Far-field noise measurement method of high-speed train module in acoustic wind tunnel
A high-speed train, noise measurement technology, applied in measurement devices, machine/structural component testing, aerodynamic testing, etc., can solve the problems of high cost, difficult noise measurement, long cycle, etc., to achieve strong guidance and pertinence Effect
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[0013] A far-field noise measurement method of a high-speed train model in an acoustic wind tunnel, mainly including equipment arrangement and data processing method.
[0014] According to the requirements of the field standard, the measurement position is 25m away and 3.5m high. If it is just a simple scaling, the measurement position will enter the jet boundary layer of the wind tunnel and cannot be measured.
[0015] Therefore, the following measurement location is selected, estimated according to the main frequency of train aerodynamic noise at 200 Hz, the radiation wavelength is 1.7 meters, and the measurement location needs to be 5.1 meters away according to 3 times the far field. The measurement height is calculated according to the radiation noise angle of the model, and the height of 0.4m is taken.
[0016] According to the data processing method, the sound pressure value of the actual measurement point in the wind tunnel is converted to the measurement position requi...
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