Dynamic analysis of two meters telescope mount control system

Yong-ting, 邓永停 Deng; Hong-wen, 李洪文 Li; Tao, 陈 涛 Chen

doi:10.3788/ope.20182603.0654

Cited by 2 publications

(1 citation statement)

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“…The main findings of this work can be summarized as follows: 1) The frequency domain characteristic of the turntable pitch axis is tested by the classical sweep method [33]. According to the frequency domain characteristic curve, the system model is obtained by the traditional identification method, which is the precondition for the design of SMC.…”

Section: Introductionmentioning

confidence: 99%

Control Technology of Ground-Based Laser Communication Servo Turntable via a Novel Digital Sliding Mode Controller

et al. 2019

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In this study, a sliding mode control (SMC) algorithm was proposed based on a novel reaching law to solve the nonlinear disturbance problem of a ground-based laser communication turntable. This algorithm is a chatter-free method, in which the coefficient of sliding mode variable structure function is designed as an adaptive function, so the chattering of the sliding mode approaches zero. For any perturbed system, this algorithm can ensure a finite time for the system state to reach the sliding mode surface from any initial state. Additionally, the system will stabilize in the quasi-sliding mode domain (QSMD) with O(T3) width, where a narrower QSMD width corresponds to stronger robustness toward nonlinear disturbances. Both mathematical calculations and simulations verified the sliding mode and stability of this control algorithm. Experimental results of the velocity closed-loop of pitch axis show that the proposed algorithm effectively improved the anti-nonlinear disturbance ability of the control system compared with the effects of the traditional digital PID and the existing chatter-reduced SMC algorithms, for smooth system operation.

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Section: Introductionmentioning

confidence: 99%

Control Technology of Ground-Based Laser Communication Servo Turntable via a Novel Digital Sliding Mode Controller

et al. 2019

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A Novel Equivalent Combined Control Architecture for Electro-Optical Equipment: Performance and Robustness

Liu,

Zheng,

Chen

et al. 2024

Applied Sciences

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In this paper, we propose a novel equivalent composite control architecture for electro-optical equipment. The improved tracking performance and loss of robustness caused by this structure have a clear relationship with a2, the time coefficient of the compensation circuit. The compensation circuit can make the speed quality factor and the acceleration quality factor of the system infinite, and the jerk quality factor can be expanded to 1/a2 times the original acceleration quality factor, but it will cause a main zero point of the servo system to be far away from the virtual axis and the main poles to be close to the virtual axis. As the time coefficient of the compensation loop controller decreases, the tracking performance of the system increases, but the robustness decreases, the dynamic response deteriorates, the water bed effect becomes more obvious, and the system is more susceptible to noise and disturbances. Compared to the existing method, our method focuses on system performance and robustness. Experimental results show that our method can achieve target tracking with a peak accuracy of 64″ and 22″ (RMS), which is superior to the tracking performance without equivalent composite control.

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Dynamic analysis of two meters telescope mount control system

Cited by 2 publications

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Control Technology of Ground-Based Laser Communication Servo Turntable via a Novel Digital Sliding Mode Controller

Control Technology of Ground-Based Laser Communication Servo Turntable via a Novel Digital Sliding Mode Controller

A Novel Equivalent Combined Control Architecture for Electro-Optical Equipment: Performance and Robustness

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