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Abstract

The combined effect of geometrical deviations and jointed deformation in the assembly process are essential for the assembly accuracy of large closed thin-walled cylindrical structures, such as roundness and flatness of the edge, which determines the further assembly between two cylindrical structures. In this paper, a new geometrical deviation propagation model is proposed for large closed cylindrical structures with high local stiffness, in which the geometrical deviation, jointed deformation, and coordinated deformation in the closed assembly process are considered simultaneously. The constraint conditions of the dimensional deviations and shape deviations are derived by small displacement torsor. A virtual deviation feature is developed to describe the equivalent deviation caused by jointed deformation of two cylindrical parts. The correlation of the structural stiffness between unenclosed structure and closed cylindrical structure are established and the geometrical accuracy is obtained by the deformation coordinated conditions. The quantitative index of deviation contribution between parts and assembly is developed based on the deviation propagation model. The influence of geometrical deviation and jointed deformation on the geometric accuracy of assembled structure is revealed. The new deviation propagation model is verified by the experimental data, which may be used for prediction and control of assembly deviation for large closed thin-walled cylindrical structures with high local stiffness.

Keywords

Deviation propagation geometrical deviation jointed deformation virtual deviation feature large closed structure

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Assembly deviation analysis for large closed thin-walled structures with geometrical deviation and jointed deformation

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