Baker, JE & Waldron, KJ 1974, 'The CHCH- linkage', Mechanism and Machine Theory, vol. 9, no. 3-4, pp. 285-297.
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Although many studies have been carried out to determine existence criteria for different configurations of spatial linkages, no previous publication has included results for mechanisms with non-parallel screw joints. Waldron's comprehensive results for all four-bars, exclusive of those with screw joints, suggest that the CHCH- configuration is the only one likely to lead to new mobile solutions. The present paper develops the existence criteria for this linkage, using the technique of solution of closure equations. © 1974.
Thies, AW, Hawryszkiewycz, IT & Gannon, DJ 1974, 'DESIGN OF THE AUSTRALIAN POST OFFICE COMPUTER NETWORK.', undefined.
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The Australian Post Office is establishing a computer network which will perform all its new ADP tasks and gradually take over the tasks which have already been developed for and are operating on its existing batch processing facilities. The considerable geographical extension together with the relatively low population density in most parts of the continent emphasize the role which communications play in the design and implementation of such a network. A lay-out with limited decentralization of main processing power and heavy reliance on line communications was selected. The approach to the design of this network is described. Issues of centralization of processing facilities are covered. Reliability requirements are defined and given emphasis in design considerations. Direct information interchange with other systems is expected to occur early, and to grow in the life-time of the first equipment. Restrictions on such intercommunication are recognized to result from lack of general standards. Some aspects of standardization are discussed.
YEO, BP, WALDRON, KJ & GOH, BS 1974, 'Optimal initial choice of multipliers in the quasilinearization method for optimal control problems with bounded controls', International Journal of Control, vol. 20, no. 1, pp. 17-33.
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An algorithm to choose the initial multipliers optimally for quasilinearization solution of optimal control problems with bounded controls and constant multipliers is Proposed. It uses diagonal matrices of weighting coefficients in the performance index of an auxiliary minimization problem. This auxiliary performance index comprises the cumulative error in the system constraints and the optimum conditions in the original cxtremization problem. The auxiliary performance index is quadratically dependent on the multipliers for given state and control functions. The resulting variational problem leads to linear Euler equations. The computational characteristics of the proposed method are demonstrated with two numerical examples. © 1974 Taylor & Francis Group, LLC.
