Study of Longitudinal Landing Flying Qualities Evaluation Using Pilot Model Theory

摘要

Control Anticipation Parameter used as a longitudinal handling qualities criterion does not adequately distinguish between different flight phases. Recent flight test data from the Landing Approach Higher Order Systems (LAHOS) study further indicate the inadequacy of the second order approximation for higher order longitudinal landing flying qualities. Nine aircraft that fall within the Level 1 boundary reveal pilot ratings ranging from 1.5 to 10. These nine aircraft are studied be combining their longitudinal dynamics with pilot modelling to examine a better method of landing flying quality prediction and evaluation. Pilot model theory (cross-over pilot model) is successfully combined with classical root locus and frequency response techniques to establish a frequency separation criterion called Loop Separation Parameter (LSP). Landing longitudinal evaluation and pilot rating predictions are consistent using the LSP method. In this thesis LSP is defined as the difference in resonant frequencies in pitch attitude and flight path angle control loops (with a pilot in each loop). Very acceptable prediction of pilot ratings (Cooper/Harper scale) along with PIO frequencies are demonstrated using the LSP method. LSP can also be used as an measurement technique to estimate pilot lead (a linear pilot model parameter). The landing test data also indicates an apparent transition of pilot emphasis from pitch control to flight path angle control in the landing flare. Time series analysis were performed on two example aircraft to validate LSP theory independently. The theory developed is applied to estimate pilot ratings for the X-29A longitudinal mode flying qualities.