Identification of joint dynamics in lap joints

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• 作者：M. Sanati ; Y. Alammari ; J. H. Ko ; S. S. Park
• 关键词：Lap joints ; Joint properties ; Modal parameters ; Experimental modal analysis (EMA) ; Frequency response function (FRF)
• 刊名：Archive of Applied Mechanics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：87
• 期：1
• 页码：99-113
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics; Classical Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-0681
• 卷排序：87

文摘

The dynamics of machine tools are greatly dependent on joints, since they add flexibility and damping to structures. In this study, the linear stiffness and damping of a joint in the transverse direction are obtained using two different methods: the inverse receptance coupling method and the new analytical joint identification (AJI) approach. The former approach finds the joint frequency response function by determining the difference between the response of the assembled structure and those of the substructures. However, the only required data for the AJI method are modal parameters of the assembled structure, which can be measured using experimental modal analysis. The accuracy of these methods is first investigated using numerical simulations. Experiments are then conducted on a structure consisting of two beams attached to one another in a lap joint. The proposed methods are utilized to experimentally extract the joint parameters in the transverse direction. Finally, the effects of varying the joint conditions, including surface roughness and the addition of interfacial materials, are investigated.