ETD system

Electronic theses and dissertations repository

 

Tesi etd-09132017-191817


Thesis type
Tesi di laurea magistrale
Author
CASCARANO, SIRENA
URN
etd-09132017-191817
Title
Progetto di un sistema di atterraggio automatico con controllori basati su logica fuzzy
Struttura
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA AEROSPAZIALE
Supervisors
relatore Prof. Mengali, Giovanni
correlatore Prof. Quarta, Alessandro A.
Parole chiave
  • algoritmo genetico
  • atterraggio automatico
  • fuzzy logic
Data inizio appello
02/10/2017;
Consultabilità
Parziale
Data di rilascio
02/10/2020
Riassunto analitico
In the last years various approaches have been proposed for automatic lan-
ding. This thesis presents the design of an automatic landing control system
that has been developed using a proportional-derivative (PD) type of fuzzy
logic controller.
A six-degree-of-freedom nonlinear model of F16 is employed for both steps of
this work. Firstly a linear PID controller is developed with standard
approaches in order to follow the imposed trajectory during the landing pha-
ses, simultaneously by means of the engine thrust and the elevator. Then a
nonlinear control system is designed as a Supervisory Expert Control System
(SECS) using fuzzy logic for the glide path capture and the
flare maneuver
to converge the aircraft's path to the reference trajectory.
For these two phases the trajectory is specifi ed in the longitudinal plane
respectively as a straight line and an exponential curve, along which the air-
craft has to descend.
The scaling factors of the fuzzy logic controller are optimized by means of a
genetic algorithm.
The controller obtained is used to simulate the maneuver also with a modifi ed
value of the moment coefficient cm. The simulations show the improvements
in the behavior of the system using fuzzy logic with respect to a linear
controller.
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