Advanced Materials Research Vols. 998-999

Abstract: The ultimate bearing capacity of diagonally stiffened steel plates with different Span-depth ratio were analyzed by the finite element analysis software ANSYS. During the analysis, three groups of diagonally stiffened steel plates with different Span-depth ratio has been taken numerical investigations on static load, and obtained the stress distribution law of development and contrast characteristics of bearing capacity. Analysis shows components' yield and ultimate loads will be significantly improved with the decrease of Span-depth ratio. That means plates with small Span-depth ratio have better mechanical properties.

Abstract: Injection molding is a very complex multi-factor coupling effect and a nonlinear dynamic process. Therefore, under the influence of nonlinear and multi-factor, injection molding goal is to effectively predict and guarantee the quality of injection molded parts. In this paper, the common methods used to predict the quality of injection molded parts are introduced, including: Taguchi method, artificial neural network, response surface method, radial basis function method and Kriging model method. Research progresses as well as application examples of forecasting methods at home and abroad is summarized. Besides, the development trend of the injection molding quality prediction is discussed.

Abstract: A new analysis method of stress and deformation of concrete face rockfill dam is established based on ABAQUS. This new approach includes secondary development of Duncan E-B material model and secondary development of Goodman frictional model of contact between concrete face and cushion. Meanwhile, contact characteristics is considered among concrete face and between concrete face and plinth. According to dam prototype observation, the analytic results are in good agreement with calculation results from the practical engineering, which indicates that the analysis method can be used widely.

Abstract: Properties of traditional materials including steels can be improved by using the prediction and control of microstructure evolution in technological processes. Models of microstructure evolution, which take into account the technological conditions, allow to optimize the process in view of final product properties. A multiscale model of microstructure evolution have been developed and adopted for simulation of the shape rolling process. The model contains module based on finite element method (FEM) for simulation of technological processes and cellular automata (CA) module for simulation of microstructure evolution. Design and selection of grooves and simulations of rolling process in macro scale are realized by FEM. The modeling results obtained by FEM are transferred to CA and used as input data. The results of simulations of microstructure evolution can be presented as snapshots of microstructure at arbitrary time, changes of average grain size, a grain size distribution, recrystallization fraction and flow stress during the process. The results of microstructure evolution obtained by FCA for 5mm round bars rolled in diamond and oval grooves are presented in the paper.

Abstract: Based on the analysis of present situation of anchored ship shore-to-ship power supply system, the contents and focus problems of engineering construction industry standard are described. In the shore-to-ship power supply system development process the power consumption load, power supply plan and grounding techniques are analyzed and explained as well.

Abstract: Introduced the background of equipment Interactive Electronic Technical Manual (IETM), discussed the key standard common technology XML DTD/Schema, graphic interaction, etc. Form IETM common technology aspect, analyzed the main Characteristic, implementation scope, and advantage/disadvantage, and proposed the suggestion of technology selection. Analysis the different data model standard in the development process of IETM, put forward the basic principle of IETM standard selection, provided a useful reference of IETM project implementation.

Abstract: Alternative fuel vehicle industry, as one of China’s strategic emerging industries, its development process will be faced with many risks, researching the generation mechanism of risk has important theoretical and practical significance. This paper, in reference to relevant researches, put forward a kind of FIR analysis model (Factor-Interaction-Risk Model) for analysis the risk generation mechanism of China’s alternative fuel vehicle industry, the method solve the earlier risk generation mechanism studies’ drawbacks being lack of dynamic analysis, the relations among the factors hard to understand and obscure.

Abstract: To solve the low design efficiency problem of complex product, a product-level rapid modeling method is proposed. Parametric template library is created firstly. Then a hierarchical product assembly model is constructed by the top-down variable design. Lastly product model is generated automatically by using the technologies of position constraints and semantic mapping. The method has been applied to a self-developed modeling system for mesh reflector antennas (MRA). The results show that it can generate the product model rapidly, improve the design efficiency greatly, and provide the model data support for the follow-up analysis, optimization and adjustment process.

Abstract: The key to decide range accuracy in the low-cost laser triangulation-based system is the calibration of structural parameters. According to the problem that the curve fitting based on Least Square Method cannot accurately determine parameters in the case of not knowing the range of parameters, an improve algorithm is proposed for simplifying mathematical model and determining the range of the parameters.

Abstract: In the photovoltaic power generation system, the harmonic voltage of the point of common coupling (PCC) is determined by system disturbance, local load and photovoltaic power generation system itself together. Based on the fluctuations of this harmonic voltage, a new islanding detection method for the PV system is proposed. By extracting the higher harmonic components from the wavelet transformation of point of common coupling (PCC) voltage, and then taking its fluctuations as the islanding identification and detection index, non-detection zone (NDZ) can be eliminated, without a plus disturbance. According to IEEE Std.1547, simulated verification of the proposed method is accomplished in the ideal photovoltaic grid system. When the PCC voltage and frequency are within the normal range, it can not only give a fast and accurate detection to the occurrence of islanding, but also identify the false islanding, such as voltage dips and switching loads, effectively avoiding false detection caused by the false islanding.