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NUMERICAL SIMULATION FOR LASER BENDING OF SHEET METAL

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Chinese Journal of Mechanical Engineering 1998年第4期11卷 30-35页

作者： Li Weimin Lu Xiuchun Liu Zhubai Li Shihua Mechanical Engineering Institute, Yanshan university Yanshan univ China

The new flexible forming technique of sheet metal laser bending process is numerically simulated by using finite element method of large elastic plastic deformation. The temperature fields and stress strain distribution in deformation area are calculated, forming process is described and relationship between bend angle and width of sheet is discussed. It is shown that the calculated values are in good accordance with the experiments.

关键词： Laser bending Flexible forming Numerical siumlation

APPLICATION OF STEP IN CAD/CAPP INTEGRATION

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Chinese Journal of Mechanical Engineering 1998年第2期11卷 10-16页

作者： Wu, Ruirong Zhang, Heming Qinghua univ China

A brief discussion of the content and methodology of STEP is given, and STEP based strategies for CAD/CAPP information integration is pointed out. A STEP based feature technology in which a three layer feature definition is included is discussed, the content of feature information is analyzed and a stratified CAD feature library is shown. On these bases, a commonly shared part information model is proposed. The architecture of the integrated CAD/CAPP system is presented.

关键词： STEP CAD/CAPP Integration Feature

DEVELOPMENT OF DC MILL——WITH WORK ROLLS DEVIATED AND CROSSED

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Chinese Journal of Mechanical Engineering 1998年第4期11卷 47-52页

作者： Liu Yuli Jin Xiaoguang Lian Jiachuang Kong Xiangdong (Yanshan university) Yanshan univ China

A new type of 4 high strip mill is developed, in which gauge and shape are combinatively controlled by work roll deviating and crossing. The neewly developed 300 mm 4 h mill and its control system are introduced. Both static and dynamic experiments as well as theoretical study are carried out to verify the advantages and the combined shape and gauge control function of this new mill.

关键词： DC mill Shape Control

THREE DIMENSIONAL ELASTO-PLASTIC CONTACT BOUNDARY ELEMENT ANALYSIS FOR ROLLING WITH CONSIDERATION OF FRICTION

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Chinese Journal of Mechanical Engineering 1998年第1期11卷 63-69页

作者： Xiao, Hong Chen, Yiming Shen, Guangxian Aizawa, Tatsuhiko Kihara, Junji Yanshan univ China

The boundary element method in framework is given to evaluate three dimensional frictional contact problems. Elasto plastic material behavior is taken into account by mean of an initial stress formulation and Von Mises yield criterion. The amount of tangential traction at contact surface is limited by Coulomb's friction law and constant shear rule. From some numerical results of a plate rolling problem, it is demonstrated here that the BEM can be used to efficiently and accurately analyze this class of forming problems.

关键词： Strip Rolling Boundary element method Elasto plasticity Contact Friction

NUMERICAL METHOD FOR SOLVING THE EULER EQUATION FOR UNSTEADY TRANSONIC FLOWS OVER OSCILLATING AIRFOILS

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Chinese Journal of Aeronautics 1991年第1期6卷 1-10页

作者： Li FengweiNorthwestern Polytechnical university Northwestern Polytechnical univ

Through transformations, the time-dependent boundary condition on the airfoil contour and the boundary condition at infinity are brought fixed to the boundaries of a finite domain. The boundary conditions can thus be satisfied exactly without increasing the computational time. The novel scheme is useful for computing transonic, strong disturbance, unsteady flows with high reduced frequencies. The scheme makes use of curvefitted orthogonal meshes and the lattice control technique to obtain the optimal grid distribution. The numerical results are satisfactory.

关键词： NUMERICAL METHOD FOR SOLVING THE EULER EQUATION FOR UNSTEADY TRANSONIC FLOWS OVER OSCILLATING AIRFOILS Flow NACA

FORCED VIBRATION AND SOUND RADIATION OF A RECTANGULAR PLATE WITH VISCOELASTIC BOUNDARY SUPPORTS

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Chinese Journal of Mechanical Engineering 1999年第4期12卷 276-281,316页

作者： Fan Zijie Dept of Automotive Eng.,Qinghua university Kim Kwang Joon Dept of Mechanical Eng.,KAIST,Korea Qinghua univ China

A method for the forced vibration and sound radiation of a rectangular plate with viscoelastic boundary supports is *** method is based on damped complex modes analysis *** the damped complex modes of the plate system,the modal equation of the plate motion becomes completely *** sound radiation pressure is obtained by numerical integration of the Rayleigh *** of the viscoelastic boundary supports on the vibration response and the radiated sound pressure of the vibrating plate are discussed by an example.

关键词： Vibration Viscoelastic damping Supports Sound radiation

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Fe_3Al BASED ALLOYS

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 393-404页

作者： D.G. MORRIS(Institute of Structural Metallurgy, Avenue de Bellevaux 51, university of Neuchatel, 2000 NEUCHATEL, SWITZERLAND) univ of Neuchatel Switzerland

The promise for industrial applications offered by iron aluminides is today restricted by insufficient ductility at room temperature and mediocre strength and creep resistance at high temperatures. The tendency to embrittlement in the presence of hydrogen or water vapour limits the ductility even more. The atomic arrangements in binary and alloyed variants are examined here and related to the difficulties of dislocation propagation at room and at high temperatures. In this way the influence of intrinsic structure and alloying modifications on mechanical behaviour can be understood. Possibilities for further improving properties through structure control are considered.

关键词： Intermetallics Aluminides Order Anti-phase boundaries Dislocation structures,Anomalous strengthening Solute hardening.

NEW APPROACHES FOR COMPUTING DYNAMIC LOAD-CARRYING CAPACITY OF MULTIPLE COOPERATING ROBOTIC MANIPULATORS

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Chinese Journal of Mechanical Engineering 1998年第2期11卷 67-72页

作者： Yang Yulin Lu Ling Zhao Yongsheng Zhou Yulin Yanshan university Yanshan univ China

A novel unified method for computing the dynamic load carrying capacity(DLCC) of multiple cooperating robotic manipulators is *** this method,the kinematic constraints and the governing dynamic equations of the multiple robot system are formulated in the joint space by using the method of transference of dependence from one set of generalized coordinates to another,and the virtual work principle,which includes the readily available dynamics and joint torques of individual manipulators,and the dynamic of *** on this dynamic model,the upper limit of the DLCC at any points on a given trajectory is obtained by solving a small size linear programming *** method is conceptually straightforward,and it is applicable also to the cases of multi fingered robot hands and multi legged walking machines.

关键词： Robotic manipulators Cooperating Dynamics Load carrying capacity

NEW METHOD OF EXTRACTING GOLD AND SILVER FROM HIGH SILVER-GOLD CONCENTRATES

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中国有色金属学会会刊：英文版 1995年第3期5卷 50-53页

作者： Song, Qingshuang Wang, Dequan Cheng, Jinju Northeastern univ Shenyang China

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关键词： extraction of gold and silver chloride leach sulphur-ammonia leach cementation