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Engine noise test method

A technology for noise testing and engines, applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of a large number of sensors, unintuitive results, and increased test costs, so as to reduce the number of drives, accurate data, and save energy The effect of testing fees

Active Publication Date: 2014-08-20
SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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AI Technical Summary

Problems solved by technology

[0005] 2) The cumulative number of sensors used is large;
[0006] 3) Repeated driving of the engine increases the test cost;
[0007] 4) The test results only give the sound pressure level of each row of microphones, but fail to give the cloud map of the noise field, and the results are not intuitive

Method used

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Embodiment Construction

[0025] The specific implementation of this method is as follows:

[0026] 1) Using the CFD numerical analysis method, the engine noise field is simulated to obtain the approximate distribution of the noise field;

[0027] 2) Determine the location and quantity of sensors. According to the numerical analysis results, the gradient of the noise field behind the aircraft side changes greatly, so more microphones need to be arranged in this area, a total of 23 microphones are arranged; the noise field gradient changes little behind the aircraft side, therefore, the microphones in this area It can be arranged sparsely, with a total of 12 microphones arranged, such as figure 1 shown;

[0028] 3) Select a data acquisition system and data acquisition software that is reliable and suitable for field testing, connect each microphone to the data acquisition system with a test cable, modify the sensitivity of each microphone in the data acquisition software, and use a standard sound sour...

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Abstract

The invention belongs to the field of airplane vibration and noise, and relates to an engine noise test technology. The engine noise test technology comprises measuring point optimization arrangement, multichannel data simultaneous acquisition and cloud method data post processing. The measuring point optimization arrangement enables important noise information of an engine noise field to be captured by use of quite few microphones; the multichannel data simultaneous acquisition ensures the accuracy of acquisition data; and the cloud method data post processing can enable the noise distribution of a tail jet flow field to be obtained more visually. The engine noise test technology has the following advantages: the test precision is high, the test result is visual, the multichannel simultaneous acquisition reduces the frequency of starting an engine during testing, and the test cost is saved.

Description

technical field [0001] The invention belongs to aircraft vibration and noise science, and relates to an engine noise testing technology. Background technique [0002] Aircraft wake jet noise field data is very important, because it is an important basis for the noise protection of ground staff. However, due to foreign technology blockade, it is difficult to obtain relevant technologies for engine noise testing. Before this time, the noise field test of an aircraft was carried out using the traditional run-point method. A total of 76 microphones were used in total, and the engine was driven three times before the test was completed. Obviously, the disadvantages of this method are: [0003] 1) Due to the use of the running point method for testing, the test data is not collected at the same time, resulting in test errors [0004] increase; [0005] 2) The cumulative number of sensors used is large; [0006] 3) Repeated driving of the engine increases the test cost; [000...

Claims

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Application Information

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IPC IPC(8): G01H11/06
Inventor 沈重陈忠明冯世宁周敏亮万玉成林莎
Owner SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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