4. Muffler characterization

As mentioned in 2.3 , the noise associated with the use of compressed air is caused by the expansion of pressurized air into the atmosphere in the form of an air jet. The silencer's role is to reduce the noise emitted by an exhaust system. It brings about a reduction in noise known as "insertion loss". However, this loss depends on test conditions, and the Machinery Directive requires sound pressure to be displayed rather than insertion...

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Conclusion

Bibliography

(1) - DONALDSON (C.D.), SNEDEKER (R.S.) - A study of free jet impingement. Part 1. Mean properties of free and impinging jets. - Journal of Fluid Mechanics, vol. 45, part 2, p. 281-319 (1971).
(2) - TANNA (H.K.) - An experimental study of jet noise, part 2....

Regulations

Directive 2006/42/EC of the European Parliament and of the Council of May 17, 2006, on machinery, and amending Directive 95/16/EC.

Directive 2003/10/EC of the European Parliament and of the Council of February 6, 2003, on the minimum health and safety requirements regarding the exposure of workers to the risks arising from physical agents (noise).

Standards and norms

Acoustics – Noise from machinery and equipment – Guide to using the basic standards for determining emission sound pressure levels at workstations and other specified positions. - NF EN ISO 11200 - juillet 2014
Acoustics – Noise from machinery and equipment – Determination of emission sound pressure levels at the workstation and at other specified positions under conditions approaching those of the free field on...