Simultaneous Identification of Short Period and Phugoid Stability Parameters Using an Advanced Likelihood Method.

摘要

An investigation was conducted to determine the feasibility of obtaining the short period and phugoid stability derivatives from one maneuver, simultaneously. It was concluded that the maximum likelihood identification program SCIDNT I showed great promise in obtaining the short period and phugoid stability derivatives from one maneuver. Extraction of the short period stability parameters in the presence of the phugoid was easy, straight forward, and yielded results similar to those obtained from pure short period data. Estimation of the phugoid stability parameters was possible when they were estimated in conjunction with Zo, Xo, Mo, and Theta O. It was recommended that a new set of data be obtained at a flight condition where the phugoid is at least moderately damped and that this data be analyzed to resolve the present anomalies. (Author)