Vibro-acoustics of hose-pipe systems

Abstract

Vibro-acoustic energy travels through hose walls as longitudinal waves and flexural waves, apart from the sound waves that travel through the fluid medium inside. For any of these three types of waves incident at one end of a hose, waves of all three types may be transmitted to the other end because of their dynamical coupling with one another. Therefore, in the present paper, using suitable boundary conditions frequency functions have been derived for two-dimensional or planar piping systems as well as beams in terms of elements of the overall 8×8 transfer matrix of the system. These frequency functions have then been used in a comprehensive computer program to evaluate the natural frequencies of beams and hoses, with particular application to automotive climate control systems with liquid media.