Papers by Keyword: Modeling

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Authors: Gui Yang Yao, Wei Ping Hu, Huan Huan Tian
Abstract: Compared with the column style of Chinese traditional and Western classical from chapiter, trunk, column base in detail. Analysis of the column of the Eastern and Western Art Deco and shape differences. By comparing ,absorb the essence of both for the theoretical and practical of modern style column type decoration.
Authors: Kun Lv, Qing Liang Zeng
Abstract: Product development is a concurrent process, which tends to be of such features as collaborative, distributed (web-based), interactive, and knowledge-intensive. Because the participants to work on a project come from different backgrounds, they will difficult to interact and understand one another. Ontology is a common language to model domain knowledge and makes the communication between people and the interoperability between systems easier. In this paper a CPD-ontology is built in IDEF5 to capture the knowledge about collaborative product development (CPD), then to serve as a foundation of knowledge management in the process of CPD.
Authors: Xiao Ling Yin, Bo Yang, Hai Tao Li
Abstract: To take a wonderful understanding of design process, a modeling method based on colored hierarchical timed Petri nets and a model for a typical process of product design using this method are introduced. Then, aiming at some key issues, the model are simulated by CPN Tools and the results are shown in the paper according to which some convictive conclusions are drawn which indicates the method introduced is valid and reasonable.
Authors: Hans Eckart Exner, Günter Petzow
Abstract: Understanding porosity coarsening is essential for controlling the properties of sintered materials and for producing high density or near net shape parts. As porosity is interconnected up to relative densities in excess of 80% or even 95%, measuring, monitoring and modelling of the growth of individual pores is relevant only at very high relative densities. This paper tries to convey two essentials of porosity coarsening: (i) characterization of the geometry of the pore space in the lower range of densities is possible by using stereological parameters, and (ii) coarsening of porosity takes place during all sintering stages by various mechanisms. Porosity coarsening has been reported in metals, ceramics and glasses. Recent and classical approaches, experimental results with two dimensional model arrangements as well as computer simulations of formation and opening of particle contacts are discussed. The effect of porosity dimensions on the properties of sintered materials and measures for preventing and provoking porosity coarsening are briefly addressed.
Authors: Jesús Toribio, Viktor Kharin
Abstract: The present paper offers a continuum modelling of trap-affected hydrogen diffusion in metals and alloys, accounting for different physical variables of both macroscopic nature (i.e., related to continuum mechanics, e.g., stress and strain) and microscopic characteristics (material microstructure, traps, etc.). To this end, the model of hydrogen diffusion assisted by the gradients of both hydrostatic stress and cumulative plastic strain, stress-and-strain assisted hydrogen diffusion, proposed and frequently used by the authors of the present paper (Toribio & Kharin) is analysed in addition to other well-known models such as those proposed by (i) McNabb & Foster, (ii) Oriani, (iii) Leblond & Dubois, (iv) Sofronis & McMeeking, (v) Krom and Bakker, showing their physical and mathematical differences and similarities to account for different physical variables.
Authors: Yan Wang, Long Han, Meng Ling Wu, Zhuo Jun Luo
Abstract: A hardware-in-the-loop (HIL) simulation test bench for subway train brake systems is built in this paper to avoid the high costs of brake system field tests and maintain the reliability of test results. The HIL simulation test bench consists of a simulation part a hardware part. The simulation part includes a train model and a GUI. The hardware part mainly consists of six pneumatic brakes and a driver controller, which is used to generate brake commands. Signal transmissions between the simulation and hardware parts are realized using DAQ and signal transformation boards, as well as an MVB network. Test results suggest that the HIL test bench proposed is able to reproduce the braking behaviours of a train rather well, thus it can be used to carry out train braking tests in place of the costly field tests in some occasions.
Authors: Raffael Joliet, Michael Kansteiner
Abstract: The demand for highly resistant surfaces is driven by the requirement for resource efficiency and rising environmental concerns. Finishing processes like long-stroke honing for the machining of boreholes of chuck components make it possible to create surfaces with favourable tribological properties. Since variations of process parameter values have complex effects on the resulting workpiece topography and its characteristic values, many experiments might be necessary to achieve certain properties. To avoid this, a simulation-based approach has been developed that relies on a high resolution model of the tool and the workpiece. For its calibration and validation, systematic investigations of a honing process and the machining parameter values have been conducted, and the measured surfaces are compared to the computed workpiece topographies.
Authors: M. Simpson, I.A. Gorlach
Abstract: This research reports on error identification and compensation of a special purpose CNC machine. The kinematic model of the machine was developed using rigid body kinematics and small angle approximation of the axes of the machine through homogenous transform matrices, and the equations describing the volumetric errors. The machine was calibrated to measure the axes errors, which were used in the kinematic model in order to determine compensation values. The model was evaluated by means of direct measurements of axis movements using a laser interferometer, as well as in cutting tests, where a large number of holes were drilled in plates and measured with a CMM. The results showed that the developed model achieved an average error reduction of 40%, for the X and Y axes.
Authors: Ying Ling Bao, Li Chen, Hong Lin Wang, Zong Cheng Yan
Abstract: A suitable starch hydrolysis strategy is crucial for conversion of starch into fermentable sugar, both with regard to reducing hydrolysis cost and increasing hydrolysis efficiency. A mathematical model for starch hydrolysis has been developed to predict sugar released curves based on experimental data from starch cold enzyme hydrolysis. At the first part of cold enzyme hydrolysis, starch was hydrolyzed by α-amylase (EC and conversion into dextrin and glucose. Secondly, the residual starch and dextrin were second hydrolysis by glucoamylase (EC into glucose. Fitting of experimental data was made by non-linear regression. Parameters values calculate were obtain from previous studies or experiments. Though mathematic formulation, the kinetic model was able to fit experiment with very good agreement. This model can be used for simulation of the industrial process and for faults detection. It can also be utilized for the optimization and even for the supervised control of the process.
Authors: Jin Peng Qi, Ying Zhu, Yong Sheng Ding
Abstract: Generally, a cell can trigger its self-defense mechanism in response to genomic stress under acute perturbations from outer environment. To investigate the dynamic kinetics of cellular repair mechanisms in fighting against genomic stress, a mathematical model of representing and analyzing DNA damage generation and repair process is proposed under acute Ion Radiation (IR) by using the Kinetic Theory of Active Particles (KTAP). In this paper, we focus on describing a mathematical framework of Cellular Repair System (CRS). We also present the dynamic processes of Double Strand Breaks (DSBs) and Repair Protein (RP) generating, DSB-protein complexes (DSBCs) synthesizing, and toxins accumulating under continuous radiation time.
Showing 21 to 30 of 2006 Paper Titles