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2nd IASTED International conference on Biomedical engineering

作者： Roubik, K Dusek, J Czech Tech Univ Fac Elect Engn Dept Radioelectr CZ-16627 Prague Czech Republic

ISBN: (纸本)088986408X

The article deals with evaluation of image quality by various methods and comparison of their results. Generally, there are several ways how to assess image quality. Three main approaches are: subjective testing, objective testing and image quality evaluation using a human visual system (HVS) model. The subjective testing is based on human perception, the objective one on mathematical computing and the human visual system models on mathematical modelling of human vision respecting features of the human perception. Then, the described methods and two designed models of HVS are used for image quality evaluation on a set of images. Results of the modelling were compared with results of the subjective and objective methods.

关键词： human visual system model image quality

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modelling a drop test of a landing gear using a hybrid bond graph

Modelling a drop test of a landing gear using a hybrid bond ...

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32nd IASTED International conference on modelling, Identification and Control, MIC 2013

作者： Margetts, Rebecca Ngwompo, Roger F. Da Cruz, Marcelin Fortes University of Bath Dept. Mechanical Engineering Bath BA2 7AY United Kingdom Airbus Operations Ltd. New Filton House Filton Bristol BS99 7AR United Kingdom

ISBN: (纸本)9780889869431

A landing gear is a good example of a highly nonlinear multidisciplinary system. Using hybrid modelling, nonlinear behaviour can be abstracted to discontinuous behaviour. Bond graphs are an established and intuitive method for constructing mathematical models of multi-physics dynamic systems. The Hybrid Bond Graph is therefore used here to demonstrate the modelling of a landing gear drop test. A distinction is drawn between structural and parametric discontinuities, represented using controlled junctions and elements. Causally static and dynamic bond graphs are compared. A mixed Boolean mathematical model is obtained from the causally dynamic graph.

关键词： Graph theory

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Diagrammatic Models in the engineering Sciences

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FOUNDATIONS OF SCIENCE 2008年第2期13卷 127-142页

作者： Boon, Mieke Univ Twente Dept Philosophy NL-7500 AE Enschede Netherlands

This paper is concerned with scientific reasoning in the engineering sciences. engineering sciences aim at explaining, predicting and describing physical phenomena occurring in technological devices. The focus of this paper is on mathematical description. These mathematical descriptions are important to computer-aided engineering or design programs (CAE and CAD). The first part of this paper explains why a traditional view, according to which scientific laws explain and predict phenomena and processes, is problematic. In the second part, the reasons of these methodological difficulties are analyzed. Ludwig Prandtl's method of integrating a theoretical and empirical approach is used as an example of good scientific practice. Based on this analysis, a distinction is made between different types of laws that play a role in constructing mathematical descriptions of phenomena. A central assumption in understanding research methodology is that, instead of scientific laws, knowledge of capacities and mechanisms are primary in the engineering sciences. Another important aspect in methodology of the engineering sciences is that in explaining a phenomenon or process spatial regions are distinguished in which distinct physical behaviour occur. The mechanisms in distinct spatial regions are represented in a so-called diagrammatic model. The construction of a mathematical description of the phenomenon or process is based on this diagrammatic model.

关键词： engineering science Diagrammatic models Methodology Prandtl mathematical modelling Scientific practice Experiments

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behaviour and Reasoning Description Language (BRDL) 3rd

Behaviour and Reasoning Description Language (BRDL)

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17th International conference on Software engineering and Formal Methods (SEFM)

作者： Cerone, Antonio Nazarbayev Univ Dept Comp Sci Nur Sultan Kazakhstan

ISBN: (纸本)9783030575069;9783030575052

In this paper we present a basic language for describing human behaviour and reasoning and present the cognitive architecture underlying the semantics of the language. The language is illustrated through a number of examples showing its ability to model human reasoning, problem solving, deliberate behaviour and automatic behaviour. We expect that the simple notation and its intuitive semantics may address the needs of practitioners from non matematical backgrounds, in particular psychologists, linguists and other social scientists. The language usage is twofold, aiming at the formal modelling and analysis of interactive systems and the comparison and validation of alternative models of memory and cognition.

关键词： Cognitive science human reasoning Problem solving human behavior Formal methods

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mathematical modelling of Thin-Walled Cold-Rolled Cross-Section

Mathematical Modelling of Thin-Walled Cold-Rolled Cross-Sect...

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6th International Scientific conference on Dynamic of Civil engineering and Transport Structures and Wind engineering (DYN-WIND)

作者： Flodr, Jakub Krejsa, Martin Mikolasek, David Sucharda, Oldrich Zidek, Libor Tech Univ Ostrava VSB Fac Civil Engn Dept Struct Mech Ludvika Podeste 1875-17 Ostrava 70833 Czech Republic Tech Univ Ostrava VSB Fac Civil Engn Lab Bldg Mat Ostrava 70833 Czech Republic

ISBN: (纸本)9783038351979

The purpose of the paper is to perform a static analysis of a thin-wall cold-rolled steel cross-section of a trapezoidal sheet by means of a mathematical model developed in ANSYS, commercially available software applications. The trapezoidal sheets are used typically as an external cladding which covers the structures of steel halls. Investigating into behaviour of the trapezoidal sheets subjected to extreme loads represents an urgent issue in wind engineering. A physical tension test has been performed in order to verify and confirm the mathematical model. Experiments have been performed to prove results of the static analysis into the behaviour of a load-carrying structure formed by a thin-wall cross-section.

关键词： numerical modelling wind engineering thin-walled cold-rolled cross-section steel structure trapezoidal sheet finite element method FEM ANSYS

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The impact of microbiological tools on mathematical modelling of biological wastewater treatment

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WATER SCIENCE AND TECHNOLOGY 1997年第10期36卷 97-108页

作者： Pollard, PC von Munch, EV Lant, PA Greenfield, PF Univ Queensland Adv Wastewater Management Ctr St Lucia Qld 4072 Australia

Biological systems are being used to treat an increasing range of complex wastes;domestic and industrial wastewaters containing nutrients and refractory organic compounds, soil sites and groundwater contaminated by organics, and organic solid residues. These treatment processes rely on micro-organisms and, more than ever before, must deliver higher quality outcomes at higher levels of reliability to protect the environment. At the same time, pressures to deliver cost-effective treatment have increased. The challenge for these biological treatment technologies and the associated engineering is to achieve the environmental and economic goals simultaneously. mathematical modelling is an essential component in developing a detailed understanding of such processes, as well as design guidelines and suitable operating and control strategies. This paper provides a brief summary of the development of mathematical models for biological waste treatment systems, why they have become increasingly complex and how certain microbiological tools can provide the experimental means to validate more complex segregated and structured models of biological behaviour. With a number of specific modelling examples in the field of wastewater treatment, we illustrate the potential of these modern microbiological tools and their implications for gaining an improved understanding of biological waste treatment. (C) 1997 IAWQ. Published by Elsevier Science Ltd.

关键词： modelling wastewater bacteria growth rates molecular probes

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Software tools for data modelling and processing of human body temperature circadian dynamics 37

Software tools for data modelling and processing of human bo...

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37th Annual International conference of the IEEE-engineering-in-Medicine-and-Biology-Society (EMBC)

作者： Petrova, Elena S. Afanasova, Anastasia I. Ulyanovsk State Univ. Ulyanovsk Russia

This paper is presenting a software development for simulating and processing thermometry data. The motivation of this research is the miniaturization of actuators attached to human body which allow frequent temperatu... 详细信息

ISBN: (纸本)9781424492701

关键词： biomedical measurement biothermics medical computing patient diagnosis temperature measurement data modelling human body temperature circadian dynamics medical diagnosis procedure software tool thermometry data processing thermometry data simulation Biological system modeling Computational modeling Data models mathematical model Software Temperature distribution Temperature measurement

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modelling of unsteady-state hydrodynamics in periodically operated trickle-bed reactors:: Influence of the liquid-phase physical properties

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CHEMICAL engineering SCIENCE 2007年第24期62卷 7011-7019页

作者： Brkljac, Bojana Bludowsky, Thomas Dietrich, Wulf Gruenewald, Marcus Agar, David W. Univ Dortmund Dept Biochem & Chem Engn Chair React Engn D-44227 Dortmund Germany

Process intensification using periodic operation of trickle bed reactors (TBRs) is still a long way from replacing conventional steady-state operation in industrial use, despite the numerous benefits described in the literature. Complex interactions between hydrodynamics, mass transfer and reaction phenomena make the design of periodically operated TBRs an almost insurmountable challenge. The development of hydrodynamic models able to provide reliable quantitative predictions of flow behaviour and possessing a sound physical basis, is an essential prerequisite for obtaining the necessary insights into this complexity. In this work, the two-phase pressure drop and dynamic liquid hold-up during max/min and on/off periodical operation were predicted using a model based on the relative permeability concept. In order to demonstrate the utility of this approach, a systematic investigation of the quantitative influence of the liquid-phase physical properties was carried out. The results obtained show that the modelling of the hydrodynamics in periodically operated TBRs using the relative permeability concept is feasible. By selecting suitable permeability parameters, unsteady-state hydrodynamics for different periodic operating modes can be predicted successfully. (C) 2007 Elsevier Ltd. All rights reserved.

关键词： reaction engineering trickle-bed reactors mathematical modelling dynamic simulation hydrodynamics periodic operation

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mathematical MODEL FOR ROTOR BEARING SYSTEM BY CONSIDERING THE EFFECT OF SHAFT DYNAMICS AND LOCALIZED BEARING DEFECTS

MATHEMATICAL MODEL FOR ROTOR BEARING SYSTEM BY CONSIDERING T...

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ASME International Design engineering Technical conference / Computer and Information in engineering conference (IDETC/CIE)

作者： Upadhyay, N. Jules, M. Kankar, P. K. Nbendjo, B. R. Nana PDPM Indian Inst Informat Technol Design & Mfg Ja Machine Dynam & Vibrat Lab Mech Engn Discipline Jabalpur 482005 Madhya Pradesh India Univ Yaounde I Lab Modelling & Simulat Engn Biomimet & Prototype Fac Sci POB 812 Yaounde Cameroon

ISBN: (纸本)9780791850206

This work is focused on development of model for unbalanced rotor bearing system to predict system behaviour in dynamic environment. In this model, nonlinearity is introduced due to two factors, namely, clearance of bearing and localized bearing races defects. The contact between the races and balls is considered as Hertzian contact which results in nonlinear restoring force due to elastic deformation in contact zone. In the mathematical formulation, the shaft is considered as rotating Timoshenko beam, supported on two ball bearings. After modelling of shaft corresponding equations representing the system behaviour has been formulated. The governing equations of motion are solved by Sixth order Runge-Kutta method. Bifurcation plots have been plotted to understand the state of the system in healthy condition and due to localized defects on races of the bearings. The Frequency spectrum and phase trajectory diagrams are also plotted for better understanding of the system response.

关键词： Runge Kutta methods

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Computational fluid dynamics modelling of gas jets impinging onto liquid pools

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APPLIED mathematical modelling 2006年第11期30卷 1472-1484页

作者： Nguyen, Anh V. Evans, Geoffrey M. Univ Newcastle Sch Engn Callaghan NSW 2308 Australia

Gas jets impinging onto a gas-liquid interface of a liquid pool are studied using computational fluid dynamics modelling, which aims to obtain a better understanding of the behaviour of the gas jets used metallurgical engineering industry. The gas and liquid flows are modelled using the volume of fluid technique. The governing equations are formulated using the density and viscosity of the "gas-liquid mixture", which are described in terms of the phase volume fraction. Reynolds averaging is applied to yield a set of Reynolds-averaged conservation equations for the mass and momentum, and the k-epsilon turbulence model. The deformation of the gas-liquid interface is modelled by the pressure jump across the interface via the Young-Laplace equation. The governing equations in the axisymmetric cylindrical coordinates are solved using the commercial CFD code, FLUENT. The computed results are compared with experimental and theoretical data reported in the literature. The CFD modelling allows the simultaneous evaluation of the gas flow field, the free liquid surface and the bulk liquid flow, and provides useful insight to the highly complex, and industrially significant flows in the jetting system. (c) 2006 Elsevier Inc. All rights reserved.

关键词： impinging gas jets liquid pool velocity field free surface profile

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