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

Active Publication Date: 2017-05-31
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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Problems solved by technology

Noise measurement of high-speed trains in acoustic wind tunnels presents great difficulties
[0003] Under current conditions, the measurement of far-field noise of high-speed trains mainly depends on line experiments, which are greatly affected by railway conditions and weather conditions, and the cost is high and the period is long

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  • Far-field noise measurement method of high-speed train module in acoustic wind tunnel
  • Far-field noise measurement method of high-speed train module in acoustic wind tunnel

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Embodiment Construction

[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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Abstract

The invention discloses a far-field noise measurement method of a high-speed train module in an acoustic wind tunnel. Three rows of microphones with adjustable heights are placed on the side face of the high-speed train module to measure the far-field noise of the high-speed train module. The measurement data is processed in the following steps of correcting effects of a vent cap of a far-field microphone; correcting air sound adsorption; and converting a sound pressure value of an actual measurement point in the wind tunnel into a measurement value of the position of the far-field microphone. Compared with the prior art, the beneficial effects of the measurement method are that based on precise measurement and correction of wind tunnel experiment data of the high-speed train module, real train results are deduced; in the development state of the high-speed train, an important guidance function is achieved for module de-noising design; and the measurement method is highly instructive and specific in the aspect of current train de-noising method evaluation.

Description

technical field [0001] The invention relates to a method for measuring far-field noise of a high-speed train model in an acoustic wind tunnel. Background technique [0002] Due to the complexity of the high-speed train model and its radiated noise, plus the reflection and interference of the train floor to simulate the ground. There are great difficulties in the noise measurement of high-speed trains in acoustic wind tunnels. [0003] Under current conditions, the measurement of far-field noise of high-speed trains mainly relies on line experiments, which are greatly affected by railway conditions and weather conditions, and the cost is high and the period is long. Contents of the invention [0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a far-field noise measurement method of a high-speed train model in an acoustic wind tunnel. [0005] The technical solution adopted by the present invention to solve its te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 郝南松龚小东唐道锋张俊龙田昊
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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