Fast Solution of Underwater Vehicle Vibration Response Based on POD Method

The proper orthogonal decomposition (POD) method is used to model the shell-motor-rotor coupled system with bearing nonlinearities to reduce the computational cost. The rotor system with 192 degrees of freedom is modeled by the finite element method for the coupled shell-motor-rotor structure. The basic principle of the POD method and its specific expression in the shell-motor-rotor coupled system are introduced. By using the POD method,the shell-motor-rotor coupled system is reduced to 20,18 and 15 degrees of freedom,and the computation time is reduced by more than 94%. The time course curves and spectra of the simplified system and the original system are compared,which verifies the efficiency and accuracy of the POD method.