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Splitter-Plate Wake Stabilisation And Low Aspect Ratio Cylinder Flow-Induced Vibration Mitigation, Brad Stappenbelt 2010 University of Wollongong

Splitter-Plate Wake Stabilisation And Low Aspect Ratio Cylinder Flow-Induced Vibration Mitigation, Brad Stappenbelt

Faculty of Engineering - Papers (Archive)

This paper investigates the proposed utility of splitter-plate wake stabilisation as a passive control mechanism for vortexinduced vibration (VIV) mitigation for low aspect ratio cylinders. Stationary cylinder experiments have repeatedly demonstrated the effectiveness of splitter plates in reducing lift and drag coefficients for a cylinder in uniform flow. Rigid attached splitter plates have been shown to be capable of completely eliminating vortex shedding in fixed cylinder investigations. In the limited number of studies that have examined the use of splitter plates in a system which is free to vibrate in the direction transverse to the flow, a galloping-type response has ...


Flow-Induced Vibration Mitigation Using Attached Splitter-Plates, B. Stappenbelt 2010 University of Wollongong

Flow-Induced Vibration Mitigation Using Attached Splitter-Plates, B. Stappenbelt

Faculty of Engineering - Papers (Archive)

Prior stationary cylinder studies have continually demonstrated the effectiveness of attached splitter-plates in reducing drag and lift coefficients of cylinders in steady uniform flow. The use of attached splitter-plates has even been reported to be able to completely eliminate vortex shedding in fixed cylinder investigations. In the present study, the proposed utility of attached splitter-plate wake-stabilisation as a passive control mechanism for vortex-induced vibration (VIV) mitigation was investigated. A range of splitter-plate ratios from I/D=O to 4 were examined over a reduced velocity interval of Ur=3 to 60. The addition of splitter-plates resulted in the desired effect ...


Periodic And Continuous Landslide Monitoring To Assess Landslide Frequency – Selected Australian Examples, P. Flentje, R. Chowdhury, Anthony Miner, C. Mazengarb 2010 University of Wollongong

Periodic And Continuous Landslide Monitoring To Assess Landslide Frequency – Selected Australian Examples, P. Flentje, R. Chowdhury, Anthony Miner, C. Mazengarb

Faculty of Engineering - Papers (Archive)

Landslide frequency is one of the major challenges that must be managed when undertaking a landslide risk assessment. Important issues to be considered when assessing landslide frequency include recognition of the landslide types and processes, landslide volume and magnitudes of displacement. Landslide frequency assessments must also recognize anthropogenic factors (in place and or proposed) such as any remedial measures (subsurface drainage and or retaining structures) as such works will be designed to have significant effects in reducing the frequency of landsliding at any site. Periodic and or continuous monitoring will certainly be of benefit in such assessments, but will only ...


Geotechnical Analysis Of Slopes And Landslides: Achievements And Challenges, R. Chowdhury, P. Flentje 2010 University of Wollongong

Geotechnical Analysis Of Slopes And Landslides: Achievements And Challenges, R. Chowdhury, P. Flentje

Faculty of Engineering - Papers (Archive)

PRIMARY OBJECTIVES

Design Safe Slopes, Understand Performance of Slopes and Earth Dams, Quantify Landslide Susceptibility, Hazard and Risk, Landslide Risk Management, Reduction of Disaster Risk

ESSENTAIL INFORMATION

REGIONAL---Geology, Topography, Urbanisation, Landslide History, Triggering Factors(Rainfall ,Earthquakes etc)

SITE-SPECIFIC----Soil and Rock Types, Discontinuities ,Pore Water Pressures, Shear Strength Parameters, Unsaturated Zones, Observed Slope Movements, Quality of Data

IMPORTANT STEPS

Identify Failure Mechanisms, Develop Geotechnical Models, Parameter Variability, Systematic Uncertainties, Assess Stability/Reliability/Hazard /Risk, Validate with Respect to Observed Data


A Comparative Study Of Various Data Mining Techniques As Applied To The Modeling Of Landslide Susceptibility On The Bellarine Peninsula, Victoria, Australia, Anthony Miner, P. Vamplew, D. J. Windle, P. Flentje, P. Warner 2010 University of Ballarat

A Comparative Study Of Various Data Mining Techniques As Applied To The Modeling Of Landslide Susceptibility On The Bellarine Peninsula, Victoria, Australia, Anthony Miner, P. Vamplew, D. J. Windle, P. Flentje, P. Warner

Faculty of Engineering - Papers (Archive)

Numerous techniques exist for modeling landslide susceptibility including heuristic, statistical and deterministic analyses. More recently, knowledge-based techniques have been explored including data mining approaches whereby key data sets are assessed to establish inter-relationships with the primary training set, in our case, landslides. This paper analyses a study area of approximately 800 km2 on the Bellarine Peninsula in Victoria, Australia where landslides are restricted mainly to the coastal fringes and as such, form a ‘rare data set’ for the overall region. This paucity of training data presents problems for traditional susceptibility methods and, as a result, a series of trials using ...


Designing A Landslide Database; Lessons From Australian Examples, C. Mazengarb, P. Flentje, Anthony Miner, M. Osuchowski 2010 Mineral Resources Tasmania

Designing A Landslide Database; Lessons From Australian Examples, C. Mazengarb, P. Flentje, Anthony Miner, M. Osuchowski

Faculty of Engineering - Papers (Archive)

The Australian Geomechanics Society 2007 Landslide Risk Management Guidelines stress the importance of developing inventories of landslides in order to underpin better land management decisions and facilitate landslide research . In the absence of a definitive (and published) data model for the inventory a number of landslide databases have been created in Australia to serve a range of purposes, all of which pre-date the guidelines. We outline a project undertaken to develop a website linking four disparate landslide databases together using network service oriented interoperability concepts and technology. From this project we have learned a number of important lessons. Digital landslide ...


A Polynomial Chaos-Based Kalman Filter Approach For Parameter Estimation Of Mechanical Systems, Emmanuel D. Blanchard, Corina Sandu, Adrian Sandu 2010 Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA

A Polynomial Chaos-Based Kalman Filter Approach For Parameter Estimation Of Mechanical Systems, Emmanuel D. Blanchard, Corina Sandu, Adrian Sandu

Faculty of Engineering - Papers (Archive)

Mechanical systems operate under parametric and external excitation uncertainties. The polynomial chaos approach has been shown to be more efficient than Monte Carlo for quantifying the effects of such uncertainties on the system response. Many uncertain parameters cannot be measured accurately, especially in real time applications. Information about them is obtained via parameter estimation techniques. Parameter estimation for large systems is a difficult problem, and the solution approaches are computationally expensive. This paper proposes a new computational approach for parameter estimation based on the extended Kalman filter (EKF) and the polynomial chaos theory for parameter estimation. The error covariances needed ...


Adding Value To Physics Laboratories For Pre-Service Teachers, Lorna Jarrett, George J. Takacs, Brian Ferry 2010 University of Wollongong

Adding Value To Physics Laboratories For Pre-Service Teachers, Lorna Jarrett, George J. Takacs, Brian Ferry

Faculty of Engineering - Papers (Archive)

This project focussed on first-year physics laboratories for pre-service teachers. It aimed to make laboratories more aligned to future teachers’ needs; contributing to their confidence with apparatus, conceptual understanding and effectiveness as communicators. However, our approach is also relevant to mainstream science laboratories. First, we flagged links with practical investigations in the NSW High School year 11 / 12 physics syllabus in the lab manual. Second, we incorporated qualitative multiple-choice questions at strategic points based on the Peer Instruction work of Mazur (1996), Crouch and Mazur (2001) and Cox and Junkin III (2002). Finally we employed principles of Cognitive Load Theory ...


Development Of A Comprehensive Model For Oxygen Steelmaking, Neslihan Dogan, Geoffrey A. Brooks, Muhammad A. Rhamdhani 2010 University of Wollongong

Development Of A Comprehensive Model For Oxygen Steelmaking, Neslihan Dogan, Geoffrey A. Brooks, Muhammad A. Rhamdhani

Faculty of Engineering - Papers (Archive)

One of the main goals in oxygen steelmaking process is to reduce the carbon concentration of the liquid iron effectively. It is understood that the majority of the carbon removal reaction occurs in the emulsion phase via the reaction between metal droplets and the slag phase. An improved understanding of this reaction and the factors controlling the overall rate should provide better control of the process and increase the productivity. In the literature, there is limited knowledge on how to relate the carbon removal rate within the droplets to the overall kinetics of the process under full scale operating conditions ...


Kinetics Of Decarburization Reaction In Oxygen Steelmaking Process, Neslihan Dogan, Geoffrey A. Brooks, Muhammad A. Rhamdhani 2010 University of Wollongong

Kinetics Of Decarburization Reaction In Oxygen Steelmaking Process, Neslihan Dogan, Geoffrey A. Brooks, Muhammad A. Rhamdhani

Faculty of Engineering - Papers (Archive)

The steelmaking process is complex since it involves simultaneous multi-phase (solidgas- liquid) interactions, chemical reactions, heat and mass transfer and complex flow patterns at high temperatures. The transient nature of the process also adds more complexities and the severe operating conditions inhibit the direct measurement and observation of the process. This difficulty can be addressed by developing models, which make it possible to describe the complicated nature of the process itself and to understand the interconnection of important process variables. A global model of oxygen steelmaking focusing on the overall decarburization of the process and including the new bloated droplet ...


Turbulent Drag Reduction With Polymer Additive In Rough Pipes, Shuqing Yang, G Dou 2010 University of Wollongong

Turbulent Drag Reduction With Polymer Additive In Rough Pipes, Shuqing Yang, G Dou

Faculty of Engineering - Papers (Archive)

Friction factor of drag-reducing flow with presence of polymers in a rough pipe has been investigated based on the eddy diffusivity model, which shows that the ratio of effective viscosity caused by polymers to kinematic viscosity of fluid should be proportional to the Reynolds number, i.e. uR/ν and the proportionality factor depends on polymer's type and concentration. A formula of flow resistance covering all regions from laminar, transitional and fully turbulent flows has been derived, and it is valid in hydraulically smooth, transitional and fully rough regimes. This new formula has been tested against Nikuradse and ...


Flux Pinning And Inhomogeneity In Magnetic Nanoparticle Doped Mgb2/Fe Wires, Nikolina Novosel, Damir Pajic, Mislav Mustapic, Emil Babic, Andrey Shcherbakov, Josip Horvat, Zeljko Skoko, Kreso Zadro 2010 University of Zagreb

Flux Pinning And Inhomogeneity In Magnetic Nanoparticle Doped Mgb2/Fe Wires, Nikolina Novosel, Damir Pajic, Mislav Mustapic, Emil Babic, Andrey Shcherbakov, Josip Horvat, Zeljko Skoko, Kreso Zadro

Faculty of Engineering - Papers (Archive)

The effects of magnetic nanoparticle doping on superconductivity of MgB2/Fe wires have been investigated. Fe2B and SiO2-coated Fe2B particles with average diameters 80 and 150 nm, respectively, were used as dopands. MgB2 wires with different nanoparticle contents (0, 3, 7.5, 12 wt.%) were sintered at temperature 750°C. The magnetoresistivity and critical current density Jc of wires were measured in the temperature range 2–40 K in magnetic field B ≤ 16 T. Both transport and magnetic Jc were determined. Superconducting transition temperature Tc of doped wires decreases quite ...


Pressure Fluctuation Around Chute Blocks Of Saf Stilling Basins, Javad Farhoudi, S M. Sadat-Helbar, Najdat I. Aziz 2010 Dept of Irrigation Engineering Uni of Tehran

Pressure Fluctuation Around Chute Blocks Of Saf Stilling Basins, Javad Farhoudi, S M. Sadat-Helbar, Najdat I. Aziz

Faculty of Engineering - Papers (Archive)

Geometry of the chute blocks in stilling basins plays a significant role in size and type of these structures. One of the most influencing factors in the design of the blocks is the fluctuating pressure which may cause fatigue on the blocks. Despite investigations conducted by many researchers, there is not enough information about the pressure fluctuation around chute blocks in compacted stilling basins such as Saint Anthony Falls (SAF) basins. In this paper, the results of a naval experimental work and measurement of pressure fluctuations around chute blocks of SAF stilling basins are reported. The results show that the ...


Anisotrophic Currents And Flux Jumps In High-Tc Superconducting Films With Self-Organized Arrays Of Planar Defects, V Yurchenko, A.J Qviller, P.B Mozhaeva, J.E Mozhaeva, J.B Hansen, C Jacobsen, I.M Kotelyanskii, Alexey V. Pan, T H. Johansen 2010 University of Oslo

Anisotrophic Currents And Flux Jumps In High-Tc Superconducting Films With Self-Organized Arrays Of Planar Defects, V Yurchenko, A.J Qviller, P.B Mozhaeva, J.E Mozhaeva, J.B Hansen, C Jacobsen, I.M Kotelyanskii, Alexey V. Pan, T H. Johansen

Faculty of Engineering - Papers (Archive)

Regular arrays of planar defects with a period of a few nanometers can be introduced in superconducting YBa2Cu3O7-δ (YBCO) thin films by depositing them on vicinal (also called miscut or tilted) substrates. This results in the anisotropy of critical currents flowing in the plane of the film. We present results of real-time magneto-optical imaging (MOI) of magnetic flux distribution and dynamics in a series of YBCO thin films deposited on NdGaO3 substrates with different miscut angles θ. MOI allows reconstructing the current flow profiles. From the angle formed between domains with different directions ...


Characterization Of The Bake-Hardening Behavior Of Transformation Induced Plasticity And Dual-Phase Steels Using Advanced Analytical Techniques, Ilana Timokhina, E V. Pereloma, S P. Ringer, Rongkun Zheng, Peter D. Hodgson 2010 Deakin University

Characterization Of The Bake-Hardening Behavior Of Transformation Induced Plasticity And Dual-Phase Steels Using Advanced Analytical Techniques, Ilana Timokhina, E V. Pereloma, S P. Ringer, Rongkun Zheng, Peter D. Hodgson

Faculty of Engineering - Papers (Archive)

The bake-hardening (BH) behavior of TRansformation Induced Plasticity (TRIP) and Dual-Phase (DP) steels after intercritical annealing (IA) has been studied using transmission electron microscopy, X-ray diffraction and three dimensional atom probe tomography. It was found for the DP steel that carbon can segregate to dislocations in the ferrite plastic deformation zones where there is a high dislocation density around the “as-quenched” martensite. The carbon pinning of these dislocations, in turn, increases the yield strength after aging. It was shown that bake-hardening also leads to rearrangement of carbon in the martensite leading to the formation of rod-like low temperature carbides in ...


Coupling Interaction Of Electromagnetic Wave In A Groove Doublet Configuration, Lan Ding, Jinsong Liu, Kejia Wang, Dong Wang 2010 University of Wollongong

Coupling Interaction Of Electromagnetic Wave In A Groove Doublet Configuration, Lan Ding, Jinsong Liu, Kejia Wang, Dong Wang

Faculty of Engineering - Papers (Archive)

Based on the waveguide mode (WGM) method, coupling interaction of electromagnetic wave in a groove doublet configuration is studied. The formulation obtained by WGM method for a single groove [Prog. Electromagn. Res. 18, 1–17 (1998)] is extended to two grooves. By exploring the total scattered field of the configuration, coupling interaction ratios are defined to describe the interaction between grooves quantitatively. Since each groove in this groove doublet configuration is regarded as the basic unit, the effects of coupling interaction on the scattered fields of each groove can be investigated respectively. Numerical results show that an oscillatory behavior of ...


The Ventilated Filling Box Containing A Vertically Distributed Source Of Buoyancy, Paul Cooper, Gary R Hunt 2010 University of Wollongong

The Ventilated Filling Box Containing A Vertically Distributed Source Of Buoyancy, Paul Cooper, Gary R Hunt

Faculty of Engineering - Papers (Archive)

This paper describes the fluid mechanics within a box containing a vertical, plane, distributed source of buoyancy. A theoretical analysis is presented that models the development of plumes from such sources in an unconfined ambient that is of uniform density. Two extensions are considered. The first concerns a sealed box and the second involves the more general situation where the box is ventilated by openings at top and bottom. In the sealed box the stratification develops in much the same way as for a `filling-box' containing a single, point source of buoyancy on the floor. An initial front descends from ...


Correlation Of Nanoindentation-Induced Deformation Microstructures In Diamondlike Carbon Coatings On Silicon Substrates With Simulation Studies, Ayesha J. Haq, Paul G. Munroe, Mark Hoffman, Phil J. Martin, Avi Bendavid 2010 University of Wollongong

Correlation Of Nanoindentation-Induced Deformation Microstructures In Diamondlike Carbon Coatings On Silicon Substrates With Simulation Studies, Ayesha J. Haq, Paul G. Munroe, Mark Hoffman, Phil J. Martin, Avi Bendavid

Faculty of Engineering - Papers (Archive)

The effect of the presence of diamondlike carbon coatings deposited on (100) Si substrateson the deformation mechanisms operating in the silicon substrate during contact loadinghave been investigated by both cross-sectional transmission electron microscopy andmodeling of the stresses generated beneath the indenter tip. The observed subsurfacemicrostructures were correlated to the Tresca shear stress and the hydrostatic stressgenerated in the silicon substrate beneath the indenter tip. The presence of the coatingaltered the stresses generated in the substrate, and changed the deformation mechanismfrom one of principally phase transformation in uncoated Si to predominantly dislocationmotion in the silicon substrate for the diamondlike C¿Si ...


Silicon/Single-Walled Carbon Nanotube Composite Paper As A Flexible Anode Material For Lithium Ion Batteries, Shulei Chou, Yue Zhao, Jiazhao Wang, Zhixin Chen, Hua-Kun Liu, S. X. Dou 2010 University of Wollongong

Silicon/Single-Walled Carbon Nanotube Composite Paper As A Flexible Anode Material For Lithium Ion Batteries, Shulei Chou, Yue Zhao, Jiazhao Wang, Zhixin Chen, Hua-Kun Liu, S. X. Dou

Faculty of Engineering - Papers (Archive)

Flexible silicon/single-walled carbon nanotube (Si/SWCNT) composite paper was prepared using the pulsed laser deposition (PLD) method to deposit Si onto SWCNT paper. In the composite, Si mainly shows nanoworm-like morphology. Increasing deposition time results in an increased amount of Si microspheres. Electrochemical measurements show that the capacity of the composite paper is improved by the presence of Si. The Si/SWCNT composite with only 2.2% Si shows a capacity of 163 mA h g−1 at a current density of 25 mA g−1 up to 50 cycles, which is more than 60% improvement of the capacity ...


Sno2-Nio-C Nanocomposite As A High Capacity Anode Material For Lithium-Ion Batteries, Mohd Faiz Hassan, Md Mokhlesur Rahman, Zaiping Guo, Zhixin Chen, Hua-Kun Liu 2010 University of Wollongong

Sno2-Nio-C Nanocomposite As A High Capacity Anode Material For Lithium-Ion Batteries, Mohd Faiz Hassan, Md Mokhlesur Rahman, Zaiping Guo, Zhixin Chen, Hua-Kun Liu

Faculty of Engineering - Papers (Archive)

Carbon-coated SnO2–NiO nanocomposite was successfully synthesized via the molten salt route, using SnCl2·H2O and NiCl2·6H2O as the starting materials, with a molten salt composition of H2O2:LiOH·H2O:LiNO3 as a solvent at 300 °C. The synthesis was followed by a carbon layering process. The phases and morphology of the as-prepared samples were examined by X-ray diffraction and transmission electron microscopy. Electrochemical investigation was carried out by using a series of complementary techniques, including galvanostatic charge–discharge, cyclic voltammetry, and impedance spectroscopy. The results ...


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