Abstract
The assembly process for planar closed-loop mechanisms is full of complexity and uncertainty due to joint clearance, link coupling and probable redundant constraint. In order to ensure assembly precision, an algorithm of predicting accuracy for planar closed-loop mechanisms in view of joint clearance and redundant constraint is proposed. Firstly by analyzing the assembly process of a planar fivebar closed-loop mechanism, three components of single-fixed, two-connected and redundant-inserted links are proposed to describe the assembly process of arbitrary planar closed-loop mechanisms which is regarded as successive stacking of those components. Then error models of those components are established based on the linear kinematics and principle of virtual work. Subsequently, an algorithm of precision prediction for planar closed-loop mechanisms is constructed by combining those error models. Finally the extendible support structure of the SAR antenna is used as the numerical example to verify the validity and generality of the proposed algorithm.
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Qiangqiang Zhao received his B.S. degree from Xi’an Jiaotong University, Shaanxi, China, in 2015. He is currently a doctoral candidate in School of Mechanical Engineering of Xi’an Jiaotong University. His major area is the error modeling and kinematic reliability analysis of the multi-loop mechanism with link flexibility and joint clearance.
Junkang Guo recived his Ph.D. degree from School of Mechanical Engineering of Xi’an Jiaotong University, Shaanxi, China, in 2017, and worked as a Visiting Scholar in Graduate School of Engineering Department of Micro Engineering, Kyoto University, Japan, during 2015–2016. Currently, he is an Assistant Researcher at Xi’an Jiaotong University. His major interests are accuracy design of the mechanical system, assembly quality assurance, digital assembly, etc.
Jun Hong received his M.S. and Ph.D. degrees from School of Mechanical Engineering of Xi’an Jiaotong University, Shaanxi, China, in 1994 and 2001, respectively. He is currently a Professor in School of Mechanical Engineering of Xi’an Jiaotong University, where he also is the Principal Assistant. In 2014, he was a Distinguished Professor of Yangtze River Scholar of the Chinese Ministry of Education. His research interests include precision assembly, topological optimization design, modeling and analysis of the high-speed precision spindle, etc.
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Zhao, Q., Guo, J. & Hong, J. Assembly precision prediction for planar closed-loop mechanism in view of joint clearance and redundant constraint. J Mech Sci Technol 32, 3395–3405 (2018). https://doi.org/10.1007/s12206-018-0643-5
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DOI: https://doi.org/10.1007/s12206-018-0643-5