Sound radiation characteristics and noise reduction measure of a traction transformer used in the municipal train

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (2) : 334-342.

HUANG Jiacheng1 ， XIAO Xinbiao1 ， WANG Qi1 ， DU Xing2 ， ZHOU Shunyuan1 ， DU Yelin3

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Abstract

In order to study the influence of traction transformer on the interior noise of municipal train. In this thesis, the multi-physical field coupling model of electromagnetic field-structural force field-pressure sound field of traction transformer and the simulation model of vehicle interior noise are established. The effectiveness of the traction transformer and the car body simulation model is verified by the transformer radiation test and the interior noise test respectively. The noise simulation model of traction transformer considers the anisotropy of core material and the nonlinearity of magnetostrictive. The interior noise simulation model considers the structural characteristics of the car body. In order to reduce the influence of transformer on vehicle interior noise. According to the radiation noise generation mechanism and field test results of traction transformer, noise reduction measures are proposed from two aspects of transformer structure and electromagnetic parameters. Based on the established transformer and vehicle noise simulation model, the noise reduction measures are simulated and analyzed. The results show that the noise reduction effect is the most obvious when the core stiffness increases by 60% and the magnetic flux density decreases by 10%. The total noise in the vehicle is reduced by 8.2 dBA and 4.4 dBA respectively. Reducing the core flux density has an inhibitory effect on noise in the range of 50 ~ 5000 Hz. The noise reduction scheme of 80 % and 60 % increase of vertical clamp stiffness and transverse clamp stiffness can also effectively reduce the total radiated noise of traction transformer, but it can only suppress the noise in a certain frequency range.

Key words

municipal train / traction transformer / sound radiation / interior noise / noise reduction

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HUANG Jiacheng1,XIAO Xinbiao1,WANG Qi1,DU Xing2,ZHOU Shunyuan1,DU Yelin3. Sound radiation characteristics and noise reduction measure of a traction transformer used in the municipal train[J]. Journal of Vibration and Shock, 2024, 43(2): 334-342

References

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