Advances in Fracture and Materials Behavior

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Authors: Yi Ping Yuan, Mei Nian, Wen Lei Sun
Abstract: The Manufacturing Grid domain is characterized by rapid and substantial change over time. The entire process of product development can be quite complex. The activities are expected to be executed on heterogeneous resources which are geographically distributed. However, traditional modeling systems use static workflow models which can not automatically redesign the business process and mask the isomerism of the resources. In this article, an open and extensible framework of MG workflow is given, which complies with the standard of WFMC and GGF. A formalized definition workflow model is proposed including process model, organization model, resource model, and service mode. The integrated workflow model can be used to dynamically represent a business process and other aspect s of Manufacturing Grid workflow.
Authors: Ying Zhu, Hai Feng Huang, Yi Ping Yuan
Abstract: MG workflow can be defined as the composition of manufacturing activities which execute on heterogeneous and distributed manufacturing resources in a well-defined order to accomplish a specific goal. The execute process of MG workflow includes model building, service finding, service selecting, service binding and service invocation. Service selecting is one of the most critical components in MG workflow. So, this research brings forth AHP-based grid nodes choosing method, which takes time, quality, cost, service, fidelity, reliability, policy (TQCSFRP) as rules, and chooses best resource node as target. The dynamic service binding and invocation between an activity request and an optimal service provider is realized when a workflow is in execution. Higher flexibility and self-adaptability of workflow management are achieved. Furthermore, the application architecture is depicted at the end of the paper to illustrate the utilization of MG workflow.
Authors: Zong Feng Zou, Tao Yu
Abstract: By Data Grid to handle data sharing problems of distributed position in Group Purchasing. And so, evaluating and mining massive amounts of data is without fail required replication is important techniques to provide fast data access. Several replication modeling algorithms are studied in the paper. OptorSim provides a modular framework under different Grid environment. OptorSim is used to achieve the Grid simulator to research the stability and transient action. Modern group-companies are often made of many subsidiary companies. Stocking centralization can economize much fund for its large-scale purchasing action. Subordinate companies hope to choose the best provider according to reliable data in most possible area. Advanced data in variety units is massive amounts of data that must be post-processed and organized to support provider evaluation actions. Increasing data volumes from all of the companies challenge to state-of-the-art database system and data-loading techniques. Grid concept is adopted to solve the problem in the project which is named Price Comparison System (PCS). One of the key technologies in the system is to improve the data access.
Authors: Hyun Wook Nam
Abstract: This research studied robust design of composite hand for LTR (LCD glass Transfer Robot). 1st DOE (Design of Experiment) was conducted to find out vital few Xs. 108 experiments were performed and their results were statistically analyzed. Pareto chart analysis shows that the geometric parameters (height and width of composite beam) are more important than material parameters (E1, E2) or stacking sequence angle. Also, the stacking sequence of mid-layer is more important than that of outer-layer. The main effect plots show that the maximum deflection of LTR hand is minimized with increasing height, width of beam and layer thickness. 2nd DOE was conducted to obtain RSM (Response Surface Method) equation. 25 experiments were conducted. The CCD (Central Composite Design) technique with four factors was used. The coefficient of determination (R2) for the calculated RSM equation was 0.989. Optimum design was conducted using the RSM equation. Multi-island genetic algorithm was used to optimize. Optimum values for beam height, beam width, layer thickness and beam length were 24.9mm, 186.6mm, 0.15mm and 2402.4mm, respectively. An approximate value of 0.77mm in deflection was expected to be maximized under the optimum conditions. Six sigma robust design was conducted to find out guideline for control range of design parameter. To acquire six sigma level reliability, the standard deviation of design parameter should be controlled within 2% of average design value
Authors: Wen Xian Tang, Shou Jun Xia, Jun Xiang Jiang
Abstract: To realize product self-organized evolution innovation that is driven by knowledge, the method of ontological expression of product innovative knowledge and integrated reasoning technique are researched. Ontological knowledge system that drives product self-organized evolution innovation and its expression model were built. The expression manner of ontological knowledge based on STEP was discussed, and it was implemented by instantiation of ontological knowledge. The knowledge-based reasoning technique was adopted to transform dada to driven rules, so as to bring innovative product scheme; the case-based reasoning was used to match corresponding structure scheme. The knowledge base and rule base for circuit breaker development were set up, and self-organized evolution innovation of its mechanism system was accomplished. Applied example shows that ontological expression method of the knowledge and integrated reasoning technique with maneuverability and practical value can satisfy requirements of self-organized evolution innovation that is driven by knowledge.
Authors: Zhi Chun Yang, Jiang Hua Liu, Bin Li, Le Wang, Bao Sheng Dong
Abstract: The analytical evaluation and finite element methods are used to analyze the critical stability of the shallow spherical roof of oil storage tank with an axial symmetrical corrosion region. At first, the nonlinear finite element method is adopted to calculate the global critical load of the storage tank roof, and the local corrosion region is equivalent to a circular corrosion pit with uniform depth. The results show that the tank wall and inner pressure of the stored oil have slight effects on the stability of the roof. To build the formula of local critical load of the tank roof, the circular corrosion pit is separated from the whole roof and treated as a shallow spherical shell which is elastically supported on the rest part of the roof. The equivalent support stiffness is obtained by the deformation compatibility at the edge of the corrosion pit. The resulted nonlinear stability equation is solved with a modified iteration method to determine the local critical load. The local critical load for an in-service corroded oil tank roof is analyzed by the proposed approach and the results are compared with those calculated by the conventional nonlinear finite element method with good agreement and the geometrical parameter of the corrosion region corresponding to the minimal critical load is 9.5.
Authors: Soo Ho Pyo, Young Ho Suh, Sun Woong Choi, Yeong Sung Suh
Abstract: Structural feasibility study on a Slidable One-Touch Extension (SOTE) fitting for profilewalled drainage and sewer pipes was performed. SOTE fitting was developed for the purpose of accommodating large thermal deformation that could occur during installation, which if not treated properly in design can cause problems such as loosening of the pipe and in some cases cracking of the support constraint. SOTE fitting assembly process was examined via virtual assembly to determine the structural soundness and thermal deformation behavior was investigated for its design efficiency and performance. For both analyses the finite-element method was utilized and corresponding experiments were also performed to support the findings. Finally, cyclic fatigue tests were carried out on fittings followed by the leak proof test to determine integrity of the SOTE fittings. Through analysis and experiments SOTE fitting was shown to perform its designed functions with required structural stability.
Authors: Jian Jin, Ting Yu Zhang, Guo Xian Zhang
Abstract: According to the requirements of the power department, a new type of inspection robot that works along ground wires is developed in this paper. The robot can navigate counterweights, clamps and particular the towers autonomously. The locomotion principle of tower-navigation is presented. In order to decrease the mass eccentricity of the robot, a centroid balance method is proposed. Virtual prototyping technical is used to validate the centroid balance method. It proved that the proper movement of the electric box can adjust the robot centroid distribution efficiently. Driven torque and the power cost of the whole system both decrease a lot. And the robot works more safely.
Authors: Hiroshi Kawai, Akira Kuwata, Hirohisa Noguchi
Abstract: An e-learning system for computer-aided engineering is developed. The system is designed as a Web-based rich client (or rich Internet application, RIA), so that anybody can learn CAE skills from anywhere, anytime. Mesh generation, finite element analysis and visualization capabilities for a set of benchmark problems, such as cantilever beam and plate with hole, are implemented using FLASH ActionScript language. It is combined with a CAE educational program, dedicated for under-graduate students and novice engineers in mechanical and architectural industries.
Authors: Yoshitaka Wada
Abstract: There are several studies for developing web-based CAE applications to substitute existing CAE applications. CASOW is the web-based CAE system developed by the author. The approach for implementation of the system is to use fundamental technologies, for instance, HTML, HTTP, CSS and so on, because we cannot know whether new technologies will be alive or not. Certain technologies bring specific advantages to the applications, but a life time of the application would be short. Recently a great advantage of web interface is developed. Such a representative application is Google Maps which doesn’t require any special software components; however the application realizes interactiveness of the application. The technology is called Ajax which drastically overcomes the bad interactiveness on the web browser. On the other hand, high efficiency of analysis work with high performance computers produces many kinds of knowledge and a large amount of information. We are confronted with inefficient knowledge and information management in the network system. This paper presents the new web-based CAE system using Ajax and knowledge sharing framework with compatibility to web interface. The system is presented, and advantages of the interface, effectiveness of the API in the system and knowledge sharing framework are discussed.

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