Switching Control for Guaranteeing the Safety of a Tethered Satellite
Switching Control for Guaranteeing the Safety of a Tethered Satellite
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DOI：
10.2514/1.16552
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发表时间：
2006-07
影响因子：
2.6
通讯作者：
Masamitsu Okazaki;T. Ohtsuka
中科院分区：
文献类型：
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作者：
Masamitsu Okazaki;T. Ohtsuka
绳系卫星系统中存在着许多问题，如系绳被空间碎片切断的危险，以及由于系绳的柔性而难以分析。此外，由于系绳不能被推动，在系留卫星的部署和回收期间，控制张力被约束为非负的。因此，很难保证系留卫星不会与母船相撞，也很难保证系留卫星不会与母船纠缠。提出了一种保证绳系卫星安全性的方法。为了使系留卫星安全运行，同时避免上述情况，切换控制算法的卫星部署和回收。系绳既没有质量也没有灵活性的模型被用来构建一个开关控制算法。因为当无量纲输入为常数时，该模型是线性的，所以可以解析地导出保证安全的条件。然后，将获得的条件应用于具有系绳具有质量和柔性的模型的仿真，以显示用于保证安全的条件的有效性。标称A =系绳横截面，m 2 d =虚拟输入E =系绳杨氏模量，N/m 2 F（s，t）=系绳中的弹性力矢量F �（s，t）=系绳中的阻尼力矢量G =重力常数，m 3 · kg −1 · s −2 In
There are many problems in a tethered satellite system, such as the danger of the tether being cut by space debris and difficulty in analyzing the tether because of its flexibility. Moreover, because a tether cannot be pushed, control tension is constrained to be nonnegative during deployment and retrieval of the tethered satellite. Therefore, it is difficult to guarantee that the tethered satellite will not collide with the mother ship or that the tether will not entangle itself with the mother ship. A method is proposed to guarantee the safety of a tethered satellite. To operate a tethered satellite safely while avoiding the situations described, a switching control algorithm is constructed for satellite deployment and retrieval. A model in which the tether has neither mass nor flexibility is used to construct a switching control algorithm. Because this model is linear when the dimensionless input is constant, conditions for guaranteeing safety can be derived analytically. Then, the obtained conditions are applied to a simulation with a model in which the tether has mass and flexibility to show the validity of the conditions for guaranteeing safety. Nomenclature A = cross section of tether, m 2 d = dummy input E = Young’s modulus of tether, N/m 2 F(s, t) = elastic force vector in tether F � (s, t) = damping force vector in tether G = gravitational constant, m 3 · kg −1 · s −2 In