Optimal design of structural parameters for shield cutterhead based on fuzzy mathematics and multi-objective genetic algorithm
来源期刊：中南大学学报(英文版)2015年第3期
论文作者：XIA Yi-min(夏毅敏) TANG Lu(唐露) JI Zhi-yong(暨智勇) CHENG Yong-liang(程永亮) BIAN Zhang-kuo(卞章括)
文章页码：937 - 945
Key words：shield tunneling machine; cutterhead; structural parameters; fuzzy mathematics; finite element optimization
Abstract: In order to improve the strength and stiffness of shield cutterhead, the method of fuzzy mathematics theory in combination with the finite element analysis is adopted. An optimal design model of structural parameters for shield cutterhead is formulated, based on the complex engineering technical requirements. In the model, as the objective function of the model is a composite function of the strength and stiffness, the response surface method is applied to formulate the approximate function of objective function in order to reduce the solution scale of optimal problem. A multi-objective genetic algorithm is used to solve the cutterhead structure design problem and the change rule of the stress-strain with various structural parameters as well as their optimal values were researched under specific geological conditions. The results show that compared with original cutterhead structure scheme, the obtained optimal scheme of the cutterhead structure can greatly improve the strength and stiffness of the cutterhead, which can be seen from the reduction of its maximum equivalent stress by 21.2%, that of its maximum deformation by 0.75%, and that of its mass by 1.04%.
XIA Yi-min(夏毅敏)1, TANG Lu(唐露)1, JI Zhi-yong(暨智勇)1, 2, CHENG Yong-liang(程永亮)1, 2, BIAN Zhang-kuo(卞章括)1
(1. State Key Laboratory of High Performance and Complex Manufacturing
(Central South University), Changsha 410083, China;
2. China Railway Construction Heavy Industry Co., Ltd., Changsha 410100, China)
Abstract:In order to improve the strength and stiffness of shield cutterhead, the method of fuzzy mathematics theory in combination with the finite element analysis is adopted. An optimal design model of structural parameters for shield cutterhead is formulated, based on the complex engineering technical requirements. In the model, as the objective function of the model is a composite function of the strength and stiffness, the response surface method is applied to formulate the approximate function of objective function in order to reduce the solution scale of optimal problem. A multi-objective genetic algorithm is used to solve the cutterhead structure design problem and the change rule of the stress-strain with various structural parameters as well as their optimal values were researched under specific geological conditions. The results show that compared with original cutterhead structure scheme, the obtained optimal scheme of the cutterhead structure can greatly improve the strength and stiffness of the cutterhead, which can be seen from the reduction of its maximum equivalent stress by 21.2%, that of its maximum deformation by 0.75%, and that of its mass by 1.04%.
Key words:shield tunneling machine; cutterhead; structural parameters; fuzzy mathematics; finite element optimization
