Control performance simulation and tests for Microgravity Active vibration Isolation System onboard the Tianzhou-1 cargo spacecraft

Liu, Wei; Zhang, Yongkang; Li, Zongfeng; Dong, Wenbo

doi:10.1007/s42064-018-0028-7

Cited by 18 publications

(3 citation statements)

References 22 publications

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“…It also shows that u is the control signal of the system, k and c stand for the system's stiffness and damping, respectively. Similar to [20,35], the proposed nonlinear active vibration isolation system can be…”

Section: Dynamic Modelingmentioning

confidence: 99%

Finite-time adaptive control for microgravity vibration isolation system with full-state constraints

Wang

et al. 2023

Preprint

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This article proposes a finite-time adaptive control strategy for a class of vibration isolation systems with external disturbances and full-state constraints. Time-varying barrier Lyapunov functions (TBLFs) are designed to achieve suppression performance under limited rattle space. Adaptive laws are applied to deal with parameters uncertainty which is caused by various mass and momentum. By regarding internal coupling terms and external disturbances as lumped disturbances, a predefined-time observer is employed to handle them. Furthermore, command filters are used to remove the burdens of the computational explosion. With the aid of auxiliary system, command filters errors are eliminated. And the actuator saturation is addressed by auxiliary system as well. By using the finite-time Lyapunov stability theory, it proves that all the states converge in finite time. Finally, simulations are given to verify the effectiveness and benefits of the developed control strategy with a trade-off between the improved suppression performance, limited mechanical constraints and robustness.

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Section: Dynamic Modelingmentioning

confidence: 99%

Finite-time adaptive control for microgravity vibration isolation system with full-state constraints

Wang

et al. 2023

Preprint

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“…Four two-dimensional (2D) position sensitive devices (2D-PSDs) and eight one-dimensional (1D) electromagnetic actuators are configured between the stator and floater. In addition, electromagnetic levitation control is obtained by mounting three 2-axis accelerometers on the floater and one 3-axis accelerometer on the stator, as described in a previous report 10 . Details regarding the measurement sensors and actuators employed in the control system are listed in Table 2, where the response frequency of the sensors refers to their measurement frequency, while that of actuators refers to their output frequency.…”

Section: Hardware Architecturementioning

confidence: 99%

Flight test results for the Microgravity Active Vibration Isolation System employed in the Fluid Physics Research Rack on-board the Chinese Space Station

Liu,

Gao,

Zhang

et al. 2023

Preprint

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The Fluid Physics Research Rack (FPR) is a research platform employed on-board the Chinese Space Station for conducting microgravity fluid physics experiments. The research platform includes the Microgravity Active Vibration Isolation System (MAVIS) for isolating the FPR from disturbances arising from the space station itself. In addition, the MAVIS includes a microgravity operating mode that provides an environment with a controllable acceleration on the order of one millionth of the gravitational acceleration of the earth at sea level (i.e., µg0, where g0 = 9.80665 m/s2), and a vibration excitation operating mode that provides an environment with controllable vibrational acceleration signals of specific amplitudes in the frequency range of 0.01–10 Hz. The MAVIS is a structural platform consisting of a stator and floater that are monitored and controlled with non-contact electromagnetic actuators, high-precision accelerometers, and displacement transducers. The stator is fixed to the FPR, while the floater serves as a vibration isolation platform supporting payloads, and is connected with the stator only with umbilicals that mainly comprise power and data cables. However, the umbilicals have some stiffness that provides pathways for the transfer of disturbances from the stator to the floater. Therefore, the controller was designed with a correction for the umbilical stiffness to minimize the effect of the umbilicals on the vibration isolation performance of the MAVIS. In-orbit test results of the FPR demonstrate that the MAVIS was able to achieve a microgravity level of 1–30 µg0 in the frequency range of 0.01–125 Hz under the microgravity mode, and disturbances with a frequency greater than 2 Hz are attenuated by more than 10-fold. Under the vibration excitation mode, the MAVIS generated a minimum vibration acceleration of 0.4091 µg0 at a frequency of 0.00995 Hz and a maximum acceleration of 6253 µg0 at a frequency of 9.999 Hz. Therefore, the MAVIS provides a highly stable environment for conducting microgravity experiments, and promotes the development of microgravity fluid physics.

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“…Simulation and test results verify the accuracy of the control strategy design, effectiveness of the control algorithms, and performance of the entire control system. The details of these simulation and tests could be found in an earlier paper (Liu et al 2018).…”

mentioning

confidence: 99%

Flight Test Results of the Microgravity Active Vibration Isolation System in China’s Tianzhou-1 Mission

Liu

Dong

2018

Microgravity Sci. Technol.

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The Microgravity Active vibration Isolation System (MAIS) was operated on China's first cargo-spacecraft Tianzhou-1, which was launched on April 20, 2017 and re-entered atmosphere and burned on September 22, 2017. In this article, the flight test results of MAIS is presented. The results are evaluated in terms of the performances of microgravity acceleration and vibration attenuation under control. Firstly, the system configuration of MAIS on Tianzhou-1 is described, including operating modes, acceleration measurement, and control schemes. Then, two control performance indices, namely, microgravity acceleration and vibration attenuation, are introduced, followed by their definitions and methods of calculation. Subsequently, the flight test results of MAIS are described in detail. The microgravity acceleration under a PID (Proportional-Integral-Derivative) controller is at the order of 10 −7-10 −6 m/s 2 in the frequency band of 0.01-10 Hz, and the performance of vibration attenuation reaches −20 dB at frequencies higher than 0.2 Hz. The flight test results show that MAIS in the TZ-1 mission performed well and achieved the expected control performance of microgravity vibration isolation in orbit. Finally, some experiences and lessons learned are summarized, which can serve as a benchmark reference to develop MAIS-like devices on board China's Space Station in the near future.

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Control performance simulation and tests for Microgravity Active vibration Isolation System onboard the Tianzhou-1 cargo spacecraft

Cited by 18 publications

References 22 publications

Finite-time adaptive control for microgravity vibration isolation system with full-state constraints

Finite-time adaptive control for microgravity vibration isolation system with full-state constraints

Flight test results for the Microgravity Active Vibration Isolation System employed in the Fluid Physics Research Rack on-board the Chinese Space Station

Flight Test Results of the Microgravity Active Vibration Isolation System in China’s Tianzhou-1 Mission

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