Acoustic Transmission Characteristics and Optimum Design of the Wind Ducts of High-speed Train

doi:10.3901/JME.2018.24.129

Abstract

Abstract: The noise generated by the air conditioning system is one of the main noise sources of the stationary interior noise of high-speed train, and the improvement of acoustic transmission characteristics of the wind ducts are vital for the reduction of vibration and noise. The acoustic transmission loss model of a typical impedance duct structure of air conditioning system is established and analyzed based on hybrid method of finite element and statistical energy analysis(FE-SEA). The transmission characteristics of the duct between the frequencies of 100-3 150 Hz are calculated. And the reasons of peak and valley in the transmission loss curve are illustrated by calculating the acoustic modes based on the acoustic FE method. Furthermore, in order to improve the acoustic transmission loss of the air duct, the acoustic resistivity and resistance are optimized, including the selection of material, the number and position of sound absorption package. The results show that the optimization of acoustic absorbing material can improve the transmission loss by about 11.3 dB, and the optimization of the quantity and position of the absorption package can improve its transmission loss by 4.8 dB. The impedance composite optimization can improve the transmission loss by 15.6 dB. The conclusions can provide a reference for vibration and noise reduction of air conditioning system in high-speed train.

Key words: acoustic transmission loss, air conditioning system, high-speed train, hybrid FE-SEA method, interior noise, wind duct

CLC Number:

U270

SUN Yanhong, ZHANG Jie, HAN Jian, GAO Yang, XIAO Xinbiao. Acoustic Transmission Characteristics and Optimum Design of the Wind Ducts of High-speed Train[J]. Journal of Mechanical Engineering, 2018, 54(24): 129-137.

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