Noise source positioning method of high-speed train module in acoustic wind tunnel

Abstract

The invention discloses a noise source positioning method of a high-speed train module in an acoustic wind tunnel. The method comprises steps of carrying out rapid Fourier transformation on each matrix element in a cross spectrum formed by a microphone array; calculating a pointing vector of an array for any one scanning point near a scanning panel of an acoustic test module; calculating a output power spectrum of the array for each scanning point; and calculating a noise amplitude value in any requirement scanning face, thereby obtaining a noise source graph of the high-speed train module in the acoustic wind tunnel. Compared with the prior art, the beneficial effects of the positioning method are that the pneumatic noise source position of the high-speed train module can be precisely and quickly positioned, and a sound source propagation path can be precisely given in a large acoustic wind tunnel; wind drift distance is corrected without calibration of a noise source; the result of the positioning method is more precise and reliable than numerical simulation; the cost is quite low and the efficiency is quite high compared with real train measurement; and the positioning method is free from restrictions like the railway landform, environment and weather.

Description

technical field [0001] The invention relates to a method for locating a noise source of a high-speed train model in an acoustic wind tunnel. Background technique [0002] In acoustic wind tunnels, microphone array frames are generally used to locate noise sources. Because the train model is a slender body, coupled with the complexity of the train model, and the floor device simulating the ground, reflections and other disturbances are produced on the sound radiation. Therefore, the location of the noise source of the high-speed train has brought new difficulties and challenges. [0003] Existing research on the location of aerodynamic noise sources of high-speed trains is mainly based on numerical calculations and real vehicle measurements. The accuracy of numerical calculations in simulating turbulent details has always been based on experiments, while real vehicle measurements are performed when the train is moving, and the measurement equipment is fixed, so there is a D...

AI Technical Summary

Problems solved by technology

Because the train model is a slender body, coupled with the complexity of the train model, and the floor device that simulates the ground, it will cause reflection and other interference to the sound radiation

Therefore, the location of the noise source of the high-speed train has brought new difficulties and challenges

[0003] Existing research on the location of aerodynamic noise sources of high-speed trains is mainly based on numerical calculations and real vehicle measurements. The accuracy of numerical calculations in simulating turbulent details has always been based on experiments, while real vehicle measurements are performed when the train is moving, and the measurement equipment is fixed, so there is a Doppler effect

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