Search Results - "Ranmuthugala, Dev"

Influence of the L/D ratio on the rotary coefficients of a submarine by Kim, Howan, Ranmuthugala, Dev, Renilson, Martin

“…At the early design stage of a submarine, it is necessary to have a good estimate of the linear manoeuvring coefficients, or derivatives. These are necessary…”
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Downstream wake features of a Rood wing predicted by different turbulence models by Huong, Yieng Teen, Leong, Zhi Quan, Conway, Alexander, Duffy, Jonathan, Ranmuthugala, Dev

“…Computational fluid dynamics is used to analyze the influence of the horseshoe vortex on the wake features of a simplified geometry representing an underwater…”
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Experimental Study of a Modified Command Governor Adaptive Controller for Depth Control of an Unmanned Underwater Vehicle by Makavita, Charita D., Jayasinghe, Shantha G., Nguyen, Hung D., Ranmuthugala, Dev

“…Command governor–based adaptive control (CGAC) is a recent control strategy that has been explored as a possible candidate for the challenging task of precise…”
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Transforming learning with computers: Calculus for kids by Fluck, Andrew E., Ranmuthugala, Dev, Chin, C. K. H., Penesis, Irene, Chong, Jacky, Yang, Yang, Ghous, Asim

“…The Calculus for Kids project was deliberately designed to use computers in the transformation of curriculum. The intervention used multi-media learning…”
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Development and Control of a Low-Cost, Three-Thruster, Remotely Operated Underwater Vehicle by Le, Khoa Duy, Nguyen, Hung Duc, Ranmuthugala, Dev

“…This paper presents the development of a low cost Remotely Operated Vehicle (ROV) which consists of open source hardware and has three thrusters. First, the…”
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Determining the Horizontal and Vertical Water Velocity Components of a Turbulent Water Column Using the Motion Response of an Autonomous Underwater Vehicle by Randeni P., Supun, Forrest, Alexander, Cossu, Remo, Leong, Zhi, Ranmuthugala, Dev

“…This work introduces a new method to calculate the water velocity components of a turbulent water column in the x, y, and z directions using Autonomous…”
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Accuracy of Potential Flow Methods to Solve Real-time Ship-Tug Interaction Effects within Ship Handling Simulators by Jayarathne, B. Nirman, Ranmuthugala, Dev, Chai, Shuhong, Fei, Jiangang

“…The hydrodynamic interaction effects between two vessels that are significantly different in size operating in close proximity can adversely affect the safety…”
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Three-dimensional numerical simulations of straight-bladed vertical axis tidal turbines investigating power output, torque ripple and mounting forces by Marsh, Philip, Ranmuthugala, Dev, Penesis, Irene, Thomas, Giles

“…Three straight-bladed vertical axis turbine designs were simulated using Three-Dimensional (3D) transient Computational Fluid Dynamics (CFD) models, using a…”
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The influence of turbulence model and two and three-dimensional domain selection on the simulated performance characteristics of vertical axis tidal turbines by Marsh, Philip, Ranmuthugala, Dev, Penesis, Irene, Thomas, Giles

“…The influence of Computational Fluid Dynamics (CFD) modeling techniques on the accuracy of fixed pitch vertical axis turbine power output predictions was…”
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Numerical investigation of the influence of blade helicity on the performance characteristics of vertical axis tidal turbines by Marsh, Philip, Ranmuthugala, Dev, Penesis, Irene, Thomas, Giles

“…Previous research has shown that helical vertical axis turbines exhibit lower torque fluctuation levels than straight-bladed turbines; however little is known…”
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Six-DOF simulations of an underwater vehicle undergoing straight line and steady turning manoeuvres by Kim, Howan, Ranmuthugala, Dev, Leong, Zhi Quan, Chin, Christopher

“…This paper reports on numerical simulations conducted on an underwater vehicle for six-degrees of freedom (6-DOF) free running manoeuvres using Computational…”
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Experimental Study of Command Governor Adaptive Control for Unmanned Underwater Vehicles by Makavita, Charita Darshana, Jayasinghe, Shantha Gamini, Nguyen, Hung Duc, Ranmuthugala, Dev

“…The control of unmanned underwater vehicles (UUV) is a complex problem mainly due to the nonlinear dynamics, uncertainty in model parameters, and external…”
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Experimental drop test investigation into wetdeck slamming loads on a generic catamaran hullform by Swidan, Ahmed, Thomas, Giles, Ranmuthugala, Dev, Amin, Walid, Penesis, Irene, Allen, Tom, Battley, Mark

“…A series of drop-test experiments was performed to investigate the hydrodynamic loads experienced by a generic wave-piercer catamaran hullform during water…”
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Numerical simulation of the loading characteristics of straight and helical-bladed vertical axis tidal turbines by Marsh, Philip, Ranmuthugala, Dev, Penesis, Irene, Thomas, Giles

“…The stress and deflection of straight and helical-bladed vertical axis turbines was investigated using hydrodynamic and structural analysis models. Using…”
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Experimental Comparison of Two Composite MRAC Methods for UUV Operations With Low Adaptation Gains by Makavita, Charita Darshana, Jayasinghe, Shantha Gamini, Nguyen, Hung Duc, Ranmuthugala, Dev

“…In today's underwater environment, complex missions, such as underwater repair and docking operations, require precise control to maneuver unmanned underwater…”
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Quasi-static analysis of the hydrodynamic interaction effects on an autonomous underwater vehicle operating in proximity to a moving submarine by Leong, Zhi Quan, Ranmuthugala, Dev, Penesis, Irene, Nguyen, Hung

“…When an Autonomous Underwater Vehicle (AUV) operates close to a submarine, interaction with the flow and pressure fields of the submarine can adversely affect…”
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Experimental Study of a Command Governor Adaptive Depth Controller for an Unmanned Underwater Vehicle by Makavita, Charita D., Jayasinghe, Shantha G., Nguyen, Hung D., Ranmuthugala, Dev

“…Unmanned Underwater Vehicles (UUVs) are increasingly being used in advanced applications that require them to operate in tandem with human divers and around…”
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Authentic assessment in seafarer education: using literature review to investigate its validity and reliability through rubrics by Ghosh, Samrat, Bowles, Marcus, Ranmuthugala, Dev, Brooks, Ben

“…With the Standards of Training, Certification and Watchkeeping Convention 1995 (STCW’95) moving seafarer training towards outcome-based education (OBE),…”
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Improving the validity and reliability of authentic assessment in seafarer education and training: a conceptual and practical framework to enhance resulting assessment outcomes by Ghosh, Samrat, Bowles, Marcus, Ranmuthugala, Dev, Brooks, Ben

“…Past literature on authentic assessment suggests that it provides a far more reliable and valid indicator of outcomes such as higher student engagement,…”
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Wetdeck slamming loads on a developed catamaran hullform - experimental investigation by Swidan, Ahmed, Thomas, Giles, Penesis, Irene, Ranmuthugala, Dev, Amin, Walid, Allen, Tom, Battley, Mark

“…Catamaran wetdeck slamming has been experimentally investigated using a servo hydraulic slam testing system. A series of controlled-speed water impacts was…”
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