Simplified Modeling and Vibration Analysis of Power and Propulsion System for Torpedo

To reduce the noise of a thermal power torpedo, a method for simplified finite element modeling and vibration response analysis of its power and propulsion system excited by multiple excitation sources is proposed. The finite element model including each vibration isolating link is established. Simplified modeling of the front and rear vibration isolating rings of shafting, the vibration isolating rings of whole power plant and the coupler is carried out, and the static stiffness in each direction is determined by finite element static simulation. Then, the exciting forces of engine, propulsion shafting system and propeller on the model are extracted and applied to the finite element model. The structural vibration response of the shell surface is obtained based on the modal superposition method. This study may provide a reference for design of torpedo vibration isolation and further optimization of vibration isolation parameters.