No abstract

The rollback or proportional model is widely used in pollution control calculations and included in the guidelines for preparing and evaluating state implementation plans. Its basis and limitations are not widely known or understood. In this paper, the basis and limitations of rollback are listed and discussed, and extensions of basic rollback are proposed.

No abstract

Disturbance Observation Control (DOC) is an e f f d v e technique for corrtrolling mechamcal plant in the face of internal and external disturbances. By addingtransducers to measure the controller input and the plant output it is possible to obtain an indirect measure of the total disturbance. This may be fed forward to effect cancellation. To obtain the best performance it is necessary to have a good estimate of the plant inertia matrix, but unfortunately this is often not available. Here we present a method for obtaining an estimate ofthe inertia matrix that is amenable to optimisation. By the use of a "probing input" a measure can be obtained of the accuracy of the estimate. Thrs may be updated, either continuously or peridcally so as to dnve the estimate closer and closer to the actual value.

No abstract