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首页> 外文期刊>Journal of Spacecraft Technology >Design of a Dynamically Isotropic Stewart-Gough Platform for Passive Micro-Vibration Isolation in Spacecraft using Optimization
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Design of a Dynamically Isotropic Stewart-Gough Platform for Passive Micro-Vibration Isolation in Spacecraft using Optimization

机译：利用优化设计宇宙飞船中被动微振隔离动态各向同性斯图尔特平台的设计

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摘要

Stewart-Gough platform (SGP), a six-degree-of-freedom device that has been used extensively for isolating sensitive payload from micro-vibrations in spacecraft. In this paper, we propose a design where the first six modal frequencies are close to each other, for a predefined payload, thus enabling development of effective vibration isolation for all six primary modes. The equations of dynamics of the 6-6 semi-regular SGP is obtained in terms of five geometric variable and position of the center of the mass of the combine top platform and the payload. A gradient-based optimization is used to obtain these dimensions of a SGP such that the first six modal frequencies are close to each other - the ratio of the maximum to the minimum natural frequency was obtained as 1.70 and 1.31 when torsional mode was excluded, respectively. A detailed analysis, including the effects of a typical payload and actuator inertia, was performed. Based on the obtained design, a prototype Stewart-Gough vibration isolator was manufactured and experiments with the prototype show that the observed ratio of the maximum to the minimum natural frequency, excluding the torsional mode, was 1.50.
机译：Stewart-Gough平台（SGP），一种自由度的六自由装置，用于广泛用于从航天器中的微振动中隔离敏感有效载荷。在本文中，我们提出了一种设计，其中前六个模态频率彼此接近，用于预定义有效载荷，从而能够为所有六种主要模式开发有效的振动隔离。 6-6半常规SGP的动态方程是根据五个几何变量和组合顶部平台和有效载荷的质量中心的位置获得的。使用基于梯度的优化来获得SGP的这些尺寸，使得第一六个模态频率彼此接近 - 当排除扭转模式时，最大到最小自然频率的比率为1.70和1.31 。进行了详细的分析，包括典型有效载荷和致动器惯性的效果。基于所获得的设计，制造原型斯图尔特 - 毒丸隔振器，并用原型的实验表明，观察到的比率与扭转模式不包括扭转模式的最小固有频率为1.50。

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