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The methods discussed include gain scheduling, self-tuning, auto-tuning, and model-reference adaptive control systems. « lessĪ brief overview of adaptive control methods relating to the design of self-tuning proportional-integral-derivative (PID) controllers is given. Finally, the limitations of each of the STPI algorithms is discussed, some conclusions are drawn from the performance comparisons, and a few recommendations are made.
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The dynamic effects of process deadtime and noise are also considered. The STPI algorithms' performance with regard to both setpoint changes and load disturbances is evaluated, and their robustness is compared. Details of the process simulations developed to test the STPI algorithms are given, including an integrating process, a first-order system, a second-order system, a system with initial inverse response, and a system with variable time constant and delay.
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A brief theory of operation of these three STPI control algorithms is given. The STPI control algorithms are based on closed-loop cycling theory, pattern recognition theory, more » and model-based theory. The substance of the work is a comparison of three self-tuning proportional-plus-integral (STPI) control algorithms developed to work in conjunction with the Bristol-Babcock PID control module. Characteristics of the two most common types of self-tuning controllers implemented by industry (i.e., pattern recognition and process identification) are summarized. Several process identification and parameter adjustment methods are discussed. = ,Ī brief overview of adaptive control methods relating to the design of self-tuning proportional-integral-derivative (PID) controllers is given.
BRISTOL BABCOCK DPC 3330 SERIAL
The modular design of this system allows many possibilities for I/O point configuration example, a system with 20 analog inputs, 4 analog outputs, 16 discrete inputs, 16 discrete outputs, 2 counters, and 4 serial communications ports could be purchased for less than $7000 (hardware only). The scheduler more » module will work as described however, some of the modes seem redundant or incorrect. The logger module did not work because of an error in the early version of the firmware installed in the Beta unit tested, and this failure should not occur in production units. Except for the logger and scheduler modules, all the ACCOL II modules evaluated worked as described in the reference manual.
BRISTOL BABCOCK DPC 3330 SOFTWARE
The software test consisted of evaluations of only those Advanced Communication and Control Language (ACCOL) modules that have been added to Bristol Babcock controllers since previous evaluations were performed by this group.
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The unit was tested as a stand-alone controller because we did not have version 1.5 of Trolltalk-VAX software needed for the host VAX to support this unit. The difference in measurement methods used during this test from the methods used by BBI was the reason for the difference in CMRR values. Results of the hardware test verified that the hardware met or exceeded the company's published specifications for all test conditions except for the analog input common-mode rejection ratio (CMRR) measurement. Tests were performed on a Bristol Babcock, Inc., Model DPC 3330 process control system to determine the suitability of both hardware and software for use as a low-cost distributed or stand-alone control system.