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Soft Magnets for Passive Attitude Stabilization of Small Satellites

机译：软磁铁用于小型卫星的被动姿态稳定

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摘要

The spinning and oscillatory motions of small orbiting satellites can be damped exploiting the magnetic energy dissipation occurring in onboard soft magnetic strips, cyclically excited by the oscillation of the earth field component along their axis. In this paper we investigate the role played by the intrinsic magnetic properties of the material, the aspect ratio of the strips, and their mutual arrangement in achieving maximum energy dissipation under typical spacecraft working conditions. Grain-oriented Fe-Si, mumetal, and Fe-based amorphous alloys, all endowed with near-rectangular hysteresis loops, are considered. Their energy loss behaviour is calculated when, either as single strip samples or arranged into an array of strips, they are subjected to a slowly oscillating magnetic field of defined peak value, emulating the action of the earth magnetic field on the travelling satellite. The strip size and array layout leading to maximum energy loss are predicted. Amorphous alloys, combining high saturation magnetization with flexible hysteresis loop properties, are shown to lead to the best damping behaviour under both oscillating and spinning satellite motions. In the latter case the Fe-Si strips appear to provide comparably high damping effects, while inferior behaviour is always predicted with mumetal samples.
机译：可以利用机载软磁条中发生的磁能耗散来衰减小型轨道卫星的自旋和振荡运动，这些磁能耗散是由地球场分量沿其轴的振动而周期性地激发的。在本文中，我们研究了材料的固有磁性，条带的纵横比及其相互排列在典型航天器工作条件下实现最大能量耗散中所起的作用。考虑到晶粒取向的Fe-Si，mumetal和Fe基非晶合金，都具有接近矩形的磁滞回线。当它们作为单个条带样本或布置成条带阵列时，它们受到定义的峰值的缓慢振荡磁场的影响，从而模拟地磁场对行进卫星的作用，从而计算出它们的能量损耗行为。可以预测导致最大能量损失的条带尺寸和阵列布局。非晶态合金结合了高饱和磁化强度和灵活的磁滞回线特性，在振荡和旋转的卫星运动下均表现出最佳的阻尼性能。在后一种情况下，Fe-Si条带似乎提供了相对较高的阻尼效果，而粘金属样品始终会预测其不良性能。

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