Applied Mechanics and Materials Vols. 543-547

Abstract: In this paper, setting up a mathematical mold for LCM filling process, which contains sink term. The control volume/finite element method is used to build finite element equation for three-dimensional preforms pressure field and get the solution. Numerical simulation of pressure field that resin flowing in three-dimensional dual-scale porous medium is achieved.

Abstract: Efficiency and accuracy of forward problem are important in structural analysis. A real-time algorithm, called coefficient reduced-basis method, is applied to analyze a static problem. A truck frame is taken as an example. Results computed from finite element method, reduced-basis method and coefficient reduced-basis method are obtained. Comparing results from the three methods, coefficient reduced-basis method can get high-precision results quickly, which not separate the design parameters from the linear elastic operators.

Abstract: The gantry beam, which is the key part of the gantry frame is given a static analysis on the stress position with the finite element analysis, and its structure is shelled and optimized. Without changing the geometric size of the gantry beam and increasing the stiffness and strength of gantry beam by adding the strengthening ribs to gantry beam internally, reduce gantry beam quality, optimize the design of beam structure, improve the reliability of beam greatly, which laid the foundation for the further study of the gantry automatic welder.

Abstract: In this paper, the transient characteristics of the permanent magnet synchronous motor based on the space vector pulse width modulation technology are researched in detail. Firstly, the mathematical model of the control system is established. Secondly, the simulation model based on MATLAB/Simulink is built. Thirdly, the transient simulation is implemented by the constructed model. It is proved that the mathematical model is valid and effective, which provides a theoretic base for the design of an actual permanent magnet synchronous motor control system.

Abstract: Compared with crank-slider mechanism, the elbow-bar mechanism has some better dynamic and kinematic (D&K) characteristics for transmitting movement and force as the ultimate output component in mechanical press. The relations of the position, speed and acceleration of the driving and driven components, as the D&K characteristics of crank-slider mechanism, are quite important for analysis and design of the transmission mechanism and its components. All D&K characteristics of each components are established by analytical method, then the numerical simulation is carried out on the base of analytical euqations.

Abstract: Based on the in-depth investigation, analysis and summary of our current domestic dedicated manipulators advantages and disadvantages, this paper applies the concept of "combination" in research process of industrial manipulator. With the principle of functional principle implementing combination, combine part features as module units, so as to form the combined industrial manipulator which would not only satisfy the specificity use requirement, but can realize the design of seriation, standardization, and generalization. The article introduces combination principles, characteristics and various structure forms of simple combined industrial manipulator in detail, and it is believed to have certain reference effect on relevant researches.

Abstract: In order to obtain the optimal cooling water velocity, the relationship between motor spindle temperature and cooling water velocity was derived by using the heat transfer and fluid mechanics. When the cooling water velocity was relatively small, its change has significantly influence on cooling effect; But when the cooling water velocity was relative large, the difference in cooling effect was inappreciable. Motor spindles water cooling system based on the software of ANSYS CFX was established. The cooling water velocity and temperature distribution in circular channel was analyzed. Motor spindle temperature of theory and simulation was compared under different cooling water velocity; Experiments were conducted according to the results of the simulation, Experimental temperature is consistent with simulation results, which verify the validity of motorized spindle simulation analysis and theoretical derivation. The study in this paper provides a reference for the motorized spindle selecting the rational velocity of cooling water.

Abstract: A new electromagnetic drive rope and pulley type downhole blowout preventer is proposed. The moment equilibrium equation of downhole blowout preventer is established. The structural dimensions of the valve plate connecting position of blowout preventer and pulley rope location are optimized. The dynamic simulation of pulley type downhole blowout preventer is carried out to improve the parameters of this new blowout preventer and to improve its motion performance and mechanical properties.

Abstract: Taking a grinding machine tool as an example, this paper obtained the static stiffness of the machine tool by finite element analysis method. The structure and technical parameters of the machine tool were introduced at first.Then, the finite element model of the machine tool was established. The static stiffness of the machine tool in x-, y-, and z-directions were simulated at last. The results show that, the static stiffness in x-direction is 2.0062×10⁷ N/m, the static stiffness in y-direction is 0.821×10⁷ N/m, and the static stiffness in z-direction is 0.2992×10⁷ N/m. This paper provides advices for structure optimization of the machine tool which is convenient for improving the machining accuracy.

Abstract: This paper establishes two-dimensional mathematical model and three-dimensional mathematical model of the mechanical structure elastic-plastic mechanics and according to Hooke's law and Drucker postulate analyzes the plastic relationship of the elastic-plastic mechanics. The first part of the paper introduces the parameter setting of finite element analysis of elastic-plastic mechanics. The second part establishes computer simulation model of elastoplastic. Finally, it analyzes bolt force using ANSYS software and applies it to computer simulation of elastoplastic force and air resistance of gymnast in the process of action showing which provides technical reference for the training of gymnasts.