MODEL-BASED ANALYSIS OF THE DYNAMIC BEHAVIOUR OF A 250 KN SHOCK FORCE CALIBRATION DEVICE

摘要

An analysis of the dynamic behaviour of the 250 kN primary shock force calibration device at PTB is presented. Two airborne mass bodies with the force transducer under test are brought to collision, and the generated inertial forces are determined by means of laser vibrometers. Measurements with a heavy transducer revealed modal oscillations which were identified by acceleration sensors. The dynamic system behaviour was analysed with a finite element model. It showed that the elastic coupling between the transducer and the reference mass body causes low-frequency oscillations that have to be taken into account for calibration purposes.