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RISS 인기검색어
- 검색키워드
- 저자 : Baotong Li (검색결과 3 건)
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An Intelligent Computational Approach for Design Optimization of Stiffened Engineering Structures
Baotong Li,Liuhua Ge,Jun Hong 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.7
This paper has proposed an additive design method for the design of stiffening topology of load-bearing structures in a growth manner. The idea of the method is drawn from the observation that branching structures in nature (e.g., leaf venation) can effectively support a relatively large structure or perfuse a relatively large region. The excellent performance of branching structures is considered as a result of their adaptive growth with respect to the environmental conditions and their configuration features of branching and hierarchy. To apply the principle of adaptive growth to stiffener layout design, a mathematical model for growth simulation is constructed. Based on this, an evolutionary algorithm is developed to implement the adaptive growth of stiffeners. A numerical treatment called “stiffness transforming operation” is introduced to enable stiffeners to grow along arbitrary directions and thus form optimized stiffener layouts. The effectiveness of the proposed method is verified with numerical examples.
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Influence of Structural Parameters and Tolerance on Stiffness of High-Speed Ball Bearings
Zhaohui Yang,Baotong Li,Tianxiang Yu 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.11
High-speed ball bearings are widely used in aerospace, high-speed machining tool and other complex mechanical systems. And the stiffness is one of most critical parameter of bearings to decide the machine performance. This paper attempts to construct a 5-DOF stiffness matrix based on quasi-dynamic model of high-speed ball bearings to analyze the variation of stiffness with different work condition precisely, and the variation of stiffness with structural parameter and manufacturing errors are calculated for the optimization of tolerance. In this method, the effect of combined loads and lubrication effect are considered, which can achieve high precision analysis of the relationship between contact load and displacement. And then a 5-DOF stiffness matrix can be calculated precisely. The results can be used to optimize the design bearing for improving stiffness.
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Jun Hong,Baotong Li,Yubao Chen,Huei Peng 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.10
The engine cylinder head is one of the most critical components in an automotive powertrain system. Yet, it has the most complicated mechanical structure coupled with a sophisticated combustion process. This study attempts to develop a concrete and practical procedure for the optimal design of the engine cylinder head. First, a simplified topological model composed of beam, shell and membrane elements is developed to simulate the real cylinder head. With this model, the finite element method can be easily and economically employed to study the load-bearing mechanism of the cylinder head under actual engine operation conditions. After characterizing the stress/strain behavior of all the key components through parametric analysis, a new optimization criterion is developed based on Lagrange conditions. This criterion provides an opportunity to represent the ideal ‘balanced point’ among the main design parameters of the cylinder head in terms of weight distribution of the key components. Finally, the optimization of the cylinder head structure is implemented successfully based on these findings. Compared to the optimization results from commercial software, the proposed approach is able to produce a much better solution in respect to both the convergence speed and the final value of the objective function.
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