The behavior of very large aircraft disturbed by wind shear and atmospheric turbulence (vertical gust during the landing approach) is analyzed by means of a multiloop system. The aircraft considered were a B-747-like aircraft and two hypothetical aircraft, the VLAC-1A and The VLAC-4A, with weights ranging from 500,000 to 4,000.000 lbs. A combined system, consisting of an autothrottle to control airspeed and a human pilot model to control altitude, was developed. It was shown that because of the decreasing value of short period value with increasing aircraft weight, a larger value of the lead time constant is needed for the larger aircraft resulting in a worse pilot rating. Results indicated that due to higher approach speeds of the larger aircraft, a higher percentage of the available thrust will be needed to cope with a given wind shear. Increased engine response lag can deteriorate altitude control.
Behavior of Very Large Aircraft Disturbed by Wind Shear and Atmospheric Turbulence
1972
61 pages
Report
No indication
English
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