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Experimental Modal Analysis of Rubber Stern Bearing

JIN Yong;;TIAN Yu-zhong;LIU Zheng-lin

2012, 32 (1): 34-38. DOI: 10.3969/j.issn.1006-1355-2012.01.008

Abstract （1866）

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Since rubber stern bearing has excellent shock absorption and noise reduction performances, it has been applied more and more in navel vessels. Using LMS platform and hammering method, the experimental modal analysis of the whole rubber stern bearing was carried out. The validity of the results was verified by MAC. It is shown that the range of intrinsic frequencies of the bearing from experimental modal analysis is in accordance with that calculated by ANSYS. However, because of the nonlinearity of rubber, the vibration modes of the rubber bearing have some differences from the computation results of ANSYS, while results of frequencies and vibration modes of the metal bush are in good agreement with those from the ANSYS computation.

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Experimental Research on Performance of Water-lubricated Rubber Stern Bearing Based on Vibration Analysis

JIN Yong;LIU Zheng-lin

2011, 31 (4): 64-67. DOI: 10.3969/j.issn.1006-1355-2011.04.015

Abstract （1717）

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In order to reduce vibration and noise of the marine’s stern bearing, the influence of the hardness of the rubber material on vibration of the stern shafting is studied experimentally. The vibration data of the stern bearing is gathered and analyzed through the Pulse vibration analysis platform. Through the analysis of the vibration spectrogram, it is suggested that the hardness of the inner surface of the water-lubricated rubber stern bearing, which usually operates under the conditions of low speed and heavy duty, should reach such a level as 80, and it could be slightly higher for the stern bearing which operates at medium and high speed.

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《Computation Model and Modal Verification for an Engine Mount System Based on Dynamic Stiffness Test》

SONG Xiang-rong;JIN Yong-jun;LI Jian-kang;ZHENG Li-hui

2010, 30 (4): 36-39. DOI: 10.3969/j.issn.1006-1355.2010.04.010

Abstract （1968）

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The practicality and reliability of computation model are the key problems in model building. The dynamic model of the linear system does not adapt to the nonlinearparameter system. In this paper, the stiffness and damping parameters of an engine mount system are obtained in experiments. The corresponding mass matrix and stiffness matrix are used for establishing the dynamic computation model of the engine mount system. The model is validated by relative analysis of operational modal and calculated modal. Results indicate that the computation model including dynamic stiffness parameters is more practical than the traditional model of static stiffness.