Extreme loads calculation following a sudden elevator deflection or vertical gust

• Autorzy: Goraj Z. , Sznajder J.
• Konferencja: Proceedings of the Fourth Seminar on Recent Research and Design Progress in Aeronautical Engineering and its Influence on Education/seminar(IV; 30.11-02.12.2000; Warszawa, Polska)
• Języki publikacji: EN

Abstrakty

EN

Each airplane is not only operated in a level steady flight, but also has to perform a number of manoeuvres. Even for airliner or transport airplane some of these manoeuvres can be rapid and it is the reason that extreme loads generated in such manoeuvres on the tailplane have to be calculated. These loads are responsible for the state of strain, elastic deflection, fatigue and other phenomena. Among different manoeuvres considered in this paper are motions following a sudden deflection of elevator and response to a vertical gust Airplane was assumed to be a rigid body of three degrees of freedom in symmetrical motion. The panel method was used to compute aerodynamic coefficients. Unsteady forces and pitching moment were computed using classical stability derivatives. Elevator deflection was of the step change type, gust was assumed to be either of the step change type or harmonic, with a gust cycle time corresponding to the time to travel a distance equal to 25 Mean Aerodynamic Chord. In all cases a jump type elevator deflection was assumed to last for 1 second, whilst the airplane response as observed for 3 seconds. The airplane motion, its velocities, accelerations and load acting on the tailplane were calculated by means of numerical integration of the ordinary differential equations of motion.

Słowa kluczowe

EN

aircrafts; fluids dynamic; aerodynamics; sudden elevator deflection; vertical gust

PL

samoloty; dynamika płynów; aerodynamika; elewator; wybuch pionowy

• Wydawca: Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology
• Czasopismo: Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics
• Rocznik: 2000
• Tom: nr 10
• Strony: 121--130
• Opis fizyczny: Bibliogr. 10 poz., rys., tab., wykr.

Twórcy

autor

Goraj Z.

autor

Sznajder J.

• Institute of Aviation, Warsaw, Poland