Oluschinski at 13:20, 12 December 2025

2025-12-12T13:20:05Z

← Older revision		Revision as of 15:20, 12 December 2025
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	* Kuttruff, H.: Akustik – Eine Einführung. S. Hirzel Publishing, Stuttgart Leipzig (2004), (ISBN 3-7776-1244-8)		* Kuttruff, H.: Akustik – Eine Einführung. S. Hirzel Publishing, Stuttgart Leipzig (2004), (ISBN 3-7776-1244-8)
	* v. Ardenne, M.: Effekte der Physik und ihre Anwendungen. Harri Deutsch Verlag, Frankfurt/Main (2005), (ISBN 978-3-8171-1682-9)		* v. Ardenne, M.: Effekte der Physik und ihre Anwendungen. Harri Deutsch Verlag, Frankfurt/Main (2005), (ISBN 978-3-8171-1682-9)
	* ISO/FDIS 3744 (2024-07): Acoustics – Determination of Sound Power Levels of Noise Sources Using Sound Pressure – Engineering Methods for an Essentially Free Field over a Reflecting Plane		* ISO/FDIS 3744 (2024-07): Acoustics – Determination of Sound Power Levels of Noise Sources Using Sound Pressure – Engineering Methods for an Essentially Free Field over a Reflecting Plane (Draft)

	[[Category:Acoustic Test Methods_Ultrasonics]]		[[Category:Acoustic Test Methods_Ultrasonics]]

Oluschinski: Created page with "{{Language_sel|LANG=ger|ARTIKEL=Schallleistung}} {{PSM_Infobox}} Sound power FORCETOC ==Definition== Sound power is a material parameter that is widely used in non-destructive polymer testing, particularly in acoustic resonance analysis and ultrasound testing. It represents the sound energy emitted per unit..."

2025-12-05T13:35:36Z

Created page with "{{Language_sel|LANG=ger|ARTIKEL=Schallleistung}} {{PSM_Infobox}} Sound power __FORCETOC__ ==Definition== Sound power is a material parameter that is widely used in non-destructive polymer testing, particularly in acoustic resonance analysis and ultrasound testing. It represents the sound energy emitted per unit..."

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{{Language_sel|LANG=ger|ARTIKEL=Schallleistung}}
{{PSM_Infobox}}
Sound power
__FORCETOC__

==Definition==

Sound power is a [[Material Parameter|material parameter]] that is widely used in [[Non-destructive Polymer Testing|non-destructive polymer testing]], particularly in [[Resonance Analysis|acoustic resonance analysis]] and [[Ultrasound Testing|ultrasound testing]]. It represents the sound energy emitted per unit of time, e.g. by a motor or machine, and is evaluated according to perception-oriented criteria and expressed as sound power level LP. Caution is advised when calculating with logarithmic values. Adding levels corresponds to multiplying the underlying linear [[Measured Value|measured values]]. Adding two sound levels of equal magnitude results in a sound level that is 3 dB higher.

{|
|1 dB
|smallest audible level difference
|-
|3 dB
|doubling of power
|-
|6 dB
|doubling of amplitude, 4 times the power
|-
|10 dB
|doubling of subjective loudness, 10 times the power
|-
|20 dB
|ten times the amplitude, 100 times the power
|}

'''Reference'''

* Hertlin, Ingolf: Informationsschriften zur zerstörungsfreien Prüfung – ZfP kompakt und verständlich. Band 5: Akustische Resonanzanalyse. Castell Verlag GmbH, Wuppertal (2003)

==Acoustic sound field variables==

The sound power ''P''S describes the energy that flows from a sound source ''Q'' through a closed [[Surface|surface area]] ''S'' surrounding it. It is the integral of the sound intensity ''I''S over the closed surface area ''S''.

The sound power is related to the sound intensity as follows:

{|
|-
|width="20px"|
|width="500px" | <math>P_S\,=\,\oint\oint \vec I_S \, d \vec A</math>
|}

Since sound intensity, which represents a flow of energy, is an energetic parameter, the surface around the sound source can be chosen arbitrarily. The '''figure''' shows two equivalent surface segments ''δS'' as an example, whose geometry is proportional to the distance from the sound source ''Q''. Integrating over both surface segments would yield the same result.

[[File:Schallleistung.JPG]]
{|
|- valign="top"
|width="50px"|'''Figure''':
|width="600px" |Representation of arbitrarily curved surfaces through which the sound energy emitted by a sound source ''Q'' flows
|}

The sound power is determined in accordance with the envelope method specified in ISO 3744.

==See also==

* [[Sound Emission|Sound emission]]
* [[Sound Pressure|Sound pressure]]
* [[Sound Velocity|Sound velocity]]
* [[Sound Emission Testing|Sound emission testing]]
* [[Sound Emission Analysis|Sound emission analysis]]

'''References'''

* Stöcker, H.: Taschenbuch der Physik. Harri Deutsch Verlag, Frankfurt/Main (1994), (ISBN 978-3-8171-1720-8)
* Winkelmann, A. A.: Handbuch der Physik. 2nd Volume (Akustik) Barth (1909)
* Kuttruff, H.: Akustik – Eine Einführung. S. Hirzel Publishing, Stuttgart Leipzig (2004), (ISBN 3-7776-1244-8)
* v. Ardenne, M.: Effekte der Physik und ihre Anwendungen. Harri Deutsch Verlag, Frankfurt/Main (2005), (ISBN 978-3-8171-1682-9)
* ISO/FDIS 3744 (2024-07): Acoustics – Determination of Sound Power Levels of Noise Sources Using Sound Pressure – Engineering Methods for an Essentially Free Field over a Reflecting Plane

[[Category:Acoustic Test Methods_Ultrasonics]]

Sound Power - Revision history

Oluschinski at 13:20, 12 December 2025