Monitoring and Control Systems for Automated Process Plants

Abstract

This paper discusses a philosophy of automation and control for process plants which are located in space environments and may be some distance from the nearest human presence. One or more human operators interact through a communication channel with the plant in an effort to cause useful things to happen. Direct operator control is not feasible due to time delay in the communication channel. Complete autonomy is not feasible due to various limitations on current technology. Major variables of the problem include the nature and degree of automation of the plant, and the distribution of machine (artificial) intelligence between the operator location and the plant site.

The discussion begins with a review of Sheridan's paradigm for supervisory control of telerobots. Here the machine intelligence is distributed between the operator site and the plant site, and there are a number of local sensing and control loops as well as remote monitoring and command loops. For operation of a complex process plant, this control philosophy must be expanded and extended in a number of areas.

After description of some recent research on operation of a robot-assisted biochemical analysis laboratory planned for Space Station Freedom, an extended architecture is proposed and several topics for continued research are outlined. These include, but are not limited to: distributed supervisory control by intelligent agents, design and function of the telerobots, use of neural networks for sensing and preprocessing, smart components, advanced artificial intelligence, and communication requirements.


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Last modified: January 13, 2006 -- © François Cellier