原文如下,速度啊,要多少分都行...
One of the most significant applications of computer equipment is in automatic feedback control systems. J. G. Truxal has been asked to bring this field of activity into focus by identifying the types of computers employed in the role of active controller, establishing major types of control functions, and carrying the reader to the advanced control systems sometimes considered to be one aspect of the artificial intelligence field. The paper discusses the fundamentals of each type of application in a form that is suitable to the general reader and is a useful summary and comparison for the computer engineer.-The Guest Editor
Summary-Modern automatic feedback-control systems are making increasing use of electronic computers as active controllers. The trend from the use of simple electric circuits and elementary analog devices toward high-speed digital computers (or computers employing both digital and analog devices) is accelerated by 1) the rapidly growing complexity of modern control systems; 2) the increasing importance of self-adaptive control; and 3) the development of optimizing control. Recent applications of computer control include the automatic control of boiler operation in an electric generating station, the adaptive autopilots for piloted aircraft, and the automatic control of load dispatching in electric power distribution.
THE technology of automatic control experienced its earliest rapid growth during the Second World War and the decade following. Throughout this period, control-system design followed closely the feedback-amplifier technology so fully developed by Bode and others; design ordinarily involved the selection of appropriate electric circuits for insertion within the feedback system in order to obtain satisfactory performance of the over-all system.
During the last five years, control technology has acquired an entirely new
dimension. With the development of high-speed flexible digital computers of attractive size, power consumption, and cost, the control engineer is able to utilize computers as elements of the feedback system. Integration of a computer (whether special-purpose or general-purpose, purely digital or hybrid analog-digital) into the classical controller circuit permits the control-system designer to expand his activities in three important directions:
1) The control of complex systems,
2) Adaptive control,
3) Optimizing control.
The following sections discuss in turn each of these three aspects in an attempt to delineate the class of control problems which become amenable to solution when computers are admitted as control elements, and to discuss the requirements placed on the computer for the control application and*
The probable future directions of development of this control-computer technology. In each case, examples are cited of current applications of computer- control concepts.
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