Advanced Materials Research Vols. 156-157

Abstract: The performance of Aluminum alloy cylinder at high temperature largely depends on its inner surface hardness and wear resistance. In order to improve its surface hardness and strengthen the wear resistance, the process of coated friction of Aluminum alloy cylinder are studied by using for reference the principle which the surface coating material through friction plasticizing and the plasticized flow of the surface morphology forms a modified layer. The results show that the inner surface of the Aluminum alloy cylinder using Aluminum -Si13% alloy and Aluminum -Cu35% alloy as modified friction coating material can form more a stable horniness membrane with a thinner and more uniform coating layer and a very sleek interface and inner surface of cylinder shape after processing. Thus the wear resistance of the cylinder is improved to make engines more small-sized and light weighted.

Abstract: Bill Of Material (BOM) is the most important data for modern manufacturing enterprises. To satisfy different requirements in various departments, BOM is modeled in kinds of ways. Meanwhile, how to transfer BOM between departments become troublesome. As a ideal method, integrated BOM model is out of reach for lacking effective approach. This paper proposes a layered BOM model to integrate multi view into a whole one. Furthermore, colored digraph is applied to represent the layered model in mathematic. Also a BOM case is given to verify the method proposed.

Abstract: The advantages of CO2 Heat Pump water heater include: CO2 is one of natural refrigerants and does not affect the global environment as many other HFCs refrigerants; CO2 heat pump water heater can produce hot water up to 90 ,which is higher than HFCs heat pump water heater(about 55 ).So the application of CO2 Heat Pump water heater is potential. But the Working pressure of CO2 Heat Pump Water Heater is about 9~12Mpa and is 3-5times of HFCs heat pump water heater’. Gas cooler is one of important part for CO2 heat pump water heater, and it must meet the needs of not only pressurization but also heat transfer. So it is important to design gas cooler correctly. In the paper, one system of CO2 Trans-critical Cycle Heat Pump Water Heater is designed, and double-pipe gas cooler is designed The heat transfer characteristics of CO2 in gas cooler with water in double-pipe heat exchanger was experimentally investigated. Experimental results showed that the gas cooler can meet the need of trans-critical CO2 cycle heat pump water heater. All the work is valuable for the application of CO2 heat pump water heater.

Abstract: The basic theoretical research on sheath dress pattern with elastic fabric has put forward higher requirements. In this paper, based on dressing in dynamic change, combining with the body extend measure, the change of the pattern's control parts' specification and detail parts' specification are studied, and a basic sheath dress pattern with elastic fabric based on dynamic change is established. The human body's dynamic and static data show that the parameter of detail parts specification has great changes, while the parameter of control parts' specification parameter has small changes. For body detail parts' specification and structure, the parts that have not great changes only solve the problem of the fabric elastic utilization to meet the needs of the state of tight dress. According to the positions that produce dynamic increment, combining wearing condition, fabric elastic utilization and dynamic parameter, to design detail specification and pattern to satisfy sheath condition and dynamic demand.

Abstract: A power actuator based on a great volume expansion on hydrogenation of hydrogen storage alloys (HSAs) has been developed. The actuator has a bimorph structure consisting of Pd-Ni alloy and Cu-plating to convert the volume change into bending motion. The techniques to control the bending and rotation motions of the actuator were investigated by adjusting alloy composition, shape and the amount of hydrogen absorbed in the HSA. It is found that Pd-Ni alloy actuators exhibit a cyclic bending motion on hydrogen absorption and desorption cycles and the bending behavior can be controlled by controlling the hydrogen pressure. When a ribbon shaped actuator was deformed into the “L” shape on the transverse section, a rotation motion was observed without modifying the basic bimorph structure of the actuator.

Abstract: This paper develops an intake two-pipeline model on a 125 cc single engine including the effects of engine torque (T), fuel consumption (FC) and both CO and HC emission. Those four performances in prescribed speed range were constructed by the response surface method. The formal design of experiment has been utilized to examine the significances and characteristics of interrelated parameters. A proposed engineering design optimization simultaneously treats four performances with weighting strategy so that the optimum two-pipeline diameters, lengths, and the appropriate timing of switching low-speed pipe to high-speed pipe can be obtained. The presented integration process of experimental design optimization offers an applicable process and technique for small engine and can apply to other mechanical product development.

Abstract: A wave model in Qingdao Fushan Bay is established in the paper. The effect of the variety of terrain, dredging in the basin, the shelter of the structure, the reflection of the piers and breakwaters are taken into account. Rectangular grid is applied in the calculation. For reducing the errors and ensuring the precision, normally incident waves and completely-absorbed boundary conditions are considered in the calculation. The result gives the wave height at each point in different water levels, and wave directions of 50-years return period, which provides a basis for the shoreline structure of wave energy generation planning and designing.

Abstract: By taking 2-step rectangular braided composites as an example, the algorithm of parametric simulation of braided composites is discussed based on the analysis of yarn-moving regulation. And then, the simulation model of braided composites is created on the platform of VRML–Java, which brings the interactive design and simulation of 2-step rectangular braided composites to pass, makes the users can observe the composites spatial structure and braiding moving process intuitively and modify them dynamically on the Internet. With this method, the design quality and efficiency of products will be raised remarkably.

Abstract: The important component--- pressure device in die-cutting is analyzed by Solidworks and ANSYS Workbench. With analyzing the structure of the pressure device, some simplification is made, and the tool of draft mirror and feature mirror is often used in building the model in the Solidworks. Loads of the pressure device in different load conditions are analyzed and calculated. Stress and displacement of the pressure device are plotted after static finite element analysis. Its stress is analyzed by ANSYS. Stress and strain distribution is found. Which can provides mechanical simulation for the design of the pressure device, and provides scientific basis for selecting structure type, deciding structural parameters, increasing static and dynamic properties, reducing manufacture cost of the integral body of the pressure device.

Abstract: The lithium vanadium phosphate (Li3V2(PO4)3) cathode materials were synthesized by microwave- assisted carbothermal reduction method. The effects of microwave heating time and Li/V molar ratio on the structure and electrochemical performance of the prepared samples were investigated. The results show that the perfect crystal growth and good electrochemical performance ( first charge / discharge specific capacity of 160.8 mAh•g-1/151.3 mAh•g-1 and discharge decay rate of 7.90% after 30 cycles ) of the Li3V2(PO4)3 were obtained under the optimal conditions of heating time 11 min and Li/V molar ratio 3.05:2.0. The voltage values appeared at the oxidation and reduction peaks of the cyclic voltammetry curves were proved to be basically consistent with those appeared at the charge / discharge curves. The lithium ion diffusion coefficient was determined to be 2.320 ×10-9 cm2•s-1 by electrochemical impedance spectroscopy and mathematical models derived from simulative equivalent circuit.