Modeling deviation propagation of compliant assembly considering form defects based on basic deviation fields
ISSN: 0144-5154
Article publication date: 2 April 2019
Issue publication date: 16 April 2019
Abstract
Purpose
A new deviation propagation model considering the form defects in compliant assembly process is proposed. The purpose of this paper is to analyze the deviation propagation by using the basic deviation fields. In particular, each basic deviation field is defined with a generalized compliance matrix of part.
Design/methodology/approach
First, the form defects of parts may be decomposed into a linear combination of basic deviation fields, which are constructed by the eigen-decomposition of the structure stiffness of parts with ideal dimensions. Each basic deviation field is defined with a generalized compliance of part. Moreover, by analyzing the relationship between the basic deviation fields before and after assembling process, a new sensitive matrix is obtained in which each value expresses the correlation of a basic deviation field between the parts and the assembly.
Findings
This model may solve the deviation propagation problems of compliant assembly with considering form defects. Here, one case is used to illustrate the deviation propagation in the assembly process. The results indicate that the proposed method has higher accuracy than the method of influence coefficient when the entire deviation fields of parts are considered. Moreover, the numerical results with the proposed method basically agree with the experimental measurements.
Research limitations/implications
Owing to the hypothesis of linear superposition of basic deviation fields, the research in this paper is limited to the parts with linear elastic deformation. However, the entire form defects of parts are considered rather than the deviations of the local feature points. It may be extended to analyze the three-dimensional deviations of complex thin-walled parts.
Originality/value
A deviation propagation model considering parts form defects is developed to achieve more accurate predictions of assembly deviation by using the basic deviation fields.
Keywords
Acknowledgements
The work described in this paper is supported by grants from the National Basic Research Program of China (grant number 2014CB046600), the National Science Foundation of China (NSFC) under grant 51305256, the National Basic Research Major Project (grant number JCKY2014203A001) and the National Key Projects (grant number 2015ZX04002101). The authors are grateful for these financial supports.
Citation
Li, Y., Zhao, Y., Yu, H. and Lai, X. (2019), "Modeling deviation propagation of compliant assembly considering form defects based on basic deviation fields", Assembly Automation, Vol. 39 No. 1, pp. 226-242. https://doi.org/10.1108/AA-06-2018-076
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited