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Fuzzy Control Optimization of Loading Paths for Hydroforming of Variable Diameter Tubes
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作者 Yong Xu Xuewei Zhang +4 位作者 Wenlong Xie Shihong Zhang Xinyue Huang Yaqiang Tian Liansheng Chen 《Computers, Materials & Continua》 SCIE EI 2024年第11期2753-2768,共16页
The design of the loading path is one of the important research contents of the tube hydroforming process.Optimization of loading paths using optimization algorithms has received attention due to the inefficiency of o... The design of the loading path is one of the important research contents of the tube hydroforming process.Optimization of loading paths using optimization algorithms has received attention due to the inefficiency of only finite element optimization.In this paper,the hydroforming process of 5A02 aluminum alloy variable diameter tube was as the research object.Fuzzy control was used to optimize the loading path,and the fuzzy rule base was established based on FEM.The minimum wall thickness and wall thickness reduction rate were determined as input membership functions,and the axial feeds variable value of the next step was used as output membership functions.The results show that the optimized loading path greatly improves the uniformity of wall thickness and the forming effect compared with the linear loading path.The round corner lamination rate of the tube is 91.2%under the fuzzy control optimized loading path,which was increased by 47.1%and 22.6%compared with linear loading Path 1 and Path 2,respectively.Based on the optimized loading path in the experiment,the minimum wall thickness of the variable diameter tube was 1.32 mm and the maximum thinning rate was 12.4%.The experimental results were consistent with the simulation results,which verified the accuracy of fuzzy control.The research results provide a reference for improving the forming quality of thin-walled tubes and plates. 展开更多
关键词 Variable diameter tubes finite element simulation HYDROFORMING fuzzy control
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Warm bending mechanism of extrados and intrados of large diameter thin-walled CP-Ti tubes 被引量:2
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作者 张晓丽 杨合 +2 位作者 李恒 张志勇 李龙 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3257-3264,共8页
In order to develop the warming bending technology of the large diameter thin-walled(LDTW) commercial pure titanium alloy CP-Ti tubes, the warm bending mechanism of the extrados and intrados of LDTW CP-Ti tubes was ... In order to develop the warming bending technology of the large diameter thin-walled(LDTW) commercial pure titanium alloy CP-Ti tubes, the warm bending mechanism of the extrados and intrados of LDTW CP-Ti tubes was researched. By EBSD analysis and Vickers hardness test, the changes of microstructure and strength of the tubes at different bending temperatures of 293, 423 and 573 K, were analyzed. The results show: 1) The extrados of the bent tube deforms mainly by slip, along with few twinning, and the preferred orientation is similar to that of the initial tube; the intrados of the bent tube experiences compression deformation mainly by {1 012} tensile twinning, and the twinning makes the preferred orientation of wall materials change sharply. 2) The Vickers hardness values of both the extrados and intrados of the samples after bending increase greatly; the Vickers hardness values of the intrados are much higher than those of the extrados, and Vickers hardness values of the RD-TD planes are always higher than those of the RD-LD planes, which are related to the different deformation mechanisms. 展开更多
关键词 large diameter thin-walled CP-Ti bent tube warm bending texture TWINNING deformation mechanism
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Influence of deformation zone length on bending radius of SS304 tubes with small diameters manufactured via free bending-based active motion
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作者 Shenghan HU Cheng CHENG +4 位作者 Ali Abd EL-ATY Shuo ZHENG Xunzhong GUO Chunmei LIU Jie TAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第6期420-434,共15页
In three and six-axis free-bending equipment,the deformation zone length(A)is a fixed mechanical structure parameter modified when the relevant structure is redesigned and manufactured.In this study,a six degree of fr... In three and six-axis free-bending equipment,the deformation zone length(A)is a fixed mechanical structure parameter modified when the relevant structure is redesigned and manufactured.In this study,a six degree of freedom(6-DOF)parallel mechanism was used as the control mechanism of the bending die,and a new method of changing the deformation zone length(A)was proposed.Firstly,an idealized geometric model of free bending-based active motion was established.Then,the influence of the deformation zone length(A)on the bending moment and the bending radius of the tube was analyzed.In addition,the finite element simulation and a kinematic model of free bending-based active motion controlled by the 6-DOF parallel mechanism were established,and bending processes of the SS304 tube with different deformation zone lengths were investigated.Afterwards,the impact of the deformation zone length(A)on the bending radius,bending moment,wall thickness,and motion of the parallel mechanism were analyzed.Finally,experiments were carried out on the free-bending equipment based on the 6-DOF parallel mechanism.Experiments verified the rules in the theoretical analysis,finite element simulation,and kinematic simulation. 展开更多
关键词 Bending radius Deformation zone length 6-DOF parallel mechanism Free bending-based active motion Small diameter tube
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THE VELOCITY FIELD OF MULTIPHASE FLOW AND EFFICIENCY OF BIOLOGICAL AERATION FILTER 被引量:5
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作者 CHENG Wen HU Bao-wei +1 位作者 YANG Chun-di CHENG Wen-juan 《Journal of Hydrodynamics》 SCIE EI CSCD 2010年第2期260-264,共5页
Aeration is an important factor affecting the biological aeration filter.With a set of experiment device specially designed for the purpose,and the particle image velocimetry technique,the velocity field of the gas-li... Aeration is an important factor affecting the biological aeration filter.With a set of experiment device specially designed for the purpose,and the particle image velocimetry technique,the velocity field of the gas-liquid two-phase flow is studied under different conditions.The various simulated aeration states were actually applied to the experimental device of sewage treatment,and the results of the numerical simulation were verified.The final experimental results indicate that the most efficient state occurs when the ratio of water in aeration tank h / w =1,the diameter of capillary tubes d=0.6mm and the velocity of bubbles v=0.3m/s. 展开更多
关键词 ratio of water diameter of capillary tube bubbles velocity sewage disposal efficiency
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