Showing papers on "PID controller published in 1975"

Gain adjusting an optimal regulator

Abstract: In the letter, starting with a varying output weighting matrix, an attempt has been made to construct an optimal controller comprising a feedback controller with variable gain depending on the variation of state and feedforward controller with gain proportional to derivatives, as well as deviations of polynomial-type measurable disturbance.

Controller circuit with PI or PID action - has switches to cut out I action using clamping circuit with operational amplifier

Abstract: The I action is switched off after an adjustable value of the control variable has been reached. A clamping circuit limits the control variable to the adjustable value until an adjustable value of the control deviation is reached. The clamping circuit can contain an operational amplifier, to whose inputs the control variable and a voltage with the adjustable value are conveyed and whose output is connected via a diode to the input of the controller circuit. A relay, activated via the amplifier output, has a working contact parallel to a capacitor determining the I action of the controller circuit.

Evaluation of optimal control type models for the human gunner in an Anti-Aircraft Artillery (AAA) system

Abstract: The selection of the structure of optimal control type models for the human gunner in an anti aircraft artillery system is considered. Several structures within the LQG framework may be formulated. Two basic types are considered: (1) kth derivative controllers; and (2) proportional integral derivative (P-I-D) controllers. It is shown that a suitable criterion for model structure determination can be based on the ensemble statistics of the tracking error. In the case when the ensemble tracking steady state error is zero, it is suggested that a P-I-D controller formulation be used in preference to the kth derivative controller.