Article | REF: BM4179 V1

Pump noise

Author: Jean POULAIN

Publication date: July 10, 1998

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1. Notions of airborne acoustics

Sound waves are not transmitted in a vacuum. They need a material support to propagate. In this first part, we'll look at the propagation of waves in the air around us.

The quantities we're about to consider, whether pressure fluctuations or particle displacements, are oscillatory quantities; their value varies over time around a mean level, which is unimportant, and which is ordinarily, and by convention, considered to be equal to zero.

1.1 Periodic acoustic wave

The noise perceived by the ear is linked to the variation over time of the pressure p. The simplest form corresponds to a sinusoidal evolution of p. In this case, the phenomenon can be characterized by just 2 quantities, e.g. the...

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Notions of airborne acoustics
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