Advanced Materials Research Vols. 201-203

Abstract: In order to develop the process-oriented software, we put forward hierarchical colored Petri net (HCPN) to model business process. This approach consists of hierarchical decomposition graph, detailed process graph. Furthermore, the concept of business process components (BPCs) is proposed to facility the business process modeling. The software components, which are constructs of the information system, can be derived by means of the mapping from the relevant business process components. The development of business process-oriented application will be more convenient and rapid based on component library. Such an application becomes more flexible to the changing environment.

Abstract: The components of sheet metal FMS are abstracted corresponding eM-Plant object, the sheet metal FMS’s automatic guided vehicle system and parts management system are built in eM-Plant. Adjusting the system parameters in the model, several simulations obtained an ideal simulation result. These research show that, using eM-Plant software to build model and simulate for sheet metal FMS can save time, improve simulation result of sheet metal FMS.

Abstract: Considering the influence of distributor participation, collaborative knowledge innovation is studied by building the game model from the decision-making viewpoint of manufacturer. Changes of market demand due to the collaborative innovation and the behaviors of participators are also analyzed. The results show that distributor participation can spur manufacturer to increase product innovation investment and be available to realize the higher level of innovation, and that the degree of distributor participation is not only affected by its own cost of the collaborative innovation, but also the investment of manufacturer. Furthermore, the research gets the boundary condition of different decision selection for manufacturer and its distributor.

Abstract: In the multi-disciplinary design process of complex product, it is hard for designers to obtain designing knowledge timely and accurately which causes the low efficiency of product design. With consideration of the above problem, knowledge navigation method is proposed based on context navigation model (CNM) and knowledge model (KM). CNM describes the matching relationship between designing activity context (AC) and knowledge context (KC), and composes of AC, KC and knowledge context network (KCN). KM describes designing knowledge element (KE), and the matching relationship between KC and KE. Based on these models, procedure of multi-disciplinary knowledge navigation is introduced. Taking the design process of industrial steam turbine rotor flow division section as an instance, the result shows that this procedure, based on CNM and KM, is able to supply designers with proper product knowledge timely and promote the designing efficiency of complex product.

Abstract: This paper adopts the method of PRO/E programs, relationships and parameters to conduct the parametric design process for various types of spur gears, analyzes the key parameters of the spur gears, defines them via programming, and by the use of parameters dialog box and relationships dialog box to define basic parameters and the relationships between them step by step, finally to complete the gear’s parametric model.

Abstract: Aiming at Job Shop Scheduling Problem with Minimal Makespan, This paper is designed to use genetic algorithm to solve the problem of job shop scheduling, and also achieves the algorithm by using the C#. Application shows that the genetic algorithm to solve job shop scheduling problem is efficient and has good application value.

Abstract: To improve efficiency of NC tool path generation for triangular Bézier surface and solve the interference issues of tool path, we proposed an algorithm of generating interference-free NC tool path based on triangular Bézier surface. The R*S tree is introduced into the algorithm and the dynamic spatial index structure of the triangular Bézier surface model is established by R*S tree; the intersection regions are acquired rapidly based on the R*S tree, so that the intersection triangular Bézier patches are located exactly; each intersection triangular Bézier patch is adaptively subdivided into many triangular planar patches in the scope of the tool path precision; the intersection curves are acquired through the intersection of triangular planar patches and cutting planes; the points on intersection curves are taken as the driving points, thus the interference-free cutter location points of triangular Bézier surface are obtained by the iterative calculation method, and then the interference-free cutter location points are connected rightly to generate NC tool path. It has been proved by examples that the algorithm of generating NC tool path based on triangular Bézier surface has strong adaptation to data type and that it can accurately and efficiently obtain the interference-free NC tool-path for the intricate triangular Bézier surface.

Abstract: Take VD furnace’s shell as research object, using ANSYS FEM study its stability character. The furnace body and cover’s 3D and FE model were established separately. Model’s eigenvalue buckling were analyzed at 20°C and 200°C , on the basis of this, considering structure’s initial disfigurement and material’s nonlinearity, furnace body and cover’s double non-Linear Buckling Load under external pressure were calculated. The result shows that furnace body’s double non-Linear Buckling Load are 1.44 MPa and 0.96 MPa at the normal temperature and 200°C separately, and its appeared 7 wave-number’s lateral instability; The furnace cover’s double Non-Linear Buckling Load are 2.07MPa and 1.23 MPa at the normal temperature and 200°C separately, maximum displacement on the roof and near vacuum duct position. The furnace body and cover’s stability under 20°C and 200°C satisfied design requirements. The calculate results provide the theory basis for VD vacuum furnace’s physical design.

Abstract: The paper developed straw crusher intelligent design software based on UG software and Visual C++ software. Firstly, the frame structure and function modules of the system are discussed in detail. Secondly, the key technologies and design process of straw crusher intelligent CAD design system ware discussed; Lastly, The system has carried on the confirmation through the concrete example, straw w crusher parts has been carried on reconfiguration. Compared with traditional design, the method upgrades the designing ability and efficiency of the enterprise.

Abstract: Reverse engineering has been widely recognized as a central step in a product cycle of designing and manufacturing. However, major problems with current reverse engineering technology are the inefficient surface reconstruction process, lack of digitizing accuracy control in the data digitization process, and bottlenecks resulted from huge amounts of digitized surface points in the surface modeling process. Moreover, under this limitation, modern concurrent engineering concepts are difficult to be applied to obtain optimal product process. This paper presents a case study on the reverse designing of a plastic part. The study applies a developed reverse engineering approach to reconstruct surface--a series of advanced algorithms, including segmentation, simplification, extraction, fitting curves and reconstruction surface. Two orthogonal curves, which are fitted from the digitized points, are taken as base curves of a ruled surface patch. All surface patches are merged into a whole surface by trimming and chamfering. A CAD model is constructed based on the whole surface. The approach integrates surface digitizing and modeling processes of a plastic part into surface reconstruction process. Using the approach, accurate product CAD model can be efficiently generated and the product design cycle of plastic parts can be successfully linked.