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Variable-stiffness composite cylinder design under combined loadings by using the improved Kriging model

Acta Mechanica Sinica 2019年第1期35卷 201-211,I0006页

作者： Jifan Zhong Yaochen Zheng Jianqiao Chen Zhao Jing Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Wuhan 430074China

The large design freedom of variable-stiffness (VS) composite material presupposes its potential for wide engineering application. Previous research indicates that the design of VS cylindrical structures helps to increase the buckling load as compared to quasi-isotropic (QI) cylindrical structures. This paper focuses on the anti-buckling performance of VS cylindrical structures under combined loads and the efficient optimization design method. Two kinds of conditions, bending moment and internal pressure, and bending moment and torque are considered. Influences of the geometrical defects, ovality, on the cylinder's performances are also investigated. To increase the computational efficiency, an adaptive Kriging meta-model is proposed to approximate the structural response of the cylinders. In this improved Kriging model, a mixed updating rule is used in constructing the meta-model. A genetic algorithm (GA) is implemented in the optimization design. The optimal results show that the buckling load of VS cylinders in all cases is greatly increased as compared with a QI cylinder.

关键词： Variable-stiffness composite Optimal anti-buckling design Combined loading ovality Kriging meta-model

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Theoretical analysis on quasi-static lateral compression of elliptical tube between two rigid plates

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Applied Mathematics and Mechanics(English Edition) 2015年第8期36卷 1005-1016页

作者： Ruirui LIU Haibo WANG Jialing YANG Hua LIU Yuxin SUN School of Aeronautic Science and Engineering Beihang University Jiuquan Satellite Launch Center

Based on the rigid plastic theory; the load-deflection functions with and without considering the effect of strain hardening are respectively derived for an elliptical tube under quasi-static compression by two parallel rigid plates. The non-dimensional load-deflection responses predicted by the present theory and the finite element simula- tions are compared, and the favorable agreement is found. The results show that strain hardening may have a noticeable influence on the load-deflection curves of an elliptical tube under quasi-static compression. Compared with the circular counterpart, the ellip- tical tube exhibits different energy absorption behavior due to the difference between the major axis and the minor axis. When loaded along the major axis of a slightly oval tube, a relative even and long plateau region of the load-deflection curve is achieved, which is especially desirable for the design of energy absorbers.

关键词： elliptical tube strain hardening ovality quasi-static lateral compression

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The calculation of the Reproducibility Error in the technological system with the clamp on the gas power

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自动化博览 2011年第S2期28卷 169-172页

作者：沈兴东郑士成天津职业大学机械工程与自动化学院

The paper deduced a calculation formula by the classic control theory on the Reproducibility Error of parts processing in the technology system,the flexible clamp system, with the clamping device on the gas power,and analyzed its influencing factor with examples,the Reproducibility Error law:\ The larger the diameter of the cylinder,the smaller the error; the slower the tool speed,(k values smaller),the smaller the error.

关键词： Cylinder clamping Reproducibility Error transfer function ovality

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The calculation of the Reproducibility Error in the technological system with the clamp on the gas power

The calculation of the Reproducibility Error in the technolo...

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第五届ABB杯全国自动化系统工程师论文大赛

作者：沈兴东郑士成天津职业大学

The paper deduced a calculation formula by the classic control theory on the Reproducibility Error of parts processing in the technology system,the flexible clamp system,with the clamping device on the gas power,and analyzed its influencing factor with examples,the Reproducibility Error law:The larger the diameter of the cylinder,the smaller the error;the slower the tool speed,(k values smaller),the smaller the error.

关键词： Cylinder clamping Reproducibility Error transfer function ovality

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