Systems Analysis of Integrated Networks of Tasks (SAINT) network and computer simulation techniques were applied in support of the Digital Avionics Information System (DAIS) advanced development program. A computer-programmed model was developed to closely parallel Aerospace Medical Research Laboratory's Advanced Cockpit Design Simulator (ACDS) man-in-the-loop experiments with respect to task scenarios, task durations, and control tolerances used. Networks developed for the model represented both multifunction switching and multipurpose display concepts of DAIS and dedicated avionics subsystem display and control concepts of conventional aircraft systems. Exercise of the computer model provided estimates of the nature of primary and secondary task interaction, performance predictions, and validation of the modeling concepts and accuracy within the limits of the available empirical data.
SAINT is a modeling and simulation technique that provides the concepts necessary to model systems that contain tasks (discrete elements), state variables (continuous elements), and interactions between them.SAINT has been designed to facilitate the modeling and analysis of complex man-machine systems.This paper describes a SAINT network model of a real-time simulation of a drone control facility (DCF) in which operators monitor and control the flight of simulated remotely piloted vehicles (RPVs) through the use of visual (CRT) displays.
SAINT CONCEPTS AND THE RPV/DCF MODELThe SAINT (Systems Analysis of Integrated Networks of Tasks) simulation philosophy is to separate modeling from analysis. A graphical-network approach to modeling is taken, whereby a SAINT user describes the system to be analyzed through a network model and auxiliary descriptions. A SAINT network model contains a generalized set of symbols that facilitate the description of a system in network terms. The SAINT computer simulation program accepts a description of the model to be simulated and automatically performs an analysis to obtain estimates of statistical quantities that represent system performance. (Pritsker, 1974;.A SAINT model contains two basic components. The task-oriented component of the model is a network consisting of nodes, branches, and operators. The state variable component consists of the description of system variables that change values continuously over time.
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