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1 Journal of KONES

1 2006

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Numerical analysis of a front support landing gear dynamics as the example of chosen MCAD and CAE systems integration in the case of the military transport aircraft design

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Niezgoda T. , Małachowski J. , Budzyński A.

tom Vol. 13, No. 2

341-350

The paper presents the example of MCAD and CAE environments integration in the case of the military transport aircraft front gear dynamic analysis. The gear exact MCAD model is presented with the manner of its simplification. Simplified model is physically similar to the exact one: results of numerical static analysis are the same in both cases. To ensure the credibility of the dynamic analysis, a model kinematics one took place - the gear configuration changed (“airborne” - “airfield”) with the measurements of chosen values. Simulation was verified with the real experiment results. The gear drop test has been simulated with the measurement of the fall-down velocity and absorber displacement. By the progressive results comparison of digital and real experiments, the stiffness-dumping values were attached to the spring/dumper Lagrange elements that simulate the behavior of the absorber gas-oil mixture. The gear model shock sensitivity has been analysed by simulations of landing process with gear invasion through chosen airfield obstructions. Aircraft fall-down velocity can be safely increased by 30% and it can operate on slightly damaged concrete airfields and rough surfaces. The shimmy vibration model sensitivity took place. It is proved that such a phenomenon can’t appear during the correct aircraft maintenance.