Identification of ’Effective’ Linear Joints Using Coupling and Joint Identification Techniques

[+] Author and Article Information
Y. Ren

School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 2263, Republic of Singapore

C. F. Beards

Department of Mechanical Engineering, Imperial College of Science, Technology and Medicine, London SW7, 2BX, UK

J. Vib. Acoust 120(2), 331-338 (Apr 01, 1998) (8 pages) doi:10.1115/1.2893835 History: Received July 01, 1993; Online February 26, 2008


Almost all real-life structures are assembled from components connected by various types of joints. Unlike many other parts, the dynamic properties of a joint are difficult to model analytically. An alternative approach for establishing a theoretical model of a joint is to extract the model parameters from experimental data using joint identification techniques. The accuracy of the identification is significantly affected by the properties of the joints themselves. If a joint is stiff, its properties are often difficult to identify accurately. This is because the responses at both ends of the joint are linearly-dependent. To make things worse, the existence of a stiff joint can also affect the accuracy of identification of other effective joints (the term “effective joints” in this paper refers to those joints which otherwise can be identified accurately). This problem is tackled by coupling these stiff joints using a generalized coupling technique, and then the properties of the remaining joints are identified using a joint identification technique. The accuracy of the joint identification can usually be improved by using this approach. Both numerically simulated and experimental results are presented.

Copyright © 1998 by The American Society of Mechanical Engineers
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