A newly designed decoupling method for micro-Newton thrust measurement.
A newly designed decoupling method for micro-Newton thrust measurement.
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DOI：
10.1063/5.0120130
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Hao Xu;Qiangbing Mao;Yong Gao;Liqiu Wei;Yongjie Ding;H. Tú;Peiyi Song;Zhongkun Hu;Qing Li
中科院分区：
文献类型：
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作者：
Hao Xu;Qiangbing Mao;Yong Gao;Liqiu Wei;Yongjie Ding;H. Tú;Peiyi Song;Zhongkun Hu;Qing Li
提出了一种扭摆微牛顿推力测量的解耦方法。基本方法是减少推进器推进剂管和电线带来的影响。空心铝管用于悬挂扭摆，也被选为推进器推进剂的输送管。推进器的电控箱安装在摆体上，通过液态金属导电单元由外部安装的电源供电。电控箱的控制通过无线传输进行。通过这种设计，减少了推进剂管以及扭摆与外部装置之间的连接线的影响，提高了系统扭簧常数的稳定性。液态金属导电单元的使用减少了导线与测量系统之间的耦合。分析了无线传输的可行性。分析了推力测量过程中的误差来源，得出冷气推进器测量推力的预期三σ不确定度为0.032+(0.10%*F)2μN。该方案提供了精度更高、稳定性更高的推力测量。
A decoupling method is proposed for micro-Newton thrust measurement with a torsion pendulum. The basic approach is to reduce the influences introduced by the propellant tube and wires of the thruster. A hollow aluminum tube is used to hang the torsion pendulum and is also chosen as the transport pipe for the propellant of the thruster. The electric control box of the thruster is mounted on the pendulum body, which is powered by an externally installed power supply through a liquid metal conductive unit. The control of the electric control box is performed through wireless transmission. With this design, the influences of the propellant tube and connection wires between the torsion pendulum and the outside device are reduced and the stability of the torsion spring constant of the system can be improved. The use of the liquid metal conductive unit reduces the coupling between the wires and the measurement system. The feasibility of the wireless transmission is analyzed. The error sources during the thrust measurement are analyzed, and the expected three σ uncertainty of the thrust is 0.032+(0.10%*F)2μN for the measurement of the cold gas thruster. The scheme provides a thrust measurement with higher precision and stability.