Decibel dB - Revision history

Editor at 16:39, 24 December 2021

2021-12-24T16:39:22Z

← Older revision		Revision as of 16:39, 24 December 2021
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	* Peak sound pressure of 140 dB.		* Peak sound pressure of 140 dB.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Airborne sound.		* Airborne sound.
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	* Equivalent continuous sound pressure level.		* Equivalent continuous sound pressure level.
	* Impact sound.		* Impact sound.
		+	* Noise level.
	* Robust details certification scheme.		* Robust details certification scheme.
	* Room acoustics.		* Room acoustics.

Editor at 10:37, 12 April 2021

2021-04-12T10:37:52Z

← Older revision		Revision as of 10:37, 12 April 2021
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	* Sound v noise.		* Sound v noise.
	* Structure-borne sound.		* Structure-borne sound.
		+	* Workplace noise exposure estimator.

−	External references	+	= External references =

	* [http://www.cirrusresearch.co.uk/library/documents/application_notes/article_7_01.pdf Cirrus Research – Measuring noise in the construction industry].		* [http://www.cirrusresearch.co.uk/library/documents/application_notes/article_7_01.pdf Cirrus Research – Measuring noise in the construction industry].

Designing Buildings at 08:43, 28 October 2020

2020-10-28T08:43:13Z

← Older revision		Revision as of 08:43, 28 October 2020
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	* [https://www.pce-instruments.com/english/measuring-instruments/test-meters/sound-level-meter-noise-level-meter-kat_40095.htm PCE Instruments - Sound Level Meter]		* [https://www.pce-instruments.com/english/measuring-instruments/test-meters/sound-level-meter-noise-level-meter-kat_40095.htm PCE Instruments - Sound Level Meter]

−	[[Category:~~Standards_/_measurements~~]] [[Category:DCN_Standard]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Standard]] [[Category:Standards_/_measurements]]

Editor at 16:21, 20 May 2020

2020-05-20T16:21:22Z

← Older revision		Revision as of 16:21, 20 May 2020
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	* Impact sound.		* Impact sound.
	* Robust details certification scheme.		* Robust details certification scheme.
		+	* Room acoustics.
	* Sound absorption.		* Sound absorption.
	* Sound frequency.		* Sound frequency.
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	* [https://www.pce-instruments.com/english/measuring-instruments/test-meters/sound-level-meter-noise-level-meter-kat_40095.htm PCE Instruments - Sound Level Meter]		* [https://www.pce-instruments.com/english/measuring-instruments/test-meters/sound-level-meter-noise-level-meter-kat_40095.htm PCE Instruments - Sound Level Meter]

−	[[Category:Standards_/_measurements]]	+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]]

87.139.183.24 at 11:36, 19 July 2019

2019-07-19T11:36:55Z

← Older revision		Revision as of 11:36, 19 July 2019
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	Sound is a variation in pressure detectable by the ear, whereas noise is undesired sound, or any sound which causes disturbance or annoyance to the recipient. The unit used to describe sound wave intensity is the bel, named after the inventor Alexander Graham Bell. The human ear is sensitive enough to detect changes of as little as 1/10 of a bel, and so sound intensity levels are described in decibels.		Sound is a variation in pressure detectable by the ear, whereas noise is undesired sound, or any sound which causes disturbance or annoyance to the recipient. The unit used to describe sound wave intensity is the bel, named after the inventor Alexander Graham Bell. The human ear is sensitive enough to detect changes of as little as 1/10 of a bel, and so sound intensity levels are described in decibels.
		+
		+	Today it is nearly impossible to find a place in a town or city where there is absolute and total silence. There is simply too much traffic, too many people, factories, plants, railway stations, airports and so on. And yet noise pollution is proven to be detrimental to human health and safety. That is why permissible levels of sound emissions are under permanent control by various regulatory agencies. Any equipment used outside (vehicles, devices, machinery) should meet the requirements of the directives concerning noise and outdoor equipment.
		+
		+	Especially in residential neighborhoods, there are particular time periods when work by means of drills and other noisy equipment can be carried out. Even though these sounds are fleeting, their levels are extremely high for unprotected human ears and must be measured by a sound level meter to assess risk and prevent damaging exposure. Problems with noise levels also are experienced by those living in close proximity to railway stations, airports, busy streets, hospitals and fire and police stations. Excessive long-term exposure to high-level noise negatively impacts human health, resulting in hearing damage, raised nervousness, irritability and unstable psychological conditions. Thus, in some areas noise monitoring and control by use of a sound level meter is an essential and mandated task.
		+
		+	Noise levels between 120 dB and 150 dB (e.g., airplanes taking off and landing, drilling and sawing of roadways) are dangerous to human hearing and their continuous presence has dire consequences. Perfect noise levels are between 30 dB and 50 dB, though these pleasant levels are sometimes unreachable in today's society.

	A sound wave’s intensity is the average amount of energy transmitted per unit time through a unit area in a specified direction. The sound intensity level, I, in decibels is 10 times the logarithm of the ratio of the intensity of a sound wave to a reference intensity:		A sound wave’s intensity is the average amount of energy transmitted per unit time through a unit area in a specified direction. The sound intensity level, I, in decibels is 10 times the logarithm of the ratio of the intensity of a sound wave to a reference intensity:
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	* [http://www.dangerousdecibels.org/ Dangerous Decibels].		* [http://www.dangerousdecibels.org/ Dangerous Decibels].
	* [http://www.hse.gov.uk/noise/regulations.htm HSE – Noise regulations].		* [http://www.hse.gov.uk/noise/regulations.htm HSE – Noise regulations].
		+	* [https://www.pce-instruments.com/english/measuring-instruments/test-meters/sound-level-meter-noise-level-meter-kat_40095.htm PCE Instruments - Sound Level Meter]

	[[Category:Standards_/_measurements]]		[[Category:Standards_/_measurements]]

Designing Buildings at 14:29, 21 January 2019

2019-01-21T14:29:21Z

← Older revision		Revision as of 14:29, 21 January 2019
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	* Sound absorption.		* Sound absorption.
	* Sound frequency.		* Sound frequency.
		+	* Sound power level.
	* Sound v noise.		* Sound v noise.
	* Structure-borne sound.		* Structure-borne sound.

Designing Buildings at 12:17, 24 December 2018

2018-12-24T12:17:42Z

← Older revision		Revision as of 12:17, 24 December 2018
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	* Peak sound pressure of 140 dB.		* Peak sound pressure of 140 dB.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Airborne sound.		* Airborne sound.
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	* Control of Noise at Work Regulations 2005.		* Control of Noise at Work Regulations 2005.
	* Environmental health.		* Environmental health.
		+	* Equivalent continuous sound pressure level.
	* Impact sound.		* Impact sound.
	* Robust details certification scheme.		* Robust details certification scheme.

Editor at 14:06, 27 March 2017

2017-03-27T14:06:23Z

← Older revision		Revision as of 14:06, 27 March 2017
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	* Airborne sound.		* Airborne sound.
	* Approved Document E.		* Approved Document E.
		+	* Audio frequency.
	* Building acoustics.		* Building acoustics.
	* Control of Noise at Work Regulations 2005.		* Control of Noise at Work Regulations 2005.

Designing Buildings at 10:36, 8 March 2017

2017-03-08T10:36:39Z

← Older revision		Revision as of 10:36, 8 March 2017
Line 65:		Line 65:
	* Environmental health.		* Environmental health.
	* Impact sound.		* Impact sound.
		+	* Robust details certification scheme.
	* Sound absorption.		* Sound absorption.
	* Sound frequency.		* Sound frequency.

Editor at 14:09, 4 January 2017

2017-01-04T14:09:01Z

← Older revision		Revision as of 14:09, 4 January 2017
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−
	= Introduction =		= Introduction =

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	A sound wave’s intensity is the average amount of energy transmitted per unit time through a unit area in a specified direction. The sound intensity level, I, in decibels is 10 times the logarithm of the ratio of the intensity of a sound wave to a reference intensity:		A sound wave’s intensity is the average amount of energy transmitted per unit time through a unit area in a specified direction. The sound intensity level, I, in decibels is 10 times the logarithm of the ratio of the intensity of a sound wave to a reference intensity:

−	[[File:~~Decibel equation~~.jpg\|~~RTENOTITLE~~]]	+	[[File:Decibel_equation.jpg\|link=File:Decibel_equation.jpg]]

	= The decibel scale =		= The decibel scale =
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	Those working in the construction industry are often exposed to an increased noise level. Some examples of construction equipment and their approximate decibel levels are shown below:		Those working in the construction industry are often exposed to an increased noise level. Some examples of construction equipment and their approximate decibel levels are shown below:
−	*Backhoe: 84-93 dB	+
−	*Bulldozer: 93-96 dB	+	* Backhoe: 84-93 dB
−	*Concrete joint cutter: 99-102 dB	+	* Bulldozer: 93-96 dB
−	*Crane: 90-96 dB	+	* Concrete joint cutter: 99-102 dB
−	*Earth tamper: 90-96 dB	+	* Crane: 90-96 dB
−	*Earthmover: 87-94 dB	+	* Earth tamper: 90-96 dB
−	*Front-end loader: 86-94 dB	+	* Earthmover: 87-94 dB
−	*Hammer: 87-95 dB	+	* Front-end loader: 86-94 dB
−	*Jackhammer: 102-111 dB	+	* Hammer: 87-95 dB
−	*Pneumatic chip hammer: 103-113 dB	+	* Jackhammer: 102-111 dB
−	*Portable saw: 88-102 dB	+	* Pneumatic chip hammer: 103-113 dB
−	*Stud welder: 101 dB	+	* Portable saw: 88-102 dB
		+	* Stud welder: 101 dB

	The Control of Noise at Work Regulations 2005 requires that employers to take steps to reduce the harmful effects of noise on hearing. These relate to the levels of exposure to noise averaged by an employee over a working day or week and the maximum noise (peak sound pressure) to which they are exposed in a working day. There are two main action levels for continuous noise:		The Control of Noise at Work Regulations 2005 requires that employers to take steps to reduce the harmful effects of noise on hearing. These relate to the levels of exposure to noise averaged by an employee over a working day or week and the maximum noise (peak sound pressure) to which they are exposed in a working day. There are two main action levels for continuous noise:

	Lower exposure action value, at which the employer must make hearing protection available and provide information and training.		Lower exposure action value, at which the employer must make hearing protection available and provide information and training.
−	*Daily or weekly exposure of 80 dB.	+
−	*Peak sound pressure of 135 dB.	+	* Daily or weekly exposure of 80 dB.
		+	* Peak sound pressure of 135 dB.

	Upper exposure action value, above which the employer is required to take reasonably practicable measures to reduce noise exposure, such as engineering controls or other technical measures. If the noise cannot be controlled by these measures, hearing protection is mandatory.		Upper exposure action value, above which the employer is required to take reasonably practicable measures to reduce noise exposure, such as engineering controls or other technical measures. If the noise cannot be controlled by these measures, hearing protection is mandatory.
−	*Daily or weekly exposure of 85 dB.	+
−	*Peak sound pressure of 137 dB.	+	* Daily or weekly exposure of 85 dB.
		+	* Peak sound pressure of 137 dB.

	Exposure limit value, levels of noise exposure which must not be exceeded.		Exposure limit value, levels of noise exposure which must not be exceeded.
−	*Daily or weekly exposure of 87 dB.	+
−	*Peak sound pressure of 140 dB.	+	* Daily or weekly exposure of 87 dB.
		+	* Peak sound pressure of 140 dB.

	= Find out more =		= Find out more =

	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Airborne sound.
−	*Building acoustics.
−	*Control of Noise at Work Regulations 2005.
−	*Environmental health.
−	*Impact sound.
−	*Sound absorption.
−	*Sound frequency.
−	*Sound v noise.
−	*Structure-borne sound.

−	~~'''~~External references~~'''~~	+	* Airborne sound.
−	*[http://www.cirrusresearch.co.uk/library/documents/application_notes/article_7_01.pdf Cirrus Research – Measuring noise in the construction industry].	+	* Approved Document E.
−	*[http://www.dangerousdecibels.org/ Dangerous Decibels].	+	* Building acoustics.
−	*[http://www.hse.gov.uk/noise/regulations.htm HSE – Noise regulations].	+	* Control of Noise at Work Regulations 2005.
		+	* Environmental health.
		+	* Impact sound.
		+	* Sound absorption.
		+	* Sound frequency.
		+	* Sound v noise.
		+	* Structure-borne sound.
		+
		+	External references
		+
		+	* [http://www.cirrusresearch.co.uk/library/documents/application_notes/article_7_01.pdf Cirrus Research – Measuring noise in the construction industry].
		+	* [http://www.dangerousdecibels.org/ Dangerous Decibels].
		+	* [http://www.hse.gov.uk/noise/regulations.htm HSE – Noise regulations].

	[[Category:Standards_/_measurements]]		[[Category:Standards_/_measurements]]