Phase-Based Noncontact Vibration Measurement of High-Speed Magnetically Suspended Rotor

Phase-Based Noncontact Vibration Measurement of High-Speed Magnetically Suspended Rotor
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高速磁悬浮转子的基于相位的非接触振动测量

DOI:
10.1109/tim.2019.2956333
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发表时间:
2020-07
影响因子:
5.6
通讯作者:
Wang Yangang
Wang Yangang
中科院分区:
工程技术2区
文献类型:
--
作者:
Peng Cong;Zeng Cong;Wang Yangang

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视频测量作为工业检测中最常用的非接触测量方法之一,得到了迅速的发展。数字摄像机具有成本低、自动化程度高、可同时进行全场测量等优点。本文主要研究了利用数码相机提取高速旋转机械的微振动信号。提出了一种改进的基于相位的运动提取和基于学习的视频放大方法,用于测量高频小振幅的微振动。改进了基于相位的运动提取方法,直接将相位变化转化为位移,而不需要计算相位梯度。此外,基于学习的运动放大被用来放大和定性测量的微振动在指定的频带。基于相位的运动提取是一种定量的度量,而基于学习的视频放大是一种定性的度量。磁悬浮电机系统微振动测量的实验结果验证了该方法的有效性。
Video-based measurement, as one of the most common noncontact measurement methods for industrial inspection, has been developed rapidly. Digital video cameras offer the benefit of low cost, high automation, and are capable to make the simultaneous full-field measurement. This article focuses on studying the microvibrational signal extraction for high-speed rotating machinery with digital cameras. An improved phase-based motion extraction and learning-based video magnification are proposed for measuring the microvibration with high frequency and small amplitude. The phase-based motion extraction is improved by directly transforming the phase variations into the displacement without the computation of phase gradient. Furthermore, the learning-based motion magnification is utilized to amplify and qualitatively measure the microvibration in specified frequency bands. The phase-based motion extraction is a quantitative measurement, while the learning-based video magnification is a qualitative measurement. Experimental results for microvibration measurement rising from a magnetically suspended motor system validate the effectiveness of the proposed method.
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