Research on Key Technology of Hydraulic Impulse Testing Equipment

Abstract

Aiming at the ability of the key technology problem of hydraulic impulse-testing equipment to reliably and controllably produce standard hydraulic pulse, on the basis of the pipe-cubage model, a ramp model has been established for the first time, and the response expression of ramp input has been deduced. The computation results indicate that the maximum adjustable excess of a ramp-input model is 67.7%. According to the step-input and the ramp-input models, theoretical analysis shows that the ramp-input signal can be treated as a step-input signal when the time of ramp input is less than one-tenth of system oscillation periods, and the simulation results indicate that the difference of the maximal excess of both ramp and step models is no more than 7%. Both the step-input and ramp-input models have carried out digital simulations using software and the electrohydraulic assimilation method. The simulation results show that by adjusting pipe-cubage model system parameters, such as cubage, length of pipe, and diameter of pipe, the standard pulse can be produced.