The torsional vibration calculations of the complicated multi-branched system with rigid connection and flexible connections made up of elastic-coupling parts are very difficult to perform using conventional methods. In this paper, a modal synthesis method of torsional vibration analysis for the system is proposed. This approach is an improved method of Hurty’s fixed-interface and Hou’s free-interface modal synthesis methods. Because of the introduction of flexible substructure, the improved modal synthesis method can effectively treat the complicated system in which there exists a rigid connection and a flexible connection that is formed by an elastic-coupling part. When the calculation is performed, the complicated multi-branched system is divided into several substructures that are analyzed by FEM (finite element method) except the special elastic-coupling part that is defined as flexible substructure and treated individually. The efficiency of modal synthesis is improved by choosing suitable number of lower-frequency modes in modal synthesis. As an example of an application of this method, the analysis of torsional vibration of a cam-type engine shafting system is carried out both numerically and experimentally. The results show that the above kind of multi-branched shafting system can be analyzed effectively by the proposed method.
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July 2003
Technical Papers
Torsional Vibration Analysis of Complicated Multi-Branched Shafting Systems by Modal Synthesis Method
Chun-Ping Zou,
Chun-Ping Zou
School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
Department of Mechanical and Power Engineering, East China Shipbuilding Institute, Zhenjiang, People’s Republic of China
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Duan-Shi Chen,
Duan-Shi Chen
School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
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Hong-Xing Hua
Hong-Xing Hua
School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
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Chun-Ping Zou
School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
Department of Mechanical and Power Engineering, East China Shipbuilding Institute, Zhenjiang, People’s Republic of China
Duan-Shi Chen
School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
Hong-Xing Hua
School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received November 2001; revised November 2002. Associate Editor: B. Yang.
J. Vib. Acoust. Jul 2003, 125(3): 317-323 (7 pages)
Published Online: June 18, 2003
Article history
Received:
November 1, 2001
Received:
November 1, 2002
Online:
June 18, 2003
Citation
Zou, C., Chen , D., and Hua, H. (June 18, 2003). "Torsional Vibration Analysis of Complicated Multi-Branched Shafting Systems by Modal Synthesis Method ." ASME. J. Vib. Acoust. July 2003; 125(3): 317–323. https://doi.org/10.1115/1.1569949
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