Theoretical analysis of pressure and flow ripple in flexible hoses containing tuners

Abstract In automotive power steering systems it is common practice to include highly expandible hoses containing tubular inserts, referred to as tuners, to minimize the pump-generated pressure ripple. A theoretical model of a flexible hose containing a tuner is described, which can be used to compute the fluid-borne noise characteristics of complete systems. Excellent agreement with experimental measurements is obtained. Leakage through the tuner wall is shown to have a strong effect on the results. With the common type of spiral wound tuner, most of the damping present is obtained from this leakage and from energy loss in the hose wall, and for low-viscosity fluids it may be acceptable to ignore the effect of fluid viscosity.