CAVITATION DRIVEN IMPACT IN A HYDRAULIC PISTON PUMP - A THEORETICAL AND EXPERIMENTAL INVESTIGATION

摘要

The occurrence of cavitation in a huge hydraulic supply systemrnof a rolling mill which caused a severe defect in an axial pistonrnpump is investigated by a mathematical model of the complexrnsuction system. It comprises wave propagation in pipes andrnhoses, a detailed model of the pump including each of its ninerncylinders, cavitation therein, the charge and discharge processesrnof these cylinders with the intake duct, and several accessoriesrninfluencing the hydraulic processes. Results obtained by thisrnmodel are compared with on-site experiments. Countermeasuresrnwhich have been proposed are evaluated by our model and theirrnpractical examination is reported. Due to the strong nonlinearityrnof cavitation the dynamical system shows two attractingrnlimit sets, one with and one without cavitation. The operatingrnconditions of the original supply system cause startup conditionsrnwhich do not lie in the basin of attraction of the non-cavitatingrnattractor.