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Browsing by Author "Loveday, PW"

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  • Long, CS; Loveday, PW; Groenwold, AA (Elsevier, 2009-01)
    Two new solid-of-revolution axisymmetric finite elements, which account for hoop fibre rotations, are introduced. The first is based on an irreducible formulation, with only displacement and rotation fields assumed ...
  • Loveday, PW (Technomic Publishing Company Inc., 1996-01)
    Coupled electromechanical equations of motion, describing the dynamics of a vibrating cylinder gyroscope, are derived using Hamilton's principle and the Rayleigh-Ritz method. The vibrating cylinder gyroscope comprises a ...
  • M'Boungui, G; Loveday, PW; Long, CS (Springer verlag (germany), 2011-01)
    The use of topology optimization in the design of a novel stator for an ultrasonic motor (USM) is investigated. The design challenge is to produce a stator, with two resonant modes whose frequencies are in a ratio of 1:2. ...
  • Long, CS; Loveday, PW; Forbes, A (HVG Hanseatische Veranstaltungs-GmbH, 2008-06)
    An intra-cavity adaptive mirror is developed for compensation of time-dependent phase aberrations to a laser beam, such as those caused by thermal lensing. The unimorph-type device consists of a metallic disc, with a mirror ...
  • Cronje, JM; Heyns, PS; Theron, NJ; Loveday, PW (Sage Publications Ltd, 2005-03)
    In this paper we report on the development of a variable stiffness and damping Liquid Inertia Vibration Eliminator (LIVE) vibration isolator. The result is the ability to shift the isolation frequency of the isolator and ...
  • Long, CS; Loveday, PW; Groenwold, AA (Elsevier, 2009-09)
    The effects of selected membrane, plate and flat shell finite element formulations on optimal topologies are numerically investigated. Two different membrane components are considered. The first is a standard 4-node bilinear ...
  • Long, CS; Loveday, PW; Groenwold, AA (Springer -Verlag, 2009-01)
    The effects of selected planar finite element formulations, and their associated integration schemes, on the stiffness of a checkerboard material layout are investigated. Standard 4-node bilinear elements, 8- and 9-node ...
  • Loveday, PW (South African Conference on Computational and Applied Mechanics (SACAM), 2006-01)
    Piezoelectric patch actuators are employed for monitoring the health of structures and for performing active control of vibration. When the structure is long, slender and has constant cross-section, such as a pipe, rail ...
  • M'Boungui, G; Loveday, PW; Long, CS (SACAM 2010, 2010-01)
    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 ...
  • Loveday, PW; Long, CS (SACAM 2014, 2014-01)
    A transducer array comprising four transducers was developed and used to perform pulse – echo measurements on a heavy duty welded rail track. A signal processing algorithm, which uses properties of the propagating modes ...
  • Loveday, PW; Rogers, CA (Academic Press Ltd, 1998-10-29)
    The free vibration of thin cylinders with elastic boundary conditions was analysed by application of the exact solution of the Flugge shell theory equations of motion. The elastic boundaries were represented by distributed ...
  • Loveday, PW (2012-04)
    Cost-effective NDE of the vast length of ageing railway track around the world remains challenge for the community. Since continuously welded railway lines may be thought of as one-dimensional elastic waveguides, they are ...
  • Loveday, PW (Springer, 2012-07)
    Cost-effective NDE of the vast length of aging railway track around the world remains a challenge for the community. Continuously welded rail is installed in tension but temperature changes can result in rail buckling if ...
  • Loveday, PW; Wilcox, PD (Society of Photo-optical Instrumentation Engineers (SPIE), 2010-03)
    Guided wave propagation has been proposed as a means to monitor the axial loads in continuously welded railway rails although no practical system has been developed. In this paper, the influence of axial load on the guided ...
  • Litvin, IA; Loveday, PW; Long, CS; Kazak, NS; Belyi, V; Forbes, A (Society of Photo-Optical Instrumentation Engineers (SPIE), 2008-08)
    There are many applications in which a laser beam with a flat–top intensity profile would be ideal, as compared to a laser beam with a non–uniform energy distribution. Standard stable optical resonators will unfortunately ...
  • Loveday, PW; Long, CS (Elsevier, 2014-11)
    The ability to measure the individual modes of propagation is very beneficial during the development of guided wave ultrasound based rail monitoring systems. Scanning laser vibrometers can measure the displacement at a ...
  • Van der Merwe, SW; Groenwold, AA; Loveday, PW; Thiart, GD (SACAM 2010, 2010-01)
    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 ...
  • Loveday, PW; Long, CS; Forbes, A; Land, K (South African Conference on Computational and Applied Mechanics, 2008-03)
    An intra-cavity adaptive mirror is required to compensate for time-dependent phase aberrations to the laser beam, such as those caused by thermal lensing. A piezoelectric unimorph design can provide a small, low-cost ...
  • Loveday, PW; Rogers, CA (Institute of Electrical and Electronics Engineers Inc, 1998-09)
    A method for analyzing the effect of feedback control on the dynamics of piezoelectric resonators used in vibratory gyroscopes has been developed. This method can be used to determine the feasibility of replacing the ...
  • Long, CS; Loveday, PW (South African Institute for Non-Destructive Testing (SAINT), 2012-04)
    The analysis of travelling waves in elastic waveguides with complex cross-sections, such as train rails, can only conveniently be performed numerically. The semi-analytical finite element (SAFE) method has become a popular ...