Measurement and Control

Bishop, D M

doi: 10.1177/002029407200500501pmid: N/A

A theoretical examination is made of the relationship between a control valve and the plant in which it is installed; the effect of valve size and characteristic on the relationship is described.From the theoretical basis, practical rules are devised for use at the design stage, also for later changes that may be necessary once the plant is in operation. Some well known practical difficulties are described, together with means of evading or overcoming them.

Walker, P H; Green, J W

doi: 10.1177/002029407200500502pmid: N/A

A method of designing controllers for multivariable systems is described which regards the problem from an implicit reference model point of view. The rules for the design are found to be very simple to apply and involve only proportional and integral terms if all the system state variables are available.The method is demonstrated by means of two examples, one being a second order system with two inputs and two outputs, the other being a fourth order system also with two inputs and two outputs.