Journal of South China University of Technology(Natural Science) >

2024 , Vol. 52 >Issue 12: 32 - 42

DOI: https://doi.org/10.12141/j.issn.1000-565X.230636

Mechanical Engineering

Analysis and Control of Assembly Deviation of Large-Size Thin-Walled Shell Based on Improved Jacobian-Torsor Model

  • YI Yali ,
  • YANG Zeyu ,
  • WEI Rui ,
  • ZHAO Minjie ,
  • JIN Herong
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  • 1.School of Mechanical Engineering，Yanshan University，Qinhuangdao 066004，Hebei，China
    2.Beijing Xinghang Mechanical-Electric Equipment Co. ，Ltd. ，Beijing 100074，China
宜亚丽（1976—），女，博士，副教授，主要从事精密装配研究。E-mail： yiyali@ysu.edu.cn

Received date: 2023-10-12

  Online published: 2024-07-20

Supported by

the Equipment Pre-Research Shared Technology Project(920722MS)

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Abstract

The large-size thin-walled shell has large size and mass, and is easy to deform with strict assembly accuracy requirement. In order to meet the high-precision requirement of spacecraft shell docking assembly, it is necessary to actively predict and control the shell assembly deviation. In this paper, a large thin-walled shell is taken as the research object. Based on the small displacement spinor method, the key characteristic errors of cabin are characterized, the geometric error spinor expression of the cabin and the constraint relationship between the spinor parameters are obtained. Then, the cumulative paths of parallel and series assembly chains considering the key feature errors of the shell are established, the assembly deviation of the cabin is characterized based on the Jacobian spinor theory, and an assembly deviation transfer model of the cabin based on the improved Jacobian spinor is obtained. Moreover, the Monte Carlo simulation method is used to numerically simulate the shell assembly step difference qualification rate of the improved Jacobian-Torsor model, with the results being compared with the simulation analysis results. Based on which, a calculation method for quantifying the contributions of various errors is proposed. Finally, by taking the minimum total processing cost as the optimization objective, and the variation relationship of various errors as well as the requirements of assembly order difference as the constraint conditions, an optimal allocation strategy for cabin tolerance considering the error contribution is proposed. The success rate of cabin assembly and the qualified rate of assembly order difference before and after the optimization are then compared, finding that the proposed method increases the qualified rate from the original 88.12% to 99.56%. The research method proposed in this paper provides theoretical reference for designers to carry out active tolerance design.

Key words： shell assembly; assembly deviation; Jacobian-Torsor; tolerance modeling; tolerance optimal allocation

Cite this article

YI Yali , YANG Zeyu , WEI Rui , ZHAO Minjie , JIN Herong . Analysis and Control of Assembly Deviation of Large-Size Thin-Walled Shell Based on Improved Jacobian-Torsor Model[J]. Journal of South China University of Technology(Natural Science), 2024 , 52(12) : 32 -42 . DOI: 10.12141/j.issn.1000-565X.230636

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