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Determination of the sound speed in fluid-filled viscoelastic pipes
Prek, Matjaž
Vibro-acoustic energy travels not only as sound waves through a fluid medium, but also as longitudinal and flexural waves through the pipe walls in a hydraulic system. Longitudinal waves in the pipe ...wall are coupled to the sound waves inside according to Poisson's ratio. One of the most common examples of this form of interaction is observed in water-filled pipes in which the flexibility of the walls significantly alters the speed of propagation of acoustic disturbances along the pipe. This interaction is most evident in viscoelastic pipes, which takes into account the effect of viscoelasticity of the pipe wall material on the wave propagation. In order to determine the speed of sound in water-filled pipes, the pressure transfer function between points along the pipe is experimentally determined. Pressure transducers (hydrophones) are used to measure the fluid-borne sound pressure. The equivalent wavespeed and frequency-dependent attenuation factor is determined from this measured data. With this data, the standard impedance or transfer matrix can be directly derived to analyse the resonating conditions in hydraulic lines. Experimental results for four different pipe wall materials, with particular applications in water supply installations, are presented.
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