Research Title: Characteristics and Analysis for Mechanical Instrumentation Used to Measure Fluid Viscosity

Author: Nabil Musa Wanas, Published Year: 2016

International Journal of Innovative Science and Modern Engineering (IJISME), 4

Faculty: Engineering and Technology

Abstract: The task of development of the measurement procedure and the general-purpose control equipment which can allow us to analyze fluid rheological properties and to ascertain the dependence of the stress tensor of the sample on the deformation tensor over a wide range of strain rates is urgent nowadays. At the same time the question of providing the continuous inspection of the product properties under the condition of high precision and measuring automation is a matter of principle.

Keywords: viscosimeter, measuring automation.

Research Title: The Use of Genetic Approach to the kinematics of Cutting

Author: Nabil Musa Wanas, Published Year: 2016

World Journal of Mechanics, 6

Faculty: Engineering and Technology

Abstract: This article deals with the use of an interdisciplinary approach to modelling and creation of a complex technical system of different physical nature in relation to the kinematics of cutting and shaping. The professor of the National Technical University of Ukraine Kuznetcov Iu.N, proposed the approach based on generalization of knowledge, methodological basis of which is the theory of evolution of the systems and methods of genetic analysis and synthesis. For generalization of the knowledge in the fundamental sciences is based on the principles of a limited number of elementary generic structures with the introduction of the gene concept. The modelling and synthesis of kinematic cutting schemes are providing the efficiency and viability of genetic and morphological approach. The material point, which can interact with other material points in space and time, simulating anthropogenic system of different origin, is introduced as a material object.

Keywords: genetic approach, kinematics of cutting, technical system, rotary motion, material point

Research Title: WHIRL INTERACTION OF A DRILL BIT WITH THE BORE-HOLE BOTTOM

Author: Nabil Musa Wanas, Published Year: 2015

Modern Mechanical Engineering, 5

Faculty: Engineering and Technology

Abstract: This paper deals with the theoretic simulation of a drill bit whirling under conditions of its contact interaction with the bore-hole bottom rock plane. The bit is considered to be an absolutely rigid ellipsoidal body with uneven surface. It is attached to the lower end of a rotating elastic drill string. In the perturbed state, the bit can roll without sliding on the bore-hole bottom, performing whirling vibrations (the model of dynamic equilibrium with pure rolling when maximum cohesive force does not exceed the ultimate Coulombic friction). To describe these motions, a nonholonomic dynamic model is proposed, constitutive partial differential equations are deduced. With their use, the whirling vibrations of oblong and oblate ellipsoidal bits are analyzed, the functions of cohesive (frictional) forces are calculated. It is shown that the system of elastic drill string and ellipsoidal bit can acquire stable or unstable whirl modes with approaching critical Eulerian values by the parameters of axial force, torque and angular velocity. The analogy of the found modes of motions with ones of the Celtic stones is established. It is shown that the ellipsoidal bits can stop their whirling vibrations and change directions of their circumferential motions in the same manner as the ellipsoidal Celtic stones do. As this takes place, the trajectories of the oblate ellipsoidal bits are characterized by more complicated paths and irregularities. Key words: deep drilling; ellipsoidal bits; nonholonomic dynamics; Celtic stones; instability; forward and backward whirling motions.

Keywords: deep drilling; ellipsoidal bits; nonholonomic dynamics; Celtic stones; instability; forward and backward whirling motions.

Research Title: Grid-Connected Multilevel Topology for HVDC Offshore Wind Farm Based on MFT

Author: Firas Abdullah Obeidat, Published Year: 2013

. Power Electronics Technology Journal,

Faculty: Engineering and Technology

Abstract: This paper presents a new topology to connect HVDC offshore wind farm into the grid; the offshore part consist of five units, each unit contain permanent magnet synchronous generator (PMSG) connected to 3-phase/3-phase matrix converter (MC) to control the generator speed by using a MPPT control. The offshore platform consists of a three phase Medium Frequency Transformer (MFT) and a three phase Modular Multilevel Converter (MMC); the primary of each phase of the transformer connected to one phase from each unit. The secondary of the transformer connected to three phase MMC to get High Voltage DC (HVDC). The HVDC cable will be used to transfer power from the offshore side to the onshore side. Five levels MMC is used in the onshore side to control the DC voltage and to connect the offshore wind farm into the Grid by converting the HVDC to HVAC.

Keywords: PMSG; Three Phase Matrix Converter; MFT; MMC; Series DC Wind Farm

Research Title: Grid-Connected Multilevel Topology for HVDC Offshore Wind Farm

Author: Firas Abdullah Obeidat, Published Year: 2013

Electric machines and Control,

Faculty: Engineering and Technology

Abstract: This paper presents a topology to connect HVDC offshore wind farm into the grid; the offshore part consist of five units, each one contains permanent magnet synchronous generator (PMSG) connected to a three level neutral point clamped converter (3L-NPC) which works as a rectifier to control the generator speed by using a maximum power point tracking (MPPT) control. The offshore platform consists of a half bridge connected in series to balance the voltage between units and to collect the voltage in order to get the desired DC voltage. The HVDC cable will be used to transfer power from the offshore side to the onshore side. A Modular Multilevel Converter (MMC) is used in the onshore side to convert the voltage from DC to AC voltage and to connect the offshore wind farm into the Grid.

Keywords: PMSG; 3L-NPC; Half Bridge; MMC; Series DC Wind Farm.

Research Title: Reliability Prediction of PV Inverters Based on MIL-217F N2

Author: Firas Abdullah Obeidat, Published Year: 2015

42nd IEEE Photovoltaic Specialists Conference (42nd IEEE PVSC), New Orleans, USA

Faculty: Engineering and Technology

Abstract: This paper initially discusses the reliability of a 250W Photovoltaic (PV) micro inverter. Using the bill of materials the reliabilities of the main, gate drive, power supply, current and voltage sensing and microprocessor circuits were investigated, and the failure rate and Mean Time Between Failure (MTBF) calculated. The sum of component failure rates equals the complete PV micro inverter failure rate. To account for temperature effects the component failure rate was calculated for each inverter operating temperature, and multiplied by the percentage occurrence of this operating temperature to obtain a weighted failure rate. A similar procedure was used to calculate the failure rate for the main circuits of a 4.6kW & a 4.5kW multi-string inverter. All calculations are based on MIL-17F N2 method.

Keywords: Failure rate, MIL-HDBK-217F N2, PV micro inverter, PV multi string inverter, Reliability prediction.

Research Title: Simulation of Grid Connected HVDC Offshore Wind Farm Topologies

Author: Firas Abdullah Obeidat, Published Year: 2013

The 10th IEEE International Conference on Power Electronics and Drive Systems (PEDS2013), Kitakyushu, Japan

Faculty: Engineering and Technology

Abstract: This paper presents two topologies to connect HVDC offshore wind farm into the grid, the offshore part consist of five units; in the first topology, each unit contains a permanent magnet synchronous generator (PMSG) connected to a three level neutral point clamped converter (3L-NPC) to control the generator speed by using a maximum power point tracking (MPPT) control. The offshore platform consists of a half bridge connected in series to balance the voltage between the units and to collect the voltage in order to get the desired DC voltage. In the second topology, each unit contains a PMSG connected to 3-phase/3-phase matrix converter (MC) to control the generator speed by using a MPPT control. The offshore platform consists of a three phase High Frequency Transformer (HFT); the primary of each phase of the transformer connected to one phase from each unit. The secondary of the transformer connected to three phase diode bridge rectifier to get HVDC. The HVDC cable is used to transfer power from the offshore side to the onshore side. A Modular Multilevel Converter (MMC) is used in the onshore side to convert the voltage from DC to AC voltage and to integrate the offshore wind farm into the Grid.

Keywords: PMSG, MPPT, 3L-NPC, Half Bridge, Matrix Converter, HFT, MMC, HVDC Offshore Wind Farm.

Research Title: The Application of Three Level NPC Converter for Wind Power Generator

Author: Firas Abdullah Obeidat, Published Year: 2012

2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, Harbin, China

Faculty: Engineering and Technology

Abstract: This paper presents the control of a three level back to back converter with Permanent Magnet Synchronous Machine (PMSM). Field Oriented Control (FOC) is used to control the speed and the current of PMSM. Space Vector Pulse Width Modulation (SVPWM) is used to control the Three Level Rectifier and the Three Level Voltage Source Inverter. The simulation tests of the system have been developed based on Simulink/Matlab.

Keywords: Wind Turbine; Three phase Three Level Convertr; PMSM; SVPWM.

Research Title: Software Evolution: A Features Variability Modeling Approach

Author: Said Ahmad Ammar Ghoul, Published Year: 2016

Journal of Software Engineering, 10 (5)

Faculty: Information Technology

Abstract: Abstract: Background: Software Product Lines (SPLs) have been used successfully for building software systems families. One of techniques that are widely used to support SPL’s variability modelling is feature modelling. These methods have been used to recognize and manage commonalities and variability among products. But like anything in this world, software systems families are rapidly changing and demanding for more dynamic capabilities. Materials and Methods: One of the challenging problems of dynamic SPLs is that feature modelling techniques are unable to support dynamic capabilities and their formalization. In fact, feature modelling techniques support well elementary features, but the composed ones are not yet supported nor formalized. This study aims to deal with this challenge. It extends the conventional elementary feature modelling concepts, with composed feature and inherent relations concepts. According to bio-inspired approach, a software configuration comes up by composing its features from elementary or any other composed features. Then this configuration may evolve through its life cycle by metamorphosing, changing from a composed feature to another. Results: This software feature-based evolution variability modelling technique has led to an introduction of a new methodology producing an extended feature model by new meta features and relations. The combination of two formalisms in the specification of this methodology is more powerful than a unique one. Conclusion: The obtained results compared to the actual approaches seem to be promising. The bio-inspired software evolution has led to identify weaknesses of currents feature-based evolution approaches. The introduction of new powerful feature modelling concepts and supporting formal approach, inspired from nature is expected to promote the software evolution.

Keywords: Feature model, Variablity modelling, Software productlines, software evolution, software configuration

Research Title: A Road Map to Bio-inspired Software Engineering

Author: Said Ahmad Ammar Ghoul, Published Year: 2016

Research Journal of Information Technology, 8 (3)

Faculty: Information Technology

Abstract: Abstract: Background: Software production study is rapidly evolving in two parallel approaches: Conventional and bio-inspired. Bio-inspired approaches are generally developed and presented as enhancements of conventional ones. However, conventional approaches benefit from their integration with their global context, through software engineering methodologies for being advantageous. Materials and Methods: The integration of bio-inspired approaches, with bio-inspired software engineering methodologies will enrich bio-inspired approaches and let them be irrefutably the best. This study identifies the motivations of the emergence of such bio-inspired software engineering, presents a first approach to it with a road map and some of its challenges. Results: The application of this first approach on different software systems categories is presented with its summary evaluation. The richness and expressiveness of the concepts introduced by bio-inspired methodologies are strong compared with the conventional ones. However, the evaluation on real industrial software scale remains an open challenge. Conclusion: The obtained results prove the power, the effectiveness and simplicity of the bio-inspired methodologies compared to the conventional ones. The conventional software engineering is not inspired from nature processes and therefore, there is a gap between his concepts and mechanisms and those of real world. This leads to complexity and poverty in its models and their applications. However, this is the strength of the bio-inspired software engineering.

Keywords: Software engineering, bi-inspired software engineering