Dynamic Characteristics of Undersea Vehicle Power Plant

To control radiation noise of undersea vehicles, a detailed power plant model of undersea vehicle, including such as engine and fuel pump, is established, and the virtual prototype modeling is completed. Based on the virtual prototype, the motion characteristics and forces on the major parts, such as piston, body of pneumatic valve, damping pad and seawater pipe, are analyzed. It is found that: 1) the abrupt change of the piston’s acceleration and the disengagement of the valve body from valve seat are the main causes of axial vibration; 2) due to the influence of the assembly position, the six damping pads have equivalent radial load values and the same stressing regularity, but their axial forces are quite different; 3) the axial force of the seawater pipe exhibits a single-frequency period characteristic. It is suggested that in engineering design, the stiffness of the damping pads should be distinguished, and flexible seawater pipe should be substituted for rigid one, which may facilitate reduction of the radiated noise.