A Demonstration of the Use of Generalized Parity Relations for Detection and Identification of Instrument Failures of a Free-Free Beam

摘要

A means of detecting failures in sensors and actuators on board large, flexible space structures is described. A failure detection and indentification (FDI) method which does not require triplication of position, attitude, and shape data is that of generalized parity relations. Parity relations are derived and an FDI routine is implemented on a computer-simulated flexible beam modeled on an experimental beam at NASA Langley Research Center. The effectiveness of the FDI procedure is relatively insensitive to disturbances and noise, but is very sensitive to modeling errors, including frequency errors, mode shape errors, and sensing and actuation spillover.