Offline Optimization of a Four Dimensional TF/TA Problem Considering Engine Dynamics

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Gharib Otaghsaraee, Salman | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47858 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Nobahari, Hadi; Banazadeh, Afshin
Abstract:
In this thesis, the problem of offline trajectory optimization of a flying vehicle has been solved. Terrain following/ terrain avoidance has been considered as a guiadanec strategy of vehicle. The point-mass model in three dimensional space for flight simulation and the transfer functions for modeling of vehicle dynamics has been used. One of the constraints of this problem is related to engine’s dynamic behavior, which is not considered in the privious works. So in this thesis at first, a turbofan engine has been modeled and it’s static and dynamic model has been obtained. Then, the effect of engine’s dynamic model in the trajectory optimization has been investigated. The results show that there are scenarios in which ignoring the engine’s model, leading to a collision with the terrains. In order to evaluate this issue numerically, Monte Carlo simulation has been used. Also in this thesis, the problem of trajectory optimization is modeled and solved as a four dimensional problem. Ie, in addition to position of trajectory points, the optimal time of crossing these points are achieved
Keywords:
Terrain Following Avoidance ; Dynamic Model ; Four Dimensional Trajectory Optimization ; Point-Mass Model ; Motor Dynamic Model