Robust equilibrium design method for dynamic characteristics of key component structures of complex equipment

Abstract

The invention discloses a robust equilibrium design method for dynamic characteristics of a key component structure of complex equipment. The method comprises the following steps: establishing a robust equilibrium design model for the dynamic characteristics of the key component structure of the complex equipment; sampling by adopting a Latin superposing method, obtaining sample points through a co-simulation technology, and establishing a Kriging model of each dynamic characteristic index value of a key component structure of complex equipment in a prediction target and a constraint function;performing iterative optimization by utilizing an interval angle coincidence coefficient based on a constraint performance approximate interval and a given interval constant and a genetic algorithm of an overall steady deviation distance, and directly obtaining a design scheme for enabling the dynamic characteristics of the key component structure of the complex equipment to be steady and balanced. According to the method, a set composed of a key component structure target and a constraint performance robustness coefficient is established, the overall robust deviation distance is defined through the minimum robustness coefficient in the set, and robust equilibrium design of the dynamic characteristics of the key component structure of the complex equipment under the mixed uncertain condition is achieved.

Description

technical field [0001] The invention relates to a robust and balanced design method for the structural dynamic characteristics of key parts of complex equipment. Background technique [0002] During the working process of complex equipment, the stress on the structure of its key components is often very complex. In addition to sufficient strength and stiffness, the vibration resistance of the structure of key components must also be considered to ensure that the natural frequency of the structure is far away from the excitation frequency. Taking the high-speed press as an example, in the actual stamping process, the slider of the stamping machine is subjected to high-frequency punching force to reciprocate in the direction of the guide column, and the stamping frequency is 1.33-4Hz. In addition, the working frequency of the slider of the stamping machine is 50Hz. In the design stage of high-speed presses, it is necessary to put forward robustness requirements for the dynami...

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Problems solved by technology

[0004] In order to solve the problem of anti-vibration design of key components of complex equipment in actual engineering, the present invention provides a robust and balanced design method for the structural dynamic characteristics of key components of complex equipment, using probability interval mixed variables to describe the dynamic characteristics affecting the structure of key components of complex equipment Establish a robust equilibrium design model for the structural dynamic characteristics of key components of complex equipment; use the Latin hypercube sampling method to sample design variables and uncertain parameters, obtain sample points through co-simulation technology, and establish prediction objectives and constraint functions The Kriging model of each dynamic characteristic index value of the key component structure of medium and complex equipment; iteratively optimizes the genetic algorithm based on the interval angle coincidence coefficient between the approximate interval of the constraint performance and the given interval constant and the overall robust deviation distance, and directly obtains the key points of the complex equipment. A robust and balanced design scheme for the overall dynamic characteristics of the component structure

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