A Simulation Analysis Method of Assembly Tolerance Oriented to the Deformation of Aircraft Assembly Connection

Abstract

The invention discloses an assembly tolerance simulation analysis method oriented to aircraft assembly connection deformation, and relates to the technical field of aircraft assembly. The assembly tolerance simulation analysis method oriented to aircraft assembly connection deformation includes: selecting mutual connections and dimensions in an assembly body Two assemblies with the largest and smallest stiffnesses form a sub-assembly, and establish a finite element model of the sub-assembly; create a positioning node set and a connection node set on the finite element model of the sub-assembly, and set the positioning node set Boundary conditions are applied to each positioning node of , and a normal unit load is applied to each connection node in the connection node set to obtain the finite element model of the processed sub-assembly; to simulate the finite element model of the processed sub-assembly, Substituting the simulation results into the assembly tolerance simulation model to obtain the assembly tolerance; because the invention fully considers the influence of the normal deformation on the assembly tolerance, so that the prediction result of the assembly accuracy is more accurate.

Description

technical field [0001] The invention relates to the technical field of aircraft assembly, in particular to an assembly tolerance simulation analysis method for aircraft assembly connection deformation. Background technique [0002] With the continuous improvement of aircraft function requirements in today's society, aircraft manufacturing has higher and higher requirements for assembly precision. During the aircraft assembly process, due to components manufacturing errors, positioning errors, tooling installation errors, assembly deformation and accumulation of assembly errors, etc., the assembly accuracy is prone to out-of-tolerance problems during the assembly process, which in turn affects the assembly quality of the aircraft. [0003] In order to improve the aircraft assembly accuracy, the assembly tolerance analysis is currently carried out in the aircraft assembly process design stage to predict the assembly accuracy and optimize the process. However, the existing air...

AI Technical Summary

Problems solved by technology

However, the existing aircraft assembly tolerance analysis method is based on the rigid body assumption, and does not consider the influence of connection deformation on assembly accuracy during the assembly process.

Assembly stress is often introduced in the aircraft assembly process, resulting in springback deformation of the assembly after the assembly connection force is released, seriously affecting the assembly accuracy of the aircraft, especially the normal deformation of the connection point

[0004] In summary, the existing methods do not consider the influence of the normal deformation of the connection point on the assembly accuracy, which leads to low aircraft assembly accuracy and low aircraft assembly success rate.

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