Turbulence Hazard Metric Based on Peak Accelerations for Jetliner Passengers

By: Nasa, National Aeronautics and Space Adm

Calculations are made of the approximate hazard due to peak normal accelerations of an airplane flying through a simulated vertical wind field associated with a convective frontal system. The calculations are based on a hazard metric developed from a systematic application of a generic math model to 1-cosine discrete gusts of various amplitudes and gust lengths. The math model simulates the three degree-of- freedom longitudinal rigid body motion to vertical gusts and includes (1) fuselage flexibility, (2) the lag in the downwash from the wing to the tail, (3) gradual lift effects, (4) a simplified autopilot, and (5) motion of an unrestrained passenger in the rear cabin. Airplane and passenger response contours are calculated for a matrix of gust amplitudes and gust lengths. The airplane response contours are used to develop an approximate hazard metric of peak normal accelerations as a function of gust amplitude and gust length. The hazard metric is then applied to a two-dimensional simulated vertical wind field of a convective frontal system. The variations of the hazard metric with gust length and airplane heading are demonstrated.Stewart, Eric C.Langley Research CenterPASSENGERS; TURBULENCE; FLIGHT HAZARDS; LOADS (FORCES); ACCELERATION (PHYSICS); TRANSPORT AIRCRAFT; AUTOMATIC PILOTS; FUSELAGES; SIMULATION; DOWNWASH; DEGREES OF FREEDOM; CONTOURS; FLIGHT CONDITIONS; GUSTS; MATHEMATICAL MODELS...

• Format: Paperback
• Language: English
• ISBN: 1723770507
• ISBN13: 9781723770500
• Release Date: January 1
• Publisher: Independently Published
• Length: 38 Pages
• Weight: 0.25 lbs.
• Dimensions: 0.1" x 8.5" x 11.0"