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Dive into the research topics where Desmond Robinson is active.

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Featured researches published by Desmond Robinson.


IEEE Transactions on Visualization and Computer Graphics | 1996

Shape description by medial surface construction

Damian J. Sheehy; Cecil Armstrong; Desmond Robinson

The medial surface is a skeletal abstraction of a solid that provides useful shape information, which compliments existing model representation schemes. The medial surface and its associated topological entities are defined, and an algorithm for computing the medial surface of a large class of B-rep solids is then presented. The algorithm is based on the domain Delaunay triangulation of a relatively sparse distribution of points, which are generated on the boundary of the object. This strategy is adaptive in that the boundary point set is refined to guarantee a correct topological representation of the medial surface.


International Journal for Numerical Methods in Engineering | 2000

Mixed-dimensional coupling in finite element models

R.W. McCune; Cecil Armstrong; Desmond Robinson

In many finite element analysis models it would be desirable to combine reduced- or lower-dimensional element types with higher-dimensional element types in a single model. In order to achieve compatibility of displacements and stress equilibrium at the junction or interface between the differing element types, it is important in such cases to integrate into the analysis some scheme for coupling the element types. A novel and effective scheme for establishing compatibility and equilibrium at the dimensional interface is described and its merits and capabilities are demonstrated. Copyright


acm symposium on solid modeling and applications | 1995

Computing the medial surface of a solid from a domain Delaunay triangulation

Damian J. Sheehy; Cecil Armstrong; Desmond Robinson

The medial surface of a solid object provides useful shape information which compliments existing model mpreserrtation schemes. The medial sulfate and its associated topological entities am defined and the major aspects of art algorithm for computing the medial surface of a large class of B-rEp solids is then presented. The algorithm is based on the domain Delaunay triangulation of a relatively sparse distribution of points which are generated on the boundary of the object. This strategy is adaptive, in that the boundary point set is retimed to guarantee a co~ct topological reptwen-tat ion.


Hydrological Sciences Journal-journal Des Sciences Hydrologiques | 2003

The use of flow duration curves as a data quality tool

R. A. J. Cole; Harold T. Johnston; Desmond Robinson

Abstract The end user of river flow data may have no knowledge of the quality control measures applied in their generation. Therefore, an independent quality indicator is needed to give confidence in their use. The use of long-term flow duration curves as an indicator of data quality is proposed. This method visually highlights irregularities in river flow data and enables the type and location of the error to be readily located. The method has been applied to data held by the Rivers Agency in Northern Ireland, leading to increased confidence in the database.


IEEE Sensors Journal | 2014

Development of a Bridge Weigh-in-Motion Sensor: Performance comparison using fibre optic and electric resistance strain sensor systems

Myra Lydon; Susan Taylor; Desmond Robinson; Paul Callender; Ciaran Doherty; S.K.T. Grattan; Eugene J. O'Brien

This paper addresses the problems of effective in situ measurement of the real-time strain for bridge weigh in motion in reinforced concrete bridge structures through the use of optical fiber sensor systems. By undertaking a series of tests, coupled with dynamic loading, the performance of fiber Bragg grating-based sensor systems with various amplification techniques were investigated. In recent years, structural health monitoring (SHM) systems have been developed to monitor bridge deterioration, to assess load levels and hence extend bridge life and safety. Conventional SHM systems, based on measuring strain, can be used to improve knowledge of the bridges capacity to resist loads but generally give no information on the causes of any increase in stresses. Therefore, it is necessary to find accurate sensors capable of capturing peak strains under dynamic load and suitable methods for attaching these strain sensors to existing and new bridge structures. Additionally, it is important to ensure accurate strain transfer between concrete and steel, adhesives layer, and strain sensor. The results show the benefits in the use of optical fiber networks under these circumstances and their ability to deliver data when conventional sensors cannot capture accurate strains and/or peak strains.


Aci Structural Journal | 2010

Investigation of Ultimate Strength of Deck Slabs in Steel-Concrete Bridges

Y. Zheng; Susan Taylor; Desmond Robinson; David Cleland

Many bridges are composite structures with reinforced concrete decks supported by longitudinal steel beams. The presence of the longitudinal steel beams and the unloaded area of concrete slab cause the loaded deck slabs to be restrained against lateral expansion. This creates a compressive membrane (or arching) action. This study uses experimental tests to investigate the effects of structural variables on the load capacity of the deck slabs of the composite bridges. A practical design approach is presented to assess the restraint stiffness that exists in the composite bridge deck and thereby the strength enhancement due to arching action. A series of one-third scale steel-concrete composite bridge models were built with several varying structural parameters, including concrete compressive strength, reinforcement percentage, and the size of steel supporting beams. After comparing the results of different models, the influence of these structural parameters on the amount of compressive membrane action in the deck slab was evaluated. Experimental results showed that compressive membrane action is influenced by concrete compressive strength and lateral restraint stiffness. The proposed method provided accurate, consistent but slightly conservative predictions for the strength of a wide range of deck slabs.


Archive | 2011

Arching Action in Laterally Restrained GFRP Reinforced Slabs

G. Tharmarajah; Susan Taylor; Desmond Robinson; David Cleland

Expansive corrosion in steel reinforcement significantly reduces the design life and durability of concrete structures. Glass Fibre Reinforced Polymer (GFRP) reinforcement is a more durable alternative to steel reinforcement and has higher strength to weight ratio than steel. Replacing conventional steel with GFRP reinforcement can be highly beneficial. FRP reinforcement can be successfully used in laterally restrained slabs due to enhanced strength above the flexural capacity and increased stiffness as a result of arching action. This paper discusses the tests carried out on three full scale concrete slabs strips reinforced with GFRP bars.


ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering | 2010

Axial Velocity Distribution at the Efflux of a Stationary Unconfined Ship’s Propeller Jet

W. Lam; Desmond Robinson; G.A. Hamil; Srinivasan Raghunathan

This paper is aimed at presenting an up-to-date investigation of the hydrodynamics of the jet (wake) of a stationary, unconfined ship’s propeller. The velocity field of a ship’s propeller jet is of particular interest for the researchers investigating the jet induced damage on a seabed as documented in previous studies. This paper discusses the time-averaged velocity field at the efflux, which is the immediate exit of the downstream propeller jet. The propeller jet is a rotating flow, which has axial, tangential and radial components of velocity. The axial component of velocity is the main contributor to the total velocity magnitude. Researchers are more interested in the axial velocity field within the ship’s propeller jet, due to the large contribution made by the axial velocity to the jet. The axial velocities at the efflux plane were obtained using joint experimental and numerical approaches. The results confirmed the two-peaked ridges axial velocity profile and disagreed with the 0.707Dp contraction suggested by Blaauw & van de Kaa (1978), Verhey (1983) and Robakiewicz (1987) at efflux of a ship’s propeller jet.Copyright


Archive | 1995

MEDIALS FOR MESHING AND MORE

Cecil Armstrong; Desmond Robinson; Robert McKeag; Tzuu-hseng S. Li; Stephen Bridgett; R. J. Donaghy; Ca McGleenan


IEEE Transactions on Visualization and Computer Graphics | 1996

Computing the: medial surface of a solid from a domain delaunay triangulation

Daniel Sheehy; Cecil Armstrong; Desmond Robinson

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Susan Taylor

Queen's University Belfast

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Gerard Hamill

Queen's University Belfast

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David Cleland

Queen's University Belfast

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Cecil Armstrong

Queen's University Belfast

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Wei-Haur Lam

Queen's University Belfast

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A Long

Queen's University Belfast

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David Hester

Queen's University Belfast

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