e-Engineering & Digital Enterprise Technology

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Authors: Xiao Dai, Yi Qin, Neal P. Juster
Abstract: A web-based collaborative design advisory system for designing micro products is being developed, which is based on use of both knowledge and rules. The system is aimed at helping designers to assess/optimise the design of micro products to be manufactured with micro-forming. The Microsoft C# programming language, ASP.Net technique and Microsoft Access database system have been used to develop this system. The system is composed of various assessment modules such as product geometry features, forming processes, materials, machines, tools and cost assessment modules. Clients can use/browse the user interface of the integrated system through the internet to import a CAD design model and define design parameters. The system is not only able to assess the client’s design but also to generate preliminary process plans for the selected micro-forming processes. A micro-pin design is used as an example to test the capability of the 1st prototype system. With such a system, some advantages such as increasing the design efficiency in the web-based collaborative design environment have been identified.
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Authors: Neng Jian Wang, Qin Hui Liu, Z. He
Abstract: Aiming at the characteristics of the product design team under internet environment, the intelligent resource selecting method through price is put forward. Based on this, the evaluation model of the product design team under internet environment is established, and meanwhile, the practical case is introduced to provide an effective method for the optimization of the intelligent resources.
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Authors: G.Q. Wang, G. Wang, Min Lv
Abstract: Most of workflow management systems in the market are based on centralized defining in the organization. Further more, they have poor ability to describe the complex process, and have difficulty to deal with the business process share between cross-organizations. To support virtual and cross-organizational workflows in distributed environment, WfMSs must realize cross-organizational and distributed management to improve the dependability and extensible etc. To solve these issues, a Web-based lightweight process modeling system has been developed in this paper. This system is based on Java and XML technology, and provides friendly GUI which is easy to be used. The model document can be saved in XML format, so the interoperation between different workflow products becomes easy. This system establishes the base for enacting the WfMSs.
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Authors: Xiao Hong Suo, Zhan Qiang Liu
Abstract: Facility layout plays an important role in the performance of manufacturing systems. Firstly, this paper describes the derivations and classification of facility layout problem (FLP). The concepts of static facility layout problem (SFLP), dynamic facility layout problem (DFLP) and robust layout problem are introduced, and their main performance characteristics are compared with each other. Then, the procedure of rearrangement costs in DFLP is proposed. Some main characteristics of SFLP and DFLP, DFLP and robust layout are compared respectively. Lastly, the difference and connection among SFLP, DFLP and robust layout are analyzed. The research results indicate that the dynamic facility layout and robust layout are suitable for the dynamic and changeable manufacturing systems. The method for development of DFLP and its implementation are presented based on SFLP and robust layout.
235
Authors: Shao Bo Li, Xi Chen
Abstract: HFC (Hierarchical Fair Competition) model is a kind of sustainable EA based on hierarchical search. On the basis of studying the sustainable evolutionary theory of HFC model deeply, in the HFC model the admission and export threshold are proposed to divide all fitness grade. And it is suggested that both static and active thresholds is used by the complication of different problems. In addition, through analyzing the parameters and topology space of HFC model, it is gained to the organize framework and detailed algorithm structure. Finally, it is proved by exercise that HFC model can maintain the diversity of population and assure the fair competition during individuals effectively.
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Authors: Zheng Liu, Ping Yu Jiang, S.Y. Zhou
Abstract: Based on feature modeling technology, a method of manufacturing process flow reasoning of micro device is presented to support the top-down design flow. The knowledge of micro device is hierarchically organized to construct the ontology-based knowledge database that is combined with the expert system by an interface. With the support of process databases, the manufacturing process flow is derived by process reasoning.
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Authors: J. Liu, L.J. Xu, Z.H. Lin
Abstract: Root-cause identification and product quality characteristic modeling are key issues for improving product quality and the productivity of manufacturing process. The quality characteristic model, which indicates the influence of the dominate root-causes on the product quality characteristic, is the basis for quality control. In this paper an approach for quality characteristic modeling based on Support Vector Machine is presented. The selections of parameters and the Kernel function are discussed. The presented approach is applied for analyzing and predicting the quality of inertial gyroscope.
253
Authors: Y. Lu, Ying Xue Yao, R.H. Hong
Abstract: Motorized spindle is one of the core parts of high-speed machine tool, to a great extent, its thermal characteristics determine the thermal stress and thermal deformations, therefore the research on thermal characteristics is of great significance to increase the accuracy of high-speed machine tool. In this paper, the heat generation developed in the built-in motor and the bearings is calculated. The motorized spindle is modeled and its thermal characteristics analysis by finite element method is done using ANSYS software, in the foundation of analyzing its configuration and heat transfer. The variation regularity of its temperature-rise and temperature field is also summarized. Thereby it provides a powerful theoretical basis for reducing temperature–rise, calculating thermal deformations and improving working conditions.
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Authors: Hong Wen Ma, L.Q. Wang, D.L. Chen, X.W. Hao, H.W. Luo
Abstract: A crab-like octopod robot is introduced in this paper. The body structure of the robot is simuliar with a real crab. Each leg has three jionts which are driven by servomotors. The control system is a distributed hierarchical system with a top layer as gait generator and a bottom layer as servomotor controller. The bottom layer has enght individual control units every of which can control three servomotors using PID control method. The sensor systerm is composed of force sensors mounted at the end of the leg and a inclinometer provides pitch and roll angles of the body.
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Authors: Peng Jia, Qing Xin Meng, Hua Wang, Hai Bo Wang
Abstract: The fingertip force sensor is the key for the complex task of the dexterous underwater hand, in order to safely grasp an unknown object using the dexterous underwater hand and accurately perceive its position in the fingers, a sensor should be developed, which can detect the force and position simultaneously. Furthermore, this sensor should be used underwater. It is difficult to employ the accustomed calibration method for the characteristic of the fingertip force sensor, and the accustomed method is not able to assure the precision. A calibration method based on RBF (Radial-Basis Function) neural network is introduced. Furthermore, the calibration system and program are also designed. The calibration experiment of the sensor is carried out. The results show the nonlinear calibration method based on RBF neural network assure the precision of the sensor, which meets the demand of research on the underwater dexterous hand.
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