Accession Number : AD0674503

Title :   ANALOG COMPUTER INVESTIGATION OF THE 'OFF-LINE' CONTROL CONCEPT.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SHIP ENGINEERING CENTER PHILADELPHIA PA PHILADELPHIA DIV

Personal Author(s) : Garnett,J. R.

Report Date : 10 JUL 1968

Pagination or Media Count : 50

Abstract : This report describes the investigation of a control scheme in which the output of an integral controller in a feedback path is used to modify the gain of a feedforward control path. This control scheme is referred to as 'off-line' integration. The system used for this investigation was an analog computer simulation of a heat exchanger in which it was desired to maintain the outlet temperature of the heated fluid constant by controlling the flow rate of the heating fluid when the heated fluid flow rate was subjected to increasing and decreasing 'ramp' disturbances. Comparison of the 'off-line' controller to the conventional proportional-plus-integral controller was made on the basis of the minimum integral of the absolute value of the error. Findings indicated a significant improvement in system transient response for the 'off-line' controller. Experimental results are presented as enclosures to this report. (Author)

Descriptors :   (*HEAT EXCHANGERS, CONTROL SYSTEMS), (*CONTROL SYSTEMS, OPTIMIZATION), ANALOG COMPUTERS, SIMULATION, AUTOMATIC, TRANSIENTS, RESPONSE, FEEDBACK, FLUID FLOW, TEMPERATURE, NAVAL EQUIPMENT, ERRORS, CORRELATION TECHNIQUES, DIAGRAMS, COMPUTER PROGRAMMING

Subject Categories : Operations Research
      Computer Programming and Software
      Computer Hardware
      Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE