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11th International Energy Conversion engineering conference, IECEC 2013

作者： Abou-Deif, Taher M. Khalil, Essam E. Mechanical Power Engineering Department Cairo University Giza Egypt

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;using unsteady technique, and comparing the results to previous work which was using steady technique. 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.

关键词： Air conditioning

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Tasks for Teaching Scientific Approach Using the Black Box Method

Tasks for Teaching Scientific Approach Using the Black Box M...

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12th European conference e-Learning (ECEL)

作者： Capay, Martin Magdin, Martin Constantine Philosopher Univ Dept Informat Fac Nat Sci Nitra Slovakia

ISBN: (纸本)9781909507845

The Black Box is a substantial system with internal organization, structure and element behaviour, about which the observer has no information, but has the option to impact the whole system via its inputs and observe its reactions via its outputs. The observation of the black box is therefore behavioural. In the paper, we point out the possibility of alternative methods of teaching algorithms using the Black Box Method, which raise the curiosity of students and their desire to uncover the mystery. These boxes should be used as group activities at school or even as a solitary activity at home. Black box applications are also suitable as a part of e-sources in blended learning methods. In the paper, we will present tasks that can be programmed and in which it is important to know the basic, often very simple, mathematical relations. The activities described in the paper can be used in mathematics lessons and extended on programming lessons. We strive to describe how to use black boxes in educational practice and, furthermore, how to present principles of reverse engineering. We teach them the basic skills of scientific approach: to analyze the current situation, form hypotheses and consequently verify the correctness of stated assumptions. We mostly presented the tasks on a variety of training and educational workshops. In our experience, applications functioning as black boxes were proved to be adequate "recovery" activities within longer lectures (university), as well as an example of playful learning activities. This concept can be used in teaching, or even in leisure activities, for the activation of students. The contribution of the Black Box Method lies in development of students' curiosity, systematic approach and critical thinking while gaining new knowledge.

关键词： activating teaching methods black box scientific approach algorithm blended learning modelling and simulation

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Rule-Based behaviour engineering: Integrated, Intuitive Formal Rule modelling

Rule-Based Behaviour Engineering: Integrated, Intuitive Form...

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Australian conference on Software engineering

作者： Lin Wah Chan Rene Hexel Lian Wen School of Information and Communication Technology Griffith University Brisbane Australia

ISBN: (纸本)9781479902262

Requirement engineering is a difficult task which has a critical impact on software quality. Errors related to requirements are considered the most expensive types of software errors. They are the major cause of project delays and cost overruns. Software developers need to cooperate with multiple stakeholders with different backgrounds and concerns. The developers need to investigate an unfamiliar problem space and make the transition from the informal problem space to the formal solution space. The requirement engineering process should use systematic methods which are constructive, incremental, and rigorous. The methods also need to be easy to use and understand so that they can be used for communication among different stakeholders. Is it possible to invent a human intuitive modelling methodology which systematically translates the informal requirements into a formally defined model? behaviour engineering has arguably solved many problems. However, the size and low level of the final Behavior Tree makes it hard to match with the original requirements. Here, we propose a new requirement modelling approach called Rule-Based behaviour engineering. We separate two concerns, rules and procedural behaviours, right at the beginning of the requirement modelling process. We combine the Behavior Tree notation for procedural behaviour modelling with a non-monotonic logic called Clausal Defeasible Logic for rule modelling. In a systematic way, the target model is constructed incrementally in four well-defined steps. Both the representations of rules and procedural flows are humanly readable and intuitive. The result is an effective mechanism for formally modelling requirements, detecting requirement defects, and providing a set of tools for communication among stakeholders.

关键词： Ovens Cognition Software Unified modeling language Systematics Natural languages Object oriented modeling

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Modeling of human Arm Movement: A Study on Daily Movement

Modeling of Human Arm Movement: A Study on Daily Movement

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International conference on Computational Intelligence, modelling and Simulation (CSSIM)

作者： Tasnuva Tabashhum Choudhury Md. Mozasser Rahman Aida Khorshidtalab Md. Raisuddin Khan Dept. of Mechatronics Engineering IIUM Malaysia

Mimicking human arm motion has become a challenging topic for the researchers among the field of human rehabilitation, motor control and perception, biomechanics, and several other related research topics. Considering human-robot cooperation, this paper is focused on modeling human arm while performing planner motion. In this work human arm is assumed as a mass-spring-damper system and based on this assumption the related mathematical model is developed. The desired movement in this study is one of the daily activities with obstacle. mathematical model is developed with the help of the robotic principle, mechanical system analysis method, and also with the help of biological data. The kinematic and dynamic data is then analyzed. In this work kinematic data are taken from the ShapTape® device. The different components of the position, velocity and acceleration are compared. Besides, the analysis of the simulated torques is done. MATLAB is used for the simulation. These observations are expected to give several ideas for designing a controller for upper limb exoskeleton for rehabilitation purposes.

关键词： Torque Elbow mathematical model Shoulder Robots Acceleration Kinematics

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Performance Analysis of a Wind Turbine Driven Swash Plate Pump for Large Scale Offshore Applications

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Journal of Physics: conference Series 2014年第1期555卷

作者： D Buhagiar T Sant To whom any correspondence should be addressed Department of Mechanical Engineering Faculty of Engineering University of Malta Msida Malta MSD 2080

This paper deals with the performance modelling and analysis of offshore wind turbine-driven hydraulic pumps. The concept consists of an open loop hydraulic system with the rotor main shaft directly coupled to a swash plate pump to supply pressurised sea water. A mathematical model is derived to cater for the steady state behaviour of entire system. A simplified model for the pump is implemented together with different control scheme options for regulating the rotor shaft power. A new control scheme is investigated, based on the combined use of hydraulic pressure and pitch control. Using a steady-state analysis, the study shows how the adoption of alternative control schemes in a the wind turbine-hydraulic pump system may result in higher energy yields than those from a conventional system with an electrical generator and standard pitch control for power regulation. This is in particular the case with the new control scheme investigated in this study that is based on the combined use of pressure and rotor blade pitch control.

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D-Q axis modelling analysis of a shaded pole induction motorand study of the non-linear behaviour

D-Q axis modelling analysis of a shaded pole induction motor...

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International conference on Power, Energy and Control (ICPEC)

作者： Animesh Karmakar Nihar Ranjan Roy Rajarshi Mukherjee Pradip Kumar Saha Gautam Kumar Panda Electrical Department Jalpaiguri Government Engineering College India Electrical Department Jalpaiguri Government Engineering College India

ISBN: (纸本)9781467360272

The D-Qaxis modelling of the shaded-pole induction motor employing the state vector analysis is approached to determinethe periodicity and chaotic phenomenon under different system parameters are observed. Accordingly, a chaotic-speed control of a fan can be achieved by appropriately varying the motors' internal parameters or the operation condition. Computer simulations have been developed to confirm the proposed non-linear model of the single-phase induction motor.

关键词： Induction motors Coils Chaos mathematical model Integrated circuit modeling Rotors Windings

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Towards improved 1-D settler modelling: Calibration of the Bürger model and case study 86

Towards improved 1-D settler modelling: Calibration of the B...

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86th Annual Water Environment Federation Technical Exhibition and conference, WEFTEC 2013

作者： Torfs, Elena Vlasschaert, Pieter Amerlinck, Youri Bürger, Raimund Diehl, Stefan Farås, Sebastian Nopens, Ingmar BIOMATH Department of Mathematical Modelling Statistics and Bioinformatics Faculty of Bioscience Engineering Ghent University Coupure Links 653 Ghent9000 Belgium CI2MA Departamento de Ingeniería Matemática Facultad de Ciencias Físicas y Matemáticas Universidad de Concepción Casilla 160-C Concepción Chile Centre for Mathematical Sciences Lund University P.O. Box 118 LundS-221 00 Sweden

ISBN: (纸本)9781510870444

Recently, Bürger et al. (2011) developed a new 1-D SST model which allows for more realistic predictions of the sludge settling behaviour than traditional 1-D models used to date. However, the addition of a compression function in this new 1-D model complicates the model calibration. This study aims to report advances in the calibration of this novel 1-D model. Data of the evolution of the sludge blanket height during batch settling experiments were collected at different initial solids concentrations. Based on the linear slopes of the batch settling curves the hindered settling velocity functions by Vesilind (1968) and Takács et al. (1991) were calibrated. Although both settling velocity functions gave a good fit to the experimental data, very large confidence intervals were found for the parameters of the settling velocity by Takács. Global sensitivity analysis showed that it is not possible to find a unique set of parameter values for the settling function by Takács based on experimental data of the hindered settling velocity. Subsequently, the calibrated Vesilind settling velocity was implemented in the 1-D model by Bürger et al. (2011) and the parameters of the additional compression function were calibrated by fitting the model by Bürger et al. (2011) to the batch settling curves. Simulation results showed that while the 1-D model by Takács et al. (1991) underpredicted the experimental data of sludge blanket heights, the model by Bürger et al. (2011) was able to predict the experimental data far more accurately. However, a global sensitivity analysis showed that no unique optimum for the combined set of hindered and compression parameters could be found. Copyright ©2013 Water Environment Federation. All Rights Reserved.

关键词： Sensitivity analysis

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Implementation of automatic ship berthing using artificial neural network for free running experiment

Implementation of automatic ship berthing using artificial n...

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9th IFAC conference on Control Applications in Marine Systems, CAMS 2013

作者： Ahmed, Yaseen Adnan Hasegawa, Kazuhiko Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka Japan Division of Global Architecture Department of Naval Architecture and Ocean Engineering 2-1 Yamadaoka Suita Osaka Japan

ISBN: (纸本)9783902823526

Ship berthing has always considered as a multiple input multiple output phenomenon. And such controlling action becomes even more sophisticated when the ship approaches to a pier especially in low speed. The current and presence of wind also make the task more complicated. But, if a human brain can be replicated by any artificial intelligence technique to perform the same necessary action that human brain does, then automatic operation during complete berthing process is believed to be possible by many researchers. For that purpose as an initial stage of this research, artificial neural network is chosen as one of AI techniques for automatic berthing and to increase its learnability, concentration is given on the consistency of the teaching data provided. To do that, nonlinear programming method is used where ship's actual behavior is predicted using famous manoeuvring mathematical group model. After successfully training, ANN controller is tested for various known and unknown condition including wind disturbances and found good results. Finally, to verify the simulated successful results, the current research is based on execution of free running experiment with the implementation of automatic ship berthing using the same trained ANN where adequate decisions for command rudder and propeller revolution taken are decided automatically depending on real time multiple input parameters. © IFAC.

关键词： Global positioning system

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Multi-scale modelling and diffraction-based characterization of elastic behaviour of human enamel

Multi-scale modelling and diffraction-based characterization...

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13th International conference on Fracture（ICF13）

作者： Tan Sui Michael A.Sandholzer Nikolaos Baimpas Igor Dolbnya Gabriel Landini Alexander M.Korsunsky Department of Engineering Science University of OxfordParks RoadOxford OX1 3PJUK School of Dentistry College of Medical and Dental SciencesUniversity of BirminghamSt Chad's QueenswayBirmingham B4 6NNUK

The relationship between the ultrastructure of haman enamel and its mechanical behaviour is studied in this *** synchrotron X-ray diffraction techniques,wide and small angle X-ray scattering (WAXS/SAXS) were used in c... 详细信息

关键词： HAP Multi-scale modelling and diffraction-based characterization of elastic behaviour of human enamel

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Probabilistic modelling of electric vehicles' parking lots charging demand

Probabilistic modelling of electric vehicles' parking lots c...

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Iranian conference on Electrical engineering (ICEE)

作者： M. H. Amini M. Parsa Moghaddam Department of Electrical and Computer Engineering Tarbiat Modares University Iran

Increasing growing of electricity demand and environmental issues bring huge incentives to electric vehicles (EVs) market. EVs will improve the functionalities of present power system. On the other hand, unscheduled high penetration of EVs may have detrimental effects on power system performance. Reliability and stability are the most aspects of grid that face challenges when EVs used widely. As a result there is an exigent need to predict the EVs' customers in order to avoid irreparable effects, especially for the distribution network. In this paper, firstly a EVs' customer behaviour model will be discussed. Secondly, a probabilistic modelling of EVs' charging demand is introduced. This consummate model is on the two bases: technical specifications of different EV classes and historical driving data. Finally, sensitivity analysis is done in order to validate the model performance.

关键词： mathematical model Probabilistic logic Electricity Smart grids Power system stability Electric vehicles

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