門式起重機金屬結構可靠性穩(wěn)健優(yōu)化設計研究
[Abstract]:Gantry crane is widely used as a kind of large crane transportation equipment. Metal structure is an important part of gantry crane, which occupies more than 60% of the weight of the whole crane. The main function is to bear and transmit all kinds of loads acting on the crane, and its design level directly affects the working performance and safety performance of the crane. The application of finite element analysis theory and deterministic optimization method improves the problems existing in traditional design to some extent, but there are many uncertain factors in the design, manufacture and use of crane. The deterministic optimization results do not necessarily meet the requirements of engineering practice for safety. The reliability theory and robust design method are applied to the optimization design of crane structure to achieve an effective balance between the safety performance and the economic performance of the product. At the same time, in order to reduce the calculation cost and improve the computational efficiency, an optimization method is proposed to replace the finite element simulation program with the agent model. In this paper, the metal structure of a certain type of gantry crane is taken as the research object. Firstly, the APDL command flow program is compiled to establish the parameterized finite element model to meet the accuracy requirements, and then the static analysis is carried out, and then the Ansys software is integrated with the Isight software. The experimental design method is used to obtain the sample data reflecting the key design parameters and response relationship of crane, and the RBF-NN agent model is used to fit the sample points to construct the high precision structural performance function and limit state function agent model. Based on the agent model of limit state function, random perturbation technique is used to obtain the structural reliability index as the constraint, and the sensitivity additional item is added to the constraint condition for robust design. Finally, the reliability robust optimization design is achieved. Compared with the general optimal design, the design results can effectively improve the reliability and robustness of the design scheme, and have a certain practical significance.
【學位授予單位】:太原科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TH213.5
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