Generation and control of noise in water supply installations. Part 2: Sound source mechanisms

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Abstract

The specific disturbance characteristics of the noise from sanitary installations require strict regulations for limiting immission noise levels in buildings. Aiming at a better understanding and subsequent control of the underlying sound generation processes, an attempt is made herein to derive hydroacoustic scaling laws for the dominant noise sources involved. Turbulent excitation of a fluid mass, volume pulsations due to cavitation and the dramatic effects due to but small geometrical modifications at a flow restriction are demonstrated with the aid of a simple valve model. Apart from this waterborne sound, the importance of various impact noise sources is also emphasized in this second of a series of three papers dealing with these sound sources dominating in residential structures.

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Part 1 (Fundamental Aspects) appeared in Applied Acoustics, 16 (1983) 325-46.

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