High-speed press base reliability robust design method considering dynamic characteristics

Abstract

The invention discloses a high-speed press base reliability robust design method considering dynamic characteristics. The method comprises the following steps of establishing a reliability robust design model for the dynamic characteristics of a high-speed press base; sampling design variables and uncertain parameters by adopting a Latin hypercube sampling method and acquiring a response value of a sample point by a cooperation simulation technology; according to input-output information of the sample point, establishing an RBF (Radial Basis Function) neural network model for forecasting index values of the dynamic characteristics of the base in objective and constraint functions; carrying out iterative refinement by utilizing a double-layer nested genetic algorithm on the basis of interval constraint violation, a uniform interval dominance degree and an interval sequence vector so as to obtain the optimal solution of a base design scheme. The method carries out dynamic characteristic reliability robust design on the high-speed press base on the basis of the RBF neural network model according to the actual design requirements of the high-speed press base and can conveniently and rapidly obtain the design scheme of the high-speed press base which accords with the reliability requirement and has robust.

Description

technical field [0001] The invention relates to a reliable and robust design method for the base of a high-speed press considering dynamic characteristics. technical background [0002] During the working process of the high-speed press, its high-frequency punching force is transmitted and finally acts on its base. At the same time, the base at the bottom of the whole machine also bears the gravity from other parts and the inertial force of high-speed moving parts. The effect will cause vibration due to the effect of the excitation frequency. Studies have shown that if the natural frequency of the high-speed press base is close to the power frequency or double frequency, it will cause the base to resonate. Therefore, rationally designing the base structure so that the first few natural frequencies avoid the frequency of the working load can prevent the fatigue damage of the base structure and improve the reliability of the press and the life of the die. On the other hand, ...

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Problems solved by technology

Zang Xianguo et al. published in "China Mechanical Engineering" in 2011 "Reliability Optimal Design of Dynamic Characteristics of Automobile Front Axle" with the goal of reducing the mass of the automobile front axle. When the probability distribution of basic random variables is known, the reliability analysis Combining with the optimization technology, a reliability optimization design method for improving the dynamic characteristics of the automobile front axle is proposed. However, when Zang Xianguo et al. Less than actual robustness needs

In addition, in actual engineering, the probability distribution of uncertainty factors is usually unknown

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