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Strojarstvo : časopis za teoriju i praksu u strojarstvu, Vol. 51 No. 6, 2009.

Preliminary communication

Numerical Simulation of Landing Aircraft Dynamics

Zdravko TERZE ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia
Milan VRDOLJAK ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia
Hinko WOLF ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia

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Abstract

Numerical simulation procedures for landing dynamics of large transport
aircraft are briefly presented. Developed numerical procedures allow for
determination of dynamic response of landing aircraft for different flight and
touch-down parameters. A non-linear dynamic model of landing aircraft,
which serves as a basis for computational procedures, is synthesised by
modelling of aircraft structural subsystems using a multibody dynamics
approach. A dynamic model with variable kinematical structures includes
discontinuous dynamics of landing gear oleo-pneumatic shock-absorber
with friction and hydraulic/thermodynamic processes. Non-linear tire
contact dynamics and unilateral dynamics of nose gear elastic leg
assembly is modelled as well. The longitudinal and lateral aerodynamic
loads are estimated by considering various aircraft system configurations
(landing gears in “up’’ and “down’’ position, different control surfaces in
active/inactive modes). A mathematical model is derived as a 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 dynamic
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 with focus on determination of dynamical
loading of main landing gear assembly.

Keywords

Aircraft multibody model; Dynamics of landing aircraft; Non-linear landing gear dynamics; Shock-absorber model

Hrčak ID:

56786

URI

https://hrcak.srce.hr/56786

Publication date:

31.12.2009.

Article data in other languages: croatian

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