Scholarlink

<p>For sensitive payloads in satellites, microvibration is a cause of significant performance degradation. The Control Moment Gyro (CMG), an attitude control device for agile satellites, generates microvibration due to imbalance and irregularities in its high-speed flywheel. As the satellite body transmits microvibration to the sensitive payloads due to its low damping characteristics, it is imperative to isolate microvibration at the source. In this study, a hexapod microvibration isolator based on the Stewart platform is proposed with an alternative configuration. This alternative configuration, originally proposed to reduce coupling transmissibility, is adopted to provide stable performance across a broad frequency range with less weight compared to the widely used cubic configuration in Stewart platform microvibration applications. Modal analysis showed that the alternative configuration is stiffer compared to the cubic configuration. The performance of the isolator was experimentally tested with a high-torque CMG. The proposed hexapod microvibration isolator with an alternative configuration successfully isolated microvibration from the CMG without severe performance degradation.</p>

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Alternative Stewart Platform Configuration for the Enhanced Isolation of CMG-Induced Microvibration

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月4日

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  • Bawoul Chung,
  • Jong-Kuk Lee,
  • Tae-Seong Song,
  • Deok-ki Song,
  • Jae-Hung Han

摘要

For sensitive payloads in satellites, microvibration is a cause of significant performance degradation. The Control Moment Gyro (CMG), an attitude control device for agile satellites, generates microvibration due to imbalance and irregularities in its high-speed flywheel. As the satellite body transmits microvibration to the sensitive payloads due to its low damping characteristics, it is imperative to isolate microvibration at the source. In this study, a hexapod microvibration isolator based on the Stewart platform is proposed with an alternative configuration. This alternative configuration, originally proposed to reduce coupling transmissibility, is adopted to provide stable performance across a broad frequency range with less weight compared to the widely used cubic configuration in Stewart platform microvibration applications. Modal analysis showed that the alternative configuration is stiffer compared to the cubic configuration. The performance of the isolator was experimentally tested with a high-torque CMG. The proposed hexapod microvibration isolator with an alternative configuration successfully isolated microvibration from the CMG without severe performance degradation.