Error sensitivity analysis of a microassembly system with coaxial alignment function
Abstract
Purpose
The purpose of this paper is to analyze the sensitivity of the motion error parameters in microassembly process, thereby improving the assembly accuracy. The motion errors of the precision motion stages directly affect the final assembly quality after the machine visual alignment.
Design/methodology/approach
This paper presents the error parameters of the in-house microassembly system with coaxial alignment function, builds the error transfer model by the multi-body system theory, analyzes the error sensitivity on the sensitive direction using the Sobol method, which was based on variance, and then gets the ones which made a great degree of influence. Before the sensitivity analyzing, parts of the error sources have been measured to obtain their distribution ranges.
Findings
The results of the sensitivity analysis by the Sobol method, which was based on variance, are coincident with the theoretical analysis. Besides, the results provide a reference for the error compensation in control process, for the selection of the precision motion stages and for the installation index of the motion stages of the assembly system with coaxial alignment.
Originality/value
This kind of error sensitivity analysis method is of great significance for improving the assembly accuracy after visual system positioning, and increasing efficiency from the initial motion stage selection to final error compensation for designers. It is suitable for general precision motion systems be of multi-degree of freedom, for the method of modeling, measuring and analyzing used in this paper are all universal and applicative.
Keywords
Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (51127004), (51575052) and (51405025). Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Natural Science Foundation of China.
Citation
Ye, X., Liu, P., Zhang, Z., Shao, C. and Li, Y. (2016), "Error sensitivity analysis of a microassembly system with coaxial alignment function", Assembly Automation, Vol. 36 No. 1, pp. 25-33. https://doi.org/10.1108/AA-02-2015-010
Publisher
:Emerald Group Publishing Limited
Copyright © 2016, Emerald Group Publishing Limited