טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentDekel Maya
SubjectPseudo-Spectral-Method Based Optimal Glide in the Event of
Engine Cut-off
DepartmentDepartment of Aerospace Engineering
Supervisor Professor Yoseph Ben-Asher
Full Thesis textFull thesis text - English Version


Abstract

Maximum range optimal glide is of great interest in different flight situations.

A common example is the event of engine cut-off during manned or unmanned flight. If the engine cut-off occurs at low altitude flight conditions, a controller for maximum range is needed in order to obtain safe landing; this problem may be approached as an optimal range glide problem which can be solved using Pseudo Spectral methods.

The research is focused on the computation of optimal trajectories, based on the minimum principle guidelines using pseudospectral methods, which can be performed by numerical software.

Two numeric optimal control softwares were tested, DIDO and GPOPS. Both softwares were easy to use and the results from both show convergence to the optimal trajectory in the horizontal plane and also in the 3D domain. The structure of the optimal trajectories and the structure of the resulting landing area are studied and the features of the optimal policies are identified. It has been shown that the trajectory can not be described by a combination of arcs and straight lines. The landing areas are all convex. The presence of wind affects the landing area. An approximation to this effect is proposed.