Structure-borne noise prediction in liquid-conveying pipe systems

This paper describes a method to predict fluid-induced structural vibrations in liquid-conveying pipe systems. A previously reported transfer matrix method has been extended to include predictions for long pipes. The length-diameter ratio of the simulated circuit has been increased from the previously reported value of 17.5 to 207. When compared to the experimental data from two different pipe configurations, excellent agreement was found between the measured and predicted resonant frequencies. However, at these resonant frequencies, the predicted oscillation levels were overestimated. This problem, which has been overlooked in previous fluid-structural coupling studies, can be resolved by the introduction of frequency-dependent viscosity in the fluid.