Impact of Strain-Actuated Attitude Control Systems for Variant Mission Classes
Impact of Strain-Actuated Attitude Control Systems for Variant Mission Classes
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发表时间：
2019
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通讯作者：
A. Ghosh;O. Alvarez-Salazar;James T. Allison
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作者：
A. Ghosh;O. Alvarez-Salazar;James T. Allison
伊利诺伊大学与美国宇航局喷气推进实验室(JPL)和美国宇航局艾姆斯研究中心合作，开发了一种名为应变驱动太阳能阵列(SASA)的新型姿态控制系统(ACS)，具有亚毫角秒的指向能力。SASA使用产生应变的致动器使灵活的可展开结构变形，由此产生的反作用力使卫星旋转。这种动量传递策略用于减少抖动和小角度回转机动。该系统目前处于4-5级的技术准备水平，并即将在CAPSat CubeSat任务上进行演示飞行。SASA概念的一个扩展，称为姿态控制多功能结构(MSAC)，除了抖动消除外，还可以实现任意大角度的摆动机动。MSAC有可能取代姿态控制系统中的反作用轮和控制力矩陀螺仪，从而消除抖动噪声的一个关键来源。SASA和MSAC都更可靠，因为与传统的ACS相比，故障模式更少，故障率更低，同时总体上具有更小的质量、体积和功率预算。本文讨论了SASA和MSAC在广泛的航天器和不同的任务类别中使用的优势。
The University of Illinois, in collaboration with NASA Jet Propulsion Laboratory (JPL) and NASA Ames Research Center, has developed a novel Attitude Control System (ACS) called the Strain Actuated Solar Arrays (SASA), with sub-milli-arcsecond pointing capability. SASA uses strain-producing actuators to deform flexible deployable structures, and the resulting reaction forces rotate the satellite. This momentum transfer strategy is used for jitter reduction and small-angle slew maneuvers. The system is currently at a Technology Readiness Level of 4-5 and has an upcoming demonstration flight on the CAPSat CubeSat mission. An extension to the SASA concept, known as Multifunctional Structures for Attitude Control (MSAC), enables arbitrarily large-angle slew maneuvers in addition to jitter cancellation. MSAC can potentially replace reaction wheels and control moment gyroscopes for attitude control systems, thereby eliminating a key source of jitter noise. Both SASA and MSAC are more reliable because of fewer failure modes and lower failure rates as compared to conventional ACS, while having an overall smaller mass, volume, and power budget. The paper discusses the advantages of using SASA and MSAC for a wide range of spacecraft and variant mission classes.