Rocket tank deviation analysis method oriented to face deviation transmission

Abstract

The invention discloses a rocket tank deviation analysis method oriented to face deviation transmission. The method is realized through the following ways: combing a geometric precision indicator system of a tank based on form and position tolerance requirement on parts in the rocket tank manufacturing and assembling process; performing measurement point optimization by combining a measurement point layout principle according to a specific indictor requirement in the geometric precision indicator system, and establishing a hierarchical measurement point system; determining a basic deformationmode based on the geometric sizes and material parameters of idle parts; and constructing a computation model of a local deviation factor by combining the measured measurement point deviation obtainedbased on the hierarchical measurement point system according to the basic deformation mode, and further determining the statistical data of each deviation factor of each part; and establishing a transmission relation of the local deviation factors before and after the parts assembling based on a deformation coordinate relation before and after the assembling, and predicting the deviation of the assembly after the assembling. The deviation analysis in the large thin-wall component assembling process is realized.

Description

technical field [0001] The invention relates to deviation analysis in the assembly process of thin-walled parts, in particular to a method for analyzing the deviation of assembly of rocket storage tanks transmitted by plane deviation. Background technique [0002] The storage tank is the main component of the launch vehicle, accounting for more than 60% of the total mass of the rocket. It is mainly used for fuel storage and load transfer. The working environment is harsh, and its manufacturing accuracy directly affects the flight accuracy of the rocket. The storage tank has the characteristics of thin wall, large size, and poor self-rigidity. It is easy to deform during processing, and the shape and size of parts are not easy to control. Traditional tank manufacturing and processing precision control mainly relies on engineering qualitative experience and test corrections, lacking systematic error analysis and tolerance allocation methods, resulting in high production costs,...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few deviation analysis methods for rocket tanks. Since the rocket tank is a super-large and thin-walled structure with large size and low stiffness, the deviation of parts and components is distributed in a "field" during the assembly process. The conventional method is based on the deviation of local feature points. The bias transfer method does not adapt to

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