e-Engineering & Digital Enterprise Technology

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Authors: Y. Zhao, Rong Mo
Abstract: The traditional series working mode can not make the outcome of product design process verified by activities of manufacturing domain in time, and the manufacturing process can not be executed concurrently. The purpose of this paper is to develop a method to solve the problem mentioned above. The connotation of the collaboration between design and manufacturing is studied firstly, and then the design state maturity model (DSMM) is proposed in this paper. Six levels of maturity are defined in this model, and every level can support the collaboration between design and manufacturing in different degree. Based on the design information required in the manufacturing process, the information included in each level is studied and particularized. Finally, the DSMM-based work process of collaboration between design and manufacturing is studied.
Authors: Yi Nan Lai, G. Y. Zhang, H.N. Yu, Gang Feng Liu
Abstract: The numerical simulation method is used to solve the problems of pipe bending manufacturing such as die with fine cracks, ovality of pipe. The fan-shaped die is welded with steel plate in circle and rib in radial direction by the analysis of structural deformation. The optimal design is provided with ovality of pipe as object variable and sliding slot dimensions as design variables. Compared with experiential shape groove of slot, ovality of optimized slot decreases about 10.5% in average. It greatly reduced the production cost using computer simulation method to replace a lot of experiment improving tube-bending production.
Authors: W. Li, J.S. Yao, R.H. Li
Abstract: During the operation of trolley crane systems, the anti-sway control of the suspended load is always a key problem .Due to the uncertain properties of the trolley crane model, it is difficult for the conventional PID controller to tune its parameters online, so it can not reduce the swing effectively. In this paper, we design a control system based on single neuron controllers which using single neuron controllers to control the swing motion. The computer simulation results show that the single neuron controller has better adaptability and robustness than PID controller in term of different rope length and load.
Authors: H.B. Zhang, L. Zhou, Ying Xue Yao, Dong Li Qin
Abstract: Because of many advantages that other kinds of bearings can not match, for example high precision and high speed, gas lubricated bearing has been used widely in areas such as ultra-precision machine tool and inertia apparatus. The paper introduced an orifice restrictor externally pressurized spherical gas bearing, which is easily shaped and has bigger stiffness in both axial and radial directions. The paper also introduced a bearing force calculation model based on finite partition of the bearing, in which the influence of the uniform pressure slot also considered.
Authors: F.S. Qiu, W.J. Liu, Y.H. Chen, D.F. Zhao
Abstract: For process assignment that is strongly cohesive and weakly coupled, an evaluating model based on activity relation matrix is constructed on the similarities between software programs and the process. In this model, activity relationship matrix is employed to describe constraint-dependent relationships among activities, and this matrix is presented for calculating the numbers of controlling elements to improve the efficiency and rate of getting cohesion coefficients. In additional, the inspiration for the introduced notion is derived from cohesion metrics in software engineering. Also, a heuristic qualitative analysis method is provided that is based on this model to decide between various process assignment alternatives. Both a theoretical and an empirical evaluating method give a positive support its soundness. Lastly, several examples are given to verify the feasibility and effectiveness of the model.
Authors: J.M. Wen, Z.C. Cao
Abstract: An analytical technique, namely the method of multiple scales, is applied to solve the differential equations of free oscillations with even nonlinearities in a mass-spring system. Unlike other perturbation methods, the method of multiple scales is effective in determining the transient response as well as determining the approximation to the frequency of the nonlinear system. In this paper, the periodic solutions of the even nonlinear differential equations have been obtained by using the method of multiple scales. Compared with the numerical examples, the approximate solutions are in good agreement with exact solutions. The numerical and analytical solutions have clearly shown that there exists the so-called drift phenomenon in the free oscillations of systems with even nonlinearities without any external excitation.
Authors: H.B. Miao
Abstract: Conceptual design for the mechanical products is the most important and complex phase. Most of the human’s creativity is exhibited in this phase. So many researchers in the world have made researches on its theory and methodology. So far there exists an evident limitation for the modern conceptual design methodology. That is to say, the design scheme obtained form conceptual design is only one solution to the given design problem, which cannot guarantee the creativity and novelty of the design scheme. In order to improve the creativity of conceptual design, the re-creation process model for the intelligent conceptual design is presented in this paper based on function-behavior-structure model. This model expanded the problem’s solution space by degrading the space of behavior and granularity, and describing the behavior space using the more basic behavior. The key of re-creation process model is the transformation of behavior and granularity space. Taking the theory of quotient space as the math description tool, the transformation for the space of behavior and granularity is studied in detail in this paper. At last, an example is given to prove that it is easy to obtain the novel and creative design scheme applying the method presented in this paper.
Authors: Alan J. Crispin, Kai Cheng
Abstract: This paper presents a greedy search placement algorithm which incorporates backtracking for the leather stock cutting problem. In the leather manufacturing industry the efficient cutting of component parts (stencils) form a hide is of prime importance to maintain profitability. Consequently, the development of new approaches for generating cut-plans that minimise material waste and which can handle problem constraints have practical value. The unique feature of the greedy placement algorithm method presented in this paper is that it incorporates backtracking which allows previous placement steps to be retraced in situations where no placement solution can be found. The underlying encoding method is based on the use of the no-fit polygon (NFP) which describes the boundary around a stencil shape such that a second stencil shape can be placed while just touching the first but without overlapping. A material coverage of 64% can be achieved when taking placement constraints into account.
Authors: Hui Bin Sun, Ping Yu Jiang, B. Yu, M. Zheng
Abstract: To enable drawing viewing in the mobile manufacturing collaboration environment, an SVG-based solution is proposed. It converts the CAD files into SVG (Scalable Vector Graphics) files for PCs, PDAs(Personal Digital Assistants) and smart phones. Assisted by corresponding SVG viewer, different terminals can view the same file at the same time. On the basis of operation decoding and encoding, collaborative interaction and awareness can be supported. The solution implements drawing viewing across heterogeneous terminals. And it can benefit the mobile design or manufacturing collaboration a lot in certain case.
Authors: Ai Min Gong, Ping Yu Jiang
Abstract: Currently, Internet/Intranet-based enterprise knowledge management for product life-cycle plays a very important role. For modern enterprises, knowledge management is applied to enhance the core power of competition and development. The internet/intranet-based enterprise knowledge management will be helpful to all the stages of the whole product life-cycle, including the excavation of knowledge, verification flow, knowledge sharing and innovation, coding management technology, knowledge attribute view and application knowledge-unit technology etc. This paper mainly discusses how to implement overall structure of networked knowledge management, construction, key technology specification and practical application of enterprises.

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