Latin Abstract :
A new and fast recursive, exponentially weighted PLS algorithm which provides greatly improved parameter
estimates in most process situations is presented. The potential of this algorithm is illustrated with
two process examples: (i) adaptive control of a two by two simulated multivariable continuous stirred
tank reactor; and (ii) updating of a prediction model for an industrial flotation circuit. The performance
of the recursive PLS algorithm is shown to be much better than that of the recursive least squares algorithm.
The main advantage of the recursive PLS algorithm is that it does not suffer from the problems
associated with correlated variables and short data windows. During adaptive control, it provided satisfactory
control when the recursive least squares algorithm experienced difficulties (i.e., ʹblewʹ up) due to
the ill-conditioned covariance matrix, (XTX),. For the industrial soft sensor application, the new algorithm
provided much improved estimates of all ten response variables.
