mechanics, Zhejiang University, Hangzhou 310027, China

出　　处：《Earthquake Engineering and Engineering Vibration》2010年第3期345-356,共12页地震工程与工程振动（英文刊）

基　　金：Research Grants Council of the Hong Kong Special Administrative Region,China Under Grant No.PolyU 5252/07E;The Hong Kong Polytechnic University through the Development of Niche Areas Programme Under Grant No.1-BB95;Zhejiang Provincial Natural Science Foundation of China Under Grant No.Y607087)

摘　　要：Magneto-rheological elastomers （MILEs） are used to construct composite structures for micro-vibration control of equipment under stochastic support-motion excitations. The dynamic behavior of MREs as a smart viscoelastic material is characterized by a complex modulus dependent on vibration frequency and controllable by external magnetic fields. Frequency-domain solution methods for stochastic micro-vibration response analysis of the MRE-based structural systems are developed to derive the system frequency-response function matrices and the expressions of the velocity response spectrum. With these equations, the root-mean-square （RMS） velocity responses in terms of the one-third octave frequency band spectrum can be calculated. Further, the optimization problem of the complex moduli of the MRE cores is defined by minimizing the velocity response spectra and the RMS velocity responses through altering the applied magnetic fields. Simulation results illustrate the influences of MRE parameters on the RMS velocity responses and the high response reduction capacities of the MRE-based structures. In addition, the developed frequency-domain analysis methods are applicable to sandwich beam structures with arbitrary cores characterized by complex shear moduli under stochastic excitations described by power spectral density functions, and are valid for a wide frequency range.Magneto-rheological elastomers （MILEs） are used to construct composite structures for micro-vibration control of equipment under stochastic support-motion excitations. The dynamic behavior of MREs as a smart viscoelastic material is characterized by a complex modulus dependent on vibration frequency and controllable by external magnetic fields. Frequency-domain solution methods for stochastic micro-vibration response analysis of the MRE-based structural systems are developed to derive the system frequency-response function matrices and the expressions of the velocity response spectrum. With these equations, the root-mean-square （RMS） velocity responses in terms of the one-third octave frequency band spectrum can be calculated. Further, the optimization problem of the complex moduli of the MRE cores is defined by minimizing the velocity response spectra and the RMS velocity responses through altering the applied magnetic fields. Simulation results illustrate the influences of MRE parameters on the RMS velocity responses and the high response reduction capacities of the MRE-based structures. In addition, the developed frequency-domain analysis methods are applicable to sandwich beam structures with arbitrary cores characterized by complex shear moduli under stochastic excitations described by power spectral density functions, and are valid for a wide frequency range.

关 键 词：magneto-rheological elastomer （MRE） micro-vibration control EQUIPMENT composite structure sandwich beam stochastic excitation 

分 类 号：O361.3[理学—流体力学] TQ174.758[理学—力学]