The attenuation domain characteristics of the periodic foundation with different parameters are analyzed by using COMSOL Multiphysics,and the attenuation and blocking effects of periodic foundation on machine vibration wave are discussed.Using commercial finite element software ABAQUS,the finite element model of periodic foundation machine vibration was established.The frequency domain analysis of periodic foundation model with different thickness and materials was car-ried out,and the frequency dispersion relationship of periodic foundation was obtained.The dynamic response and vibration attenuation effect of periodic foundation machine were studied by time history analysis.The results show that the dynamic response of the upper machine can be reduced effectively when the frequency of the input wave is within the band gap of the periodic foundation frequency.When the main frequency of the input wave is outside the band gap of the periodic foundation frequen-cy,the dynamic response of the upper machine cannot be reduced.The band gap of the periodic foun-dation of different thicknesses and materials and the damping effect on the vibration of the upper ma-chine are different.This study provides a new idea and method for the application of periodic founda-tion in machine vibration reduction of industrial buildings.
关键词
振动衰减/声子晶体理论/周期性基础/频率带隙/时程分析
Key words
vibration attenuation/phononic crystal theory/periodic foundation/frequency band gap/time history analysis
维普
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