POWER SPECTRAL ANALYSIS OF SOME AIRPLANEnRESPONSE QUANTITIES OBTAINED DURING OPERATIONAL TRAINING MISSIONS OF A FIGHTER AIRPLANE

摘要

The frequency content of some airplane response quantities obtained from a number of operational training flights of a fighter airplane is presented. Power spectral densities of normal and transverse load fac¬tor and pitching acceleration are shown for several types of missions normally performed by the airplane. The frequency content, which is described by the spectrum, provides information which is useful in control-system design and in the design of recording and computing equipment for analyzing maneuver-load data.nWhen normalized by dividing by the mean-square value, the results indicate that, except for some differences at the higher frequencies due to the effect of rough air, the frequency content of each of the airplane response quantities was similar during the different types of missions investigated.nThe normal-load-factor data were found to exhibit some of the char-acteristics- of a Gaussian random process;therefore, peak distributions for this quantity could be estimated to a good degree of accuracy with the use of spectrum-analysis methods.