A Reliability Design Method for Dynamic Characteristics of High Speed ​​Press Base

Abstract

The invention discloses a high-speed press-machine base dynamic-performance reliability design method taking probability uncertainty and interval uncertainty into account. The method includes the following steps that a minimum value of reliability under the influence of interval variables is selected as a reliability index, and a probability-interval hybrid reliability design model of high-speed press-machine base dynamic-performances is constructed; Latin hypercube sampling and a co-simulation technology are adopted to obtain adequate sample points; a polynomial response surface model of functional functions corresponding to the high-speed press-machine base dynamic-performances is constructed; in combination with a genetic algorithm and a design point method, double-layer nested optimization is conducted on the probability-interval hybrid reliability design model, and when the minimum value of the reliability under the influence of the interval variables meets reliability requirements and the functional functions meet accuracy requirements, an optimal solution of the probability-interval hybrid reliability design model is output. By the adoption of the high-speed press-machine base dynamic-performance reliability design method, not only can the reliability design requirements of a base be met, but also the relatively high calculation efficiency can be maintained, and accurate and reliable calculation results are obtained.

Description

technical field [0001] The invention relates to a reliability design method for the dynamic characteristics of a high-speed press base considering probability and interval uncertainty. Background technique [0002] During the working process of the high-speed press, the high-frequency punching force always acts on the base, and its design directly affects the stamping accuracy of the high-speed press and the service life of the matching die. Therefore, in the reliability design process of high-speed presses, higher reliability requirements are put forward for the dynamic characteristics of the base. In the reliability design process of the high-speed press base, there are various uncertain factors, such as material properties, boundary conditions and loads, etc. It is rare for these uncertain factors to exist only in a single type of variable structure, and mixed variables coexist. tends to be more common. Among them, some uncertain factors can obtain enough information to...

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Problems solved by technology

[0003] In order to solve the reliability design problem of the dynamic characteristics of the high-speed press base under the mixed coexistence of uncertain factors in actual engineering, the present invention provides a reliability design method for the dynamic characteristics of the high-speed press base considering probability and interval uncertainty. Under the influence of interval variables, the minimum value of the reliability is used as the reliability index, and the probability-interval mixed reliability design model of the dynamic characteristics of the high-speed press base is established, and the polynomial response surface model of the functional function corresponding to the dynamic characteristics of the high-speed press base is constructed. The genetic algorithm and the improved first-order second-order moment method carry out double-layer nested optimization on the probability-interval mixed reliability design model, the inner layer performs interval analysis, and the outer layer performs reliability analysis based on probability, so that not only the probability reliability can satisfy Reliability requirements can also ensure interval reliability, that is, the reliability requirements can be met in the worst case, and at the same time, it can maintain high calculation efficiency and obtain accurate and reliable calculation results.

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