Browsing College of Engineering by Publication Date
Now showing items 21-40 of 7793
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Modeling and experimental verification of the performance of a skew mounted permanent magnet brushless DC motor drive with parameters computed from 3D-FE magnetic field solutions
( IEEE , 1994 , Article)This paper contains a comparison between actual laboratory-measured performance of a brushless dc motor drive system, with skewed permanent magnet mounts on its rotor, and two computer-simulated motor drive system performance ... -
Three dimensional magnetic field computation by a coupled vector-scalar potential method in brushless DC motors with skewed permanent magnet mounts - the no-load and load results
( IEEE , 1994 , Article)The coupled magnetic vector potential-magnetic scalar potential (CMVP-MSP) method of computation of 3D magnetic fields by finite elements (3D-FE), whose theoretical development and formulation were detailed in a companion ... -
Three dimensional magnetic field computation by a coupled vector-scalar potential method in brushless DC motors with skewed permanent magnet mounts - the formulation and FE grids
( IEEE , 1994 , Article)A three dimensional finite element (3D-FE) method for the computation of global distributions of 3D magnetic fields in electric machines containing permanent magnets is presented. The formulation of this 3D-FE method ... -
Analysis of the thermal expansion behavior of oriented polyoxymethylene sheets
( Wiley Subscription Services, Inc., A Wiley Company , 1996 , Article)The applicability of the molecular composite model is extended to include the analysis of the thermal expansion behavior of oriented (anisotropic) polyoxymethylene. The model accounts for changes in the morphological and ... -
Economic And Thermal Performance Of Thermostone In Qatar
( Qatar University , 1996 , Article)This paper is concerned with the performance characteristics of thermostone as a building material, and their comparison with those of hollow concrete blocks. Carrier Advanced Load Program (E20-II) was used to estimate the ... -
Coupled vector-scalar potential method for 3D magnetostatic field computations using hexahedral finite elements
( IEEE , 1996 , Article)This paper introduces a three dimensional finite element (3D-FE) method based on a coupled vector-scalar potential formulation. The method is most suited for large-scale magnetostatic field applications containing mixed ... -
Three-dimensional finite element analysis of permanent magnet brushless DC motor drives - Status of the state of the art
( IEEE , 1996 , Article)This paper reviews recent advances in the state of the art of applying three-dimensional finite-element (3-D-FE) magnetic field computation techniques to the analysis and quantification of parameters and performance of ... -
A Spreadsheet Teaching Tool For Analysis Of Pipe Networks
( Qatar University , 1997 , Article)Spreadsheets are used widely in engineering to perform several analysis and design calculations. They are also very attractive as educational tools due to their flexibility and efficiency. This paper demonstrates the use ... -
Optimization of the skew angle of rotor magnetic poles in permanent magnet machines based on the inverse problem method
( IEEE , 1997 , Conference Paper)This paper presents optimization of the skew angle of rotor magnetic poles in permanent magnet class of machines. The skew angle optimization is achieved using the gradient based inverse problem methodology. The paper ... -
Numerical study of magneto-fluid-mechanic combined free-and-forced convection heat transfer
( Elsevier , 1998 , Article)Fully-developed, laminar, steady, free-and-forced convection heat transfer in an electrically-conducting fluid flowing in an electrically-insulated, horizontal, circular pipe (with its wall subjected to a uniform heat flux) ... -
Use of Mathcad as a teaching and learning tool for reinforced concrete design of footings
( John Wiley & Sons, Inc. , 1999 , Article)Owing to their nature, numerous and complex equations are commonly used in the design of reinforced concrete structures. This is because of the nature of reinforced concrete design. Mathcad, which possesses efficient ... -
Optimization of the skew angle of rotor poles in permanent magnet machines based on the inverse problem method
( IEEE , 1999 , Article)This paper presents optimization of the skew angle of rotor magnetic poles in permanent magnet brushless dc machines. The skew angle optimization is achieved using the gradient based inverse problem methodology. The paper ... -
Experimental study of exhaust emissions and performance of a dual fuel IDI diesel engine
(1999 , Conference Paper)Dual fuel engines of the compression ignition type provide an alternative approach for I.C. engines to improve economy, reduce exhaust emissions and achieve a greater power. The present contribution is an experimental ... -
Detection of seizure signals in newborns
( IEEE , 1999 , Conference Paper)This paper considers a system design for processing a multidimensional biomedical signal formed by EEG, ECG, EOG and motion recorded from a newborn, for the purpose of detection of epileptic seizures in newborns as an ... -
Speed control of induction motor without rotational transducers
( IEEE , 1999 , Article)This paper describes a newly developed speed sensorless drive based on neural networks. A backpropagation neural network is used to provide real-time adaptive identification of the motor speed. The estimation objective is ... -
Viscous-Gravity spreading of oil on water
( John Wiley & Sons, Inc. , 2001 , Article)Spreading of oil on calm water is analyzed for the second stage of spread, which is controlled by a balance between gravity and viscous forces. The analysis, using the integral boundary-layer method, agreed well with a ... -
Fuzzy time domain and Z-transform for modeling of harmonic electric loads
( IEEE , 2001 , Conference Paper)This paper demonstrates the application of fuzzy systems and Z-transform for electric load modeling in the presence and/or absence of harmonics. The problem is formulated as one of linear optimization, where the objective ... -
Theory and simulation of a miniature zirconia sensor for control of the air-to-fuel ratio in combustion systems
( IEEE , 2001 , Article)The theory of operation on both sides of stoichiometry of a miniature zirconia oxygen pump-gauge incorporating a diffusion hole is discussed. Computer simulation of the sensor output when used for monitoring the air-to-fuel ... -
Effects of harmonic distortion on the active and reactive power measurements in the time domain: A single phase system
( IEEE Computer Society , 2001 , Conference Paper)A new application of the least error squares (LES) estimation algorithm is given for identifying, in the time domain, the active and reactive power from available samples of voltage and current waveforms. The digital ... -
Frequency and harmonics evaluation in power networks using fuzzy regression technique
( IEEE Computer Society , 2001 , Conference Paper)A new technique for frequency and harmonic evaluation in power networks is proposed in this paper. This technique is based on fuzzy linear regression and uses the digitized voltage samples, which are fuzzy numbers, to ...