In order to study dynamic characteristics of catapult launch for a carrier-based aircraft, a simplified dynamic model of catapult launch with sudden load discharge of nose gear was constructed. Fast vibration in the vertical direction of nose gear caused by the sudden discharge of the holdback load in the beginning of catapult launch was studied, and the dynamic reason of this phenomenon was analyzed. The rules of fast extension of nose landing gear caused by the sudden discharge of the catapult bridle load at the end of catapult launch was researched, and the influence of all parameters on the extension of nose landing gear was analyzed. Two important conclusions were obtained: in order to reduce the vibration peak value of the strain of nose landing gear during catapult launch, the holdback and catapult bridle lengths should be increased appropriately, and the maximum holdback breaking load is suggested to increase properly. Secondly, in order to decrease the difficulties of catapult launch, the catapult bridle length is recommended to decrease moderately.%为了分析舰载机弹射起飞过程中的动力学特点,建立了一种考虑前起落架载荷突卸的弹射起飞动力学模型.研究了在弹射开始时由于牵制载荷突卸而引起的前起落架沿着垂直方向的快速振动现象,并分析了该现象的动力学成因；研究了在弹射末端由于弹射杆载荷突卸而引起的前起落架的快速突伸规律,分析了各种参数对前起落架突伸的影响.结果分析表明:为了减小前起落架支柱受力的波动峰值,应适当增加弹射杆长度和牵制杆长度,及牵制杆最大破坏力值；但为了降低弹射起飞难度,应适当减小弹射杆长度.
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