Cabin Assembly Deviation Analysis And Control Strategy Research

It is an important way to improve the success rate of cabin assembly and reduce the step difference of cabin assembly to predict and control the deviation of cabin assembly.In order to meet the production requirements of high efficiency and high precision,this paper carried out the analysis of cabin assembly deviation and the research of control strategy in order to improve the success rate of cabin assembly and reduce the step difference of cabin assembly.Combined with the actual production and manufacturing process of flight equipment,the whole process of the actual cabin assembly process is analyzed,the key links and key problems in the cabin assembly process are identified,the key assembly features affecting the success rate of cabin assembly and the accuracy of the cabin contour assembly are determined by analyzing the structural characteristics and manufacturing difficulties of the cabin,and the cabin assembly step difference in the flight equipment production site is measured.The distribution interval and extreme value of the assembly stage difference of each class were obtained and compared,and the main reasons affecting the success rate and the assembly stage difference of each class were analyzed.Based on the small displacement spinor method,the key characteristic errors of cabin were characterized,the geometric error spinor expression and the constraint relationship between the spinor parameters of cabin were obtained,and the equivalent conversion of deformation error and geometric error of cabin under the action of assembly load and the expression of the same mathematical semantics were realized by the finite element analysis method.The cumulative process of the above errors in the parallel and series assembly chains of the cabin was analyzed,and the assembly deviation of the cabin was characterized based on the Jacobian spinor theory,and the improved Jacobian spinor assembly deviation transfer model was obtained.The mathematical relationship between the success rate of cabin assembly,the assembly step difference and the assembly deviation was established.Based on the assumption that the error was normally distributed within the tolerance range,the Monte Carlo method was used to numerically simulate the above established module assembly deviation transfer model,and the success rate of cabin assembly and the pass rate of assembly step difference at the present stage were obtained.The flexible assembly deviation advanced analysis module of 3DCS was used to conduct simulation analysis on the assembly model of the same cabin segment,and the consistency of theoretical calculation results and simulation results was compared and analyzed to verify the reliability of the theoretical analysis above.In order to identify the error sources that affect the assembly deviation of cabin,a calculation and analysis method of the contribution degree of error sources is proposed based on the transfer model of the assembly deviation of cabin,which quantifies the contribution degree of various errors to the assembly deviation.The minimum total processing cost is taken as the optimization objective,and the variation relation of various errors and the requirements of assembly order difference are taken as the constraint conditions.An optimal allocation strategy for cabin tolerance considering the contribution of error was proposed.3DCS was used to compare the success rate of cabin assembly and the pass rate of assembly order difference before and after optimization,to verify the effectiveness of the optimal allocation strategy.As the technical foundation for the construction of assembly pulsating production line,the above research work can effectively improve the success rate of cabin assembly,reduce the order difference of cabin assembly,and provide theoretical basis and reference for engineering personnel to carry out active tolerance design.