Reliability design method for upper crossbeam of high-speed pressure machine

Abstract

The invention discloses a reliability design method for an upper crossbeam of a high-speed pressure machine. The method includes the steps: selecting design variables according to reliability requirements in practical upper crossbeam design to establish a reliability design model for the upper crossbeam of the high-speed pressure machine, wherein uncertainty factors are described by intervals; in an experimental design, acquiring sample points required for Kriging fitting by means of LHS (Latin hypercube sampling), acquiring an objective function and a constraint function corresponding to each sample point by means of collaborative simulation to construct a Kriging model; calculating reliability constraint values in the reliability design model on the basis of uniform interval dominance degrees; adopting a double-layer nested genetic algorithm based on interval constraint violation degrees to search an optimal design scheme meeting the reliability requirements. According to the practical reliability requirements of the upper crossbeam of the high-speed pressure machine, reliability index values are calculated according to uniform interval dominance degrees in the reliability design, and the design scheme, meeting the reliability requirements, of the upper crossbeam of the high-speed pressure machine can be acquired conveniently and quickly.

Description

technical field [0001] The invention relates to a reliability design method for an upper beam of a high-speed press. technical background [0002] The performance of high-speed presses directly affects the precision, performance and production efficiency of stamping products. As an important part of high-speed presses, the upper beam has a direct and important effect on the overall working performance and processing accuracy of the press. influences. In order to improve the machining accuracy and work efficiency of the press, and reduce production costs and energy consumption, it is necessary to reduce the weight of the upper beam while increasing the stiffness and strength of the upper beam as much as possible. Therefore, it is necessary to target high stiffness and light weight. reliability design. [0003] In the actual design and manufacture of high-speed presses, there are certain uncertain fluctuations in the stress and material properties of the upper beam, which ma...

AI Technical Summary

Problems solved by technology

Probabilistic reliability analysis requires a large amount of sample data to obtain accurate probability distribution information about uncertain quantities. However, only very limited sample data can be obtained in engineering, and probabilistic reliability may be sensitive to the distribution information of random parameters. That is, a small error in the parameters of the probability model can cause a large error in the calculation of the structural reliability

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