| Summary: | 碩士 === 淡江大學 === 機械工程學系 === 84 === Low level wind shear always is the focus of aviation
research, and its hazard to flight safety arise people''s
concern. This thesis use numericalmethod to simulate Boeing
747airplane''s trajectory under the influence of low level wind
shear, and try to analyze flight stragety, and its result can
help to improve flight training. Basically, there are three
different kinds of low level wind shearmodels, and the vortex
ring model is most realistic one, but still simple enough for
practical calculation. In order to simulate the actual physical
phenomenon, the unsteady vortex ring wind shear model has been
implemented in this work. Most of prior research on low level
wind shear always focuson flight altitude control. They have
assumed that the airplane is a point mass in the atmosphere, and
discuss it as a two dimensional motion. Butwe know if the
airplane penetrates wind shear windfield in a nonsymmetric axis
fashion, we can not ignore the effect of lateral wind. This
research use nonlinear six degrees of freedom rigid body
equation of motion tosimulate airplane''s flight condition under
the influence of low level wind shear, that is when the airplane
fly in three dimensional space, its attitudeangle must be
calculated into the equation of motion. Finally, we hope to find
proper flight trajectory by analyzing numerical results which
simulate airplane''s flight condition in different initial values
of attitude angle and thrust. The result presented here comfirm
the FAA ''Wind Shear Training Aid'', but is slightly different
from Avilo''s conclusion, and the author hope this result can
help to flight safety.
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