20.500.12556/RUL-114780 Problem izklapljanja avtomatskega sistema za uravnavanje sil na primarnih krmilnih površinah letala CRJ 900 Problem with disconnection of the system for automatic trim of aerodynamic forces on the primary flight control surfaces of the CRJ 900 airplane 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. 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. krmilni sistemi višinska krmila krilca zakrilca avtopiloti letala flight controls systems elevators ailerons flaps autopilots airplanes true false false [M. Prešeren] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2020-03-10 08:30:43 2020-03-10 08:30:56 2022-08-26 03:52:27 0000-00-00 00:00:00 2020 0 Ljubljana 0 XXI, 51 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 629.7.062:629.7.025(043.2) 220059 17088539 4908.pdf 4908.pdf 1 28E0D01901CCBB63B0A763A13E36CCA7 6a7a64c49a68bdd08aae6be067764cf06cd89af96519a31071d74d2716af3b99 441fa0ee-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=127075 Fakulteta za strojništvo 0 0 0