Disturbance Observer-Based Control of Tip-Tilt Mirror for Mitigating Telescope Vibrations

Tang, Tao; Niu, Shuaixu; Chen, Xiaoqiang; Qi, Bo

doi:10.1109/tim.2018.2869437

Cited by 35 publications

(22 citation statements)

References 27 publications

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“…However, most of the controlled objects are strictly proper transfer functions, and the ideal filters are often non-causal systems, which are physically impossible [24]. Thus, the limitations of DOB method restrict its performance, and it cannot provide enough disturbance suppression ability in the low frequency range [25][26][27][28].…”

Section: The Telescope Control Systemmentioning

confidence: 99%

“…C and Deng. J [25][26][27][28], the VMFC with MDF method is not limited by the system's causality and stability restrictions. Although drift still limited the disturbance suppression ability in the low frequency range of the VMFC system, the VMFC with the MDF method can reject much more vibrations in the wider frequency range, which is benefit from its causal ideal feedforward compensator.…”

Section: The Virtual Multi-loop Feedback Control System With Measuredmentioning

confidence: 99%

“…3.439s 2 0.0002s 3 + 1.006s 2 + 29.37s + 1720 (25) After obtaining the nominal plant G a of the controlled object of the AFC loop, we can design the acceleration closed-loop controller C a as shown in Equation (26), in which the inertial link with low cut-off frequency is used to partially weaken the differential link of G a . The controller C a with the inertial link can avoid integral saturation when there is massive drift brought by the MEMS accelerometers.…”

Section: G a (S) =mentioning

confidence: 99%

“…For example, Tang. T introduced the DOB into the position feedback control loop, but it could only improve the disturbance suppression ability at specific low frequencies [25,26]. Deng.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Frequency-Domain Fusion Virtual Multi-Loop Feedback Control System with Measured Disturbance Feedforward Method in Telescopes

et al. 2019

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In the optical telescope, the stable precision of the optical path is affected by the structural vibrations. The image sensor with time delay and the micro electro-mechanical system (MEMS) accelerometer with massive drift limit the disturbance suppression performance of the closed loops. The current control methods cannot reject sufficiently vibrations due to the deficiency of the sensors, causality, and stability restrictions. In this study, the frequency-domain fusion virtual multi-loop feedback control system with measured disturbance feedforward method is proposed to suppress more structural vibrations. In spite of the deficiency of the sensors, we propose the frequency-domain fusion virtual gyroscopes (VGYR) to measure extra velocity of the system. The VGYR is estimated from the MEMS accelerometer with drift and corrected by the image sensor, and it replaces the fiber-optical gyroscopes (FOG) on the fast-stable platform because the weight of FOG is not negligible. To suppress more vibrations, the VGYR and the replaced FOG are utilized to build the virtual multi-loop feedback control system with measured disturbance feedforward, because it is not limited by the causality and stability restrictions. Therefore, the proposed method with causal ideal compensator can effectively improve stable precision and suppress much more structural vibrations in the wider frequency range. Detailed comparative experimental results adequately illustrate the advantages and effectiveness of this method.

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Section: The Telescope Control Systemmentioning

confidence: 99%

Section: The Virtual Multi-loop Feedback Control System With Measuredmentioning

confidence: 99%

Section: G a (S) =mentioning

confidence: 99%

“…For example, Tang. T introduced the DOB into the position feedback control loop, but it could only improve the disturbance suppression ability at specific low frequencies [25,26]. Deng.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Frequency-Domain Fusion Virtual Multi-Loop Feedback Control System with Measured Disturbance Feedforward Method in Telescopes

et al. 2019

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show abstract

“…The disturbance observer has been applied to robotics and industrial automation fields [9]. It is known from experimental research that the disturbance frequency of the optoelectronic stable control platform is usually concentrated in the low-and middle-frequency bands [10]. The three closed-loop feedback control method, which includes the acceleration loop, the velocity loop, and the position loop, is a commonly used method to improve the bandwidth and disturbance rejection capability of the system.…”

Section: Introductionmentioning

confidence: 99%

Three Closed-Loop Feedback Control System with Dual Disturbance Observers of an Optoelectronic Stable Control Platform

et al. 2020

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Disturbances presented in aeronautical imaging equipment can cause visual axis jitter, which directly leads to a reduction in closed-loop bandwidth and a decrease in tracking accuracy. The disturbance frequency affecting the stable control platform is mainly concentrated in the low- and middle-frequency bands, but the commonly used three closed-loop feedback control methods do not perform well in the disturbance rejection of those frequency bands. Moreover, the only disturbance observer in the acceleration loop cannot improve the low-band disturbance rejection capability due to the drift of the micro-electro-mechanical-system (MEMS) accelerometers in the low-frequency range. To solve these problems, this paper proposed dual disturbance observers (dual DOB) based on the disturbance information in the acceleration loop and the position loop. This design used two compensators to observe and compensate for the disturbances, which did not require additional sensors, and therefore did not increase system cost. Theoretical demonstrations and physical experiments showed that the designed method of the dual DOB not only improved the disturbance rejection capability of the low- and middle-frequency band of the optoelectronic stable control platform, but also improved the robustness of the system.

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Enhanced disturbance observer-based hybrid cascade active disturbance rejection control design for high-precise tracking system in application to aerospace satellite

Wang,

Deng,

Zhang

et al. 2024

Aerospace Science and Technology

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Disturbance Observer-Based Control of Tip-Tilt Mirror for Mitigating Telescope Vibrations

Cited by 35 publications

References 27 publications

The Frequency-Domain Fusion Virtual Multi-Loop Feedback Control System with Measured Disturbance Feedforward Method in Telescopes

The Frequency-Domain Fusion Virtual Multi-Loop Feedback Control System with Measured Disturbance Feedforward Method in Telescopes

Three Closed-Loop Feedback Control System with Dual Disturbance Observers of an Optoelectronic Stable Control Platform

Enhanced disturbance observer-based hybrid cascade active disturbance rejection control design for high-precise tracking system in application to aerospace satellite

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