Empirical approach to the modeling and control of ball mill grinding

Hodouin, D. ; Bazin, C.
Organization: Society for Mining, Metallurgy & Exploration
Pages: 10
Publication Date: Jan 1, 1987
Dynamic experiments were performed in a continuous open-circuit 40x40-cm ball mill using a pseudo-random binary sequence of the feed rate and measuring the variations of the discharge particle-size distribution. The impulse response is calculated by a cross-correlation technique. Then a model involving a discrete transferfunction and a time-series stochastic equation is calibrated using maximum likelihood methods. Based on this empirical model, a minimum variance controller with constrained input is designed and its performances are compared, by simulation, to the performances of a conventional PID regulator.
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