Modeling the Effect of One Engine Inoperative for the BADA Flight Performance Model

Rad obrađuje temu utjecaja otkaza jednog motora na performanse višemotornih zrakoplova za vrijeme krstarenja. Cilj je analizirati i usporediti promjenu performansi zrakoplova u letu nakon otkaza motora te predočiti utjecaj pojedinih faktora na promjenu ukupnog otpora zrakoplova kao i njegove putanje leta. Kao jedno od rješenja rada navode se i pojednostavljene korekcije čije je principe moguće primijeniti na dosadašnji model performansi zrakoplova za eventualno unapređenje fleksibilnosti modela. BADA model performansi zrakoplova predstavlja bazu podataka relevantnih za analizu performansi određenog broja zrakoplova kojeg je razvila organizacija EUROCONTROL (European Organisation for the Safety of Air Navigation). Model se koristi uglavnom za potrebe simulacija trajektorija zrakoplova u zračnom prostoru pri kojim je ponašanje zrakoplova vrlo realistično dokle god se zrakoplov nalazi u uobičajenim faza leta, no ne i pri otkazu motora. Let s otkazom motora je specifičan i odudara od normalnih operacija zrakoplova u smislu operativnih ograničenja koje utječu na operativnu efikasnost ali i na samu sigurnost. Korekcija modela napravljena je na primjeru zrakoplova Bombardier Dash 8-Q400, dvomotornog turbo-propelerskog putničkog zrakoplova koji se koristi na manjim udaljenostima. Svi podaci potrebni za izračune crpljeni su iz službene dokumentacije zrakoplova kao što su operativni priručnici, te oni već postojeći iz BADA modela. U početku rada opisani su osnovni principi letenja čije je shvaćanje neophodno za razradu problematike kao i specifičnosti višemotornog (u ovom slučaju propelerskog) letenja. Kao rezultati iznesene su nove vrijednosti pojedinih indikatora perfomansi u obliku grafova i tablica relevantnih podataka za let s otkazom motora.The paper elaborates one engine inoperative flight on multi engine airplanes during cruise. The aim is to analyze and compare changes in aircraft performance after an engine failure in flight, and to show the effects of various factors on total drag of aircraft, as well as the change in flight trajectory. Simplified corrections are also displayed as one result of the paper, which could be applied to the current aircraft performance model eventually for enhanced flexibility. BADA aircraft performance model was made by EUROCONTROL (European Organization for the Safety of Air Navigation) and represents a base of data relevant for aircraft performance. The model is mostly used for simulating aircraft trajectories in airspace where the behavior of aircraft is fairly realistic as long as it flies ordinary regimes, but not so realistic when it comes to engine failures. Flying with an inoperative engine is specific and differs from ordinary operations in terms of operational limits that effect operational efficiency and safety itself. The correction is made using Bombardier Dash 8-Q400 as an example, this is a twin engine turboprop passenger airplane used for regional transport. All the necessary data for calculations were taken from official documents such as aircraft operating manuals and aircraft flight manual, as well as BADA performance model. In the introduction part basic flight mechanic and multiengine flight are elaborated as it is necessary for understanding further calculations. Results are given in form of graphs and tables consisting of relevant data, as well as new values of certain performance factors