Optimization design of low-frequency silencing structure based on acoustic-electric analogy

被引：0
|
作者：
Li Q. [1 ]
Wang X. [1 ]
Mei Y. [2 ]
机构：
[1] School of Mechanical Engineering, Dalian University of Technology, Dalian
[2] School of Automotive Engineering, Dalian University of Technology, Dalian
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 03期
关键词：
acoustic structure; acoustic-electric analogy; finite element simulation; simulated annealing; transfer matrix method; transmission loss;
D O I：
10.13465/j.cnki.jvs.2024.03.024
中图分类号：
学科分类号：
摘要：
Here, based on acoustic-electric analogy, a low-frequency silencing structure with similar performance to an electric filter was designed, and an optimization design strategy for acoustic structure was constructed by combining transfer matrix method and simulated annealing method. Firstly, using the normalization method, based on the fourth order Chebyshev high pass filter, an electrical band-stop filter was designed. Then, based on acoustic-electric analogy, inductance and capacitance in a circuit were converted into tubules and cylindrical cavities in an acoustic structure, and a prototype of silencing structure was constructed. Its mathematical model was established using transfer matrix method to derive the expression of sound transmission loss. Finally, combining mathematical model of acoustic structure and simulated annealing method, taking maximizing effective attenuation bandwidth as the objective and size parameters of silencing structure as variables, the optimization design was performed for the prototype structure. The results showed that based on acoustic-electric analogy, a reasonable prototype of silencing structure can be obtained to overcome the limitation of relying solely on classical silencing structure for design; combining the derived transmission loss mathematical model and simulated annealing method, parametric optimization is performed for silencing structure prototype to significantly improve its silencing effect, its bandwidth with transmission loss exceeding 20 dB is widened to 410-2165 Hz which is 202% of the bandwidth before optimization; especially, the optimized structure overcomes the defect of the prototype structure being unable to realize effective silencing in the frequency range of 466 - 537 Hz and obtains a continuous large-span effective bandwidth, and the average increase in transmission loss curve reaches 22. 8%. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：201 / 208
页数：7
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