中国空间科学技术

中国空间科学技术 ›› 2024, Vol. 44 ›› Issue (6): 154-163.doi: 10.16708/j.cnki.1000-758X.2024.0100

• 论文 • 上一篇    下一篇

集成化的竖直摆式微推力测试台及其性能

涂海波1,*, 崔潜1,2, 孙恒1,2, 刘坤1,2, 柳林涛1   

  1. 1.中国科学院 精密测量科学与技术创新研究院，武汉430077.
    2.中国科学院大学 地球与行星科学学院，北京100049.
  • 收稿日期:2023-07-20 修回日期:2023-09-21 录用日期:2023-11-08 发布日期:2024-12-03 出版日期:2024-12-05

An integrated weak thrust stand based on vertical pendulum and its performance characteristics

TU Haibo1,*，CUI Qian1,2，SUN Heng1,2， LIU Kun1,2， LIU Lintao1   

  1. 1.Innovation Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences，
    Wuhan 430077,China
    2.College of Earth and Planetary Sciences，University of Chinese Academy of Sciences，Beijing 100049，China
  • Received:2023-07-20 Revision received:2023-09-21 Accepted:2023-11-08 Online:2024-12-03 Published:2024-12-05

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摘要： 在地面测试微推进器的推力时，由于受到地表的重力加速度和环境振动等因素的限制，使得高精度的推力测量和标定十分困难，需要专门设计精密的推力测试台并对其受扰动的特性及抑制方法进行研究。介绍了根据水平轴扭摆的原理实现的一种精度和量程可调的集成化的竖直扭摆式（VP型）微推力测试台。该测试台运用差分测量方法，进行了整体探头小型化和线缆集成化设计，有效抑制了环境噪声，提高了稳定性和使用便利性，同时进行了程控重力和电磁力标定。测试表明，在普通实验室环境下，测试台在精细模式下的分辨率可达10nN，频谱噪声达到10nN/Hz1/2@10mHz, 量程达到1mN；通过开关转换到大量程下的测量范围达300mN以上，负载330g时的响应带宽为DC-10Hz，测量的相对精度达到1%，可满足各种类型的高精度或大推力微推进器在地面的推力标定和性能测试需求。

关键词: 推进器, 推力测试台, 微推力标定, 竖直扭摆, 差分测量

Abstract: Micro-thruster is one of key payloads on high precision satellites. It is meaningful to pretest their thrusts in advance on ground. However, it is of difficulty to measure the thrust below micro-Newton on ground due to factors such as gravity acceleration and environmental disturbances. An integrated micro-thrust stand based on vertical pendulum (VP) structure is designed, to overcome above restrictions. The stand has an adjustable accuracy and can cover a wide dynamic range, in which the differential measurement method and integrated cable assembly are employed. Its performances are then characterized in common lab environment. The results show that the resolution in a fine mode can reach 10 nN,the spectral noise can reach 10nN/Hz1/2  @ 10mHz and the range reaches 1mN, the measurement range in large range mode can reach 300mN, and the response bandwidth is DC-10Hz when the tested thruster has a mass of 330g. The stand can be calibrated whenever it is needed by both gravitational force and electromagnetic force. It can meet the on-ground test requirements of a variety of micro-thrusters.

Key words: micro-thrusters, thrust stand, micro-thrust calibration, vertical pendulum, differential measurement