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Tuesday, July 9 • 10:30 - 13:00

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The longitudinal vibration transmission characteristics of the propeller-shaft-hull system are determined by the thrust bearing dynamic stiffness, which is extremely important for the analysis of the hull dynamics. At present, the dynamic stiffness data for a full-scale marine thrust bearing is not available under shafting operating conditions. Based on full-scale ship, the analytical model of the propeller-shaft-hull system was established in this study. Then, the coupling relationship of the dynamic stiffness between the thrust bearing and the hull pedestal was analyzed based on D'Alembert's theorem, and the formula for calculating the dynamic stiffness of the thrust bearing was derived. A full-scale hull model test rig was built, and the longitudinal vibration transfer functions from the propeller to the propulsion shafting shoulder and the thrust bearing pedestal were measured by the random excitation method in the frequency ranging from 10 to 100 Hz. According to the test results, the thrust bearing dynamic stiffness was figured out. The results show that the thrust bearing dynamic stiffness has strong nonlinearity in the specific frequency range. Finally, the test results of the thrust bearing dynamic stiffness and a constant from the traditional method were applied to the finite element model of the propeller-shaft-hull system and the vibration response from the propeller to the hull was analyzed, finding that there would be a large calculation error if the thrust bearing dynamic stiffness is treated as a constant traditionally.


Qiu Yuanran

PERFORMANCE COMPARISION OF TWO TYPES OF TWO-STAGE MOUNTING SYSTEMT, Naval University of Engineering, Institute of Noise & vibration

Tuesday July 9, 2019 10:30 - 13:00 EDT
St-Laurent 3, Board 01-B
  T12 Underwater & marit. noise, SS02 Ship & harbr noise & vibr