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Browsing by Subject "Applied mechanics"

Now showing items 1-17 of 17

Accuracy of semi-analytical finite elements for modelling wave propagation in rails

Author: Andhavarapu, EV ; Loveday, Philip W ; Long, Craig S ; Heyns, PS Date: Jan 2010 The semi-analytical finite element method (SAFE) is a popular method for analysing guided wave propagation in elastic waveguides of complex cross-section such as rails. The convergence of these models has previously been studied for linear ... Read more
Analysis of a new unidimensional model and lateral vibrations of 1-3 piezocomposite side scan sonar array

Author: Shatalov, MY ; Fedotov, I ; Wallis, JR ; Nicolaides, KE Date: Jan 2006 A novel unidimensional model of 1-3 piezocomposite ultrasonic transducers is presented. A new electromechanical model is the generalization of the Smith-Auld unidimentional model, which is formulated in terms of a variational approach. It ... Read more
Characterization and properties of breakwater structures modelled by a physics engine

Author: Greben, JM ; Gledhill, Irvy MA ; Cooper, Antony K ; De Villiers, R Date: Jan 2010 The authors examine the question of stability of breakwater structures using the simulation software PhysX. This “physics engine” can be used to construct various packings of breakwater elements, each of which can be used to analyze the damage ... Read more
An enhanced matrix-free edge-based finite volume approach to model structures

Author: Suliman, Ridhwaan ; Oxtoby, Oliver F ; Malan, AG ; Kok, S Date: Jan 2010 This paper presents the formulation, implementation and evaluation of an enhanced matrix free edge-based finite volume approach to model the mechanics of solids undergoing large non-linear deformations. The developed technology is evaluated ... Read more
Exact solutions and numerical simulation of longitudinal vibration of the Rayleigh-Love rods with variable cross-sections

Author: Shatalov, M ; Fedotov, I Date: Sep 2012 Exact solutions of equations of longitudinal vibration of conical and exponential rod are analyzed for the Rayleigh-Love model. These solutions are used as reference results for checking accuracy of the method of lines. It is shown that the ... Read more
Experimental development of an ultrasonic linear motor

Author: M'Boungui, G ; Loveday, Philip W ; Long, Craig S Date: Jan 2010 The authors investigate a novel ultrasonic motor which generates a stator trajectory in the form of a figure-of-eight by superimposing two resonant modes, with one double the frequency of the other. Topology optimization was used to design ... Read more
Experimental investigation into the unsteady effects on non-axisymmetric turbine endwall contouring

Author: Dunn, Dwain I ; Snedden, Glen C ; Von Backström, TW Date: Jan 2010 Turbine manufacturers are striving to develop turbines that are more efficient. One area of focus has been the control of secondary flows through the use of non-axisymmetric endwalls. The majority of development has been performed in cascades ... Read more
Experimental observation of capillary instabilities of two phase flow in a microfluidic T-junction

Author: Mbanjwa, MB ; Land, KJ ; Jewell, L ; Moss, EA ; Gledhill, Irvy MA Date: Jan 2010 This paper discusses the experimental observation of capillary instabilities of two-phase flow in a microfluidc T-junction. These instabilities are analogous to the classical Plateau-Rayleigh instabilities. The experiments were carried out ... Read more
A Mems based valveless micropump for biomedical applications

Author: Van der Merwe, SW ; Groenwold, AA ; Loveday, Philip W ; Thiart, GD Date: Jan 2010 The valveless micropump holds great potential for the biomedical community in applications such as drug delivery systems, blood glucose monitoring, and many others. In this paper, the authors investigate the characteristics of a planar ... Read more
Model to predict dynamic performance of a tractor semi-trailer car-carrier

Author: Deiss, JA ; Berman, Robert J ; Kienhofer, F Date: Sep 2018 A performance-based standards (PBS) framework evaluates actual on-road performance of a vehicle, allowing the length and mass of a vehicle to exceed prescriptive legislation, without compromising on vehicle safety and dynamic stability. This ... Read more
Modelling of fluid-solid interaction using two stand-alone codes

Author: Grobler, Jan-Hendrik ; de Villiers, R ; Cooper, Antony K Date: Jan 2010 A method is proposed for the modelling of fluid-solid interaction in applications where fluid forces dominate. Data are transferred between two stand-alone codes: a dedicated computational fluid dynamics (CFD) code capable of free surface ... Read more
Modelling property changes in graphite irradiated at changing irradiation temperature

Author: Kok, S Date: Jan 2011 A new method is proposed to predict the irradiation induced property changes in nuclear; graphite, including the effect of a change in irradiation temperature. The currently used method; to account for changes in irradiation temperature, the ... Read more
Numerical modelling of a thin deformable mirror for laser beam control

Author: Long, Craig S ; Loveday, Philip W ; Forbes, A ; Land, K Date: Jan 2010 For intra-cavity laser beam control, a small, low-cost deformable mirror is required. This mirror can be used to correct for time- dependent phase aberrations to the laser beam, such as those caused by thermal expansion of materials. A ... Read more
Reduced order modelling techniques for mesh movement strategies as applied to fluid structure interactions

Author: Bogaers, Alfred EJ ; Kok, S ; Malan, AG Date: Jan 2010 In this paper, we implement the method of Proper Orthogonal Decomposition (POD) to generate a reduced order model (ROM) of an optimization based mesh movement technique. In the study it is shown that POD can be used effectively to generate a ... Read more
Simulating the rubble mound underlying armour units protecting a breakwater

Author: Cooper, Antony K ; de Villiers, R ; Greben, JM ; van der Bergh, F ; Gledhill, Irvy MA Date: Jan 2010 A variety of concrete armour units laid on top of rubble mounds are used to protect breakwaters and other harbour infrastructure. Coastal engineers build three-dimensional physical scale models to understand the dynamic processes caused by ... Read more
Use of the gamma-ray absorption technique as a quality control procedure in the manufacture of powder metal shaped charge liners

Author: Lawrie, JJ ; Mostert, FJ ; König, PJ ; Werneyer, KD Date: Sep 2010 The use of the gamma-ray absorption technique as a tool in evaluating the quality of manufactured powder metal liners was investigated. With powder metal liners, it is not only of interest to know whether the liner conforms geometrically to ... Read more
Velocity flow field and water level measurements in shoaling and breaking water waves

Author: Mukaro, R ; Govender, K ; Gledhill, Irvy MA ; Kokwe, NL Date: Jan 2010 In this paper we report on the laboratory investigations of breaking water waves. Measurements of the water levels and instantaneous fluid velocities were conducted in water waves breaking on a sloping beach within a glass flume. Instantaneous ... Read more

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