Structural-Acoustic Wave Transmission and Reflection in a Hose-Pipe System

Abstract

An analysis of sound and vibratory transmission and reflection losses in a fluid filled planar piping system which consists of straight pipe segments, flexible hose, elbows and/or U-joints is discussed in this paper. The transfer matrix approach is used for the analysis. The wave propagation constants for various types of waves calculated from the transfer matrix method were verified with an exact elasticity theory. Although calculation of the transmission losses for a hose-pipe system has been widely discussed in the literature, the reflection characteristics of a hose-pipe system, however, have not received proper attention. In this paper, we calculate the reflection, absorption, and transmission coefficients of a piping system simultaneously. The numerical example shows that very large pressure and bending wave transmission losses that occur in a hose-pipe system are not only caused by attenuation and dissipation but also by the reflection from the system.

Structure- and fluid-borne acoustic power sources induced by turbulent flow in 90° piping elbows

“…Lesmez et al (1990) and Hwang (2002), among others, have used impedance matrices to relate fluctuating forces (or pressures) and velocities at discrete frequencies. Coupling between all structural and acoustic wavetypes may be included in the matrices.…”

Dispersion Relations and Modal Patterns of Wave in a Cylindrical Shell

“…The dispersion relation of a circular cylindrical shell had been a subject of great interest for several decades [1][2][3]. In some earlier works, numerical procedures were used exclusively in the computation of dispersion relations.…”