Abstract
Abstract In this paper a new approach to control full CD profiles in sheet forming processes is presented. The method consists of a sequence of dimension reductions of the input, output and external disturbance spaces, while alleviating ill-conditioning problems. SVD is used to initially condition the input-output space, and then the order of the subspace of the dominant disturbances is identified on-line through the use of the Karhunen-Loeve expansion. Subsequently the dimension of the input space is further reduced by projecting it onto the disturbance subspace. Finally, model predictive control able of handling input constraints is implemented on this space.
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