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Shock and Vibration
Volume 2016, Article ID 2016432, 7 pages
Research Article

Online Identification and Verification of the Elastic Coupling Torsional Stiffness

1College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
2Technology Center, CSSC (China State Shipbuilding Corporation) Marine Power Co., Ltd., Zhenjiang 212002, China

Received 17 January 2016; Revised 25 March 2016; Accepted 10 April 2016

Academic Editor: Mickaël Lallart

Copyright © 2016 Wanyou Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


To analyze the torsional vibration of a diesel engine shaft, the torsional stiffness of the flexible coupling is a key kinetic parameter. Since the material properties of the elastic element of the coupling might change after a long-time operation due to the severe working environment or improper use and the variation of such properties will change dynamic feature of the coupling, it will cause a relative large calculation error of torsional vibration to the shaft system. Moreover, the torsional stiffness of the elastic coupling is difficult to be determined, and it is inappropriate to measure this parameter by disassembling the power unit while it is under normal operation. To solve these problems, this paper comes up with a method which combines the torsional vibration test with the calculation of the diesel shafting and uses the inherent characteristics of shaft torsional vibration to identify the dynamic stiffness of the elastic coupling without disassembling the unit. Analysis results show that it is reasonable and feasible to identify the elastic coupling dynamic torsional stiffness with this method and the identified stiffness is accurate. Besides, this method provides a convenient and practical approach to examine the dynamic behavior of the long running elastic coupling.