Multi-band beyond-Nyquist disturbance rejection on a galvanometer scanner system

Xiao, Hui; Chen, Xu

doi:10.1109/aim.2017.8014263

Cited by 1 publication

(1 citation statement)

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“…To reduce the tracking error for galvanometer trajectories, Zaeh et al combined an adaptive inverse control with dynamic behaviors of structures, thus proposing a photo adaption inverse control method, whose tracking error was 90% lower than that of the reference controller [10]. Xiao et al developed a scheme based on a multi-rate control to resist external disturbance caused by laser-material interaction, thereby inhibiting narrow-band non-Nyquist disturbance [11]. Considering the requirements for high accuracy and high dynamics of GSs, Qin et al proposed a high-accuracy position control method based on an active disturbance rejection control (ADRC): this overcame the problem of the high-frequency noise incurred by the traditional speed-calculating method based on a differentiator and ensured a high-accuracy position control of the system [12].…”

Section: Introductionmentioning

confidence: 99%

Control of a Digital Galvanometer Scanner Using a Discrete-Time Sliding-Mode Variable-Structure Controller Based on a Decoupled Disturbance Compensator

Chen

Wang

2021

Applied Sciences

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Laser processing plays an important role in industrial manufacturing, in which a galvanometer scanner (GS) functions as the core component of the laser processing equipment. With the development of the digital system, the GS based on the digital system finds a broader range of potential application. In order to address the slow step-responses of a GS with disturbance and parameter perturbation, the mathematical model of the motor of the GS is derived and a discrete-time sliding-mode variable-structure controller (DSVC) based on a decoupled disturbance compensator (DDC) (DSVC+DDC) is designed. The step-response performance of a GS is the key factor affecting the quality evaluation of laser processing. Experiments are conducted on the step responses of the motor of the GS on a digital experimental platform. The experiment results show that when guaranteeing a steady-state error within 20 urad and an overshoot of less than 5%, the rise time for step-responses in 1% and 10% of the whole stroke is 1 and 2 ms, decreasing by 23% and 58% compared with the reference performance index, which indicates the effectiveness of the proposed method. The proposed approach can not only compensate for the external disturbance online and improve the step-response speed of the GS, but also relax the traditionally assumed limit of the upper bound of external disturbance to the limit of the change rate of external disturbance, which reduces the difficulty of a practical application. This method has great significance for further applications in high precision machining.

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Section: Introductionmentioning

confidence: 99%