菲莱航天器在67 P/Churyumov-Gerasimenko彗星着陆期间旋转运动的部分再现
Partial reconstruction of the rotational motion of Philae spacecraft during its landing on comet 67P/Churyumov-Gerasimenko
摘要：
本文介绍了一个部分重建的旋转动力学的菲莱航天器着陆后彗星67 P/Churyumov-Gerasimenko作为欧空局的罗塞塔任务的一部分。我们分析的运动和事件所引发的失败，以固定在彗星表面的第一次着陆时的航天器。通过对航天器的7自由度机械模型进行数值模拟获得的动态轨迹与从太阳能电池板提供的电功率的现场测量推断的入射太阳辐射方向相吻合。结果包括着陆器在第一次着陆后立即的角速度的下限。我们的研究还深入了解了着陆后稳定陀螺仪的程序关闭的影响;菲莱的旅程中的小碰撞的重要动力学后果;以及类似的着陆场景损害这种类型的航天器的可操作性的可能性。
英文摘要：
This paper presents a partial reconstruction of the rotational dynamics of the Philae spacecraft upon landing on comet 67P/Churyumov-Gerasimenko as part of ESA's Rosetta mission. We analyze the motion and the events triggered by the failure to fix the spacecraft to the comet surface at the time of the first touchdown. Dynamic trajectories obtained by numerical simulation of a 7 degree-of-freedom mechanical model of the spacecraft are fitted to directions of incoming solar radiation inferred from in-situ measurements of the electric power provided by the solar panels. The results include a lower bound of the angular velocity of the lander immediately after its first touchdown. Our study also gives insight into the effect of the programmed turn-off of the stabilizing gyroscope after touchdown; the important dynamical consequences of a small collision during Philae's journey; and the probability that a similar landing scenario harms the operability of this type of spacecraft.
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