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Engine noise testing method based on outfield airplane

A noise testing and engine technology, applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., to achieve accurate measurement and suppress noise

Inactive Publication Date: 2015-09-09
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an engine noise test method based on an outfield aircraft, which combines the sound pressure method and the sound intensity method to measure the engine noise of an outfield aircraft.

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  • Engine noise testing method based on outfield airplane
  • Engine noise testing method based on outfield airplane
  • Engine noise testing method based on outfield airplane

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Embodiment Construction

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. This embodiment is to test a certain in-line six-cylinder engine. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the invention.

[0036] Reference figure 1 As shown, the test system of the present invention based on the engine noise test method of the outfield aircraft adopts the BSWA-VS302N (USB) dual-channel college entrance analyzer, which is composed of a sensor, an analysis part and a display part. The sensor adopts a sound pressure sensor, which is a An acoustic-electric converter is used to pick up signals and convert the measured acoustic signals into electrical signals; the analysis part includes a charge amplifier, A / D conversion board (digital signal processing), used to amplify, attenua...

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Abstract

The invention provides an engine noise testing method based on an outfield airplane. The method comprises the following steps of: 1) selecting requirements of a noise measuring condition; 2) arranging measuring points; 3) preparing a measuring field and establishing a noise testing system; 4) measuring and recording the frequency spectrum (A-weighted) of sound pressure level frequency multiplication of airplane engine noises, then calculating a total sound pressure level of all the measuring points; 5) measuring the sound pressure level of each measuring point in the step 4); 6) measuring a surface average sound pressure level; 7) measuring a sound power level of the engine noises; and 8) analyzing the measured noises. Compared with the prior art, the method provided by the invention is capable of accurately measuring the noises of the outfield airplane engine, and a basis is provided for the research of outfield airplane engine noise inhibition.

Description

Technical field [0001] The invention belongs to the field of noise testing, and specifically relates to an engine noise testing method in an aircraft field maintenance environment. Background technique [0002] The current methods of noise measurement include sound pressure measurement and sound intensity measurement technology. Sound pressure method: Sound pressure is the most basic acoustic quantity and the most basic quantity for evaluating engine noise; Sound intensity method: Sound intensity is a vector, so the sound intensity of a component in a certain direction is not easily affected by other sound sources. The measurement environment is not demanding, the measurement results are accurate, the test time is short, and the test analysis cost is low. Its shortcomings are: the sound pressure method is easily affected by background noise and sound reflection, so it has higher requirements for the measurement environment. Only when the measurement is performed in an anechoic o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/06
Inventor 李海山于宝成刘舰维王春梅
Owner WUHAN INSTITUTE OF TECHNOLOGY
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