拦阻索冲击的多体动力学仿真研究

舰载机着舰时，尾钩冲击拦阻索导致索内应力动态向甲板两端传播。为研究拦阻索应力波传播规律及峰值决定因素，本文在多体动力学框架下，发展了基于绝对节点坐标法的具有接触碰撞功能的大位移索单元，在此基础上建立了包含缓冲装置的拦阻系统多体动力学模型，仿真揭示了拦阻索受冲击后应力波在传播过程中，分别在甲板两侧的导向轮和尾钩处，因横波的反射与叠加均造成了应力尖峰，而滑轮缓冲装置与钢索末端缓冲装置均能有效的降低索内应力峰值。拦阻系统中的钢索用轻质材料代替，亦能降低索内应力峰值。此外，本文建立的全尺寸舰载机拦阻系统多体动力学模型为系统的设计与优化提供了一种计算手段。

Multi-body Dynamic Simulation of the Impact on Cross Deck Pendant

When aircraft is landing on carrier, the impact stress, generated at the moment of tail-hook arresting cross deck pendant, propagates to both ends of the wire rope. To simulate and understand the governing law of this stress wave, a cable element with contact and large displacement functionality was developed in this paper based on absolute nodal coordinate formulation under the framework of multi-body dynamics. And then a multi-body dynamic model of the whole arresting system was built. The results of simulation show that stress peaks are caused by reflection and superposition of transverse wave at deck sheaves and carrier-based aircraft tail-hook, after tail-hook arrests the cross deck pendant. The study further shows that damper sheave installation can reduce stress peak effectively, and replace the rope with lightweight material will also weak the stress peak. Besides, the multi-body model of full-size arresting system built here provides an effective simulation way to assist the design and optimization work of the whole arresting system.