An in flight investigation of pitch rate flight control systems and application of frequency domain and time domain predictive criteriaThe degree of attitude control provided by current integral-proportional pitch rate command-type control systems, while a prerequisite for flared landing, is insufficient for 'Level 1' performance. The pilot requires 'surrogate' feedback cues to precisely control flight path in the landing flare. Monotonic stick forces and pilot station vertical acceleration are important cues which can be provided by means of angle-of-attack and pitch rate feedback in order to achieve conventional short period and phugoid characteristics. Integral-proportional pitch rate flight control systems can be upgraded to Level 1 flared landing performance by means of lead/lag and washout prefilters in the command path. Strong pilot station vertical acceleration cues can provide Level 1 flared landing performance even in the absence of monotonic stick forces.
Document ID
19840060695
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Berthe, C. J. (Calspan Corp. Buffalo, NY, United States)
Chalk, C. R. (Calspan Advanced Technology Center Buffalo, NY, United States)
Sarrafian, S. (NASA Flight Research Center Edwards, CA, United States)