Effect of rubbber vibration isolator replacement on fisheries research vessel "Taka-Maru" vibration characters
2006
Hasegawa, K.(National Research Inst. of Fisheries Engineering, Hasaki, Ibaraki (Japan))
The rubber isolator used for mounting of the main engine on the vessel "Taka-Maru" had been exchanged for the first time in ten years after the construction. Vibration transmission characters from the main engine to the hull structure were compared before and after exchanging of the rubber isolator. Since the rubber isolator has been used for rigid support condition in ten years, the comparison of both conditions mean the difference of rubber isolator applied in the rigid and the elastic support mounting. The following remarks were obtained. It founds that vibration transmission characters from the engine to the hull are showed the different performance for the frequency less than 50Hz. In the case of rigid supporting, the dominant peak level of vibration appeared approximately in 45Hz and this isolation system could not reduce this vibration transmission. Appling the elastic support mounting, this peak is eliminated in the hull, but the new dominant peak level of vibration appears approximately in 15Hz in the hull. This frequency seems to be a resonant frequency of the rubber isolator - engine system where engine is the source of vibration.
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