| 吕锦锋,梁元,谭申刚.大型运输机水上迫降动力学分析及模型验证[J].装备环境工程,2020,17(9):154-159. LYU Jin-feng,LIANG Yuan,TAN Shen-gang.Ditching Simulation and Model Test Technology of Large Transport Aircraft[J].Equipment Environmental Engineering,2020,17(9):154-159. |
| 大型运输机水上迫降动力学分析及模型验证 |
| Ditching Simulation and Model Test Technology of Large Transport Aircraft |
| 投稿时间：2020-07-02 修订日期：2020-07-19 |
| DOI：10.7643/issn.1672-9242.2020.09.027 |
| 中文关键词: 大型运输机 水上迫降 吸力 模型试验 |
| 英文关键词:large transport aircraft ditching suction force model test |
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| 中文摘要: |
| 目的 完善大型运输机水上迫降分析方法，提高分析精度。方法 以有限元和SPH方法为基础，开展大型运输机水上迫降动力学仿真。基于冯.卡门经典入水冲击理论，构造大型运输机机身底部吸力模型，提出基于工程修正的水上迫降动响应分析方法，并通过试验验证。结果 通过分析得出，飞机接水后，机头迅速上扬，俯仰角达到峰值后，机头向下运动，俯仰角逐渐减小，分析得到的飞机姿态变化与试验的变化趋势基本一致。结论 水上迫降模型试验表明，分析误差能够满足工程设计要求。 |
| 英文摘要: |
| The work aims to improve the methods of ditching simulation and increase the analysis precision. Based on the SPH and finite element methods, ditching simulation of large transport aircraft was carried out. Based on the Von Karman’s classical water-impact theory, the mathematic model of the suction force acting on the rear part of the aircraft was constructed and the response analysis method of ditching based on engineering correction was proposed and verified by experiments Through the analysis, the pitch angle of the aircraft increased to the peak quickly as the nose rose when the aircraft crashed on the water and then the nose moved toward the water surface with the pitch angle decreasing gradually. The change trend of the attitude angle of aircraft between simulation and test was consistent. The analytical error obtained from the ditching simulation can meet the requirements of engineering design. |
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