Abstract: As a part of sustainable product design, design for disassembly is critical for maintaining competitiveness of manufacturers. The conflicts between disassembly capability and functionality and reliability need to be addressed innovatively and effectively. This article proposes a method to combine functional analysis and substance-field(S-F) analysis adapted from TRIZ to solve such complex conflicts. First, problems of current design that hinder the disassembly capability of products are identified. Second, functional and cause analysis are carried out for the technical system to transform conceptual description into practical description for components in the technical system. Last, a solution for improving the disassembly capability of products is proposed based on the structural model obtained from S-F analysis. This method is used to improve the disassembly capability of couplings in automotive transmissions, and proven to be effective and feasible in discovering an innovative solution.
Abstract: The purpose of the paper is to investigate the dependency of various parameters on metal forming process using mathematical models. The incremental sheet metal forming process was studied using Box–Behnken design of experiments along with response from surface methodology analysis. In the study process factors namely feed rate, speed and coolant were analysed to understand the effect on the surface roughness, percentage (%) of thickness reduction, grain size and hardness of the Aluminium (Al) sheet metal, were examined after forming. The surface model analysis predicts that all four responses of the incremental forms show very strong correlation with the experimental results. The optimized process of incremental forming that runs on maintained levels of predicted factors, yield responses very close to that predicted from the model.
Abstract: The purpose of this study is to define the iterative participatory design of the development for interface content. This paper will look into the usage of visualization tool that has been adopted in the interactive context. The study will also provide the process of iterative participatory design in the development of interface content using user-centered approach to find the perception of design process in human-computer interaction context. The findings from this study will indicate that the iterative participatory design is suited as experimental method in the development of knowledge life cycle. This study has intended to show how the visualization tool will be studied using the experimental method which will be leading the iterative participatory design in the development of knowledge sharing model.
Abstract: A research has been developed for calculation models of allotypic pumping units load against a series of problems, which are ubiquitous in the oil field, such as unreasonable selection of the pumping unit type, low capacity factor of the pumping unit load, lacking of computing method of allotypic pumping unit load, etc. In the research, a calcaulation model of polished rod motion parameters has been firstly established according to the architectural feature of offset pumping units, dual horsehead pump units and tower pumping units. Then the load calculation model of allotypic pumping units were built based on the superposition method of each rod string stress. And after validating the load models in the oil field, the results have been indicated that the models have been in good agreement with the polished rod load. Therefore, the load calculation model of allotypic pumping units in this paper will be of some guidance significance to the selection of the pumping unit type and the stress check of the rod string in the oil field.
Abstract: By analyzing the modeling characteristic of ground and front-end impact areas, the modeling control strategy is proposed with regard to ventilation cover plate, engine hood, engine hood leading edge, fender and radiator grille, front bumper. The Riveting point support area concept is presented accordingly. Furthermore, the optimal position relationship of bumper modeling support area is obtained using the ADMAD under a given stiffness of bumper components. The result indicates that the optimized modeling can control the manipulation easily and helps to improve performance of driver assistance.
Abstract: Due to its large length/thickness ratio, the casing structure can be treated as plates andshells,thus the classical plates and shell theories can be applied. A general MATLAB program wasdesigned to solve the deflection problems of the isotropic casing with simple support usingdifferential method. To test its precision,two different load conditions as well as two materials wereused and their results was made comparison with that of finite element method and Navier solution.The results were in good agreement with each other and the method was efficient in solving thedeflection problems of a casing structure
Abstract: In view of the existing problems of traditional interventional catheters, particularly poor activity, operation difficulty and mass blind area, a novel interventional catheter with a cable-driven active head-end is proposed, and a prototype was built to verify the performance. This paper deals with the kinematics and dynamics of the cable-driven prototype, a dynamic model based on Kanes method combined with screw theory was presented in this paper. According the mathematical model and the prototypes structure, the analysis of kinematics and dynamics of active head-end-end is done in the environment of Mathematica. The needed driving forces of every joint when the system moving along planned trajectory are calculated. The results can provide a basis for the structure design and motion control of the interventional active catheter.
Abstract: In this study, the influence of volumetric flow rate and inclination angle of air jet is evaluated on the performance of a Saccardo ventilation system in a straight rectangular tunnel in case of fire. Simultaneous effects of volumetric flow rate and inclination angle of jet exiting the Saccardo nozzle on the behavior of smoke plume is considered by studying the structure of velocity profile before the fire source. It is found that this factor has a remarkable influence on the behavior of smoke plume and therefore, on the temperatures experienced near the fire. Besides, the influence of tunnel slope on the performance of the Saccardo system to sweep the plume is investigated. It is shown that the slope effect on the behavior of smoke plume and temperature profiles is completely different for locations before and after the fire, in both negative and positive slopes. Finally a range of volumetric flow rates and inclination angles is proposed as the optimized range of performance in an emergency fire scenario.
Abstract: In order to overcome the shortcomings of traffic signal fixed-time control method, a fuzzy control algorithm for urban traffic signal is proposed. The signal phase switching order is adjustable. The improved quantum particle swarm optimization(QPSO) is also introduced to optimize fuzzy control rules of traffic signal controller. Take four-phase traffic signal commonly used in current practice for example. Compared with traffic signal fixed-time control and single fuzzy control method, the control method put forward in this paper can reduce the vehicles’ average delay time in junction. The simulation results show that the proposed algorithm is proved to be an effective and practicable method for urban traffic self-adaptive control.
Abstract: Focus on the problems of calculation complexity and abstractness in the traditional analysis methods of serial-parallel mechanism, the complete kinematic product of exponentials formula of serial-parallel mechanism was established in the paper based on the screw representation of spatial rigid motion. The errors of 4 D-H parameters were equivalent to error screw and the practical screw coordinate containing error screw of every joint axis was established. After the practical kinematic product of exponentials formula of serial-parallel mechanism being derived, the pose error model of tool coordinate system was established. According to the above screw method, numerical calculation of cutting machine about kinematic and error analysis was performed with MATLAB and the calculation results were compared with the simulation results of ADAMS. The comparison results show that relative error of the two groups of calculation results is within the 0.001 orders of magnitude and the correctness of screw methods application in the analysis of serial-parallel mechanism.