Abstract: In recent one century more than 60 design methods of products have been proposed and most of them can satisfy the one or several requirements of the general qualities only. So it is necessary to develop some synthesized design method, which can satisfy requirements of general synthesized qualities of product. Up to now, several scientists and technologists have done their efforts to study several synthesized design methods in order to satisfy more requirements of users. These methods are comprehensive design method, QFD method, taguchi design method, axiomatic design method, etc. Based on the classification of the design methods, we have proposed a new synthesized design method, named 1+3+X. The present method meet the need of customers for different general synthesized qualities of product including main and supplementary functions, structural performances, working performances and manufacturing performances and the first 1 is functional optimum design, the 3 are the dynamic optimum design, intelligent design and visual design to satisfy structural performances, working performances and manufacturing performances respectively, and the X is the design to satisfy other requirements.
Abstract: The residual stresses of WC coating prepared by flame spraying and laser re-melting were measured quantitatively with X-ray diffraction (XRD) stress tester, and its micro-structures were observed with SEM, and the effects of residual stress on bonding strength of coating interface were analyzed. The experimental results are shown that residual stresses of WC coating are all tensile, and the effects of coating thickness on its residual stress is obvious, and residual stress is verse ratio with its thickness; Coating stress influences its cracking, tensile stress speeds its cracking, which causes its bonding strength decrease; The stress state is improved by decreasing its thickness, and its bonding strength can be increased.
Abstract: The dynamics of customer requirements in the global domain are dictating a need for the reconfiguration of existing conventional manufacturing systems in order to adapt and respond to the changing functional requirements. This study presents the investigation of the feasibility of adapting a hydraulic cam system to a power press for uphill sheetmetal piercing. The surface topography of sheared edges of blanks and slugs was analyzed using Zygo New View 200 Scanning White Light Interferometer. The piercing force in each trial was monitored and analyzed via computer-press interface data acquisition system (DAS). The average piercing force, 10721N, obtained was found to be nearly constant throughout the experimental trials.
Abstract: To improve product family design methods for mass customization currently, scale-based modular method for product family design is proposed. On the basis of it, a web-based customization product design system is built. Three processes are included in the system: modeling product family, customizing individual product and estimating cost. Key technologies used in the system are studied on focus that include modular design, scale factors design, tabular layouts of article characteristics (LAC), Case-Based Reasoning (CBR), parametric CAD (SolidWorks) and so on. Finally, taking MK2110 internal grinder as an example, the web-based customization design system is set up.
Abstract: The laying pipe manipulator is used to lay concrete pipe, and it solves the question of safety, quality, and efficiency in the pipe laying construction site, and the critical question of locating system is studied. The work principle and mathematical model of locating system were established, and the experiment of locating system was done. According to the test result, the work principle and mathematical model of locating system had turned out to be well adapted for requirement. The locating system of laying pipe manipulator can be applied to product development. The mathematical model of locating system supplies the basic control theory for the manipulator to lay and joint concrete pipe automatically.
Abstract: Dynamic characteristic was analyzed for the hydraulic anti-sway system,and established the mathematical model of crane system by using Lagrange equation. For crane load swing problems, established the Parametric oscillation model of crane, through coordinate transformation, transformed the differential equation of crane into the standard form of Hill equation, and with research on Hill equation we can get the condition about damped oscillation. With the introduction of the parameter plane, the stable map of Hill equation can be drawed, i.e. the map of load damped oscillation. We used MATLAB-Simulink to simulate. The vertical motion of hoist has obvious influence on load sway. Through controlling cable length lifting motor has some good help to lowering sway angl of crane load.
Abstract: With multiple unit running speed, the carbody structure design, strength and fatigue reliability have become an important part of the multiple unit design. From the design requirements of carbody, based on digital prototype technology, the architecture and the development process of carbody integrated design and simulation platform are put forward. Combined with the process of body design, which includes scheme design, three-dimensional structure design, calculation and verification of strength, fatigue reliability analysis and fatigue life prediction, the main module, the key technologies and methods of the body design and dynamic simulation system are discussed. It has important engineering significance for improving the efficiency of the body design and promoting the carbody design.
Abstract: A there-dimensional finite element model of the working device of a single backhoe-bucket hydraulic excavator was developed to analyze and evaluate the rationality of structure design of the working device in this study. By finite element modal analysis, the resonant frequencies and vibration modes of the working device system were obtained. By dynamic response analysis, the changing trends of stress and strain of the device were obtained. In addition, the influence of different excavating resistance forces to the working device on dynamic response of the device system was compared for large and small resistance forces at the beginning excavation moment. The results show that a large resistance force at the initial excavating moment may result in the device vibrating with large vibration amplitude at the beginning excavation moment. These results might provide useful reference on design improvement of the excavator working device.