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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >MODIFIED STEWART PLATFORM FOR SPACECRAFT THRUSTER VECTOR CONTROL
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MODIFIED STEWART PLATFORM FOR SPACECRAFT THRUSTER VECTOR CONTROL

机译：改进的Stewart平台，用于航天飞机推进器矢量控制

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摘要

Adaptive or intelligent structures which have the capability for sensing and responding to their environment promise a novel approach to satisfying the stringent performance requirements of future space missions. This paper introduces an intelligent modified Stewart platform as an adaptive thruster mount structure with precision positioning and active vibration suppression capabilities for use in space satellites as an intelligent thruster vector control platform. The intelligent thruster mount would utilize piezoelectric sensors and actuators for precision positioning and active vibration suppression to provide fine-tuning of position tolerance for thruster alignment and low transmissibility of vibration to the satellite structure. Similar intelligent platform, introduced here, may be used for sensitive equipment aboard of the spacecraft to suppress the vibration that resonates throughout the spacecraft structure during a thruster firing, solar panel boom opening/reorientation, etc. This vibration renders sensitive optical or measurement equipment non-operational until the disturbance has dissipated. This intelligent system approach would greatly enhance mission performance by fine tuning attitude control, potentially eliminating the non-operational period as well as minimizing fuel consumption utilized for position correction. The configuration of the intelligent thruster mount system is that of a modified Stewart platform. This system is an intelligent tripod with two in-plane rotational degrees of freedom (2-DOF) for the top device-plate. Precision positioning of this structure is achieved using active members that extend or contract to tilt the upper device-plate where the thruster is mounted. An inverse analysis of a modified Stewart platform is employed to determine the required axial displacement of the active struts for the desired angular tilt of the upper device-plate. The active struts can participate in precision positioning as well as vibration suppression of the upper device-plate where the thruster, i.e., the source of the unwanted vibrations and misalignment, is mounted. The proposed Thruster Vector Control (TVC) intelligent platform offers a promising method for achieving fine tuning of positioning tolerances of a thruster as well as minimizing the effects of the disturbances generated during thruster firing in spacecraft such as a satellite.
机译：具有感知和响应周围环境能力的自适应或智能结构有望满足未来太空飞行任务对性能的严格要求。本文介绍了一种智能的改进型Stewart平台，它是具有精确定位和主动振动抑制功能的自适应推进器安装结构，可在空间卫星中用作智能推进器矢量控制平台。智能推进器安装架将利用压电传感器和执行器进行精确定位和主动振动抑制，从而对推进器对准的位置公差和振动对卫星结构的低传递性提供位置公差的微调。此处介绍的类似智能平台可用于航天器上的敏感设备，以抑制在推进器发射，太阳能电池板吊杆打开/重新定向等过程中在整个航天器结构中产生共振的振动。这种振动使敏感的光学或测量设备无法使用-运行，直到干扰消失。这种智能系统方法将通过微调姿态控制来极大地提高任务性能，从而有可能消除非运行时间并最大程度地减少用于位置校正的燃油消耗。智能推进器安装系统的配置是经过修改的Stewart平台的配置。该系统是智能的三脚架，顶部设备板具有两个平面内旋转自由度（2-DOF）。使用活动构件可以延伸或收缩以倾斜安装推进器的上装置板，从而实现此结构的精确定位。对改进的Stewart平台进行反分析，以确定上部装置板的所需角度倾斜所需的主动撑杆轴向位移。主动支柱可参与上推板（即安装有不希望的振动和未对准源）的上设备板的精确定位和振动抑制。拟议中的推力器矢量控制（TVC）智能平台提供了一种有前途的方法，可实现对推力器定位公差的微调，并最大程度地减小卫星等航天器在推力器发射过程中产生的干扰影响。

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