Vibrational Power Flow Of A Ship's Typical Power Equipment Vibration Isolating System

Using vibration-isolating devices is a very import method for vibration isolating and noise reducing of ships and other machines. Because of its setting facility and economical cost, single vibration-isolating device is widely used in surface ships and rotators. And it is so called the typical power equipment vibration isolating system. By using the power flow method, the power flow of a typical power equipment vibration isolating system is calculated and analyzed in this paper.First, the modeling of the system is established on the basis of taking the flexibility of the case, complex exciting forces and moments, and the distributing parameter characters of the isolators into account.Then, the isolator is represented as a discrete spring, a one-dimensional continuous rod and an Euler beam considering the axial forces respectively. The system's power flow using these three models is calculated respectively, and the results are compared. Main design parameters of isolators are discussed as well.Through calculating and analyzing, the following conclusion is finally got: first, vibration-isolating system has different isolating effect for different exciting component; second, using discrete spring model can get relatively exact results for a typical power equipment vibration isolating system at low frequencies; third, at mid and high frequencies, the flexibility of the case and the distributing parameter characters of the isolators have a significant effect on the power flow of the system, a continuous model is needed to be used for exact reach; fourth, the location of the isolators also has some effect on the power flow of the system.