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A two-stage torsion pendulum to test AC control actuator of space inertial sensor for Tianqin.

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Title:	A two-stage torsion pendulum to test AC control actuator of space inertial sensor for Tianqin.
Authors:	Jiang, Yiyan¹ (AUTHOR), Lu, Jinfeng¹ (AUTHOR), Ouyang, Chaoli¹ (AUTHOR), Zhou, Hongtao¹ (AUTHOR), Hu, Ming¹ (AUTHOR), Liu, Li¹ (AUTHOR), Wu, Shuchao¹ (AUTHOR) scwu@hust.edu.cn, Zhou, Zebing¹ (AUTHOR) zhouzb@hust.edu.cn
Source:	Measurement Science & Technology. Jan2026, Vol. 37 Issue 4, p1-11. 11p.
Subjects:	Electrostatic actuators, Inertial navigation systems, Pendulums, Sensitivity analysis, Multi-degree of freedom, Gravitational wave detectors
Abstract:	To realize the free falling test mass (TM) in gravitational wave detection in space, an alternative current (AC) electrostatic control strategy is proposed and developed. It is significant to test and verify the AC control actuation scheme on the ground. In this paper, a two-stage torsion pendulum is used to test the performance of the AC control actuator of inertial sensor for Tianqin project. First, the pendulum facility combined with a TM, a capacitive position sensor and an AC control actuator is constructed. Experimental results show that the sensitivities of the pendulum achieve 4.2 × 10−11 N Hz−1/2 at 6 mHz and 1.6 × 10−13 Nm Hz−1/2 at 15 mHz, respectively, and the pendulum provides a chance to realize the performance test of two degree-of-freedom sensitivities of the actuator, experimental verification of AC control strategy and so on, which is first reported to test performance of the AC control actuator of a space inertial sensor on the ground. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	To realize the free falling test mass (TM) in gravitational wave detection in space, an alternative current (AC) electrostatic control strategy is proposed and developed. It is significant to test and verify the AC control actuation scheme on the ground. In this paper, a two-stage torsion pendulum is used to test the performance of the AC control actuator of inertial sensor for Tianqin project. First, the pendulum facility combined with a TM, a capacitive position sensor and an AC control actuator is constructed. Experimental results show that the sensitivities of the pendulum achieve 4.2 × 10−11 N Hz−1/2 at 6 mHz and 1.6 × 10−13 Nm Hz−1/2 at 15 mHz, respectively, and the pendulum provides a chance to realize the performance test of two degree-of-freedom sensitivities of the actuator, experimental verification of AC control strategy and so on, which is first reported to test performance of the AC control actuator of a space inertial sensor on the ground. [ABSTRACT FROM AUTHOR]
ISSN:	09570233
DOI:	10.1088/1361-6501/ae2b29