Adaptive vibration control method for double-crystal monochromator base on VMD and FxNLMS
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Published:2023-02-20
Issue:2
Volume:30
Page:308-318
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ISSN:1600-5775
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Container-title:Journal of Synchrotron Radiation
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language:
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Short-container-title:J Synchrotron Radiat
Author:
Bai Yang,Gong Xuepeng,Lu Qipeng,Song Yuan,Zhu Wanqian,Xue Song,Wang Dazhuang,Peng Zhongqi,Zhang Zhen
Abstract
Double-crystal monochromators (DCMs) are one of the most critical optical devices in beamlines at synchrotron sources, directly affecting the quality of the beam energy and position. As the performance of synchrotron light sources continues to improve, higher demands are placed on the stability of DCMs. This paper proposes a novel adaptive vibration control method combining variational modal decomposition (VMD) and filter-x normalized least mean squares (FxNLMS), ensuring DCM stability under random engineering disturbance. Firstly, the sample entropy of the vibration signal is selected as the fitness function, and the number of modal components k and the penalty factor α are optimized by a genetic algorithm. Subsequently, the vibration signal is decomposed into band frequencies that do not overlap with each other. Eventually, each band signal is individually governed by the FxNLMS controller. Numerical results have demonstrated that the proposed adaptive vibration control method has high convergence accuracy and excellent vibration suppression performance. Furthermore, the effectiveness of the vibration control method has been verified with actual measured vibration signals of the DCM.
Funder
National Natural Science Foundation of China
Publisher
International Union of Crystallography (IUCr)
Subject
Instrumentation,Nuclear and High Energy Physics,Radiation
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