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Method and device for determining acoustic coefficients and acoustic power

A sound power, sound coefficient technique applied in the field of sound absorption and/or sound transmission coefficients at selected locations

Inactive Publication Date: 2015-01-28
桑德因赛特有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, common methods for determining the transmitted power of sound sources can only be performed in a laboratory environment

Method used

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  • Method and device for determining acoustic coefficients and acoustic power
  • Method and device for determining acoustic coefficients and acoustic power
  • Method and device for determining acoustic coefficients and acoustic power

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Experimental program
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Embodiment Construction

[0017] In view of the above, the present invention provides a method for determining the sound absorption coefficient and / or sound transmission coefficient at a selected location in a space due to the operation of a sound source and / or the sound power emitted by the sound source , there is a certain sound field in the space, the method includes the following steps:

[0018] (a) measure the sound pressure p(t) and particle velocity v(t) at a selected location in the space;

[0019] (b) Calculate the Fourier transform P(f), V(f) of p(t), v(t);

[0020] (c) On the basis of P(f) and V(f), calculate the time-averaged active intensity Iac(f) in the direction denoted by vector n (which is the normal vector to the relevant surface) and The time-averaged total intensity Itot(f) in the direction;

[0021] (d) Determine the time-averaged incident sound intensity in direction n:

[0022] Iin(f)=1 / 2(Iac(f)+Itot(f)); and the following steps:

[0023] (e) Determine the time-averaged soun...

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Abstract

A method for determining the acoustic absorption coefficient and / or the transmission coefficient at a chosen position in a space in which a certain sound field prevails as a result of the operation of a sound-emitting source.

Description

technical field [0001] The present invention relates to a method and a device for determining the sound absorption coefficient and / or sound transmission coefficient at a selected location in a space due to the operation of a generating source and / or the sound power emitted by the generating source There is a certain sound field in this space. Background technique [0002] Measurement methods for determining the sound absorption coefficient of acoustic materials are generally known and common. The sound absorption coefficient is defined as the fraction of incident sound intensity / power absorbed by a defined surface at a defined location in space. However, it can be measured only by measuring active sound intensity / power (ie subtracting reflected sound intensity / power from incident sound intensity / power) and incident sound intensity / power. [0003] Such measurements are problematic in practice and cannot always be performed in a simple and fast manner. The essence here is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H3/10
CPCG01H3/10G01H9/002G01H3/12G01N29/46
Inventor 伊斯布兰德·汉斯·维基南特
Owner 桑德因赛特有限责任公司