Magneto-rheological elastomer (MRE) based composite structures for micro-vibration control |
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Authors: | YQ Ni ZG Ying ZH Chen |
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Institution: | 1. Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China 2. Department of Mechanics, Zhejiang University, Hangzhou 310027, China |
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Abstract: | Magneto-rheological elastomers (MREs) 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. |
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Keywords: | magneto-rheological elastomcr (MRE) micro-vibration control equipment composite strueture sandwich beam stochastic excitation |
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