Bird, T 1985, 'Accurate asymptotic solution for the surface field due to apertures in a conducting cylinder', IEEE Transactions on Antennas and Propagation, vol. 33, no. 10, pp. 1108-1117.
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BRAUN, RM & DOWNING, BJ 1985, 'INJECTION-LOCK BANDWIDTH EXTENSION BY CONTROL MODULATION AND CURRENT HUMP SLOPE DETECTION', ELECTRONICS LETTERS, vol. 21, no. 13, pp. 564-566.
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Miyanaga, Y, Nagai, N & Miki, N 1985, 'ARMA digital lattice filter with white gaussian input', Electronics and Communications in Japan (Part I: Communications), vol. 68, no. 8, pp. 29-37.
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This paper presents a new synthesis method for ARMA digital lattice filters. These filters are obtained by a fast algorithm for estimation of ARMA parameters. Some fast algorithms for such estimation have already been proposed in which approximation models are derived using the input and output signals and can be applied to arbitrary input signals. Among these methods, the Mullis‐Roberts algorithm estimates the parameters by the autocorrelation coefficients and impulse response of observed signals. The method is similar to the parameter estimation using white Gaussian process for the input signals. Though the Mullin‐Roberts algorithm can estimate the parameters with less calculation cost than other algorithms, it is not suitable for designing different orders of the AR and MA parts. The fast algorithm proposed in this paper estimates the parameters with the same calculation cost as in the Mullis‐Roberts algorithm when the input signal is restricted to a white Gaussian process and obtains the ARMA parameters as the AR and MA orders are independently increased. The new ARMA lattice filter is synthesized by three prediction errors defined in the new algorithm and consists of a simpler structure than the usual filters of this type. By processing time series signals using the algorithm and the lattice filter, we show the feasibility of estimating the minimum realization for an ARMA model. Copyright © 1985 Wiley Periodicals, Inc., A Wiley Company
Moses, RG, Colagiuri, S & Shannon, AG 1985, 'Effectiveness of mass screening for diabetes mellitus using random capillary blood glucose measurements', Medical Journal of Australia, vol. 143, no. 12-13, pp. 544-546.
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The results of 23,228 fingerprick capillary blood glucose tests (the taking of which was coordinates by the Diabetic Association of New South Wales) were reviewed. All non-diabetic persons (n = 860) with a blood glucose result of greater than or equal to 8.0 mmol/L were surveyed and 459 responded (53.4%). The responders were typical of the surveyed group with respect to age and capillary blood glucose level. Sixty-four new cases of diabetes were detected, representing 15.8% of the replies from persons who were not known to have diabetes and 0.28% of the total number of persons screened.
Sedlacek, G, Lopetegui, J, Stutzki, C & Saleh, A 1985, 'Computer Aided Analysis of Space Frames Subjected to Nonlinear Loads.', Bauingenieur Berlin, vol. 60, no. 8, pp. 297-306.
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Two approaches in design of space frame structures are outlined and discussed. The kinematic equations for arbitrary large rotation of beams are formulated by means of rotation vectors. This is the so called displacement method. The other approach uses nonlinear computational algorithms. An iteration procedure was developed using initial stiffness matrix and orthogonal load-deformation-states.
SEKHON, JG & SHANNON, AG 1985, 'Mathematical Education of Engineers: an Australian perspective', European Journal of Engineering Education, vol. 10, no. 3-4, pp. 295-303.
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A series of surveys provide the basis for comments on the mathematical education of engineers in Australia. The respondents were graduates and employers. This paper summarises their views and contrasts undergraduate and postgraduate courses. The former tend to be traditional and structured. There is a need for more course work with the latter with more emphasis on mathematical modelling. Desirable professional attributes which should come from education with mathematics rather than mere training in mathematics are listed as they are seen in the milieu of the market place. © 1985, Taylor & Francis Group, LLC. All rights reserved.
Song, S-M, Waldron, KJ & Kinzel, GL 1985, 'Computer-aided geometric design of legs for a walking vehicle', Mechanism and Machine Theory, vol. 20, no. 6, pp. 587-596.
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Vigneswaran, S & Aim, RB 1985, 'The influence of suspended particle size distribution in deep-bed filtration', AIChE Journal, vol. 31, no. 2, pp. 321-324.
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Vigneswaran, S & Visvanathan, C 1985, 'Mathematical modelling of mobile bed filtration with contact flocculation - filtration arrangement', Effluent & Water Treatment Journal, vol. 25, no. 9, pp. 309-314.
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Mathematical formulation of suspended solids removal in contact-flocculation filtration is complex since both flocculation and suspended solids removal occur within the filter bed itself. In this study, a mathematical formulation based on O'Melia and Alis' model was developed for contact flocculation-filtration incorporating the flocculation phenomena in ideal conditions. This model was then extended to mobile bed filtration with contact flocculation-filtration arrangement and verified with laboratory-scale mobile bed filter experimental results obtained.
Vigneswaran, S, Thiyagaram, M & Aim, RB 1985, 'Mathematical modeling of radial flow filtration and its application to groundwater recharge problems', AIChE Journal, vol. 31, no. 11, pp. 1929-1933.
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Waldron, KJ, Wang, S-L & Bolin, SJ 1985, 'A Study of the Jacobian Matrix of Serial Manipulators', Journal of Mechanisms, Transmissions, and Automation in Design, vol. 107, no. 2, pp. 230-237.
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Inversion of the Jacobian matrix is the critical step in rate decomposition which is used to solve the so-called “inverse kinematics” problem of robotics. This is the problem of achieving a coordinated motion relative to the fixed reference frame. In this paper a general methodology is presented for formulation and manipulation of the Jacobian matrix. The formulation is closely tied to the geometry of the system and lends itself to simplification using appropriate coordinate transformations. This is of great importance since it gives a systematic approach to the derivation of efficient, analytical inverses. The method is also applied to the examination of geometrically singular positions. Several important general results relating to the structure of the singularity field are deducible from the structure of the algebraic system.
Watanabe, H, Miyanaga, Y, Miki, N & Nagai, N 1985, 'Arma spectral approximation methods with weighting functions', Electronics and Communications in Japan (Part I: Communications), vol. 68, no. 4, pp. 27-35.
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Bakoss, SL, Burfitt, A, Cridland, L & Heiman, JL 1970, 'MEASURED AND PREDICTED LONG-TERM DEFORMATIONS IN A TALL CONCRETE BUILDING.', Publication SP - American Concrete Institute, pp. 63-94.
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A 120m tall building incorporating both in-situ and precast post-tensioned concrete components was instrumented to observe some aspects of its structural behaviour. The instrumentation includes embedded and surface strain and temperature transducers, survey reference points, wind pressure tappings, and anemometers above the roof of the building to measure wind characteristics. The paper describes the strain and deformation instrumentation and method of data acquisition. The measured long-term vertical strains and deformations in one of the columns are presented and are compared with values predicted by two methods which are suitable for use by designers. Reference is made to the results of an extensive materials testing programme the results of which enabled the assessment of methods of prediction for the long-term creep and shrinkage properties of the concrete.
Bird, TS 1970, 'MUTUAL COUPLING IN WAVEGUIDE-FED PARALLEL PLATE LENSES.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 936-939.
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An element-by-element analysis of mutual coupling in waveguide-fed parallel plate lenses is described which uses solutions for the surface field excited by a magnetic dipole on a concave cylindrical conductor. Coupling coefficients computed by this method are compared with measured results for a circular and a Rotman lens.
Bird, TS & Poulton, GT 1970, 'ENVELOPE-CONSTRAINED PATTERN SYNTHESIS FOR SATELLITE ANTENNAS.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 567-570.
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Two techniques are compared for contoured beam design for on-board satellite antennas with constraints on both co-polar and cross-polar pattern envelopes. The techniques are based respectively on a penalty function approach and the method of successive projections and are applied to an array-fed single-offset reflector antenna producing a beam covering the south-east region of Australia.
Bone, D, Bachor, HA & Sandeman, RJ 1970, 'Spectral line interferometry of a laser produced Ba plasma', 15th AINSE Plasma Physics Conference.
Roper, H, Kirkby, GA & Baweja, D 1970, 'DURABILITY - A QUANTITATIVE APPROACH.', National Conference Publication - Institution of Engineers, Australia, pp. 32-35.
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Durability of concrete structures is, despite considerable interest, as yet ill-defined. Methods of classification and quantification of durability of concrete members have recently been outlined in a series of co-authored papers. The application of such methods to structures is outlined. The accumulation of data requires the use of a computer, and methods of transferring data from photographic or television images to storage is discussed. The data is then available for computations, which relate types of deterioration effects to reinforcement and other details. Statistical procedures are introduced to systematise the data, and to permit comparisons to be made between structural members, within the same structure or between structures. The approach should, if successfully applied, allow better measurements of durability to be made, and hence improve techniques of predicting performance, making comparisons between materials and systems, assessing repair procedures and estimating repair costs.
Vijaykumar, R, Tsai, M & Waldron, K 1970, 'Geometric optimization of manipulator structures for working volume and dexterity', Proceedings. 1985 IEEE International Conference on Robotics and Automation, 1985 IEEE International Conference on Robotics and Automation, Institute of Electrical and Electronics Engineers, pp. 228-236.
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Broadly speaking, the regional structure of a manipulator, which consists of the inboard three joints and the members associated with them, determines the workspace shape and volume. The orientation structure, which, for a six degree of freedom manipulator, consists of the three furthest outboard joints and members, determines the geometric dexterity or orientation potential of the manipulator. It is possible, using straight forward geometric arguments, to determine the optimal dimensions of the regional structure for a given total length. By the use of the spherical counterpart of Grashof's theorem formulated by Freudenstein, it is possible also to show that there is an optimum geometry of the orientation structure.
Waldron, K 1970, 'Mobility and controllability characteristics of mobile robotic platforms', Proceedings. 1985 IEEE International Conference on Robotics and Automation, 1985 IEEE International Conference on Robotics and Automation, Institute of Electrical and Electronics Engineers, pp. 237-243.
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© 1985 IEEE. Mobile platforms available for use in robotic systems vary enormously in their mobility and in their control characteristics. In particular, the characteristics which are desirable in an autonomous vehicle for unstructured terrain are quite different from those which are optimum in a vehicle for partially structured terrain, such as road following, or for a mobile platform for use in a highly structured factory environment. The controlled degrees of freedom of the platform impact the manner in which it can be used. Platforms with articulated steering are severely limited in situations, such as mobile industrial robot service, in which lateral motion may be desirable.
Waldron, K & Nordholt, N 1970, 'Force and motion management in legged locomotion', 1985 24th IEEE Conference on Decision and Control, 1985 24th IEEE Conference on Decision and Control, IEEE, pp. 12-17.
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The control of a legged locomotion system over uneven terrain requires a new approach to coordination. The system has a high degree of static indeterminacy and, because of the stiffness of the structural and actuation systems, has stability problems if position-velocity control is used. The problem has many similarities to that of grasping and manipulating an object in a multifingered hand. The stability problem is removed by controlling actuator force directly, but the necessary computations can be prohibitive. A solution is presented which is moderate in its computational requirements. It is based on an assumption of zero foot interaction forces in the horizontal plane.
Waldron, KJ, Song, SM, Wang, SL & Vohnout, J 1970, 'Mechanical and Geometric Design of the Adaptive Suspension Vehicle', Springer US, pp. 295-306.
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Some aspects of the mechanical and geometric design of the adaptive suspension vehicle are presented. In particular, there is an emphasis on aspects of the leg design and vehicle geometry, which affect the ability of the vehicle to operate on steep grades or to cross obstacles. A mechanism that maintains the attitude of the foot approximately parallel to the body is described. Geometric aspects of maintaining static stability on steep grades are discussed. Geometric and gait sequence aspects of crossing severe obstacles are also discussed.
