Dynamic modeling of liquid impulse pressure generator for calibration of pressure sensors

Impulse pressure generator with dropped mass is commonly used for dynamic pressure calibration, but there is always high frequency oscillation in the rising edge of the pressure waveform especially for the low amplitude impulse pressure. Through the dynamic analysis and modeling of the whole process of the impulse pressure generator based nonlinear mass spring system, the corresponding numerical simulations of the process in various cases are carried out. Numerical analysis and experiments show that the repeated collision between the hammer and the piston is the direct cause of high frequency oscillation. Based on the model and experiment, the influence of air, hammer mass, piston size and mass, damping and so on the high frequency oscillation characteristics of impulse pressure is further analyzed. The dynamics model is established to further improve the design basis of the liquid impulse pressure generator, optimize the impulse pressure waveform and extend the lower limit of the range. (C) 2018 Elsevier B.V. All rights reserved.