engleski

Dynamic Simulator for Numeric Analysis of Landing Transport Aircraft

. Dynamical model and numerical procedures for dynamic simulation of landing and taxi of large transport aircraft are shortly presented. The simulator allows for dynamic response determination of landing aircraft for different flight and touch-down parameters. The mathematical model and computational procedures are based on non-linear dynamical model of landing aircraft, which is synthesised via modelling of aircraft structural subsystems using multibody dynamics approach. The model includes discontinuous dynamics of landing gear oleo-pneumatic shock-absorber with friction and hydraulic/thermodynamic processes as well as non-linear tire contact dynamics and unilateral dynamics of nose gear elastic leg assembly. The longitudinal and lateral aerodynamic loads are estimated by considering aircraft various system configurations (landing gears in up and down position, different control surfaces in active/inactive modes). ‘ Solver' of dynamic simulator is based on the numerical processing of nonlinear dynamics of aircraft structural subsystems with variable kinematical structure, derived as differential-algebraic (DAE) system. The developed numerical tools are modularly shaped and efficient numerical integration methods, as well as original procedures for MBS constraint stabilization, are applied for dynamical response determination. On the basis of the presented model, dynamic simulations of landing cases of large transport aircraft were performed for different initial descent velocities and different lateral wind conditions.

: Dynamics of Landing aircraft; Aircraft Multibody Model; Non-linear Landing Gear Dynamics; Shock Absorber Model

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