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Method of determining noise measuring point arrangement based on mean deviation

A technology of mean deviation and measuring point layout, which is applied in measuring devices, using electrical devices, and measuring ultrasonic/sonic/infrasonic waves, etc.

Active Publication Date: 2014-09-24
SAIC MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the above three cases, a) although there are numerical regulations, but there is no connection between the number of noise measurement points and the measurement uncertainty, while b) and c) are only qualitative regulations without quantification

Method used

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  • Method of determining noise measuring point arrangement based on mean deviation
  • Method of determining noise measuring point arrangement based on mean deviation
  • Method of determining noise measuring point arrangement based on mean deviation

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Embodiment 1

[0045] A method for determining the arrangement of noise measuring points based on mean deviation, comprising the following steps:

[0046] Step 1. Select a noise measurement accuracy level according to the noise measurement national standard, and find out the standard uncertainty limit and the maximum interference standard caused by other interference factors except the measurement point layout factors according to the noise measurement accuracy level Uncertainty, combined with the standard uncertainty limit, the maximum interference standard uncertainty and the maximum standard uncertainty caused by the measurement distance to calculate the standard deviation threshold of the average value of the sound pressure level measured at all microphone positions, referred to as the mean deviation threshold;

[0047] Step 2. Determine the measurement distance according to the accuracy level of noise measurement, the shape and position of the reference body 2, and the acoustic environm...

Embodiment 2

[0074] like image 3 , 4 As shown, in this embodiment, a rectangular hexahedron measuring surface is taken as an example to arrange noise measuring points according to this method.

[0075] Step 1. The noise measurement accuracy grade selected in this embodiment is grade 2, see the description in "Internal Combustion Engine Noise, Vibration and Control" (edited by Wu Yanting and Yuan Weiping, Beijing: Machinery Industry Press, 1999), and the corresponding standard uncertainty limit value 1.5dB. Theoretical analysis and experimental verification show that the maximum interference standard uncertainty caused by other interference factors in addition to the measurement point layout factors during noise measurement for dB, the maximum distance standard uncertainty caused by the measurement distance when the noise measurement points are arranged 0.6dB;

[0076] mean deviation threshold =0.8(dB), ie ≤0.8 (dB).

[0077] Step 2: Determine the measurement distance as 1m ...

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Abstract

The invention relates to the field of noise measuring, in particular to a method of noise measuring point arrangement. The method of determining the noise measuring point arrangement based on a mean deviation comprises the steps that a mean deviation threshold of the measuring point arrangement is obtained according to a noise measuring accuracy class; a measuring distance is determined; a measuring surface is obtained; positions and quantity of initial noise measuring points are determined according to the accuracy class and the measuring distance; a mean deviation measured value is calculated according to a noise measuring result; the mean deviation measured value and the mean deviation threshold of the measuring point arrangement are compared; measuring point arrangement completion or measuring point increase is decided; and the measuring points are rearranged until the mean deviation measured value is smaller than or equal to the threshold. The method is used for determining the noise measuring point arrangement based on the mean deviation, so that the measuring uncertainty caused by noise measuring point arrangement factors can be quantified, and can be controlled effectively; and therefore, the uncertainty of a noise sound power level measuring result can meet an uncertainty requirement specified by the corresponding accuracy class.

Description

technical field [0001] The invention relates to the field of noise measurement, in particular to a method for arranging noise measurement points. Background technique [0002] Various types of machines and equipment are included in the existing series of standards for measuring the sound power level of noise sources by the acoustic sound pressure method. These basic standards specify the acoustic requirements suitable for measuring sound power levels in different environments and accuracy levels. , including the acoustic conditions and instrumentation, the measurement procedure to be followed, and the installation and operating conditions of the machine under test. These standards do not specify the relationship between noise measuring point layout and the measurement uncertainty required by the corresponding accuracy level, that is, they do not quantify the measurement uncertainty caused by noise measuring point layout factors and put forward limit value requirements. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H11/08
Inventor 袁卫平胡爱华姜晓敏
Owner SAIC MOTOR
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