Abstract
An examination of the behaviour of a dynamically loaded closed loop hydrostatic power transmission is described. Particular attention is given to the effects of the capacitance of the connections between rotating machines. It is shown that hydropneumatic accumulators fitted close to the pump inlet and motor return manifolds adequately control the pressure fluctuations that occur in the low pressure system during the loading cycles, provided the capacity of the accumulators is matched to the connection of capacitance. An analytical examination of the system elements is presented, and a general case mathematical model of the complete transmission has been developed in a form suitable for evaluation by digital computer. The theoretical predictions of transmission behaviour in response to dynamic loads are shown to compare adequately with experimentally measured results. The use of the model in studying the behaviour of intended systems at the design stage is shown by an examination of the effects of varying system parameters and loading cycles.
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