Applied Mechanics and Materials Vols. 427-429

Abstract: In order to study the dynamic characteristics of centrifuge facility-vibration shaker system, In the establishment of centrifuge facility-vibration shaker system multi-body dynamic model based on virtual mocking technology, the virtual dynamic model of the entire centrifuge facility-vibration shaker system more close to reality is built up by the transmission of finite element of flexible centrifuge arm. This paper describes how to build the 3-D virtual prototype of centrifuge facility-vibration shaker system by using Pro/e and ADAMS software, and how to create the modal neutral file of the centrifuge arm by using ANSYS software. Considering the system as a rigid-flexible coupling system, the dynamical simulation is carried out, and the results are benefit for the further research of its kinetic behavior, dynamic and variable characteristics basis and the design of such system.

Abstract: The effect of the cavity design parameters on the integrated performance parameter net thrust of hypersonic vehicle was investigated by computer numerical simulation methods in this paper. The cavity design parameters include position value XL and length-to-depth ratio L/D. The research purpose of the paper is to develop ideas for the integrated design of hypersonic vehicle. The studied results show that the effect curve charts of the ratio L/D on net thrust are similar at variable cavity positions. The extreme value of net thrust is obtained at some value of L/D. The fuel mixture touch underside step of the combustor easily to cause eddy loss which make against combustion and lead to net thrust descend while the cavity locates down step in the combustor. While the position of cavity on more combustor back, the combustion process is not built completely and the gas is exhausted quickly, which induces the more net thrust loss.

Abstract: The research came up with a road adhesion coefficient estimation method for electric vehicle under tire cornering condition, compared with the previous researches that mainly focused on tire longitudinal behaviors. The designed identification method first distinguishes the states of small longitudinal slip and large longitudinal slip in the condition of tire cornering. Then estimation algorithms for the two conditions above operate respectively. By designing the simulation and selecting typical road conditions, the applicability and validity of the algorithm have been verified. The estimation method can be used to serve the electric vehicles dynamics stability control system.

Abstract: The purpose of this article is to analyze the energy savings of drive technology for permanent magnet in pumping systems applications. Studied the system structure and working principle of permanent magnetic actuator, according to the production parameters of pumping system collected before and after installation, drew the superimposed slip torque characteristic curve for the motor, analyzed the movement of rod load and the crank shaft, and to study the changes for rod power and active power of pumping system. did data comparison and analysis, showed that the magnet actuator improves the dynamic performance of pumping system, decrease the fluctuations of load and torque and reduced installed power of drag motor, theoretical analysis matched experimental results, confirmed the drive technology for permanent magnet in pumping system applications have a good energy saving effect.

Abstract: In order to improve the cooling effect of cable ultraviolet cross-linking irradiation box, the structure of spreader plate, reflector and outlet were improved. Then the 3D solid model of the irradiation box was established and the numerical simulation of turbulent flow field was performed due to the principle of Computational Fluid Dynamics (CFD). On this basis, the flow fields characteristics inside the irradiation box of original and improve programs were analyzed. The results showed that volume air flow of the new program increased by 36.6% and air velocity around the mercury lamp and XLPE cable surface was increased, so the better cooling effect can be achieved in the new program.

Abstract: In order to solve the force deformation of the hydrostatic center frame in the heavy type horizontal lathe, a simulation research concerning pressure field of hydrostatic center frame was described. The Finite Volume Method of CFX has been used to compute three-dimensional pressure field of gap fluid between the rotation workpiece and bearing pillow. This research theoretically analyzes the influence of angular velocity on the bearing pressure performance according to lubricating theory and computational fluid dynamics, and it has revealed its pressure distribution law of gap oil film. The simulation results indicate that an improved characteristic will be affected by rotating velocity easily, and oil cavity pressure creases by gradually with rotating velocity enhancing. Through this method, it can provide reasonable data for design, lubrication, experience and force deformation computation for hydrostatic center frame in the heavy type horizontal lathe.

Abstract: By the relevant engineering and manufacturing of food rheological properties to estimate, and developing unified object based on 2D/3D dynamic finite element model, to carry out physical model simulation of five elements, then to further extended to deal with heterogeneous hierarchical objects. There are three kinds of food raw materials that are tested, its deformation and mechanical behavior are also assessed, and then according to the optimization FE, it is proposed to estimate the object's rheological properties. The results show that the FE model and the estimation method can accurately reproduce food rheological and deformation, and in the manufacturing process, the finite element model can be used to predict the rheological behavior of food products.

Abstract: The clamber animal foot pads were researched by the Super Depth of Field3D Microscopic System marked VHX-600 and the flexible non-smooth surface friction mechanism of clamber animal foot pad was analysed through bionic tribology. The total friction includes two aspects: a) The sliding friction caused by the adsorbability between clamber animal foot pad and external surface. b) The embedding resistance caused by the external surface micro particles embedded into clamber animal foot pad. The mathematical model of single convex hull was built and the different center distance bionic surfaces were designed, the friction contact simulation of bionic surface was done by ANSYS and the friction performance of bionic surface was verified through the plane friction testbed.

Abstract: Emulate and analyze the flow field of whole-quantity-type safety valve using CFX. Establish the test system of whole-quantity-type safety valve. Compare the simulation results and the experimental results. Verify the accuracy of the simulation results. Provide a theoretical basis for structural innovation and fault diagnosis of whole-quantity-type safety valve.

Abstract: To study the principle of magnetic field and loss at the end region of large 4-poles large turbine generator, 3D transient electromagnetic field finite element (FE) models of the end region are established respectively. Considering the factors such as rotor motion, core non-linearity and time-varying of electromagnetic field, the anisotropic heat conductivity and different heat dissipation conditions of stator end region, a 50Hz, 1150MW, 4-poles large turbine generator is investigated. The magnetic field and loss at no-load condition of the generator end region are calculated and the calculation results are compared with the test data. The result shows that the calculation model is accurate.