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RISS 인기검색어
- 검색키워드
- 저자 : Wenjie Ge (검색결과 5 건)
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Wenjie Ge,Ashraf F. Ashour,Weigang Lu,Dafu Cao 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.2
Experimental and theoretical investigations on the flexural performance of steel reinforced ECC-concrete composite beams subjected to freeze-thaw cycles are presented in this paper. Four groups of reinforced composite beams with different ECC height replacement ratios subject to 0, 50, 100 and 150 cycles of freeze-thaw were physically tested to failure. Experimental results show that the bending capacity decreases with the increase of freeze-thaw cycles regardless of ECC height replacement ratios. However, the ultimate moment, stiffness and durability of ECC specimens and ECC-concrete composite specimens are greater than those of traditional concrete specimens, owing to the excellent tensile performance of ECC materials. With the increase of ECC height, the crack width and average crack spacing gradually decrease. According to materials’ constitutive models, compatibility and equilibrium conditions, three failure modes with two boundary failure conditions are proposed. Simplified formulas for the moment capacity are also developed. The results predicted by the simplified formulas show good agreement with the experimental moment capacity and failure modes. A parametric analysis is conducted to study the influence of strength and height of ECC, amount of reinforcement, concrete strength and cycles of freeze-thaw on moment capacity and curvature ductility of ECC-concrete composite beams.
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Jianqiao Chen,Wenjie Peng,Junhong Wei,Rui Ge 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.4
The present paper addresses the optimal design of composite laminates with the aim of minimizing free-edge delamination stresses. A technique involving the application of particle swarm optimization (PSO) integrated with FEM was developed for the optimization. Optimization was also conducted with the zero-order method (ZOM) included in ANSYS. The semi-analytical method, which provides an approximation of the interlaminar normal stress of laminates under in-plane load, was used to partially validate the optimization results. It was found that optimal results based on ZOM are sensitive to the starting design points, and an unsuitable initial design set will lead to a result far from global solution. By contrast, the proposed method can find the global optimal solution regardless of initial designs, and the solutions were better than those obtained by ZOM in all the cases investigated.
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Topology design and analysis of compliant mechanisms with composite laminated plates
Xinxing Tong,Wenjie Ge,Yonghong Zhang,Zhenfei Zhao 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.2
To improve the small deformation and high stress level in hinge zones of compliant mechanisms with isotropic material, a topology optimization method of compliant mechanisms with composite laminated plates was proposed. Based on the anisotropy and designability of composite laminated plates, a topology optimization model of compliant mechanisms with composite laminated plates was built to maximize the deformable capability. Numerical examples of designing compliant inverters and grippers were investigated to demonstrate the effectiveness of the proposed method. The influence mechanism of layer sequences on topologic shapes, deformation and loading capability were also discussed. The results showed that the deformable capability and stress levels of compliant mechanisms with composite laminated plates were further improved by a reasonable configuration of layer sequences.
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Variation Regularity of Key Performance Indexes Against the Slot Number of Tooth-Coil PMSMs
Zhu Zichong,Ge Wenjie,Mei Lei,Huang Yunkai 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
Tooth-coil permanent magnet synchronous machines (TC-PMSMs) are commonly used in wind power generation and wheelhub propulsion applications. These machines operate at low speeds and have a large number of poles and slots, providing various pole/slot combinations as options. Typically, these combinations have similar performances, making it challenging to choose the best one from diff erent perspectives. This study focuses on 32-pole TC-PMSMs with diff erent slot numbers to understand how key electromagnetic and thermal performance indicators vary with slot numbers. Using the fi nite element method, parameters such as torque density, cogging torque, inductance, fl ux-weakening capability, losses, and temperature rise are evaluated and compared. Prototypes of the wheel-hub TC-PMSM are manufactured and tested on a back-to-back test rig, to validate the analysis results. The fi ndings and conclusions derived from this research can assist in determining the optimal slot number or narrowing down the selection range of competitive pole/slot combinations during the scheme comparison stage.
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Chen, Jianqiao,Peng, Wenjie,Ge, Rui,Wei, Junhong Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.4
The present paper addresses the optimal design of composite laminates with the aim of minimizing free-edge delamination stresses. A technique involving the application of particle swarm optimization (PSO) integrated with FEM was developed for the optimization. Optimization was also conducted with the zero-order method (ZOM) included in ANSYS. The semi-analytical method, which provides an approximation of the interlaminar normal stress of laminates under in-plane load, was used to partially validate the optimization results. It was found that optimal results based on ZOM are sensitive to the starting design points, and an unsuitable initial design set will lead to a result far from global solution. By contrast, the proposed method can find the global optimal solution regardless of initial designs, and the solutions were better than those obtained by ZOM in all the cases investigated.
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