Advanced Materials Research Vols. 690-693

Abstract: Based on the source code of 3D modeling software called Sinovation, the user interface is developed by Visual Studio 2005, then 3-demensional computer aided design (CAD) module of gating system for iron castings is built by the Script language of SINOVATION. The CAD module has a friendly interface, quick and accurate calculation, and is able to design complicated gating system. As the efficiency and accuracy for gating system designing are improved,

Abstract: Tool path is usually described by means of continuous small linear segments. It results in large number of programming points in order to achieve high precision. A construction method of tool path based on arc-cell is presented in this paper, and the tool path is G¹ continuous. The construction method is applied to describe the tool path of wave shape specimen and hill shape specimen. For the two specimens, when their tool paths are described based on continuous small segments, 128212 and 184954 linear segments are necessary, respectively. But when their tool paths are described based on arc-cell, 15838 and 21669 arc-cells are necessary, respectively. And its more important that these arc-cells include information of curvatures and arc-lengths to control acceleration and deceleration.

Abstract: Parting surface design is the key to mold design. Taking mold design of a component as an example, this paper introduces the implementation of a parting surface design of complex multi-cavity mold supported by the surface technique of Pro/E software.

Abstract: Melt blowing is an important process for producing nanofibrous nonwovens. Compared to another technology for producing nanofibrous nonwovens, electrospinning, melt blowing applies high-speed air flow field to attenuate the extruded polymer jet. In this study, the air flow field of a swirl die melt-blowing process was simulated by CFD software, Fluent 6.3. The swirling air profile was shown. Meanwhile, a high-speed camera was used to capture the fiber path below a single-orifice melt-blowing swirl die. The spiral motion of the fiber was revealed. The relationship between the fiber path and the air flow field was discussed. This paper shows the relationship between the fiber path and the air flow field in a swirl die melt-blowing process.

Abstract: Aiming to solve the problem of joint surface stiffiness identification,this paper presents a finite element identification method. The method based on finite element simulation and the curve fitting principles, fitting out a curve that closed to simulation results. It can identify the joint surface stifiness effectively and rapidly based on curve fitting of simulation data in sensitivity area. This method avoid the transfer function matrix difficult to test and reverse solve problem. Comparing the results of the proposed method with the substructure synthesis method, it is shown that finite element identification method is effective.

Abstract: Performance of micro-/poly-crystalline SiGe alloy solar cell of TCO/(n)a-Si:H/(i)a-Si/(p) c(pc)-SiGe/(p+)μc-Si/Al structure was analyzed via the AFORS-HET software. Cell structures can be designed to reach up to the optimal performance. Employment of back surface electric field layer of (p+)μc-Si could improve cell properties. The maximum photoelectric conversion efficiency η=21.48% occurs in a cell with average Ge percent content x0.1 and 250 m-thick Si1-xGex alloy light absorption layer, which is higher than the experimental result of the same absorption layer thickness crystalline Si HIT cell [Progress in Photovoltaics: Research and Applications, 8 (2000) 503.]. Temperature dependence of the cell performance parameters (open circuit voltage Voc, circuit current density Jsc, fill factor FF and efficiency η) indicates that Si0.9Ge0.1 cell shows weaker temperature sensitivity than that of pure Si cell. Numerical calculation illustrates that Voc decreases while Jsc, FF and η heighten with raising mean grain sizes and crystalline volume fractions, these variations with the later are more remarkable. Present optimized technique will be benefit to designing and fabricating the high performance solar cell.

Abstract: MiniQuad- II is a modular four-legged walking robot. In order to research dynamics and kinematics of the robot, based on inner relation of different simulation software, three-dimensional entity model of four-legged walking robot MiniQuad-II is built up with SOLIDWORKS software firstly. Then, the model is leaded in ADAMS software, dynamics and kinematics of the robot are simulated, the relevant process is described in this paper. As an example, the robot MiniQuad-II walking along straight line is investigated, the dynamics of the robot are analysed with ADAMS. Further, the influences on dynamics properties for the robot are discussed when structural parameters of the robot are changed. Results can be used to optimaze robot structure and determine its final characteristic parameter.

Abstract: To meet a high production requirement and high quality of nanofiber, a new disgned multihole spinneret with equilateral hexagon hole array of is used in this paper. We study the effects of two structural parameters of the multihole system on fiber diameter and fiber mats. 3D electric fields were simulated to understand the effects of electric field distribution on electrospinning performance. This study shows that fine and uniform fibers, as well as concentrated and uniform fiber mat can be obtained by this multihole electrospinning system at a high production rate.

Abstract: Parachute recovery of UAV is often caused of holes and other injuries on wings, that are required repair and maintenance. The surface of the patch will form the high stress area, that affects UAV using life and safety .But repair method is good or bad directly affects size of the high stress area. Based on finite element method, the broken hole repairing method was formulated and validated by ANSYS. The method could minimize the high stress area as far as possible, and economically repair broken hole of wing in certain precision and safety standards condition. It has a certain reference value for UAV repair and management, and has reference significance for extending the service life of the UAV. Key words: Finite element method; Unmanned Aerial Vehicle (UAV); Simulation; Hole of wings

Abstract: To control the cost and optimize the resource utilization of enterprises, production layout problem draws recently more and more attention by industries; however, a study on this problem indicates there is a lack of research on production line design, which is a major issue in the layout problem. Traditional methodology mainly depends on the designer’s experience and calls for theory analysis and quantitative study. This paper concerns the development of a multi-stage integer programming model to describe the production line layout problem, and employs a heuristic and ant-colony algorithm to solve the problem. A practical example illustrates the effectiveness of the model.