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Articles 1 - 23 of 23
Full-Text Articles in Engineering
Modelling Of Soft Ground Consolidation Via Combined Surcharge And Vacuum Preloading, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Ali Ghandeharioon
Modelling Of Soft Ground Consolidation Via Combined Surcharge And Vacuum Preloading, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Ali Ghandeharioon
Buddhima Indraratna
A system of vertical drains combined with vacuum and surcharge preloading is an effective approach for promoting radial flow to accelerate soil consolidation. When a higher load is required to meet the desired rate of settlement and the cost of surcharge is also significant, the application of vacuum pressure with reduced surcharge loading can be used. The equivalent 2-D plane strain solution for multi-drain analysis is described with the inclusion of the effects of vacuum pressure and smear zone caused by mandrel driven vertical drains. A large-scale radial consolidometer is employed to determine the extent of the smear zone and …
Modelling Of Combined Vacuum And Surcharge Preloading With Vertical Drains, Buddhima Indraratna, Cholackat Rujikiatkamjorn, Richard Kelly
Modelling Of Combined Vacuum And Surcharge Preloading With Vertical Drains, Buddhima Indraratna, Cholackat Rujikiatkamjorn, Richard Kelly
Cholachat Rujikiatkamjorn
In this study, 2D and 3D numerical analyses were conducted to predict embankment behaviour on soft clay foundations stabilised by Combined Vacuum and Surcharge Preloading. To determine the equivalent plane strain permeability, a revised conversion procedure for plane strain condition considering linear permeability variation in the smear zone is proposed. The equivalent permeability coefficients are then incorporated in finite element codes, employing the modified Cam-clay theory. The advantages and limitations of vacuum application through vertical drains are discussed through two selected case histories from China and Australia and the predictions are compared with the available field data. Apart from realistic …
Modelling Of Combined Vacuum And Surcharge Preloading With Vertical Drains, Buddhima Indraratna, Cholackat Rujikiatkamjorn, Richard Kelly
Modelling Of Combined Vacuum And Surcharge Preloading With Vertical Drains, Buddhima Indraratna, Cholackat Rujikiatkamjorn, Richard Kelly
Buddhima Indraratna
In this study, 2D and 3D numerical analyses were conducted to predict embankment behaviour on soft clay foundations stabilised by Combined Vacuum and Surcharge Preloading. To determine the equivalent plane strain permeability, a revised conversion procedure for plane strain condition considering linear permeability variation in the smear zone is proposed. The equivalent permeability coefficients are then incorporated in finite element codes, employing the modified Cam-clay theory. The advantages and limitations of vacuum application through vertical drains are discussed through two selected case histories from China and Australia and the predictions are compared with the available field data. Apart from realistic …
Modelling The Readout Performance Of A New Silicon Photodetector For Use In Pet, Michael Lerch, Philip Simmonds, Robert Ward, Tony Young, George Takacs, Anatoly Rosenfeld, V L Perevertaylo, Steven Meikle
Modelling The Readout Performance Of A New Silicon Photodetector For Use In Pet, Michael Lerch, Philip Simmonds, Robert Ward, Tony Young, George Takacs, Anatoly Rosenfeld, V L Perevertaylo, Steven Meikle
George Takacs
No abstract provided.
Geometric Modelling Of The Temporal Bone For Cochlea Implant Simulation, Catherine Todd, Fazel Naghdy, S. J. O'Leary
Geometric Modelling Of The Temporal Bone For Cochlea Implant Simulation, Catherine Todd, Fazel Naghdy, S. J. O'Leary
Professor Fazel Naghdy
The first stage in the development of a clinically valid surgical simulator for training otologic surgeons in performing cochlea implantation is presented. For this purpose, a geometric model of the temporal bone has been derived from a cadaver specimen using the biomedical image processing software package Analyze (AnalyzeDirect, Inc) and its three-dimensional reconstruction is examined. Simulator construction begins with registration and processing of a Computer Tomography (CT) medical image sequence. Important anatomical structures of the middle and inner ear are identified and segmented from each scan in a semi-automated threshold-based approach. Linear interpolation between image slices produces a three-dimensional volume …
Haptic Rendered Virtual Modelling Of Gear Assembly, Dong Shen, Fazel Naghdy
Haptic Rendered Virtual Modelling Of Gear Assembly, Dong Shen, Fazel Naghdy
Professor Fazel Naghdy
No abstract provided.
Symbolic Modelling Of Dynamic Human Motions, David Stirling, Amir Hesami, Christian Ritz, Kevin Adistambha, Fazel Naghdy
Symbolic Modelling Of Dynamic Human Motions, David Stirling, Amir Hesami, Christian Ritz, Kevin Adistambha, Fazel Naghdy
Professor Fazel Naghdy
Numerous psychological studies have shown that humans develop various stylistic patterns of motion behaviour, or dynamic signatures, which can be in general, or in some cases uniquely, associated with an individual. In a broad sense, such motion features provide a basis for non-verbal communication, or body language, and in more specific circumstances they combine to form a Dynamic Finger Print (DFP) of an individual, such as their gait, or walking pattern. A new modelling and classification approach for spatiotemporal human motions is proposed, and in particular the walking gait. The movements are obtained through a full body inertial motion capture …
Testing, Modelling And Validation Of Numerical Model Capable Of Predicting Stress Fields Throughout Polyurethane Foam, Conor Briody, Barry Duignan, Stephen Jerrams
Testing, Modelling And Validation Of Numerical Model Capable Of Predicting Stress Fields Throughout Polyurethane Foam, Conor Briody, Barry Duignan, Stephen Jerrams
Conference Papers
Wheelchair seating systems are specialised for a number of reasons as users can have impaired mobility, which increases the possibility of pressure build up. These areas of high pressure frequently occur in the trunk region under the bony prominences known as the Ischial Tuberosities (IT), pressure ulcers may occur consequently. Polyurethane foam has been in use for some time in wheelchair seating systems as it exhibits good pressure relieving capabilities in most cases. However, little quantitative research has gone into foamed polymers, in comparison with conventional elastomeric materials. This lack of knowledge can ultimately lead to more time being spent …
Characterisation, Modelling And Simulation Of Flexible Polyurethane Foam, Conor Briody, Barry Duignan, Stephen Jerrams
Characterisation, Modelling And Simulation Of Flexible Polyurethane Foam, Conor Briody, Barry Duignan, Stephen Jerrams
Conference Papers
Flexible polyurethane foam is an open-celled polymeric material that exhibits strain rate and temperature effects. It has found various applications in areas including the packaging, medical, sports, aerospace and aeronautical industries. Polyurethane foam is ubiquitous in seating applications and finds particular use in specialised wheelchair seating where customised seating solutions are required which can provide proper comfort and support without the risk of developing pressure ulcers. Proper seating design is critical for users if this problem is to be avoided, but a lack of quantitative knowledge of this material’s behaviour has limited its effectiveness. The objectives of the work presented …
Applications Of A 3-D Cfb Model On Oxycombustion, Gasification And Calcinator In Calcium Looping, Kari Myöhänen, Timo Hyppänen, Markku Nikku, Matti Koski, Jarno Parkkinen
Applications Of A 3-D Cfb Model On Oxycombustion, Gasification And Calcinator In Calcium Looping, Kari Myöhänen, Timo Hyppänen, Markku Nikku, Matti Koski, Jarno Parkkinen
Kari Myöhänen
No abstract provided.
Influence Of Temperature On The Gas Content Of Coal And Sorption Modelling, Lei Zhang, Najdat I. Aziz, Ting Ren, Zhongwei Wang
Influence Of Temperature On The Gas Content Of Coal And Sorption Modelling, Lei Zhang, Najdat I. Aziz, Ting Ren, Zhongwei Wang
Faculty of Engineering - Papers (Archive)
n experimental study was undertaken to examine the sorption and desorption characteristics of coal at temperatures of 35 °C, 45 °C and 55 °C. The study focused on the effect of changes in temperature and coal particle sizes on gas sorption and desorption characteristics. The coal size used ranged from fragmented coals, 16 mm, 8 mm, 2.4 mm, powdered coal of 150 μm and 54 mm core samples. The samples were tested in pressure vessels, known as bombs, and charged with CO2 gas at different pressure levels up to a maximum of 4000 kPa. It was found that temperature was …
Modelling Net Zero Energy Options For A Sustainable Buildings Research Centre, Paul Cooper, Xiong Liu, Prabuono Buyung Kosasih, Rui Yan
Modelling Net Zero Energy Options For A Sustainable Buildings Research Centre, Paul Cooper, Xiong Liu, Prabuono Buyung Kosasih, Rui Yan
Faculty of Engineering - Papers (Archive)
This paper describes the preliminary design and energy analysis of a university research building in NSW, Australia. This case study highlights some of the challenges confronting those wishing to design cost-effective net zero energy buildings in the Australian higher education sector and beyond. The Sustainable Buildings Research Centre (SBRC) is presently under development at the University of Wollongong and will be a unique building in the local region and an exemplar in respect of demonstration of a range of technical and operational means of reducing greenhouse emissions and other ecological impacts. This paper provides details on the constraints and opportunities …
The Beginning Of A New Era In Design: Calibrated Discrete Element Modelling, Andrew Grima, David Hastie, David Curry, Peter Wypych, Richard La Roche
The Beginning Of A New Era In Design: Calibrated Discrete Element Modelling, Andrew Grima, David Hastie, David Curry, Peter Wypych, Richard La Roche
Faculty of Engineering and Information Sciences - Papers: Part A
The reliable storage and flow of bulk materials requires a comprehensive design process and good understanding of the flow properties of a bulk material. Analytical and empirical design techniques form the backbone of many design processes as they have been validated by research, however, theories based on continuum mechanics have many shortcomings and are restricted to 2-D analysis. Discrete element modelling (DEM) is proving to be a popular analysis and simulation method to verify designs for a wide range of bulk material processing and handling operations, such as transfer chutes. With the advances in computing and DEM technology, DEM has …
Discrete Element Modelling: Trouble-Shooting And Optimisation Tool For Chute Design, Andrew P. Grima, Thomas Fraser, David B. Hastie, Peter W. Wypych
Discrete Element Modelling: Trouble-Shooting And Optimisation Tool For Chute Design, Andrew P. Grima, Thomas Fraser, David B. Hastie, Peter W. Wypych
Faculty of Engineering and Information Sciences - Papers: Part A
Conveyor transfer stations play a key role in many industries that handle bulk materials. Transfer stations can be rather sensitive to changes in material properties and can lead to relentless problems regarding reliability, wear, bottlenecking and blockages. Wet and sticky ores are typically difficult to handle materials due to their obnoxious ability to form a cohesive arch, adhere to surfaces and poor flow ability. Mines that are situated in areas with seasonal high rainfalls or that have started to exploit newer and more difficult to mine and handle ores, often from below the water table, experience vast difficulty in reliably …
Implications Of Ballast Breakage On Ballasted Railway Track Based On Numerical Modelling, Buddhima Indraratna, S Nimbalkar
Implications Of Ballast Breakage On Ballasted Railway Track Based On Numerical Modelling, Buddhima Indraratna, S Nimbalkar
Faculty of Engineering - Papers (Archive)
Large and frequent cyclic train loading from heavy haul and passenger trains often leads to progressive track deterioration. The excessive deformation and degradation of ballast and unacceptable differential settlement of track and/or pumping of underlying soft subgrade soils necessitate frequent and costly track maintenance. A proper understanding of load transfer mechanisms and subsequent deformations in track layers is the key element for safe and economical track design and optimum maintenance procedures. Many simplifi ed analytical and empirical design methods have been used to estimate the settlement and stress-transfer between the track layers. However, these design methods are based on the …
Consolidation By Vertical Drain Beneath A Circular Embankment Using Analytical And Numerical Modelling, Cholachat Rujikiatkamjorn, Buddhima Indraratna, A Aljorany
Consolidation By Vertical Drain Beneath A Circular Embankment Using Analytical And Numerical Modelling, Cholachat Rujikiatkamjorn, Buddhima Indraratna, A Aljorany
Faculty of Engineering - Papers (Archive)
When prefabricated vertical drains (PVDs) are installed beneath circular embankment (i.e. circular oil tanks or silos), the system of vertical drains can be replaced by axisymmetric concentric rings with equivalent drain walls. A value for the equivalent coeffi cient of soil permeability must be obtained to provide the same degree of consolidation. A rigorous solution for PVDs installed under circular embankment is proposed and verifi ed by comparing its results with conventional unit cell model. The model is then validated via the consolidation process by vertical drains at the Skå-Edeby circular test embankment (Area II). The calculated values of settlement, …
Modelling And Performance Enhancement Of A Linear Actuation Mechanism Using Conducting Polymers, Elise T. Burriss, Gursel Alici, Geoffrey M. Spinks, Scott Mcgovern
Modelling And Performance Enhancement Of A Linear Actuation Mechanism Using Conducting Polymers, Elise T. Burriss, Gursel Alici, Geoffrey M. Spinks, Scott Mcgovern
Faculty of Engineering - Papers (Archive)
In this paper, we report on our investigation into modelling and performance enhancement of a linear actuation system based on cantileveredtype conducting polymer actuators, which can operate in air and aqueous media. We have employed the model to predict the linear displacement and force output of the actuation system, and to determine the optimum values of the system design parameters. The linear actuation system is a five bar parallel mechanism, articulated with two polymer actuators. Kinematic and force analyses of the mechanism including numerical results are presented, and its payload handling ability was experimentally evaluated. The experimental results prove that …
Development And Validation Of Calibration Methods For Discrete Element Modelling, Andrew Grima, Peter W. Wypych
Development And Validation Of Calibration Methods For Discrete Element Modelling, Andrew Grima, Peter W. Wypych
Faculty of Engineering - Papers (Archive)
Discrete element method (DEM) is proving to be a reliable and increasingly used tool to study and predict the behaviour of granular materials. Numerous particlescale mechanisms influence the bulk behaviour and flow of bulk materials. It is important that the relevant measurable input parameters for discrete element models bemeasured by laboratory equipment or determined by physical calibration experiments for rational results. This paper describes some of the bench-scale experiments that have been developed to calibrate the DEM simulations to reflect actual dynamic behaviour. Relevant parameters such as static and rolling coefficients of friction, coefficient of restitution and interparticle cohesion forces …
Use Of Embedded Pile Elements In 3d Modelling Of Piled-Raft Foundations, David Oliveira, Patrick K. Wong
Use Of Embedded Pile Elements In 3d Modelling Of Piled-Raft Foundations, David Oliveira, Patrick K. Wong
Faculty of Engineering - Papers (Archive)
The use of embedded pile elements provides a convenient approach that may save significant modelling time in the simulation of piled foundations. A back-analysis of an Osterberg-cell (O-Cell) load test on a 45 m long pile is presented to illustrate some of the advantages of using structural embedded elements. Comparisons with other modelling approaches for piled-raft foundations have showed good agreement. Three dimensional effects on shaft friction were also investigated in this paper. The simplified example indicates that, although the ultimate shaft friction developed along piles within a piled raft can be significantly greater than that for a single pile …
Developments In The Modelling Of Oxygen Steelmaking, G A. Brooks, N Dogan, M Alam, J Naser, M A. Rhamdhani
Developments In The Modelling Of Oxygen Steelmaking, G A. Brooks, N Dogan, M Alam, J Naser, M A. Rhamdhani
Faculty of Engineering - Papers (Archive)
Steelmaking is a complex process involving simultaneous multi-phase interactions, chemical reactions, heat transfer and turbulent flow patterns at high temperatures. The severe operating conditions make it difficult to make measurements and directly observe the process. Mathematical modelling has been widely used to evaluate the process and improve understanding of the system and optimise process control. Three approaches to modelling the process, equilibrium modelling to predict the equilibrium chemistry of the process, kinetic modelling to analyse rate of chemical changes throughout the process, and computational fluid modelling to understand the fluid flow in the reactor, are discussed in this paper. The …
Crystal Plasticity Finite Element Modelling Of Surface Roughness And Texture Of Metals, H Li, Z Jiang, D Wei, J Han
Crystal Plasticity Finite Element Modelling Of Surface Roughness And Texture Of Metals, H Li, Z Jiang, D Wei, J Han
Faculty of Engineering - Papers (Archive)
A crystal plasticity finite element method (CPFEM) model was developed to analyse the surface roughness transfer and texture of metals during metal forming. In order to investigate the crystal slip mechanism and influence of different polycrystalline models (Taylor-type model and finite element polycrystalline model) on finite element modelling, the uniaxial compression of FCC pure aluminum was carried out in laboratory, and the Taylor-type and finite element polyaystalline models are separately employed in the finite element software ABAQUS to simulate the development of the deformation texture by rate dependent crystal constitutive equations during three different deformation modes (free compression, uniaxial planar …
Design Of Modular Fixtures Using A 3d-Modelling Approach, U Farhan, M Tolouei-Rad
Design Of Modular Fixtures Using A 3d-Modelling Approach, U Farhan, M Tolouei-Rad
Research outputs 2011
The need for improved productivity and reduced time to market has been increased significantly in manufacturing processes in recent decades. There are many factors that play a role in providing manufacturing processes with more productivity. One is the use of modular fixtures (MFs). MFs have brought many benefits to manufacturing industries including reduced costs and times of production. An MF can be defined as a complete system that consist different elements for effectively and securely holding the workpiece in place for performing various machining operations. Generally an MF is made by assembling a number of fixture elements in a feasible …
Modelling Small-Scale Stand-Alone (Pv) Energy Systems With Reverse Osmosis Integration, Daniel Clarke, Yasir Al-Abdeli, Ganesh Kothapalli
Modelling Small-Scale Stand-Alone (Pv) Energy Systems With Reverse Osmosis Integration, Daniel Clarke, Yasir Al-Abdeli, Ganesh Kothapalli
Research outputs 2011
Australia has a vast land mass characterised by more than 35,000km of shore-line and an abundance of renewable sources (e.g., solar and wind en ergy). Despite the existence of much potential to utilise sustainable pathways of power generation, ther e remains a general reliance on electricity generated from larger plants which are mostly grid-connected but fossil-fuel operated. In Western Australia, only a fraction of its coastal areas and inland mass is serviced by the South West Interconnected (grid) System. For the majority of its regional commun ities, decentralised power generati on forms the prime source of power provision. This exacerbates …