Based on the mathematical model of ramp profile,undercarriage and carrier-based aircraft,the numerical simulation of ski-jump take off of carrier-based aircraft was carried on.The change process of undercarriage loads was researched.The effect of three factors on undercarriage was well studied,including the distance of running,quality of flight and ramp profile.Simulation results showed the undercarriage loads fluxed when aircraft taking off through ramp deck.The quantity of undercarriage loads could be influenced by the distance of running and quality of flight,but the fluctuation of loads could not be influenced by these factors.The effect of ramp profile to undercarriage loads showed in two aspects,first,the quantity of loads could be changed by ramp profile; second,the fluctuation of loads could be slowed down by the adjustment of ramp profile.
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