2. Noise in liquid or solid media
A rotating pump generates noise in three forms: hydraulic noise, which can be considered the pump's primary noise, solid-borne noise, which is both primary and secondary, and airborne noise, which is a secondary noise generated by the first two through noise radiators that form a more or less complex transmission chain, in which piping plays a major role.
2.1 Specific characteristics of hydraulic noise
With the exception of what concerns the sensitivity of the ear, the notions we have just seen § 1
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Hydraulic, aerodynamic and thermal machines
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Noise in liquid or solid media
Sources of pump noise
Bibliography
Circuit calculation codes
Pressure fluctuations emitted by a pump (or valve) must be analyzed to determine the risk they represent for the circuit (stresses, vibration levels, natural frequencies, forces exerted on the structure).
As we have already seen
Standardization
All aspects of testing standards are covered in depth in the reference . We have extracted the most important passages:
Airborne noise measurement
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