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Problem izklapljanja avtomatskega sistema za uravnavanje sil na primarnih krmilnih površinah letala CRJ 900
ID Prešeren, Miha (Author), ID Grebenšek, Andrej (Mentor) More about this mentor... This link opens in a new window, ID Kosel, Tadej (Co-mentor)

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Abstract
Sistem za avtomatsko uravnavanje aerodinamičnih sil je v letalo vgrajen z namenom, da razbremeni mehanske napetosti na vodila in servomotorje, preko katerih avtopilot odklanja primarne krmilne površine. Problem nastane v fazah vzletanja in pristajanja, ko se sistem za avtomatsko uravnavanje aerodinamičnih sil občasno izklopi. Kot posledico na komandnem volanu takrat občutimo večjo silo, prav tako pa močno obremenjujemo celoten sestav krmilnih površin. Podrobno smo pregledali zgradbo krmilnega sistema in delovanje avtopilota na letalu CRJ 900. Pregledali smo povezanost primarnih in sekundarnih krmilnih površin letala. Lotili smo se iskanja rešitev za odpravljanje napake. Pri tem smo našli vzroke za nastanek napake in ugotovili njen negativni vpliv na koordiniranost leta. Našli smo tri rešitve, dve enostavnejši in eno kompleksnejšo. Ročno uravnavanje sil in ponovni zagon sta se izkazala kot ustrezni rešitvi, ki sta kasneje uspešno delovali tudi v praksi. Stroškovno najbolj neugodna rešitev v praksi ni bila preizkušena, saj bi moral postopek začeti proizvajalec letala CRJ 900.

Language:Slovenian
Keywords:krmilni sistemi, višinska krmila, krilca, zakrilca, avtopiloti, letala
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Place of publishing:Ljubljana
Publisher:[M. Prešeren]
Year:2020
Number of pages:XXI, 51 str.
PID:20.500.12556/RUL-114780 This link opens in a new window
UDC:629.7.062:629.7.025(043.2)
COBISS.SI-ID:17088539 This link opens in a new window
Publication date in RUL:10.03.2020
Views:839
Downloads:197
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Secondary language

Language:English
Title:Problem with disconnection of the system for automatic trim of aerodynamic forces on the primary flight control surfaces of the CRJ 900 airplane
Abstract:
System for automatic trim of aerodynamic forces is installed on the airplane to prevent mechanical overstressing of servo and flight control cables which are used by the autopilot to deflect airplane's primary flight control surfaces. The problem appears when the system for automatic trim of aerodynamic forces occasionally disconnects itself, particularly during two phases of flight, the initial climb and the final approach. As a consequence, higher forces are felt on the control column, and higher loads are acting on the whole construction of the flight controls system. We have taken a closer look at design of the flight controls system and the operation of autopilot on the CRJ 900 airplane. We have explained the connection between primary and secondary flight controls surfaces of the airplane. We have tried to figure out possible solutions on how to prevent this promblem from happening again. In the meantime we discovered the reason of this problem and it's negative impact on airplane's coordinated flight. We found three solutions, first two solutions are more simple and the third one is complex. Manual trimming of aerodynamic forces and reset of the flight controls computer are more practical and had been tested in real during a real operation of the airplane and both of them had solved a problem. The most expensive solution has not been tested, because the initiation of this solution would have to be started by the manufacturer.

Keywords:flight controls systems, elevators, ailerons, flaps, autopilots, airplanes

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