A multivariable reactivity control algorithm is developed to maintain acceptable reactor spatial kinetics response during reactor power cycling. A modal model for describing the space-time kinetics response of a CANDU...
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A multivariable reactivity control algorithm is developed to maintain acceptable reactor spatial kinetics response during reactor power cycling. A modal model for describing the space-time kinetics response of a CANDU (Canadian Deuterium Uranium) reactor is devised and ultilized in the control study. A one neutron energy group approximation and other assumptions appropriate to the CANDU reactor studied are used to derive a diffusion equation from the linearized Boltzman equation. The effects of Xe135and I135are incorporated in the model. The kinetics variables are expanded in terms of an infinite series of eigenfunctions which are solutions of the scalar Helmholtz equation solved on the volume of the reactor. The control reactivities are modelled as an evenly distributed reactivity for gross reactor load cycling and point reactivity devices for spatial control. The system dynamics equations are written in a bilinear state space form. An algorithm is devised to determine the control vector required to achieve a desired kinetics behaviour about the nominal response. The algorithm is illustrated for a typical load cycle by means of a digital computer program.
A self-tuning method is described for a simple discrete-time control algorithm presented in a previous paper. With self-tuning, the algorithm is a candidate for a new class of single-loop controllers that would be con...
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A self-tuning method is described for a simple discrete-time control algorithm presented in a previous paper. With self-tuning, the algorithm is a candidate for a new class of single-loop controllers that would be considerably more convenient to use than the present analog PID controllers. Experimental results are presented indicating the applicability of the tuning and control algorithms to typical, nonideal processes.
Discretization of a popular continuous-time control algorithm is effected and an equivalent discrete-time identification law developed and compared to a published discrete identification algorithm developed from Lyapu...
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Discretization of a popular continuous-time control algorithm is effected and an equivalent discrete-time identification law developed and compared to a published discrete identification algorithm developed from Lyapunov Theory. Results are compared as regards asymptotic stability as insured using Lyapunov theory. Some analysis and design guidelines are proposed as regards implementation and practical utility.
With an artificial pancreas insulin was delivered through a venous infusion and the rate of delivery was adjusted according to data provided by a continuous blood glucose monitor. After different trials, control algor...
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With an artificial pancreas insulin was delivered through a venous infusion and the rate of delivery was adjusted according to data provided by a continuous blood glucose monitor. After different trials, control algorithms integrating 2 parameters were selected: instantaneous blood glucose concentration and increasing or decreasing patterns of blood glucose. A constant basal insulin infusion rate was added and improved the control of glycemic excursions. Different parameters concerning exogenous insulin homoeostasis were determined. The delay to reach an insulin effect was 18 .+-. 2 min and was shortened by a priming-dose at the beginning of the infusion. The insulin effect remained for 28 .+-. 2 min after the infusion had been stopped, but differences were noted in the morning (21 .+-. 2 min), in the afternoon (32 .+-. 2 min) and during the night (25 .+-. 3 min). Insulin needs were evaluated during meals. Related to the amount of carbohydrates, the doses fell from 0.53 units/h per g of carbohydrate for breakfast to 0.15 for dinner. From these data, it appears that the efficiency of exogenous insulin exhibits a circadian rhythm.
A tactile-controlled robot that makes possible precision inserting operations with a clearance of only a few microns is described. The principal part of this robot is the insertion control unit, which integrates posit...
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The artificial .beta.-cell is a Glucose controlled Insulin (and dextrose) Infusion System (CGIIS) for maintaining normoglycemia in diabetic conditions and other disturbances of metabolism. The insulin and dextrose inf...
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The artificial .beta.-cell is a Glucose controlled Insulin (and dextrose) Infusion System (CGIIS) for maintaining normoglycemia in diabetic conditions and other disturbances of metabolism. The insulin and dextrose infusion rates are calculated by a microcomputer according to the static glucose concentration (proportional control) and to its rate of change (dynamic control). The algorithmscontrolling the computer can be adapted to the subjects'' requirements. The artificial .beta.-cell is able to maintain blood sugar values in diabetics within physiological ranges during the course of the day. The response of the artificial .beta.-cell was examined using a 100 g oral glucose load in severe diabetics. The 1st type of control algorithms applied effected a small initial insulin infusion following OGTT in 8 juvenile diabetics connected with the artificial .beta.-cell. The glucose responses thus obtained were similar to latent diabetes. When the computer was controlled by the 2nd type of algorithms with a more responsive dynamic control and a consequently higher initial insulin infusion, in 1 diabetic OGTT [oral glucose tolerance test] fully normalized, whereas an improvement was achieved in another diabetic patient. control algorithms must be varied individually, depending on residual .beta.-cell function and glucose regulatory mechanisms.
Due to the rapid growth in LSI (large-scale integration) technology, it is now/lossible to consider implementing a discrete (digital) single-loop programmable controller. This paper discusses some software aspects of ...
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For the control of a multi-input, multi-output process with time delays, algorithms for noninleractive control with lime delay compensation are developed. These are then applied to a 3 input, 3 output process, to obta...
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A technique is presented for the design of a continuous nonlinear multi-variable control algorithm from a set of simple, linear control models. The coefficients of the linear control models are dependent on the steady...
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