Wave Propagation Characteristics of Fluid Contained in a Finite-Length Hydraulic High-Pressure Flexible Hose. (2nd Report. Experimental Investigation of Analytical Model in Frequency Domain).

Abstract

With the increasing use of high-pressure flexible hose in hydraulic equipment, the accurate knowledge of its dynamic response is required over a wide frequency range. We investigate the validity of a new model for the wave propagation characteristics in a flexible hose with finite length, which has been developed by us previously, using thick-wire reinforced hydraulic hoses over a wide frequency range. As the model parameters, the normal Young's modulus and Poisson's ratio representing the static mechanical properties of the hose wall are determined in a specially designed static expansion experiment, and the time constants representing the frequency-dependent mechanical properties of the hose wall are determined using an optimization method on the basis of the measured results of transfer matrix parameters of the hose. The model is applied for the prediction of the transfer matrix parameters of hoses with different lengths. By comparing the theoretical results with the experimental results, it is shown that the model gives satisfactory results within the frequency range of around 0∼3 kHz. Also given is a comparison of the theoretical results of the new model with those of two existing models.