STUDY ON THE SIMULATION TECHNIQUE OF THE VIRTUAL VIBRATION TEST FOR LIQUID ROCKET ENGINE

摘要

The simulation technique for the sinusoidal vibration test is presented. The virtual shaker system is built up firstly.The rigid-body shaker is modelled using the physical parameters of the real electrodynamic shaker. The transferfunctions of the output accelerations with the input voltages are derived using the bare shaker experiments. Theparameterized models of the shaker are obtained using the curve fitting method. Then the liquid rocket engine ismodelled with finite element method. The modal experiments for single liquid rocket engine are carried out to updatethe finite element model of the engine. Finally the virtual open-loop control sinusoidal vibration test for the engine ispresented based on the coupling of the rigid and flexible bodies. Results show that the virtual vibration test agreeswell with the experiment near the big wave crests. The virtual vibration test could reappear and the simulation resultscan also be displayed visually.