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Li J.-H.,China Institute of Atomic Energy | Pan X.,China Machinery Industry Federation | Sun K.,China Institute of Atomic Energy | Gao J.-B.,China Institute of Atomic Energy | And 3 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology

By using neutron scattering technique, a series of LaNi5-xAlx(x=0.1, 0.25, 0.3, 0.45, 0.5, 0.75) alloys and their deuterides were studied at room temperature. A series of experimental data of LaNi5-xAlx alloys were refined by means of program FullProf. Their space groups are found to be P6/mmm. The alloys' lattice parameters, cell volumes and atomic positions were obtained. It is discovered that Al atoms just substitute a part of Ni atoms which are at 3 g position. Furthermore, it is also learned that the variety of cell volume is almost proportional to the content of Al atoms in the alloys. The refined results of LaNi5-xAlxDy diffraction data show that the deuterides' space groups are still P6/mmm. The varieties of phase components, lattice parameters and cell volumes were analyzed after charging deuterium. Afterwards, the atomic positions and distribution of deuterium atoms in the cell were obtained. Source

Zhang Q.,Hunan University | Pan X.,China Machinery Industry Federation | Le P.,China United Engineering Corporation | Jiang C.,Hunan University
Jixie Qiangdu/Journal of Mechanical Strength

The convex model based on correlation analysis technique is applied to the automobile collision safety reliability analysis combined with the probability model. Make the key component's structure sizes and material parameters in the vehicle collision as the uncertain variable, according to its sample information acquisition with difficulty degree use probability model and convex model describe them. The Latin Hypercube sampling method was adopted to generate the sampling points, and then a second-order respond surface was constructed to approximate the vehicle collision response. The reliability index of the vehicle collision safety based on the hybrid model was obtained. Comparing with the determinate analysis, the reliability-based hybrid model analysis can better reflect the real situation, and provide an instruction for the vehicle safety design. Source

Liu C.,Beijing Institute of Technology | Pan X.,China Machinery Industry Federation | Yan Q.-D.,Beijing Institute of Technology | Wei W.,Beijing Institute of Technology
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology

As the conventional beam streamline theory cannot optimize the blade numbers of torque converter effectively, a 3-D flow field simulation platform for torque converter has been built. The design of experiment (DOE) was adopted to study the influence of blade number on the performance of torque converter, and the blade number was optimized utilizing the response surface methodology (RSM). The results indicate that the blade numbers of pump and turbine have a great influence on maximum efficiency and stall torque ratio, while the blade numbers of pump and stator are the main factors for stall pump torque coefficient. The performance of the torque converter with optimized blade numbers is improved evidently. Source

Cui H.-W.,Beijing Institute of Technology | Pan X.,China Machinery Industry Federation | Yao S.-W.,Beijing Institute of Technology | Yan Q.-D.,Beijing Institute of Technology
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science)

The double arc oil grooves friction pairs in HVD was analyzed in order to reduce the drag torque of hydro-viscous drive (HVD) and decrease the no-load power loss of friction pairs. The iSIGHT integrated optimization design platform of friction pairs in HVD was built based on the computational fluid dynamics flow numerical simulation, the design of experiment (DOE), the response surface methodology (RSM) and the numerical optimization algorithm. The influencing and sensitivity analysis of frictional pairs oil grooves parameters on drag torque was analyzed. The grooves structure parameters were optimized. Results indicate that the drag torque is monotonously decreased with the increasing of the width and depth of oil grooves, and the drag torque is monotonously increased with the increasing of the number of oil grooves. The optimized friction pairs can reduce the drag torque of HVD by increasing the width and depth of oil grooves and reducing the numbers of oil grooves, thus improve the power output of engine. Source

Li C.,Jiangsu University | Huang W.,Jiangsu University | Li K.,Jiangsu University | Han B.,Jiangsu University | Wang Z.,China Machinery Industry Federation
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering

In order to validate the design of an intelligent transformation joint based on hydraulic control and optimize the geometry of flow passages in the joint, a three-dimensional model of the joint is constructed in Pro/E and an unstructured grid is generated in the fluid domain. Then the fluid flow governing equations and boundary conditions are chosen according to the device working principle and characteristics. The standard k-ε turbulence model and wall-function are used to simulate the internal flow field in the joint at four openings of the one-way valve. The distributions of velocity and turbulent kinetic energy are obtained and analyzed using CFD software. Moreover, an experimental device is built to measure the outlet flow rate and the pressure difference between the inlet and the outlet at those openings. By a comparison of numerical analysis and experimental validation, the best opening with lower energy consumption is determined. The experimental results show that the intelligent joint based on hydraulic control can realize an intelligent conversion between the oil production status and the testing states, meeting the requirement on function. Besides, the best internal flow condition, in which the hydraulic loss is small and the velocity is high, is achieved at 50 mm opening. The numerical results are consistent with the experimental data. The results provide a basis for improving device internal structure and enhancing oil production efficiency. © 2016, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved. Source

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