The open-loop trander function of a complex hydrostatic pump-motor dynamometer system was derived from an analysis o f the dynamics of the indiuiduul components. Many system components exhibit non-linearities, however, internal feedback mechanisms contribute to linearization of sub-systems. The resulting model, which was in good agreement with the system's open-loop performance, was used to predict the behaviour of the closed-loop system, this indicated that the system would be unstable. Classical control theory was used to analyse the performance of a number of stabilizing control strategies, with root locus plots, Bode diagrams and Nichols charts being used to assess the resultant performance. A lead compensation, designed as a diffoential controller, combined with a bi-linear gain was predicted to provide acceptable speed control. The performance of the system with this controller installed was found to satisfy the design requirements of speed of response, limited overshoot and zero steady-state error.
The open-loop transfer function of a complex Ward-Leonard dynamometer system was derived from an analysis of the behaviour of the individual components. The resulting model, which was in good agreement with the open-loop performance of the system, was used to simulate the behaviour of the closed-loop system; this indicated that the system would be unstable. Classical control theory was used to analyse the performance of a number of stabilizing control strategies, and root loci plots, Bode diagrams and Nichols charts were used to cissess the resultant performance. A proportional-plus-integral controller combined with lead compensation was predicted to provide acceptable control. The performance of the system with this controller installed was found to satisfy the design requirements of speed of response, limited overshoot and zero steady-state error.
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