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20th International conference on engineering Design (ICED)

作者： Koessler, Johannes Paetzold, Kristin Univ Bundeswehr Munchen Munich Germany

ISBN: (纸本)9781904670742

The development of technical systems is faced with an increasing complexity. A reason for this is the growing number of domains working together for a final product. Thereby the system integration is getting more important for companies while the development of single components is often outsourced to other companies. This leads to the need of detailed interfaces descriptions between these components to support the product development process and the data and information flows. In this paper the initial steps to automatically generated behavioural simulation models are presented. The fundament for the generation of these models is model-based system engineering (MBSE). The available diagrams of MBSE are used to generate the main structure of a behaviour model. In addition partial models have been developed describing the behaviour of machine elements. Combining the MBSE models with the partial behaviour models allows the generation of a behaviour model of a complete system. A first validation of the concept of automatically generated models is presented. Based on simple MBSE and CAD models of a gear unit, different behaviour models are generated for the use with Matlab/Simulink.

关键词： Complexity Functional modelling Systems engineering (SE) Model-based systems engineering (MBSE) Interfaces

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mathematical modelling of human Heart as a Hydroelectromechanical System

Mathematical Modelling of Human Heart as a Hydroelectromecha...

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8th International conference on Electrical and Electronics engineering (ELECO)

作者： Yalcinkaya, Fikret Kizilkaplan, Ertem Erbas, Ali Kirikkale Univ Dept Elect & Elect Engn TR-71450 Yahsihan Kirikkale Turkey

ISBN: (纸本)9786050105049

Different electrical models of human heart, partial or complete, with linear or nonlinear models have been developed. In the literature, there are some applications of mathematical and physical analog models of total artificial heart (TAH), a baroreceptor model, a state-space model, an electromechanical biventricular model of the heart, and a mathematical model for the artificial generation of electrocardiogram (ECG) signals. Physical models are suitable to simulate real physiological data based on proper experimental set up present. This paper introduces a new mathematical modelling of human heart as a hydroelectromechanical system (HEMS). This paper simulates the human heart based on three main functions: hydraulic, electrical and mechanical parameters. Hydro-mechanical model developed then has been transformed into electrical domain and simulation has been carried out according to the mathematical model or formulations obtained using Laplace transform. This electrical model / circuit is then tested by MATLAB based simulations and results found are comparable with the normal ECG waveforms so that these simulated results may be useful in clinical experiments. In this model basic electrical components have been used to simulate the physiological functions of the human heart. The result is a simple electrical circuit consisting of main electrical parameters that are transformed from hydraulic models and medical physiological values. Developed MATLAB based mathematical model will primarely help to understand the proper functioning of an artificial heart and its simulated ECG signals. A comprehensive model for generating a wide variety of such signals has been targeted for future in this paper. This research especially focuses on modelling human heart as a hydro-electro-mechanical system with three case studies.

关键词： Hydro-electro-mechanical Heart Model Matlab Simulation Cardiovascular System Biomedical Circulatory System

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Evaluation of noise behaviour of amultistage gearbox

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FORSCHUNG IM INGENIEURWESEN-engineering RESEARCH 2018年第4期82卷 411-423页

作者： Utakapan, T. Kohn, B. Fromberger, M. Otto, M. Stahl, K. Tech Univ Munich Gear Res Ctr FZG Garching Germany

The noise behaviour of gearboxes is influenced substantially by gear mesh excitation. Therefore, low level of mesh excitation is one of major design goals being considered as soon as possible in the design stage. There are many approaches are available for the evaluation of gear noise behavior in the literature. These can be categorized into quasistatic and dynamic approaches. Despite comprehensive results, the dynamic simulation is quite time-consuming and needs extensive effort on modelling. Therefore, this approach is not suitable for the gear design stage. When the calculation time is critical, the quasistatic approaches are advantageous thanks to the simplification of mathematical terms in the calculation. Therefore, they are preferred in the design and optimatization stage. However, quasistatic approaches are focused mainly on evaluation of noise behaviour of single-stage gearboxes so far. In order to enable the evaluation for multistage gearboxes, the tooth excitations of each gear mesh can be extended into the bearing force. Furthermore, the bearing force level can be derived from this measurement and used as vibration indicator. In this paper, validation of the bearing force and bearing force level is investigated by means of vibration measurements on a multistage gearbox. The correlation of the numerical bearing force and measured structure borne noise is investigated. Additionally, the geometrical position of the result excitation due to engagement angles varies in time for multistage gearboxes. The spectral analysis of the total excitation is performed by means of its orthogonal components.

关键词： Spectrum analysis

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Safety properties modelling

Safety properties modelling

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7th International conference on human System Interactions (HSI)

作者： Tanzi, Tullio J. Textoris, Raoul Apvrille, Ludovic Telecom ParisTech Inst Mines Telecom CNRS LTCI UMR 5141 Sophia Antipolis France LOreal Clichy Paris France Mines Pparis Tech Ctr Rech Risques Crises Sophia Antipolis France

ISBN: (纸本)9781479947140

In critical applications regarding safety, a solution must be validated before it is applied on the field. It is forbidden to test solutions directly on the real system for safety reasons. Any attempt of modification or introduction of a safety system must be approached with the utmost care. The proposed solutions must be validated, and, if possible, formally validated. It is the case of prevention systems for accidents, installed on highways. They also are in charge of gathering information in the case of an accident actually occurring. In this context, we aim to provide an approach to validate the behaviour of a critical system before its effective realisation. The system is modelled by a combination of agents spread around the world and working together in real-time. The agents' behaviour is modelled via an UML SysML model. Thanks to the tools available in the TTool environment and the ones developed only for this purpose, we can animate those agents and confirm, or not, their behaviour on various test situations (applications' rapid prototyping). Since the tests are not covering all the possibilities, we move to, then, verify formally the critical properties. This formal analysis is made possible by the mathematical grounds of the tool we use. The analysed properties are mainly safety properties;results regarding performance results are available as well.

关键词： Formal Methods modelling Safety Properties

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modelling flow and work hardening behaviour of cold worked Zr-2.5Nb pressure tube material in the temperature range of 30-600 °C

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NUCLEAR engineering AND DESIGN 2014年 269卷 52-56页

作者： Dureja, A. K. Sinha, S. K. Pawaskar, D. N. Seshu, P. Chakravartty, J. K. Sinha, R. K. Bhabha Atom Res Ctr Reactor Design & Dev Grp Mumbai 400085 Maharashtra India Indian Inst Technol Dept Mech Engn Mumbai 400076 Maharashtra India Bhabha Atom Res Ctr Mech Met Div Mumbai 400085 Maharashtra India Dept Atom Energy Mumbai Maharashtra India

Under a postulated accident scenario of loss of cooling medium in an Indian Pressurised Heavy Water Reactor (IPHWR), temperature of the pressure tubes can rise and lead to large deformations. In order to investigate the modes of deformation of pressure tube - calandria tube assembly, material property data defining the flow behaviour over a temperature range from room temperature (RT) to 800 degrees C are needed. It is of practical importance to formulate mathematical equations to describe the stress-strain relationships of a material for a variety of reasons, such as the analysis of forming operations and the assessment of component's performance in service. A number of constitutive relations of empirical nature have been proposed and they have been found very suitable to describe the behaviour of a material. Although these relations are of empirical nature, various metallurgical factors appear to decide applicability of each of these relations. For example, grain size influences mainly the friction stress while the strain hardening is governed by dislocation density. In a recent work, tensile deformation behaviour of pressure tube material of IPHWR has been carried out over a range of temperature and strain rates (Dureja et al., 2011). It has been found that the strength parameters (yield and ultimate tensile strength) vary along the length of the tube with higher strength at the trailing end as compared to the leading end. This stems from cooling of the billet during the extrusion process which results in the variation of microstructure, texture and dislocation density from the leading to the trailing end. In addition, the variation in metallurgical parameters is also expected to influence the work hardening behaviour, which is known to control the plastic instability (related to uniform strain). In the present investigation, the tensile flow and work-hardening behaviour of a cold worked Zr-2.5Nb pressure tube material of IPHWRs has been studied over the temperat

关键词： Strain rate

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Compositional security modelling: Structure, economics, and behaviour

Compositional security modelling: Structure, economics, and ...

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2nd International conference on human Aspects of Information Security, Privacy, and Trust, HAS 2014 - Held as Part of 16th International conference on human-Computer Interaction, HCI International 2014

作者： Caulfield, Tristan Pym, David Williams, Julian Department of Computer Science University College London United Kingdom Business School University of Durham United Kingdom

ISBN: (纸本)9783319076195

Security managers face the challenge of formulating and implementing policies that deliver their desired system security postures - for example, their preferred balance of confidentiality, integrity, and availability - within budget (monetary and otherwise). In this paper, we describe a security modelling methodology, grounded in rigorous mathematical systems modelling and economics, that captures the managers' policies and the behavioural choices of agents operating within the system. Models are executable, so allowing systematic experimental exploration of the system-policy co-design space, and compositional, so managing the complexity of large-scale systems. © 2014 Springer International Publishing.

关键词： Economics

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Methodology of human factors analysis for systems engineering

Methodology of human factors analysis for systems engineerin...

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Proceedings of 1993 International conference on Systems, Man and Cybernetics

作者： Cacciabue, Pietro Carlo Inst for Systems Engineering and Informatics Italy

ISBN: (纸本)0780309111

This paper discusses how the problem of handling human erroneous behaviour can appropriately be studied by a methodology that comprises four modelling phases, namely: 1) a paradigm of human behaviour;2) a taxonomy and related tables for human erroneous actions;3) the evaluation of the correlation with the real working environment;and 4) the procedure for applying the methodology to different types of analysis and at different levels of complexity. While the first two elements have been described somewhere else, this paper focuses on the connection of the taxonomy with the real working environment and on the application procedure.

关键词： human engineering

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The memory tesseract: mathematical equivalence between composite and separate storage memory models

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JOURNAL OF mathematical PSYCHOLOGY 2017年 77卷 142-155页

作者： Kelly, Mary Alexandria Mewhort, D. J. K. West, Robert L. Carleton Univ Ottawa ON Canada Queens Univ Kingston ON Canada

Computational memory models can explain the behaviour of human memory in diverse experimental paradigms. But research has produced a profusion of competing models, and, as different models focus on different phenomena, there is no best model. However, by examining commonalities among models, we can move towards theoretical unification. Computational memory models can be grouped into composite and separate storage models. We prove that MINERVA 2, a separate storage model of long-term memory, is mathematically equivalent to composite storage memory implemented as a fourth order tensor, and approximately equivalent to a fourth-order tensor compressed into a holographic vector. Building of these demonstrations, we show that MINERVA 2 and related separate storage models can be implemented in neurons. Our work clarifies the relationship between composite and separate storage models of memory, and thereby moves memory models a step closer to theoretical unification. (C) 2016 Elsevier Inc. All rights reserved.

关键词： Memory Cognitive modelling Computational modelling MINERVA 2 Vectors Tensors Holographic reduced representations HRRs Associative memory Neural networks

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PENETRATION OF ELECTRIC-FIELDS INTO A CONCENTRIC-SPHERE MODEL OF BIOLOGICAL TISSUE

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MEDICAL & BIOLOGICAL engineering & COMPUTING 1986年第1期24卷 105-108页

作者： HART, FX MARINO, AA LOUISIANA STATE UNIV MED CTRDEPT ORTHOPAED SURGSHREVEPORTLA 71130 UNIV SOUTH DEPT PHYSSEWANEETN 37375

In this paper we present an exact calculation based on a mathematical model comprising a sphere of tissue surrounded by a concentric shell of a second tissue. The concentric structure, and a third medium in which it is embedded, can have arbitrary relative permittivities and conductivities. The calculation yields the steady-state electric field in each tissue following application of an electric field of arbitrary magnitude and frequency in the outer medium. The general behaviour of the result is described and we show it can be applied to specific studies including human and animal studies, effects on tissues and cellular effects.

关键词： Biological tissue Brain Electric field modelling

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Integrating human behaviour into Factory Simulation - a Feasibility Study

Integrating Human Behaviour into Factory Simulation - a Feas...

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IEEE International conference on Industrial engineering and engineering Management (IEEM 2009)

作者： Riedel, Ralph Mueller, Egon von der Weth, Ruediger Pflugradt, Noah Tech Univ Chemnitz Dept Factory Planning & Factory Management Chemnitz Germany Univ Appl Sci Dresden Dept Human Resources & Ergonom Dresden Germany

ISBN: (纸本)9781424448692

As the environment of manufacturing enterprises is becoming more complex and dynamic this requires powerful tools for the support of decisions in manufacturing and production planning. Simulation as one of those tools has been widely applied in manufacturing and logistics. However, the models used for simulation are incomplete because the human factor in terms of its decision making and behaviour is considered only rudimentary. This leads to suboptimal decisions and to a gap when implementing solutions in practice. The paper presents an approach for enriching the common (technical) simulation models with need controlled human agents. The agent is based on a formalised motivation theory. In a feasibility study several typical settings, like ramp up curves and learning effects, were tested. The approach is unique in the field of simulation with a big potential for higher quality in analysing and designing production systems.

关键词： human factors modelling simulation

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