Optimization On Performance Of Landing Gear And Parameters Analysis During Catapult Take-off For Carrier-based Aircraft

Carrier-based Aircraft which catapult take-off from the Aircraft carrier has characteristics ofshort take-off time, large load, complex cases, and requires much higher standard on landing gear thanusual Aircraft which take off from the airport. At present in China, both the Aircraft catapult takeoffperformance and the ship-plane adaption parameters are still in the groping stage. Based on the actualuse cases, a comprehensive study on the landing gear’s parameters are researched in this paper, whichwould provide a reference for the actual use in the near future.According to the specific conditions of take-off and landing, the landing gear’s mathematicalmodels are built, as well as the full Aircraft, which is built as the follow studies’ model.The full Aircraft’s dynamic simulation model is built by ADAMS/Aircraft, and the shape of oilpin which used in main landing gear is optimized. For the nose landing gear which used the doublestage air spring, the shape of the oil pin and the area of the back oil hole are optimized by ISIGHT,which both considered the fast-extension performance and drop performance. Based on theparameters optimized, the low chamber, high chamber and tire’s air pressure are discussed about theirsensitivity on Aircraft’s fast-extension and drop performance. The results show that: the Aircraft’sperformance which optimized are significantly improved, the attack angle of leaving ship increased1.5°, the snubber’s efficiency increased10%and the high chamber’s air pressure get the highestinfluence on Aircraft’s fast-extension performance.Based on the landing gear models optimized, a sum of adaptation parameters’ influence onAircraft’s take-off performance are studied by full Aircraft’s dynamic simulation. The simulationanalysis show that: the large engine thrust force and catapult force have advantages on Aircraft’sleaving speed from the Aircraft carrier, but it would increase the landing gear’s load at the same time.The longer length of the deck will be in favor of the Aircraft’s attack angle while leaving. As theseparameters would affect each other, therefore, the adaptation parameters should be designedspecifically on different case of Aircraft in the actual process.