1. Air intake noise

We need to distinguish between two types of noise: intake noise, caused by the pulsating flow of air entering through the intake port, and radiated noise, caused by the intake system components, which vibrate under the effect of the pressure pulsations of the air stream circulating inside them, or under the effect of engine vibrations (air filter, rubber or plastic ducts).

This section describes the physical phenomena and technical solutions for intake manifold noise, since this type of noise is more prevalent in today's automobiles than radiated intake system noise.

1.1 The physical phenomenon of mouth noise

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Air intake noise

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Combustion noise

Bibliography

(1) - SOARES (S.), LEANDRE (J.-P.) - Formation pratique au bruit d'admission. - Document interne Renault NT470/96/60866.
(2) - BOYER (A.), LEBLANC (C.), MOLINIER (A.), SAUVAGE (L.) - Les résonateurs de Helmholtz. - École Alsacienne....

Regulations

Regulation (EU) No 540/2014 of the European Parliament and of the Council of April 16, 2014 relating to the noise level of motor vehicles and replacement silencer systems, and amending Directive 2007/46/EC and repealing Directive 70/157/EEC.

Directive 2007/46/EC of the European Parliament and of the Council of September 5, 2007 establishing a framework for the approval of motor vehicles and their trailers,...