Method of locating and controlling abnormal vibration of engine room structure of research ship
In view of the abnormal structural vibration phenomenon in the engine room of a research ship during the mooring stage,the frequency domain analysis method was used to identify the structural noise sources and analyze the vibration transmission by combining with the vibration test data of the real ship.The data analysis results showed that the abnormal vibration frequency of the deck was the same as the frequency of the generator foot,and the inherent mode of the intermediate mass was calculated by finite element simulation.It is inconsistent with the fundamental frequency,firing frequency and frequency doubling of the generator set.Therefore,the possibility of abnormal vibration caused by the resonance between the generator set and the intermediate mass is excluded.Combined with the on-board inspection,the abnormal structural vibration fault is located in the fuel oil pipeline system.According to the vibration spectrum characteristics of different measuring points of diesel engine,it is concluded that there is a positive correlation between the base vibration of generator set and the fuel pipe vibration.Therefore,the vibration control of the piping system was carried out in the follow-up test.The results show that the abnormal structural vibration of the engine room attenuates after the vibration reduction of the fuel pipe system,the vibration isolation effect of the double-layer vibration isolation device of the generator set is increased from 20.8 dB to 36.6 dB,and the deck vibration velocity is reduced from 25.3 mm/s to 8.1 mm/s,indicating that the problem of abnormal structural vibration of the engine room has been satisfactorily solved.
Research shipStructural vibrationVibration locationVibration controlVibration isolation effect
万方数据
维普
