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Analysis of Vibro-acoustic Coupling Sound Field and Structure Vibration and Noise Isolation
FEI Chao-yang;CHEN Chang-zheng;ZHOU Bo;WANG Zhong
2012, 32 (2):
54-58.
DOI: 103969/j.issn.1006-1355-2012.02.013
Taking measured loads spectrum generated by blower unit pipeline as excitation source, the room sound field and its vibro-acoustic coupling condition at different frequency are simulated using ANSYS and Virtual Lab sound field simulating software. Simulation results show that vibro-acoustic coupling could be negligible below 400Hz, but the strong vibro-acoustic coupling is existed above 400Hz. The simulation results are consistent with actual measuring results. Through analyzing frequency bandwidth characteristics of loads spectrum and noise spectrum, the double-layer vibration isolation system with general damping vibration isolator and small middle mass is established and its vibration transmission coefficient is calculated. Vibration insulation and noise reduction effects are satisfactory.
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