Role of base rotation in spacecraft vibration tests of dynamic flight environments

The the rotation related to the translational motion of the spacecraft/launch vehicle (S/LV) interface was determined by simulation. Simulation results of vibration tests with and without the rotation of the S/LVinterface were compared with the results of flight simulations. Aswept-sine acceleration time history was constructed to simulate a ground vibration test (GVT) excitation, with an acceleration amplitude of 1m∕s² and a sampling rate of 1000 Hz. The time history startedt 2Hz with a sweep rate of 23 octave/min, sweeping for 100 s. The frequency range ranged from 2 to about 62 Hz, including most low-order natural frequencies of the S/LV model.