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2012 2nd International conference on Advanced Computing and Communication Technologies, ACCT 2012

作者： Panjeta, Jaideep Rai, H.M. Kumar, Naresh Arora, Nancy Department of Electrical and Electronics Engineering NCIT Israna India Department of Electronics and Communication Engineering NCCE Israna India Department of Electronics and Communication Engineering NCIT Israna India

ISBN: (纸本)9780769546407

A super heater is a device that is used to convert wet, saturated steam into dry steam. Dry steam at 538oC contains more thermal energy. It increases the overall efficiency of the cycle. The modelling of the Super heater is done to control the temperature. The paper deals with simulation of control of power plant Super heaters by means of Simulink. The simulation models are developed. These are applied to electrical power generating plants in order to characterize the essential dynamic behaviour of the boiler. The corresponding models are used for the power plant processes. mathematical model of a super heater is described by sets of nonlinear partial differential equations. Estimation of the Super heater model is done by the System identification tool for design of a steam temperature control system. Data obtained by the measurement compared with simulation results. © 2012 IEEE.

关键词： Simulink

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A comparison of iris localization techniques for pattern recognition analysis

A comparison of iris localization techniques for pattern rec...

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6th Asia International conference on mathematical modelling and Computer Simulation, AMS 2012

作者： Jalil, Nor'Aini Abdul Sahak, Rohilah Saparon, Azilah Faculty of Electrical Engineering Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia

ISBN: (纸本)9780769547305

This paper presents a comparison of iris localization techniques namely, Circular Hough Transform (CHT), Daugman's Integro Differential Operator (DIDO) and Circular Boundary Detector (CBD) for localization of iris region. The difference among these three techniques are, CHT employs a segmentation technique to highlight the edges of interest and the circular shape of the iris is detected using the equation of circle, DIDO makes use of integro differential operator for locating the iris and pupil regions while CBD is developed based on the equation of circle by first selecting two points at the iris region: one at the center and the other one at the circumference of the iris. Once this selection has been made, the computation of the outer iris boundary takes place. The same procedure is repeated for the construction of inner iris boundary. The circular iris region can be un-wrapped into rectangular form for the purpose of pattern recognition analysis. The iris localization was conducted on iris images taken from healthy women free from human Papilloma Virus (HPV). The results show that CBD is able to localize the iris region for all tested iris images while using DIDO and CHT, not all iris images can be localized precisely. © 2012 IEEE.

关键词： Hough transforms

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Verifying Brahms human-robot teamwork models

Verifying Brahms human-robot teamwork models

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13th European conference on Logics in Artificial Intelligence, JELIA 2012

作者： Stocker, Richard Dennis, Louise Dixon, Clare Fisher, Michael Department of Computer Science University of Liverpool United Kingdom

ISBN: (纸本)9783642333521

Collaboration between robots and humans is an increasingly important aspect of industrial and scientific settings. In addition, significant effort is being put into the development of robot helpers for more general use in the workplace, at home, and in health-care environments. However, before such robots can be fully utilised, a comprehensive analysis of their safety is necessary. Formal verification techniques are regularly used to exhaustively assess system behaviour. Our aim is to apply such techniques to Brahms, a human-agent-robot modelling language. We show how to translate from Brahms scenarios, using a formal semantics for Brahms, into the input language of a model checker. We illustrate the approach by defining, translating, and verifying a domestic robot helper example. © 2012 Springer-Verlag.

关键词： Model checking

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Biomechanically inspired modelling of pedestrian-induced forces on laterally oscillating structures

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JOURNAL OF SOUND AND VIBRATION 2012年第16期331卷 3914-3929页

作者： Bocian, M. Macdonald, J. H. G. Burn, J. F. Univ Bristol Dept Civil Engn Bristol BS8 1TR Avon England Univ Bristol Dept Mech Engn Bristol BS8 1TR Avon England

Despite considerable interest among engineers and scientists, bi-directional interaction between walking pedestrians and lively bridges has still not been well understood. In an attempt to bridge this gap a biomechanically inspired model of the human response to lateral bridge motion is presented and explored. The simple inverted pendulum model captures the key features of pedestrian lateral balance and the resulting forces on the structure. The forces include self-excited components that can be effectively modelled as frequency-dependent added damping and mass to the structure. The results of numerical simulations are in reasonable agreement with recent experimental measurements of humans walking on a laterally oscillating treadmill, and in very good agreement with measurements on full-scale bridges. In contrast to many other models of lateral pedestrian loading, synchronisation with the bridge motion is not involved. A parametric study of the model is conducted, revealing that as pedestrians slow down as a crowd becomes more dense, their resulting lower pacing rates generate larger self-excited forces. For typical pedestrian parameters, the potential to generate negative damping arises for any lateral bridge vibration frequency above 0.43 Hz, depending on the walking frequency. Stability boundaries of the combined pedestrian-structure system are presented in terms of the structural damping ratio and pedestrian-to-bridge mass ratio, revealing complex relations between damping demand and bridge and pedestrian frequencies, due to the added mass effect. Finally it is demonstrated that the model can produce simultaneous self-excited forces on multiple structural modes, and a realistic full simulation of a large number of pedestrians, walking randomly and interacting with a bridge, produces structural behaviour in very good agreement with site observations. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： BIOMECHANICS BRIDGE vibration STRUCTURAL analysis (engineering) mathematical models OSCILLATIONS COMPUTER simulation DAMPING (Mechanics) PEDESTRIANS

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Fault mining using peer group analysis

Fault mining using peer group analysis

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34th Annual conference of the German Classification Society, GfKl 2010

作者： Weston, David J. Adams, Niall M. Kim, Yoonseong Hand, David J. Institute for Mathematical Sciences Imperial College London London United Kingdom Department of Mathematics Imperial College London London United Kingdom Industrial Systems Engineering Yonsei University Seoul Korea Republic of

ISBN: (纸本)9783642244650

There has been increasing interest in deploying data mining methods for fault detection. For the case where we have potentially large numbers of devices to monitor, we propose to use peer group analysis to identify faults. First, we identify the peer group of each device. This consists of other devices that have behaved similarly. We then monitor the behaviour of a device by measuring how well the peer group tracks the device. Should the device's behaviour deviate strongly from its peer group we flag the behaviour as an outlier. An outlier is used to indicate the potential occurrence of a fault. A device exhibiting outlier behaviour from its peer group need not be an outlier to the population of devices. Indeed a device exhibiting behaviour typical for the population of devices might deviate sufficiently far from its peer group to be flagged as an outlier. We demonstrate the usefulness of this property for detecting faults by monitoring the data output from a collection of privately run weather stations across the UK. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Statistics

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Numerical investigations of flow patterns and thermal comfort in air-conditioned lecture room

Numerical investigations of flow patterns and thermal comfor...

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10th Annual International Energy Conversion engineering conference, IECEC 2012

作者： Abou-deif, Taher M. Fouad, Mahmoud A. Khalil, Essam E. Mechanical Power Engineering Department Cairo University Giza Egypt

ISBN: (纸本)9781624101908

The present paper was concerned primarily with the analysis, simulation of the air flow and thermal patterns in a lecture room. The paper is devoted to numerically investigate the influence of location and number of ventilation and air conditioning supply and extracts openings on air flow properties in a lecture room. The work focuses on air flow patterns, thermal behaviour in lecture room where large number of students. The effectiveness of an air flow system is commonly assessed by the successful removal of sensible and latent loads from occupants with additional of attaining air pollutant at a prescribed level to attain the human thermal comfort conditions and to improve the indoor air quality;this is the main target during the present paper. The study is carried out using computational fluid dynamics (CFD) simulation techniques as embedded in the commercially available CFD code (FLUENT 6.2). The CFD modelling techniques solved the continuity, momentum and energy conservation equations in addition to standard k - Ε model equations for turbulence closure. Throughout the investigations, numerical validation is carried out by way of comparisons of numerical and experimental results. Good agreement is found among both predictions. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Thermal comfort

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7th International conference on Optimization of the Mechanical engineering, Manufacturing Systems, Robotics and Aerospace, OPTIROB 2012

7th International Conference on Optimization of the Mechanic...

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7th International conference on Optimization of the Mechanical engineering, Manufacturing Systems, Robotics and Aerospace, OPTIROB 2012

ISBN: (纸本)9783037854440

The proceedings contain 44 papers. The special focus in this conference is on development activities in the field of mechanical engineering, manufacturing systems, robotics, medical and military field. The topics include: spherical ultrasonic motor for pipe inspection robot;advanced rehabilitation technology;a 6-DoF satellite virtual simulator design and development;experimental study of vortex shedding control using plasma actuator;remote control testing consumer;flammability behavior of composite mixed with retardant agents;flammability behavior of composite mixed with retardant agents;mechatronic designed hydraulic positioning system;VBA for tracking manufacturing process in SME;possibilities of use of virtual reality in the field of manufacturing systems;torsor evaluation of the tooth during the milling process;the preliminary study of machinability during milling of titanium alloy;device used for magnetic treatment of fuel fluids before burner;mathematical simulation of leg's a 5-Dof a biped robot;modelling and kinematic analysis of a built up linear delta robot;research on correlation between any plantar diseases and stability;eye tracking used to evaluate the human behavior;adaptive drive of manipulator module;development and optimization of perimeter traversing robot and development and optimization of perimeter traversing robot.

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modelling and experimental investigation of a current to pressure converter

Modelling and experimental investigation of a current to pre...

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2012 UKACC International conference on Control, CONTROL 2012

作者： Saneecharaun, Tarik Thompson, Dave Robertson, Marc Olley, Pete Day, Andrew United Kingdom School of Engineering Design and Technology University of Bradford United Kingdom

ISBN: (纸本)9781467315609

A Current-to-Pressure (I/P) converter is a device which converts a current input, typically between 4mA and 20mA, to a proportional pressure output. Such devices are often used in valve positioners and regulators to provide accurate and flexible control. This paper describes a physics based mathematical model of an I/P converter implemented using Matlab which is capable of simulating response under dynamic conditions. Detailed physical conditions such as thermal conduction and convection (and their effects on components), compressible orifice flow and inertial movement of components have been incorporated into the model using an explicit time-stepping lumped-parameter scheme. Parameters were obtained for the model using a series of novel experimental procedures. Experimental tests were carried out on a set of I/P converters over a range of operating temperatures and input current sequences. It is shown that the correlation between the simulated results (based on only measured physical characteristics of components) and the experimental test results is quantitatively accurate. It is further shown that the simulation allows the effects of significant design changes to be predicted, and that comparison between experimental and simulated results reveals areas where complex flow behaviour modifies pressure output significantly. © 2012 IEEE.

关键词： MATLAB

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Intrusion modelling and the effect of ground water conditions

Intrusion modelling and the effect of ground water condition...

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12th Annual International conference on Water Distribution Systems Analysis 2010, WDSA 2010

作者： Collins, Richard Boxall, Joby Besner, Marie-Claude Beck, Stephen Karney, Bryan Civil and Structural Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Ecole PolytechniqueMontreal Boulevard Edouard-Montpetit Montreal QC H3T 1J4 Canada Mechanical Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom University of Toronto 35 St. George Street Toronto ON M5S 1A4 Canada

ISBN: (纸本)9780784412039

Intrusion of contaminants into water distribution systems due to negative pressures is a complex phenomena that has been theorised and is an active area of research. Work has identified the existence of contaminants in soil and ground water surrounding pipes, and has investigated modelling the risk to human health should contaminants enter water distribution systems. However, there is a lack of understanding regarding the critical interaction between the pipe, the leak aperture and the surrounding ground and water. Typical intrusion models assume a simple orifice relationship, with inflow volumes proportional to the square root of the difference between the pipe pressure and the external hydrostatic pressure. This is shown here through computational modelling to be an overly simple relationship for leak behaviour that does not take into account the existence or properties of a porous media external to the pipe. In this paper the authors will discuss the construction of computational fluid dynamics (CFD) models of the intrusion process due to transient events and describe results that suggest the simple orifice equation is not a sufficient model. In the CFD calculations the surrounding ground water is modelled as a saturated porous media and it is shown that the properties of the media and the leak geometry have a large effect on the relationship between the pressures and flow rate. It is also shown that the risk of intrusion should be considered from contaminants that originate from both above and below the depth of the pipe. Further, the idea of a zone of influence surrounding the leak point, due to the leak size and the magnitude and duration of the negative pressure, is introduced as a possible measure of the level of risk of the intrusion event. © 2012 ASCE.

关键词： Computational fluid dynamics

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FEM and BEM analysis of a human mandible with added temporomandibular joints

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Open Mechanical engineering Journal 2012年第1期6卷 100-114页

作者： Citarella, R. Armentani, E. Caputo, F. Naddeo, A. Department of Industrial Engineering University of Salerno Italy Department of Materials and Production Engineering University of Naples Federico II Italy Department of Aerospace and Mechanical Engineering Second University of Naples Italy

mathematical modelling of human mandible and its temporomandibular joints (TMJs) is one of the most important steps for developing a powerful forecasting tool to analyse the stress/strain behaviour of a human masticatory system under occlusal loads. In this work the structural behaviour of a mandible with articular discs, undergoing a unilateral occlusion, is numerically analysed by means of both Finite Element Method (FEM) and Boundary Element Method (BEM). The mandible is considered as completely edentulous and its anisotropic and non-homogeneous bone material behaviour is modelled. The material behaviour of the articular discs was assumed to be either elastic or hyper-elastic. The loads applied to the mandible are related to the active muscle groups during a unilateral occlusion. The results of FEM and BEM analyses are presented mainly in terms of stress distribution on the mandible and on the articular discs. Due to the uncertainty in the determination of the biological parameters, a sensitivity analysis is provided, which demonstrates the impact of the variation of articular disc stiffness and TMJ friction coefficient on the mandible stress peaks and on the occlusal loads (for a given intensity of muscle loads). Moreover a comparison between the effectiveness of the BEM and FEM numerical approaches on this kind of problem is provided. © Citarella et al.

关键词： Boundary element method

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