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Haijun Yu,Anrui He,Wenquan Sun,Chihuan Yao,Chao Liu 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.5
This paper deals with the stress distribution problem of steel strips subjected to non-uniform tensile loads at both ends, which induce the transverse in-plane compressive stress and is important for researching the transverse buckling of the steel strip. For stress distribution problem, the traditional fi nite element method (FEM) has acceptable accuracy while it takes too long computing time to be applied to on-site production and the semi-inverse analytical method needs to preset the form of stress solution and gets the solution with a certain error. Thence, a rapid symplectic analytical method for solving stress distribution problem of steel strips is presented, which is based on the Hamiltonian system unlike other traditional method based on the Lagrangian system. Furthermore, the rational and rigorous derivation without any forecast about the form of solution makes the stress result have high precision with short computing time. Finally, the symplectic method is demonstrated be more effi cient and suitable in the on-line calculation by comparing with FEM.
Wenquan Sun,Jian Shao,Anrui He 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.4
Backup roll technology plays an important role in hot strip mill shape control. Varying contact length backup roll (VCR) technology in hot strip mill can increase transverse stiffness of loaded gap, heighten control effect of roll bending, and improve distribution of contact force between backup roll and work roll. However it appears to lack coordination with high-order curve work roll. A new objective function of new generation varying contact length backup roll (VCR plus) design curve is established with considering high-order work roll contour, and simulation is carried out to verify the effectiveness of VCR plus by a two dimensional variable thickness finite element method. The result shows that distribution of contact force between backup roll and work roll is more even in VCR plus technology, and which can extend the useful life of backup roll.
Jian Shao,Wenquan Sun,Anrui He 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.3
The strategies of the welding seam dynamic passing control and feasible loose edge rolling technology are put forward. In the process of cold mill welding, by dynamic regulation roll-gap, bending force and stand speed. The control strategy of reducing tensions between stands and strip edge is achieved. At the same time, the decoupling control strategy of plate shape and thickness can reduce the influence of roll-gap on plate shape and of bending force and stand speed on the steel thickness. Simulation analysis and practical application show that the technology effectively reduces the occurrence of steel strip fracture of tandem cold mill units.
Lightweight design for the aluminum alloy-carbon fiber hybrid structure of the EMU car body
Yiming Shangguan,Wenjing Wang,Anrui He,Wenjun Ma,Honglei Tian 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.12
This paper presents an innovative electric multiple unit (EMU) car body lightweight design approach that integrates structural and material optimizations. The structural lightweight design was carried out by using a sub-frame-based method and the non-dominated genetic algorithm II. The plate thicknesses of 28 car body components were chosen as the optimization design variable. The lightweight material design was realized by replacing the aluminum alloy with composite material. The two-dimensional Hashin criterion was used to analyze and validate the strength of the composite driver’s cab. Results show that after size optimization, the structure weight of the vehicle was reduced from 10964 kg to 8661 kg, which was 21.01 % less than the initial configuration. This modular lightweight design strategy for EMU car body optimization offers valuable insights that could be taken into account in future EMU car body designs.
A Rapid Online Calculation Method of Three-dimensional Plastic Deformation in Strip Rolling
Jian Shao,Chihuan Yao,Chaochao Chen,Wenquan Sun,Anrui He 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.2
Three-dimensional strip plastic deformation model is a key part of shape setup model in hot rolling. The numerical efficiency, accuracy and stability of the method are the main factors that may restrict its online application. Considering the theoretical limitations of existing models, basic equations include equilibrium equations with the effect of shear stress, constitutive equations based on incremental theory, and lubricated friction with the respective coefficients of friction at longitudinal and transverse direction. After normalization of parameters and the asymptotic analysis, the strip plastic deformation model is established, and solved by finite volume method and BICGSTAB algorithm to get the transverse distribution of rolling force of each stand. Compared to the finite element model established by ANSYS software, the new model has reliable results and a short computation time of 31 milliseconds, which show its feasibility of online application.