Research On Design And Performance Of The Double-layer Vibration Isolation System For A Sightseeing Ship Fan

The vibration and noise performance of marine power equipment is directly related to the comfort of the ship.Therefore,it is of great significance to study the vibration reduction and noise reduction of marine power equipment.In this paper,the vibration and noise of a sightseeing ship in Chaohu Lake are studied.The research results provide reference for solving the vibration and noise problems of sightseeing ship.In this paper,a tourist ship in Chaohu Lake is taken as the research object.According to the vibration and noise problems complained by tourists,the vibration and noise of cabin and power equipment of the tourist ship are tested and analyzed first.Through the test and analysis,it is found that the noise of engine room and cabin does not exceed the limit value specified by IMO,and the vibration of the main engine does not exceed the limit value specified by IMO,only the vibration of the fan foot position is higher Big.According to this analysis,it is possible that the fan causes resonance of the connection structure,which makes the passengers feel very low comfort.For this reason,the vibration isolation system of the fan is mainly analyzed later.A two-layer vibration isolation system was designed for the wind turbine and the vibration transmission characteristics were calculated.In the simulation calculation analysis,the geometric model was first established by using UG software.After importing Ansys software,the finite element model of the fan double-layer vibration isolation system was established,and the modal analysis and harmonic response analysis was carried out.The fan double-layer vibration isolation system mainly includes: a fan,an upper and lower vibration isolator and an intermediate body.The analysis mainly studies the influence of the parameters of the double-layer vibration isolation system on the vibration isolation performance.Finally,the sensitivity analysis of the double-layer vibration isolation system of the fan is carried out.Firstly,according to the quality and size of the fan equipment,the upper and lower vibration isolators are preliminarily selected and designed.Secondly,the middle raft structure of the fan double-layer vibration isolation system is designed.The static deformation of the double-layer vibration isolation system composed of the preliminarily selected vibration isolators.The middle raft and the fan equipment are calculated and checked to see whether the static deformation of each vibration isolator is consistent.Then,the modal characteristics of double-layer vibration isolation system are analyzed to verify whether the natural frequency of the vibration isolation system is similar to the excitation frequency of the fan.The structure of the middle raft is optimized to avoid the excitation frequency of the fan.Then,the vibration isolation performance of the double-layer vibration isolation system of the fan is calculated.Finally,the sensitivity of the frequency response function of the double-layer isolation system to the middle raft is studied.According to the sensitivity distribution of the middle raft obtained from the simulation analysis,the sensitive elements that affect the vibration isolation performance of the system are determined.On this basis,the influence of the raft sensitive element on the vibration isolation performance of the fan vibration isolation system is studied.The results show that the vibration isolation performance of the fan double-layer vibration isolation system can be significantly improved by changing the raft sensitive element.