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Wind tunnel background noise correction method for rotating blade sound signal extraction

A sound signal, rotating blade technology, applied in the field of background noise correction, can solve the problems of signal synchronization average result deterioration, acoustic measurement result error, etc., to achieve the effect of eliminating the result deterioration and improving the signal-to-noise ratio

Pending Publication Date: 2022-02-25
成都流体动力创新中心
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Problems solved by technology

When signal processing methods such as time-domain synchronous averaging are used to extract periodic acoustic signals with wind tunnel background noise, due to the existence of phase differences, the results of synchronous averaging of signals in multiple time segments will deteriorate, which will bring more serious problems to the acoustic measurement results. large error (see figure 2 )

Method used

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  • Wind tunnel background noise correction method for rotating blade sound signal extraction
  • Wind tunnel background noise correction method for rotating blade sound signal extraction
  • Wind tunnel background noise correction method for rotating blade sound signal extraction

Examples

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Embodiment 1

[0074] Carry out the aerodynamic noise test of the helicopter rotor model in the acoustic wind tunnel. The diameter of the rotor model blade is 2 meters. The wind speed is 54m / s; during the test, the atmospheric temperature is 11°C and the pressure is 96.2kPa. The rated speed of the rotor is 2064r / min, and it is configured with 5 blades.

[0075] A method for correcting wind tunnel background noise for extracting sound signals of rotating blades, comprising the following steps:

[0076] Step 1: Install the rotor model in the core jet flow area of ​​the wind tunnel test section. The exposed device of the rotor test bench is wrapped with a diversion shell, and 5mm thick sound-absorbing cotton is pasted on the shell and tensioned. The arrangement of the microphones is as follows figure 1 As shown, the hollow circle is the layout point of type I microphone ( figure 1 The reference numbers 1 to 23 in the middle), the solid circle is the type II microphone arrangement point ( fi...

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Abstract

The invention discloses a wind tunnel background noise correction method for rotating blade sound signal extraction. When the method is applied, pneumatic sound signals of a rotating mechanical power type aircraft model in a wind tunnel can be accurately obtained. The problem that when periodic sound signals with wind tunnel background noise are extracted through signal processing methods such as time domain synchronous averaging and the like, due to the existence of phase differences, signal synchronous averaging results in a plurality of time segments will deteriorate, and consequently large errors are brought to acoustic measurement results is solved.

Description

technical field [0001] The invention relates to the field of aeroacoustics, in particular to the background noise correction technology in the sound signal extraction process. Background technique [0002] General-purpose helicopters, regional business jets, transport aircraft and other aircraft are mostly powered by rotating machinery such as rotors and propellers, which will generate strong aerodynamic noise during high-speed rotation, and the noise will seriously affect the comfort of the aircraft and the safety of residents near the route. working life. The International Civil Aviation Organization has described the noise limits of the third and fourth stages of the airworthiness certification of various types of aircraft in Volume 1 of ICAO Annex 16. New models with noise that do not meet the standards will not be able to obtain airworthiness certificates, thus Inability to enter the international market. Therefore, this type of aircraft must focus on solving the aero...

Claims

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Application Information

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IPC IPC(8): G01M9/02G01M9/08B64F5/60
CPCG01M9/02G01M9/08B64F5/60Y02E10/72
Inventor 张军陈正武张俊龙雷红胜
Owner 成都流体动力创新中心
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