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着陆是载人航天活动的关键环节,对返回舱在接近地面时的带伞着陆过程分析具有重要意义。该文对显式积分有限元软件LS-DYNA的ALE方法进行了初步研究,探讨了其中关键控制参数对计算结果的影响。用该方法建立了返回舱带伞着陆的有限元模型,包含空气、降落伞和返回舱,用相关试验数据对模型的有效性进行了验证。结果表明,计算得到的舱体速度和姿态角与试验结果基本吻合,建立的模型可用于返回舱带伞着陆过程特性分析、着陆工况确定和降落伞对着陆冲击的影响等问题的研究。
Landing is a key part of manned space activities, which is of great significance to the parachute landing analysis when the return capsule is close to the ground. In this paper, the ALE method of explicit integral finite element software LS-DYNA is studied and the influence of the key control parameters on the calculation results is discussed. A finite element model of landing landing with parachute landing was established by this method, including air, parachute and return capsule. The validity of the model was verified by relevant experimental data. The results show that the calculated velocity and attitude angle are in good agreement with the experimental results. The established model can be used to study the characteristics of the landing process, the determination of the landing condition and the impact of the parachute on the landing impact.