Uncertain Propagation and Analysis of Pipelines with Manufacturing Deviations

doi:10.3901/JME.2025.16.013

Abstract

Abstract: In order to carry out deviation propagate modeling and pose accuracy uncertainty analysis of aeroengine external pipeline, the length deviation, angle deviation, rotating pipe deviation of pipeline bending, and welding length deviation, warpage angle and warpage direction deviation are defined firstly. Combined with the deviation screw representation method, the product-of-exponential model of pipeline manufacturing deviation propagate is established. Then, based on the industry standard GJB 3054-97, the accuracy evaluation criteria of clamp installation position and pipeline end connection position are specified. On this basis, the uncertainty analysis of the pose accuracy of the pipeline key points is further carried out by combining the uniform manufacturing deviation and the normal probability model, and the parameters global sensitivity of the influence of the deviation component on the overall pose accuracy of the pipeline is obtained. The results show that the deviation screw and exponential product model can provide an effective method for pipeline manufacturing deviation transfer modeling and pose accuracy evaluation. The external pipeline model with nine manufacturing links needs to consider the coupling effects of 36 deviation components, and the overall pose accuracy qualification rate is less than 10%. The first bending and welding link has the most significant influence on the overall pose accuracy of the pipeline. In terms of deviation type, the influence of bending angle deviation on pipeline pose accuracy accounts for more than 75%. Therefore, in order to improve the overall pose accuracy of the external pipeline, the deviation control of the first bending and welding links and the angle of each link should be strengthened in engineering practice.

Key words: external pipeline, bending deviation, welding deviation, deviation propagation, uncertain analysis, parameters global sensitivity

CLC Number:

V233

AN Pengyu, ZHANG Yizhang, LIU Zhonghua, ZOU Dekun, ZHANG Xufang. Uncertain Propagation and Analysis of Pipelines with Manufacturing Deviations[J]. Journal of Mechanical Engineering, 2025, 61(16): 13-27.

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