Applied Mechanics and Materials Vols. 220-223

Abstract: This paper introduced the present development and tendency of our country’s aluminium processing industry, especially the extrusion industry. As the industrial aluminum extrusion profiles accounted for the proportion of products will continue to rise, which raised for higher quality in products. All these lead extrusion equipments toward the direction of integration. It also talked about the theory and applications of on-line quenching, introduced the new progress of on-line quenching technology and equipment.

Abstract: A method of depositing and picking up cars automatically was designed by using Visual Studio 2005 software in this paper，based on FINS protocol, Ethernet communication technology, and RF card technology synthetically. An upper layer application program has been developed on the basis of charge requests, entrance states and turntable states analysis. Furthermore, the overall idea of transport process and the frame structure were devised while the specific application of OMRON PLC was researched.

Abstract: The airfoil NACA 4412 commonly employed in wind turbines is modified by attaching a Gurney flap with length of 2% chord at its trailing edge and its remodeled form as well. The SIMPLE algorithm of finite volume method and software FLUENT are respectively used to carry out numerical computation of aerodynamic performances of above-mentioned three airfoils (including the un-modified one), so that their aerodynamic characteristics, pressure distribution on their surface, and streamline around them are obtained for different angles of attack. It is shown by the computation result that the modified airfoils will result in such a strong downwash effect that the pressure distribution on airfoil surface is remarkably altered, the lift coefficient and as well as the slope of lift-drag characteristic curve are increased, and meantime the airfoil stalling is greatly postponed.

Abstract: On the basis of working characters, taking a hydraulic excavator as an example, an integrated and refined finite element model of working mechanism was established. Selected four typical working conditions, the strength analysis was made for the assembled working mechanism. According to the finite element analysis, the structure of the working mechanism was improved. The improved working mechanism met the required strength design after increasing the hydraulic system pressure.The results show that this analysis method of working mechanism can provide reference for the excavator working mechanism design.

Abstract: In order to design reasonable-structure and high-efficiency stirring device, realizing development of high sand ratio, high precision and large discharge, according to blender truck actual working conditions and mixing fluid material characteristics, this paper chooses reasonable agitator paddle structure, paddle combination type and mixing tank structure, concludes calculation methods of stirring power, paddle strength and stirring axis design, providing the theoretical support to blender truck stirring device design calculation.

Abstract: With the rapid development of microelectromechanical systems (MEMS) technology, materials such as silicon, metal, and polymers are widely used in the MEMS field. One of the reliability concerns related to Si MEMS is unwanted wear and adhesion. Therefore, SiC film is a possible choice for surfaces because of its favorable friction and wear properties such as used in cutting tool and transmission system of wind turbine. In this study, biocompatible SAM film (ODS) was used to decrease the adhesion force and the friction coefficient of SiC surface. Experimental results show that ODS can increase the contact angle and decrease the surface roughness value of SiC surfaces for the different roughness values and roughness directions. For Si, SiC film and SAMs film on surfaces, larger normal forces lead to smaller friction coefficients and cross roughness pattern have a smaller friction coefficient than that of straight roughness pattern. In addition, ODS film can decrease the friction coefficient on cross topography with relative small roughness value more effectively than can straight topography of SiC surfaces.

Abstract: To resolve the problems that it’s difficult to observe the data of real-time motion state and controls parameters, and difficult to determine the running strategy, we come up with a system design based on virtual instruments and wireless data collection. This system can not only collect the intelligent car’s running speed, steering engine angle and wheelpath, but also draw the racing track, select and optimize the running strategy. This system has been proved that it can monitor the intelligent car accurately which shortens the debugging period greatly.

Abstract: This paper is focused on the methods, which are used for planning, running and optimization of material flow. These methods are very important element of each production and company. There are several methods which are used, for example JIT (Just in Time), Kanban, TOC (Theorie of Constraints), etc. A selection of appropriate method affects largely production costs, efficiency and produced quantity. For the laboratory of flexible manufacturing systems with robotized manipulation supported by no drawing production were compared several methods and on the based their advantages, disadvantages and suitability of use was selected the most appropriate method of planning, running and optimization of material flow.

Abstract: In this paper, a positioning system based on smart space wireless sensor network platform is designed and a positioning method of RSSI-based wireless sensor network is studied. The intelligent wheelchair as a blind node in the smart space positioning system is used to collects adjacent the reference node coordinates and RSSI value. The blind node coordinates can be calculated by CC2431 location engine to achieve a wireless location. The test results show that: positioning error of the node is about 1 meter, so it has the potential to satisfy the application of the intelligent wheelchair indoor positioning.

Abstract: An innovative electronic jacquard cylinder has been developed by combining work principle of conventional jacquard cylinder and advanced electronic technology to save the cost of pattern card, and to dramatically increase production efficiency by shortening the period of preparing new patterns. The paper illustrated the design procedure of the control system and also solved the radiating problem of the electronic jacquard cylinder by analyzing the factors of heating. The feedback from clients showed that after a non-stop running of 24 hours at an ambient temperature of 35°C, the cabinet temperature has never exceeded 48°C, which satisfied the design requirements.