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Subject = Mechanical Engineering;
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Displaying Results 1 - 25 of 494 on page 1 of 20
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Columnar to Equiaxed Transition in Peritectic TiAl Based Alloy Studied by a Power-Down Technique
(2014)
MOONEY, ROBIN
Columnar to Equiaxed Transition in Peritectic TiAl Based Alloy Studied by a Power-Down Technique
(2014)
MOONEY, ROBIN
http://hdl.handle.net/2262/76206
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An investigation into Bridgman furnace solidification of titanium alloys
(2013)
MOONEY, ROBIN; MCFADDEN, SHAUN
An investigation into Bridgman furnace solidification of titanium alloys
(2013)
MOONEY, ROBIN; MCFADDEN, SHAUN
http://hdl.handle.net/2262/75677
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3D transient thermal modelling of laser microchannel fabrication in lime-soda glass
(2008)
Issa, Ahmed A.A.; Brabazon, Dermot; Hashmi, Saleem
3D transient thermal modelling of laser microchannel fabrication in lime-soda glass
(2008)
Issa, Ahmed A.A.; Brabazon, Dermot; Hashmi, Saleem
Abstract:
Laser-fabricated microchannels in glass offer a wide range of bioengineering and telecommunication applications. A 1.5 kW CO2 laser with 10.6 μm wavelength was used in this study to fabricate micorchannels on the surface of soda-lime glass sheets. A thermal model of the process was developed based on transient heat conduction due to a pulsed heat input. The resulting equation predicted the temperature distribution in the regions surrounding the laser focus. Temperature – time curves were drawn from those equations, which were useful in estimating the thermal history in the processed samples. The temperature distribution was also used to predict the channel geometry (based on the vaporisation temperature of glass). Most of the laser power used was consumed in bringing the glass to the vaporisation temperature. The model was able to predict the channel width, depth and surface roughness. These laser-fabricated channel characteristics were measured and compared to the results obtained ...
http://doras.dcu.ie/20057/
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A Bridgman Furnace Front Tracking Model
(2015)
Mooney, Robin Patrick
A Bridgman Furnace Front Tracking Model
(2015)
Mooney, Robin Patrick
Abstract:
The Bridgman furnace is widely used in industry and research, mainly because it provides a means to directionally solidify materials in a controlled manner, so that the resulting microstructure, and hence material properties, can be manipulated. This thesis details, firstly, the development and verification of a numerical Front Tracking Model (FTM) to track the position of, and growth conditions at, the columnar front during transient directional solidification in a Bridgman furnace; and, secondly, its application to experiments investigating Columnar to Equiaxed Transition (CET) in a gamma TiAl multicomponent hypoperitectic alloy. Previous FTMs have been applied in fixed grid numerical domains where the solidifying material - normally of hypoeutectic composition - is contained within that domain throughout simulations; the model demonstrated here accounts for movement of material through the domain and is adapted for hypoperitectic solidification. The model is applied, firstly, to ...
http://hdl.handle.net/2262/74991
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A centrifugal microfluidic platform for capturing, assaying and manipulation of beads and biological cells
(2012)
Burger, Robert
A centrifugal microfluidic platform for capturing, assaying and manipulation of beads and biological cells
(2012)
Burger, Robert
Abstract:
Microfluidics is deemed a field with great opportunities, especially for applications in medical diagnostics. The vision is to miniaturize processes typically performed in a central clinical lab into small, simple to use devices - so called lab-on-a-chip (LOC) systems. A wide variety of concepts for liquid actuation have been developed, including pressure driven flow, electro-osmotic actuation or capillary driven methods. This work is based on the centrifugal platform (lab-on-a-disc). Fluid actuation is performed by the forces induced due to the rotation of the disc, thus eliminating the need for external pumps since only a spindle motor is necessary to rotate the disc and propel the liquids inside of the micro structures. Lab-on-a-disc systems are especially promising for point-of-care applications involving particles or cells due to the centrifugal force present in a rotating system. Capturing, assaying and identification of biological cells and microparticles are important operat...
http://doras.dcu.ie/17525/
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A comparison study of applying metallic coating on SiC particles for manufacturing of cast aluminum matrix composites
(2015)
Taherzadeh Mousavian, Reza; Damadi, S.R.; Azari Khosroshahi, Rasoul; Brabazon, Dermot
A comparison study of applying metallic coating on SiC particles for manufacturing of cast aluminum matrix composites
(2015)
Taherzadeh Mousavian, Reza; Damadi, S.R.; Azari Khosroshahi, Rasoul; Brabazon, Dermot
Abstract:
Ceramic particles typically do not have a sufficiently high wettability for incorporation into molten metal during aluminum matrix composite manufacturing. Metallic coatings on ceramic particles could improve their wettability by the molten aluminum and hence provide a better bonding between the reinforcement and matrix. In this study, micrometer-sized SiC particles were coated by copper, nickel, and cobalt metallic layers using electroless deposition method. These metallic layers were produced separately prior to ceramic incorporation into molten pure aluminum, in order to compare their effects on the microstructure and mechanical properties of the produced composites. The experimental results showed that copper was the most effective and nickel the least effective of these coating metals for incorporation of the SiC particles into the molten aluminum. It was additionally found that the composite, which contained the copper coated SiC particles, produced the highest microhardness a...
http://doras.dcu.ie/21110/
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A computational and experimental analysis of impact to aircraft structures
(2005)
Kennedy, Pierce
A computational and experimental analysis of impact to aircraft structures
(2005)
Kennedy, Pierce
Abstract:
The modelling and analysis of high energy impact on aircraft structures is highly complex. Traditional methods give only a limited understanding of what occurs and it is evident from the continuing problem of uncontained engine failure and other debris impact that a more accurate way of predicting the results of such impacts is needed. Finite element techniques can provide that solution. This work attempts to model accurately impacts to existing aircraft structures. Of particular interest is the behaviour at the ballistic velocity as this is where the problem is most difficult to predict. Initially the model consisted of a simple sheet subject to impact by a cylindrical projectile. This was used to develop the modelling techniques for the more complex model. Issues that arose included the mesh density, the material model and the penalty stiffness factor used. Experimental testing was carried out using a gas fired projectile launcher to validate the finite element model. The geometr...
http://doras.dcu.ie/17981/
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A computational investigation of the laser bonding of balloon catheters
(2015)
Ryan, Enda
A computational investigation of the laser bonding of balloon catheters
(2015)
Ryan, Enda
Abstract:
The balloon catheters produced by Boston Scientific are manufactured using a laser bonding process. The behaviour of the materials during this laser welding process is not very well understood. In this work a computational model of this process was created which will help predict the behaviour of the materials during bonding and will increase understanding of the laser bonding process. The two parts being bonded are cylindrical and are both made of a thermoplastic polymer called PEBAX®. During the bonding process, these cylindrical parts are surrounded by a heat-shrink tubing which applies a pressure to the PEBAX® parts when heated. The heat and pressure cause the PEBAX® to melt and flow. Modelling the heat-shrink tubing and the melt flow during the laser welding process are key aims of this work. A thermal model of the process was created by modelling the laser absorption and heat transfer through the assembly. This was compared with previous work and validated with experimental da...
http://hdl.handle.net/10379/5310
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A critical investigation into the spray-drying of hydroxyapatite powder for thermal spray applications
(2006)
Murtaza, Qasim
A critical investigation into the spray-drying of hydroxyapatite powder for thermal spray applications
(2006)
Murtaza, Qasim
Abstract:
This work examines the investigation of the spray drying process of Hydroxyapatite powder (HA) used as a thermal spray deposit in the application of orthopaedic femoral implants. In this research, the Niro- Minor™ mixed spray dryer was used for both modelling and experimental studies. The process parameters investigated included HA slurry viscosity, temperature, and air flowrate. Computational Fluid Dynamic (CFD) modelling and validation of the spray drying of HA powder was performed. An analysis of the spray drying of the HA slurry, was performed using the UMETRI AB, MODDE 7 software. For the CFD analysis, the Spray dryer was divided into the three parts; two-fluid nozzle, the drying chamber, and atomisation. The Standard K-e, Reliable K-e and Reynolds Stress Model models were used to predict velocity profiles of the air, feed pipe of the two external nozzle and temperature profile for the drying chamber. Different model results were compared, studied and compared with experimenta...
http://doras.dcu.ie/17586/
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A critical study on the strategy for capital machinery manufacturing SMEs in Bangladesh
(2005)
Islam, Mollah Shahidul
A critical study on the strategy for capital machinery manufacturing SMEs in Bangladesh
(2005)
Islam, Mollah Shahidul
Abstract:
This study presents the results of a research programme carried out on small and medium sized enterprises (SME) of manufacturing industrial capital machinery in Bangladesh. The study is intended to establish the market potential of industrial capital machinery (ICM), barriers to growth and government policy support issues towards the development of ICM manufacturing SMEs. This research involved the study of manufacturing industries, case studies on the manufacture of capital machinery and designing a postal survey questionnaire which was mailed to industries, government departments and raw material suppliers in Bangladesh. The questionnaire was designed with an aim to collect, information on opportunities, barriers to manufacturing, strategy of procurement and sales of ICM, use of locally available industrial indigenous resources, strength of AMT, size and performance of the SMEs and the impact of government policy on the growth of ICM manufacturing SMEs. Based on the result of th...
http://doras.dcu.ie/17929/
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A detailed study of desalination exergy models and their application to a semi-conductor ultra-pure water plant
(2011)
Fitzsimons, Lorna
A detailed study of desalination exergy models and their application to a semi-conductor ultra-pure water plant
(2011)
Fitzsimons, Lorna
Abstract:
Ultra-Pure Water (UPW) is a high energy raw material used in the semiconductor manufacturing industry. However, to date, the production of UPW has received little focus in terms of energy consumption mitigation. Exergy analysis is perhaps the most powerful tool available in the search for industrial energy efficiency. The objective of this research was to develop an approach for the exergy analysis of Semiconductor UPW plants in an effort to characterise energy consumption. However, following an extensive literature review, it became evident that several desalination exergy models were in current use, and it was unclear which model was the most appropriate, presenting a serious challenge to researchers seeking to apply exergy analysis to water purification processes. A detailed study and comparison of two predominant desalination exergy models was undertaken to determine the most appropriate model for UPW and other water purification applications. Neither of these models was deemed ...
http://doras.dcu.ie/16388/
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A finite element and experimental analysis of energy absorbing systems under static and dynamic loading conditions
(2006)
Morris, Edmund
A finite element and experimental analysis of energy absorbing systems under static and dynamic loading conditions
(2006)
Morris, Edmund
Abstract:
Knowledge of the behaviour of kinetic energy absorbers or impact attenuating devices is of paramount importance to design and research engineers involved in the automobile, aircraft, spacecraft, and nuclear industries. The main function of these devices is to minimise injury to personnel, to protect cargo that contain hazardous materials or to protect delicate structures from possible impact damage. Such industries require these devices to dissipate kinetic energy into an irreversible form and more importantly, in a controlled and desired manner. The performance of kinetic energy absorbers is significantly affected by various physical parameters such as material properties, mode of deformation and the nature of loading, with strain rate and inertial effects playing an important role due to high velocity impact. This work details the experimental and computational analysis of circular and oblong shaped kinetic energy absorbers subjected to quasi-static and dynamic lateral loading. T...
http://doras.dcu.ie/18086/
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A finite element approach for the implementation of magnetostrictive material terfenol-D in automotive CNG fuel injection actuation
(2008)
Choadhury, Habibullah Amin
A finite element approach for the implementation of magnetostrictive material terfenol-D in automotive CNG fuel injection actuation
(2008)
Choadhury, Habibullah Amin
Abstract:
Magnetostriction is the deformation that spontaneously occurs in ferromagnetic materials when an external magnetic field is applied. In applications broadly defined for actuation, magnetostrictive material Terfenol-D possesses intrinsic rapid response times while providing small and accurate displacements and high-energy efficiency, which are some of the essential parameters required for fast control of fuel injector valves for decreased engine emissions and lower fuel consumption compared with the traditional solenoid fuel injection system. A prototype CNG fuel injector assembly was designed, which primarily included magnetostrictive material Terfenol-D as the actuator material, 1020 Steel having soft magnetic properties as the injector housing material, AWG copper wire as the coil material and 316 Stainless Steel having non-magnetic properties as the plunger material. A 2D cross-sectional geometry including the injector housing, coil, Terfenol-D shaft, and plunger, was modeled in ...
http://doras.dcu.ie/589/
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A Front Tracking Model for Transient Solidification of Al-7wt%Si in a Bridgman Furnace
(2012)
MOONEY, ROBIN
A Front Tracking Model for Transient Solidification of Al-7wt%Si in a Bridgman Furnace
(2012)
MOONEY, ROBIN
Abstract:
The Bridgman furnace is widely used in industry and research. This paper outlines a working onedimensional model for tracking the columnar solidification front in a Bridgman furnace where the pulling velocity, and hence front position, change as a function of time. The front tracking model is applied to a fixed grid of control volumes using an explicit numerical finite difference scheme to solve the heat equation over a finite domain. The model is demonstrated by way of a notional scenario, namely, Bridgman furnace solidification of a 16-mm diameter rod of Al?7wt%Si. The results show how the evolution of temperature distribution, thermal history, and front position are affected by a step change in pulling velocity.
http://hdl.handle.net/2262/76203
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A Front Tracking Model of the MAXUS-8 Microgravity Solidification Experiment on a Ti-45.5at.% Al-8at.%Nb Alloy
(2012)
Mooney, Robin; McFadden, Shaun; Rebow, Marek; Browne, David J
A Front Tracking Model of the MAXUS-8 Microgravity Solidification Experiment on a Ti-45.5at.% Al-8at.%Nb Alloy
(2012)
Mooney, Robin; McFadden, Shaun; Rebow, Marek; Browne, David J
Abstract:
On 26th March 2010 the MAXUS-8 sounding rocket was launched from the Esrange Space Center in Sweden. As part of the Intermetallic Materials Processing in Relation to Earth and Space Solidification (IMPRESS) project, a solidification experiment was conducted on a Ti-45.5at.%Al-8at.%Nb intermetallic alloy in a module on this rocket. The experiment was designed to investigate columnar and equiaxed microstructures in the alloy. A furnace model of the MAXUS 8 experiment with a Front Tracking Model of solidification has been developed to determine the macrostructure and thermal history of the samples in the experiment. This paper gives details of results of the front tracking model applied to the MAXUS 8 microgravity experiment. A model for columnar growth is presented and compared to experimental results for furnace A of the experiment module.
https://arrow.dit.ie/engmecdesignart/4
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A Heat Pump Assisted Shower
(1983)
McGovern, Jim
A Heat Pump Assisted Shower
(1983)
McGovern, Jim
Abstract:
An energy-efficient water-heating system for a shower is proposed consisting of a low-powered heat pump, a storage tank and an instantaneous heater which, it is felt, may yield a favourable overall cost, in addition to reducing the primary energy consumption. Some preliminary work has been carried out in exploring this concept. It was considered at the outset that an overall coefficient of performance (COP) of 2 should be readily achieved. Values close to this have been realised with the first experimental prototype.
https://arrow.dit.ie/engschmecart/3
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A new LED-LED portable CO2 gas sensor based on an interchangeable membrane system for industrial applications
(2011)
Vargas-Sansalvador, Isabel María Pérez de; Fay, Cormac; Phelan, Thomas; Fernández-Ramos...
A new LED-LED portable CO2 gas sensor based on an interchangeable membrane system for industrial applications
(2011)
Vargas-Sansalvador, Isabel María Pérez de; Fay, Cormac; Phelan, Thomas; Fernández-Ramos, M.D.; Capitán-Vallvey, Luis Fermin; Diamond, Dermot; Benito-Lopez, Fernando
Abstract:
A new system for CO2 measurement (0-100%) by based on a paired emitter-detector diode arrangement as a colorimetric detection system is described. Two different configurations were tested: configuration 1 (an opposite side configuration) where a secondary inner-filter effect accounts for CO2 sensitivity. This configuration involves the absorption of the phosphorescence emitted from a CO2-insensitive luminophore by an acid-base indicator and configuration 2 wherein the membrane containing the luminophore is removed, simplifying the sensing membrane that now only contains the acid-base indicator. In addition, two different instrumental configurations have been studied, using a paired emitter-detector diode system, consisting of two LEDs wherein one is used as the light source (emitter) and the other is used in reverse bias mode as the light detector. The first configuration uses a green LED as emitter and a red LED as detector, whereas in the second case two identical red LEDs are us...
http://doras.dcu.ie/16494/
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A novel constitutive law for describing materials behaviour at high strain rate and large deformation
(1995)
Hamouda, A. M. S
A novel constitutive law for describing materials behaviour at high strain rate and large deformation
(1995)
Hamouda, A. M. S
Abstract:
Determination of stress-strain properties of materials and formulation of suitable constitutive laws is very important in order that: (i) the elastic-plastic response and collapse mode of structures can be analysed for improving subsequent design, and (ii) analysis of high speed metal cutting and metal forming processes may provide improved estimations of process parameters and better understanding of material flow behaviour. Numerous techniques of high strain rate testing have been reported in the literature and most require transient measurements using sophisticated and often expensive instrumentation. The main criticism of these techniques is that there is always some inherent inaccuracy present especially when measurement of transient load is involved. In recent years, a new technique was reported in which high speed photographic means were employed. The technique avoids the measurement of transit load but is very tedious and expensive. This thesis is devoted to the developmen...
http://doras.dcu.ie/18826/
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A novel method for incorporation of micron-sized SiC particles into molten pure aluminum utilizing a Co coating
(2015)
Mohammadpour, M.; Azari Khosroshahi, Rasoul; Taherzadeh Mousavian, Reza; Brabazon, Dermot
A novel method for incorporation of micron-sized SiC particles into molten pure aluminum utilizing a Co coating
(2015)
Mohammadpour, M.; Azari Khosroshahi, Rasoul; Taherzadeh Mousavian, Reza; Brabazon, Dermot
Abstract:
Ceramic particles typically do not have sufficiently high wettability by molten metal for effective bonding during metal matrix composite fabrication. In this study, a novel method has been used to overcome this drawback. Micron-sized SiC particles were coated by a cobalt metallic layer using an electroless deposition method. A layer of cobalt on the SiC particles was produced prior to incorporation in molten pure aluminum in order to improve the injected particle bonding with the matrix. For comparison, magnesium was added to the melt in separate experiments as a wetting agent to assess which method was more effective for particle incorporation. It was found that both of these methods were more effective as regard ceramic particulate incorporation compared with samples produced with as-received SiC particles injected into the pure aluminum matrix. SEM images indicated that cobalt coating of the particles was more effective than magnesium for incorporation of fine SiC particles (bel...
http://doras.dcu.ie/21079/
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A novel technique for energy saving in freezing technology
(1993)
Zhang, Jianyi
A novel technique for energy saving in freezing technology
(1993)
Zhang, Jianyi
Abstract:
In the freezing process, a single evaporating temperature is normally used in the food industry. This work proposes a new technique which uses two evaporating temperatures in freezing process. Based on the Carnot principle, the bigger the temperature difference of refrigeration, the greater the energy costs. The new technique uses a higher evaporating temperature in the first period of the new freezing process. It allows most of the refrigeration capacity to be obtained for less temperature difference. Then the second period employs a lower evaporating temperature which makes the object further cooled to the final temperature required. In this way, the energy saving can be obtained by proper operations and adjustments to refrigerating plants. The parameters of the novel freezing technique are investigated and optimized using a personal computer. The simulation program is written in Quick Basic. Optimum parameters of the new process are studied for three refrigerants (R22, R502 and ...
http://doras.dcu.ie/19531/
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A Participatory Design Framework For Customisable Assistive Technology
(2015)
O'Rourke, Pearl
A Participatory Design Framework For Customisable Assistive Technology
(2015)
O'Rourke, Pearl
Abstract:
High product costs and device abandonment negatively affect people with disabilities who require Assistive Technology (AT), and poor product design is a root cause. The purpose of this research is to develop and demonstrate a participatory design framework for customisable AT, which addresses the need for low-cost assistive products that satisfy a broad range of consumers’ needs. This framework addresses two main gaps in the literature. First, user involvement in the design process of medical and rehabilitative products helps create products that are more effective but, although methods to involve users exist, there are currently scant techniques to translate the research data into design solution concepts. Second, adaptive mass customisation offers a way to reduce a product’s cost by making it useful to more people and adaptable to a user’s changing needs. Although the creation of one-off, tailored AT devices is discussed in the literature, there are no methods to support the devel...
https://arrow.dit.ie/engdoc/83
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A powered technique for inserting acetabular cups
(2012)
Naher, Sumsun; O'Callaghan, Daniel; Brabazon, Dermot
A powered technique for inserting acetabular cups
(2012)
Naher, Sumsun; O'Callaghan, Daniel; Brabazon, Dermot
Abstract:
This work focused to investigate the use of a powered automatic technique to insert acetabular cup implants. The use of a percussion hammer tool as a surgical instrument to insert acetabular cup implants was investigated in current work. Pull-out, lever-out and torque tests were carried out on cup implants inserted into test block specimens of polyurethane (PU) using specifically designed experimental setups as a means of comparing the current mallet and cup introducer (manual impaction) technique against the percussion hammer tool (powered impaction) technique. The experimental tests were based on calculating the maximum forces or moments of forces required to remove the cup implants from a test block specimen, which was representative of the acetabulum of the pelvic bone. It was found, the cup implants inserted using the powered impaction technique required a greater applied force, moment of force and torque in order to remove the cup from the cavity of the PU block specimen in th...
http://doras.dcu.ie/20493/
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A project-based-learning approach to teaching first-order and second-order differential equations to engineers
(2017)
Carr, M.; Farrell, Fionnuala; Ní Fhloinn, Eabhnat
A project-based-learning approach to teaching first-order and second-order differential equations to engineers
(2017)
Carr, M.; Farrell, Fionnuala; Ní Fhloinn, Eabhnat
http://doras.dcu.ie/22866/
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A sharp immersed boundary method based on penalisation and its application to moving boundaries and turbulent rotating flows
(2018)
Mathieu, Specklin; Yan, Delaure
A sharp immersed boundary method based on penalisation and its application to moving boundaries and turbulent rotating flows
(2018)
Mathieu, Specklin; Yan, Delaure
Abstract:
This paper presents an Immersed Boundary Method (IBM) for handling flows in the presence of fixed and moving solids with complex geometries. The method is based on a penalisation approach and designed to preserve the sharpness of the immersed boundaries. Corrections of the boundary conditions are implemented at the interface to improve the accuracy of the solution in comparison to first-order methods and avoid the rasterisation issue on Cartesian grids. The current IBM is developed in the OpenFOAM library (-v 2.2) and its accuracy is first verified against the Wannier flow case. It is then applied to the flow in presence of fixed and moving circular obstacles. The computational results show good agreement with equivalent standard body-conforming simulations and other high order published IBM, and demonstrate as well that improvements can be achieved by correcting the boundary conditions for both velocity and pressure on the interface. Finally, the method is assessed by reference to...
http://doras.dcu.ie/22262/
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A Simulation Analysis of Photovoltaic AC Module Integrated Converters in Parallel, under Controlled Edge Shading Conditions
(2012)
O'Callaghan, Lynette; McKeever, Michael; Norton, Brian
A Simulation Analysis of Photovoltaic AC Module Integrated Converters in Parallel, under Controlled Edge Shading Conditions
(2012)
O'Callaghan, Lynette; McKeever, Michael; Norton, Brian
Abstract:
A DC and AC power simulation comparison of: a Photovoltaic (PV) array with a modular, parallel, AC converter configuration; and a series, string configuration with a central AC converter, is presented. The systems are simulated using a comprehensive range of edge shading scenarios and irradiance conditions. Power control and transformation circuitry must be designed for shade and module mismatch tolerance to prevent over-proportional power to shade losses, as average losses from Building Integrated PV (BIPV) systems are approximately 20 to 25%, due to shade, mismatch, differences in orientation and inclination, and temperature effects. 59.4% of the simulations showed gains in AC power by using the parallel modular converter system, with a maximum gain of 10.74%, when compared with the series configuration. Losses up to 6.61% can be experienced when most of the modules are experiencing edge shading of 200 or 400W/m2, as i) the converter efficiency is lower in this power range for the...
https://arrow.dit.ie/engmecdesignconf/4
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