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Situation awareness in synthetic environments: Towards a computational model

Situation awareness in synthetic environments: Towards a com...

引用

2nd Indian international conference on Artificial Intelligence, IICAI 2005

作者： Bhatt, Mehul Rahayu, Wenny Sterling, Gerald Department of Computer Science La Trobe University Melbourne 3086 Australia Air-Operations Division Defence Science Technology Organisation PO Box 4331 Melbourne Australia

ISBN: (纸本)0972741216

The simulation of the behaviour of autonomous entities in space is an interesting research method to advance our understanding of the interaction of human beings with the environment. Although rather complex cognitive models of human-level Situation Awareness (SA) in dynamic environments exist, computational approaches to represent the same remain at best ad-hoc - cognitively inadequate or bearing little or no resemblance to the qualitative manner in which humans seemingly represent & reason about knowledge. The aim of our research is to investigate the computational aspects of situation awareness of autonomous entities in large-scale simulated spaces, called Synthetic Environments (SE). This is done within the scope of an understanding of situation awareness that encompasses common-sense conceptual reasoning and integrated qualitative reasoning about space, time & causality As a product of our research, we envisage to develop a logic based computational framework based on a unified representational semantics for space, time & causality - the essence of which is a process model involving abstract ontological commitments involving spatial, temporal and action event oriented concepts, alongwith a capability to handle concurrent and continuous phenomena. The framework, which is representative of our model of situation awareness, will be most beneficial for systems involving the representation of physical and/or intelligent autonomous processes. However, as an exemplar of our approach, we are interested in applying the framework for the representation of autonomous behaviour in defence modelling & simulation (M&S) applications. Copyright © IICAI 2005.

关键词： Semantics

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Experimental and numerical simulation of thermomechanlcal phenomena during a TIG welding process

Experimental and numerical simulation of thermomechanlcal ph...

引用

ictpmcs: 2nd international conference on thermal process modelling and computer simulation

作者： Depradeux, L. Jullien, J.-F. URGC Bât. JCA Coulomb INSA 20 avenue Albert Einstein 69621 Villeurbanne Cedex France

In this study, a parallel experimental and numerical simulation of phenomena that take place in the Heat Affected Zone during TIG welding on 316L stainless steel is presented. The aim of this study is to predict by numerical simulation residual stresses and distortions generated by the welding process. For the experiment, a very simple geometry with reduced dimensions is considered: the specimens are disks, made of 316L. The discs are heated in the central zone in order to reproduce thermo-mechanical cycles that take place in the HAZ during a TIG welding process. During and after thermal cycle, a large quantity of measurement is provided, and allows to compare the results of different numerical models used in the simulations. The comparative thermal and mechanical analysis allows to assess the general ability of the numerical models to describe the structural behavior. The importance of the heat input rate and material characteristics is also investigated. © EDP Sciences.

关键词： Welding

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computer predictions of thermo-mechanlcal behavior and residual stresses in spray coating process

Computer predictions of thermo-mechanlcal behavior and resid...

引用

ictpmcs: 2nd international conference on thermal process modelling and computer simulation

作者： Ju, D.-Y. Ji, V. Gassot, H. Department of Materials Science and Engineering Saitama Institute of Technology Fusaiji 1690 Okabe Saitama 369-02 Japan LM3 ENSAM 15 boulevard de l'Hôpital 75013 Paris France Institut de Physique Nucléaire d'Orsay 91406 Orsay France

This paper presents a numerical method in order to forecast the thermo-mechanical behavior and the residual stresses in the thermal spray coating process by using high velocity oxygen fuel (HVOF). A set of coupled equations of the heat conduction and stress/strain and solidification based on the metallothermo-mechanical theory is introduced into the simulation of thermal spraying. Here, an inelastic constitutive equation with capacity to represent relation of stress/strain during rapid solidification is employed. The numerical modelling based on the finite element method is proposed to solve the heat conduction associated with solidification in the sprayed layer and residual stresses on the interface between multi-layer materials, especially. In this paper, the simulated results of the temperature field, solidified domain and residual stresses in the sprayed layer including interfacial combinations between substrate and spray layer are presented, and the validity of the calculated results is discussed in comparison with the measured results obtained by X-ray diffraction. © EDP Sciences.

关键词： Sprayed coatings

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modelling the ferrite/carbide &rarr austenite transformation of hypoeutectoid and hypereutectoid steels

Modelling the ferrite/carbide &rarr austenite transformation...

引用

ictpmcs: 2nd international conference on thermal process modelling and computer simulation

作者： Surm, H. Kessler, O. Hunkel, M. Hoffmann, F. Mayr, P. Stiftung Institut für Werkstofftechnik Bremen Germany

In the project "Distortion compatible heating during heat treatment" of the Collaborative Research Center 570 "Distortion Engineering" the mechanisms of distortion development during heating are analyzed. The factors of the austenitizing process influencing distortion during heat treatment are investigated by experiments as well as by computer simulation. To predict distortion during heating with computer simulation, the ferrite + carbide into austenite transformation has to be modeled accurately. A model, based on the Johnson-Mehl-Avrami equation, was developed to describe the transformation of hypoeutectoid and hypereutectoid steels during continuous heating with constant heating rate. © EDP Sciences.

关键词： Austenitic transformations

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Achieving manufacturing qualify and reliability using thru-process simulation

Achieving manufacturing qualify and reliability using thru-p...

引用

ictpmcs: 2nd international conference on thermal process modelling and computer simulation

作者： Chen, X.L. Yang, Z. Nanjundan, A. Chen, N. Janosch, J.-J. Technical Center Caterpillar Inc. Peoria IL 61656 United States

Manufacturing of heavy industrial components such as the front linkage, case frame and car body of construction and mining equipments involves multiple processes including thermal cutting, bending/forming and welding. Distortion, welding joint integrity and manufacturing variability pose significant challenges on today's manufacturing. In this paper, the authors presented VFT™ - Virtual Fabrication Technology [1], a thru-process simulation package, developed at the technical center of Caterpillar Inc., Peoria, IL, USA and Battelle Memorial Institute, Columbus Ohio, USA. VFT is a trademark of Battelle Memorial Institute. This work was performed under the support of the US Department of Commerce, National Institute of Standards, Advanced Technology Program. Steel rolling simulation, thermal cutting simulation, bending and welding simulation capabilities in the VFT software have significantly reduced the time and cost of manufacturing process developments as well as to achieve competitive advantages through quality improvement and differentiated products. Besides the Caterpillar applications, VFT software has also found applications in shipbuilding, nuclear piping, and automotive industry. " EDP Sciences.

关键词： process control

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Numerical simulation of inertia friction welding process of GH4169 alloy

Numerical simulation of inertia friction welding process of ...

引用

ictpmcs: 2nd international conference on thermal process modelling and computer simulation

作者： Zhang, Liwen Liu, Chengdong Qi, Shaoan Yu, Yongsi Zhu, Wenhui Qu, Shen Wang, Jinghe Dalian University of Technology Materials Engineering Department China

Friction welding is a solid state welding technology with good quality and high automation. It has been widely used in many industry fields especially in automobile and aerospace industry. Because of the characters of less process parameters and high automation, inertia friction welding is popular in many fields. In this paper, a 2-D thermo-mechanical FEM model was developed to simulate inertia welding process. In this model, the temperature dependency of the thermal and mechanical properties of material was considered. The finite-element software *** was used to calculate the temperature field, stress field and strain field during inertia friction welding process. The transient temperature field and the deformation of GH4169 superalloy during inertia friction welding process were predicted. The temperature filed during inertia friction welding process was measured by means of thermocouples. The calculated temperature filed is in good agreement with the experimental result. © EDP Sciences.

关键词： Alloying elements

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modelling of precipitation of carbides during tempering of martensite

Modelling of precipitation of carbides during tempering of m...

引用

2nd international conference on thermal process modelling and computer simulation

作者： Wang, Y Denis, S Appolaire, B Archambault, P Ecole Mines UHP INPL CNRS LSG2MUMR 7584 F-54042 Nancy France

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modelling of retained austenite in carburized layers

Modelling of retained austenite in carburized layers

引用

ictpmcs: 2nd international conference on thermal process modelling and computer simulation

作者： Przylȩcka, M. Gȩstwa, W. Totten, G.E. Poznań University of Technology Poznań Poland G.E.Totten and Associates LLC Seattle WA United States

In this paper, modelling of the phase composition of the carburized case produced on steel alloys containing chromium, manganese and nickel will be discussed. In particular, the effect of steel composition on the amount of retained austenite and carbide structure will be discussed. These microstrucures were selected because they exhibit the greatest influence on the correlation between structure and properties of hardened carburized case. The thermal process largely influences the formation of carbides quantity of residual austenite in structure of hardened carburized elements. Properties evaluated include: hardness, micro-hardness, and impact resistance. The model can be applied to carburized 20H (20Cr4), 15HN (17CrNi6-6) and 16HG (16MNCr5) steel although data for 20H (20Cr4) steel is provided here. © EDP Sciences.

关键词： Austenite

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simulation of thermal processes: Solutions studied in the automotive industry

Simulation of thermal processes: Solutions studied in the au...

引用

2nd international conference on thermal process modelling and computer simulation

作者： Plateau, M PSA Peugeot Citroen Velizy Villacoublay France

The aim of simulation for industry is reducing the cost of prototyping. Manufacturing of automotive parts uses thermal processes: heat treatment, welding, forging and casting. In some few applications, we Succeed in having good results. But, nowadays, we cannot say we earn a lot of money thanks to simulation because the available tools are not completely adapted to our problematic and we have a large lack of data. That is the reason we work with other industries, schools and software producers.

关键词： Thermoanalysis

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modelling of phase transformations and hardening of carbonitrided steel

Modelling of phase transformations and hardening of carbonit...

引用

ictpmcs: 2nd international conference on thermal process modelling and computer simulation

作者： Przylȩka, M. Gȩstwa, W. Totten, G.E. Poznań University of Technology Poznań Poland G.E.Totten and Associates LLC Seattle WA United States

There are a variety of opinions regarding the influence of retained austenite and carbides on the properties exhibited by carbonitrided steels. In this paper, the development of a model marking relationship between phase composition, and properties of hardened carbonitrided steel has been presented, A summary of the impact of structure on properties is provided in Table 1, In the study reported here, the impact of thermal processing conditions on retained austenite and carbides was examined for carbonitrided and hardened 20 (C22), 20H (20Cr4), 15HN (17CrNi6-6) and 16HG (16MnCr5) steels. The models that are reported were experimentally validated. In particular, the results obtained for structure with respect to hardness and abrasive wear resistance were discussed for carbonitrided and hardened 20H (20Cr4) steel. © EDP Sciences.

关键词： Steel

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