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A method for measuring noise in an aircraft cabin

An aircraft cabin and noise technology, applied in the field of measuring the noise in the aircraft cabin, can solve the problems of huge cost investment, less raw data, and lag in research and development work, and achieve the effects of high measurement accuracy, lower experimental thresholds, and low test costs.

Active Publication Date: 2021-10-19
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If each experiment and measurement uses a real machine for real operation, the cost investment will be huge, and limited by the cost, the number of experiments will not be many, and the original data collected will be less
And once the aircraft is formed, then the experimental data measurement, such research and development work is undoubtedly lagging behind

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for measuring noise in an aircraft cabin, characterized in that it comprises the following processes:

[0021] Miniature model production: Make a real aircraft into a scale model, and the scale of the model depends on the size of the wind tunnel.

[0022] Microphone layout: 6 microphones are arranged in the model cabin, and the equidistant arrays of microphones are distributed on the same spherical surface. The specific positions of the microphones in the model cabin are placed according to the parts where the noise needs to be measured.

[0023] Microphone model: 1 / 2-inch microphone 46AE from G.R.A.S; frequency: 3.15Hz (±2dB); dynamic response: 14dBA re.20μPa; sensitivity: 50mV / Pa (at 250Hz).

[0024] Noise detection: including cabin sound pressure level SPL before correction m and wind tunnel background noise sound pressure level SPLw;

[0025] Data correction: adopted Correction for the effect of wind tunnel background noise, SPL c is the corrected soun...

Embodiment 2

[0029] A method for measuring noise in an aircraft cabin, characterized in that it comprises the following processes:

[0030] Miniature model production: Make a real aircraft into a scale model, and the scale of the model depends on the size of the wind tunnel.

[0031] Microphone layout: Arrange 12 microphones in the model cabin, and the microphones are distributed in an equidistant array on the same spherical surface. The specific position of the microphone in the model cabin depends on the position where the noise needs to be measured.

[0032] Microphone model: 1 / 2-inch microphone 46AE from G.R.A.S; frequency: 20kHz (±2dB); dynamic response: 135dBA re.20μPa; sensitivity: 50mV / Pa (at 250Hz).

[0033] Noise detection: including cabin sound pressure level SPL before correction m and wind tunnel background noise sound pressure level SPLw;

[0034] Data correction: adopted Correction for the effect of wind tunnel background noise, SPL c is the corrected sound pressure lev...

experiment example

[0037] In the table, the noise value in the cabin of the aircraft measured in the wind tunnel and the noise value in the cabin of the aircraft in actual use are counted under different frequencies through the patented technology.

[0038] Frequency / HZ 200 500 1000 2000 5000 10000 Test / dB(A) 65.4 73.8 79.4 76.4 71.8 61.2 Measured / dB(A) 63.1 70.2 78.1 79.3 74.3 58.2

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PUM

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Abstract

The invention discloses a method for measuring noise in an aircraft cabin, which comprises the steps of making a miniature model, arranging a microphone, detecting noise, correcting data, converting data and the like. The method has the characteristics of low cost, high precision and wide application range.

Description

technical field [0001] The invention relates to the field of noise monitoring, in particular to a method for measuring noise in an aircraft cabin. Background technique [0002] The noise in the aircraft cabin is an important indicator that affects the comfort of passengers. Severe noise may cause discomfort to passengers and pilots, such as fatigue, rapid heartbeat, and elevated blood pressure. Phenomena such as instability and sensitivity weakening occur. With the continuous improvement of the comfort of commercial aircraft, the noise has been paid more and more attention by the industry. Understanding noise sources and collecting noise data are the basis for noise reduction research during aircraft development. It is very important to measure the noise source, transmission path identification, and noise reduction level in the cabin. [0003] Airplanes are different from automobiles in that they have larger volumes and strict operating conditions. If the real machine is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00G01M9/06
CPCG01H17/00G01M9/06
Inventor 马瑞轩左孔成唐道锋赵昱李征初宋玉宝黄奔卢翔宇田昊雷红胜王勇曾波郝南松
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT