On Fly-By-Wire control system and statistical analysis of system performance

Article Abstract:

The flight control system proposed for future Boeing commercial airplanes is a Fly-By-Wire (FBW) system. The entirely electronic FBW system will replace the mechanical cable/quadrant/pushrod system used on earlier airplanes. The FBW system, also called an Electronic Flight Control System (EFCS), must meet extremely high standards of integrity and reliability. The heart of the FBW concept is the use of redundant, dissimilar computing and communication channels. Predicting the performance of such a system is beyond the capabilities of conventional simulation and control system design methods. Moreover, the number of independent, random parameters in the system makes straightforward Monte Carlo analysis prohibitively expensive. This paper describes the simulation methods used to model the EFCS, and the use of statistically designed experiments to extract more information about the performance of the EFCS with a smaller number of simulation runs than is possible with a less structured approach. The results of the analysis defined the performance of the EFCS, especially the tails of the distributions of the performance measures, with much greater confidence than could have been gained by more conventional methods. (Reprinted by permission of the publisher.)

Systems analysis, Industrial research, Product introduction, Control systems, Modeling, Data modeling software, Research and Development, System Design, Flight Simulator, Aircraft, Statistical Analysis, New Technique, Performance Prediction

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Testing for initialization bias in simulation output

Article Abstract:

A test is presented for detecting the presence of initialization bias in the mean of a simulation output process. The test is based on a standardized sequence of linear combinations of the ranks of the simulation observations. The validity and power of the tests are illustrated by applying it to a large number of independently seeded experiments on the M-M-s queue with s=1 and s=4. (Reprinted by permission of the publisher.)

Tests, Simulation, Testing, Initialization

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