Analysis of Sound Insulation Characteristics of Microperforated Profile Structure and Investigation of Influencing Factors
Focusing on the mid to low-frequency sound insulation of high-speed train profiles,the sound transmission loss under plane wave excitation when the upper panel,the stiffener are perforated separately and when both the upper panel and the stiffener simultaneously is investigated.Based on the finite element method,the finite element model of the micro-perforated profile is established in COMSOL,and the interaction of the acoustic structure and the internal viscosity heat loss after perforation are considered.The accuracy of the modeling method and simulation model is verified by comparing with the literature results.Compared with the unperforated profile,the perforation on the upper panel and the simultaneous perforation on both the upper panel and the stiffener both result in resonance peaks at the resonance frequencies,which has better sound insulation characteristics.The influences of perforation radius,perforation rate and perforation panel thickness on sound insulation characteristics of profiles are discussed.The results show that the resonance frequency of profiles gradually shifts to high frequency with the decrease of aperture and the increase of perforation rate,and the resonance frequency of profiles gradually shifts to low frequency with the increase of plate thickness.Perforation on both the upper panel and the stiffener has a lower resonant frequency than only on the upper panel.
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