Research On The Dynamic Response Of Rotor-Bearing-Isolator System

Controlling the vibration and noise in ships is always playing the important role in the theoretic and practical research of vibration isolation. The ship structural oscillatory issue arose from the dynamical mechanics is the emphases of the engineering research all the while. With the development of the technology,the higher and stricter requests on the capability of the vibration isolation system are brought forward. The influence of the isolator to the dynamical characteristic of rotor system in the ship propulsion plant is investigated in this paper.First of all the various mechanism of vibration reduction is presented in the paper and the modal of single-freedom vibration isolation system is founded and the mechanism is analyzed by the simulation results. The theoretics about vibration isolation. are studied on the results of dynamics simulation.Second the modal of rubber isolator and friction damper is founded and analyzed. The results show that they have superior characteristic and can be used in rotor-bearing system. The two kinds of isolators are applied in single-plate rotor system to testified the vibration reduction efficiency. The vibration of the base is reduced obviously from the transfer of the rotor imbalance force by the response analysis of the system.At last the two modals are applied separately in practical rotor system to evaluate the imbalance response utilizing the finite element method and Newmark numerical arithmetic. From the results we get the influence of isolators to rotor systems and the differences between the two kinds of isolators by comparing with the vibration level difference, the max deformation of the isolator and decay time.