Definition of Acceptable Levels of Mismatch for Equivalent Systems of Augmented CTOL (Conventional Take-Off and Landing) Aircraft

摘要

High order pitch rate frequency responses of augmented aircraft can be broken down into the response of a low order equivalent system, and the mismatch between the response of the actual high order system and the low order equivalent. This study used variable stability NT-33 in-flight data to define frequency response envelopes of acceptable levels of mismatch. The envelopes were narrowest in a region believed to coincide with the piloted crossover region. The computer program for obtaining the equivalent system was then modified to weight the match in the crossover region. Equivalent system summaries for the LAHOS and Neal-Smith data sets are included. (Author)