Advanced Materials Research Vols. 765-767

Abstract: An office room combined with a two stage parabolic trough concentrating photovoltaic/thermal (TTCSPV/T) and photovoltaic (PV) ventilated glazing simulation of luminous intensity distributions curves (LIDC). Using CAD software to create three-tunnel models to reflect light at the entrance of the arc angle are 30 degrees, 37.5 degrees, and 45 degrees. These models import into the TracePro individually to make illumination analysis, and then run the overall office space TracePro brightness analysis. Choosing the best effective arc angle set run the FLUENT temperature analysis. Finally, We hope the findings of this study can help people choose their energy savings technology.

Abstract: Existing 3D model retrieval techniques focus on the global feature more than local detailed feature are not applicable to 3D CAD models. This paper combines the local feature and global feature to satisfy the needs of mechanical design. We first analyze the limitations of Shape Description (SD) algorithm. Then propose an automatic feature extraction technology based on the local characteristics of the curvature distribution. Next we fuse the extracted feature using a novel method. Lastly, we design an improved K-nearest neighbor algorithm to retrieve models. Experimental results indicate the efficiency and feasibility of the proposed method.

Abstract: Computational intelligent algorithm in modern life, more and more extensive application in engineering practice, is mainly used to solve the automatic layout optimization problems, the research on it has important significance. This paper mainly studies intelligent computing algorithm in automatic layout optimization problem in the application, intelligent computation algorithm contains more categories, such as genetic algorithm, ant colony algorithm, simulated annealing algorithm, the algorithm in solving automatic optimum layout problem, have its distinctive place.

Abstract: This paper is concerned with a Lotka-Volterra predator-prey system with ratio-dependent functional responses and feedback controls. By developing a new analysis technique, we establish the sufficient conditions which guarantee the permanence of the model.

Abstract: Considering the influence factors of material nonlinearity ,geometric nonlinearity and etc.of air spring with auxiliary chamber in numerical calculations, implement method of airbag nonlinear characteristic ,gas unit, connecting pipe were defined. Finite element model was established in ABAQUS,and vertical characteristic simulation was carried out ,and the results shows that, system static stiffness reduces when increasing in the volume of the auxiliary chamber, but the change in stiffness is not is obvious when the volume increases to a certain degree, and static stiffness also reduces when initial pressure reducing. Simulation results are verified through characteristic test,and both are in good consistency.

Abstract: the paper adopts dynamic simulation software ADAMS for establishing virtual prototype model, and dynamics simulation analysis study is conducted on the impact mechanism in order to better study the impact mechanism in impact vibration composite roller with round idler wheels. The kinematics features and dynamics features are studied. The theoretical curves of rail disk opening size and driving angular velocity is obtained. The rail disk structure is improved, and it is proved through software simulation that the improved mechanism is beneficial for improving the impact efficiency of the roller.

Abstract: The finite element model of rubber bush mountings is built up. And the value of the reduced tilting stiffness is obtained directly by solving the model. The simulation data and the experimental data can be seen to agree very closely. This fully proves the reliability of the simulation model. Based on this simulation model, which has been parameterized, the influence of the axial length and inner and outer radii on the reduced tilting stiffness of rubber bush is studied by using the co-simulation of MATLAB and ANSYS.

Abstract: With a classical 4 degrees of freedom linear dynamic model of vehicle-trailer system in the yaw plane, preliminary study on lateral stability is carried out by means of analyzing systems damping ratio. The results show that structural parameters have important influence on lateral stability of vehicle-trailer system. Based on that study, a concept of critical velocity with zero damping ratio as an index is present. With the help of MSC.ADAMS, a multi-body dynamic model of a real vehicle-trailer system is built subsequently and the dynamic responses of vehicle-trailer system running on flat road and rough road is simulated respectively. The simulation results indicated that the characteristics of lateral stability of both of the linear dynamic model and the multi-body dynamic model running on flat road are similar. The critical velocity of multi-body dynamic model running on rough road decreases due to the disturbance from road. Since effects of road, nonlinear wheels, suspension structure and load transfer are taken into consideration, multi-body dynamic model of vehicle-trailer system running on the rough road could be more perfectly characterizing the lateral stability of vehicle-trailer system.

Abstract: This study provides a detailed instantaneous heat transfer solution in a cylinder during a motored cycle. The piston-cylinder assembly is modeled by a two-dimensional cavity with a sinusoidal moving wall. A high order differential algorithm is used to solve the unsteady compressible Navier-Stokes equations. The order of differencing is raised progressively from the walls toward the center of the cylinder, enabling oscillation free and accurate calculation on a very coarse grid. The numerical fluxes are integrated based on the dual-time stepping of the preconditioned matrix with a third-order Runge-Kutta scheme. The absolute pressure is determined by enforcing the global mass conservation for each grid. The predicted results of the absolute pressure, temperature, and velocity components of the fluid inside the cylinder at any instant during the start-up and the periodically stable periods are compared well with the results given in the literature.

Abstract: Dynamics model of mechanical system and hydraulic system inclued electro-hydraulic proportional valve of Proportional-Valve Hydraulic Power Steering were established.and simulation model of assisted characteristic of PVHPS system was build .Response characteristic of proportional valve bypass flow was analyzed at different speed, and higher of the speed, greater of the flow in the bypass flow is . Steering wheel torque increases gradually as vehicle speed increases at the same wheel angle, and driver's better steering road feeling can be ensured. As wheel steering torque increases, assisted oil pressure increases and higher the speed is , slowly oil pressure increases, and assisted oil pressure increases quickly at low-speed steering condition, and increases slowly at high-speed condition,which meet the requirement of low-speed steering agility and high-speed road feeling.