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Method to improve the blade tip-timing accuracy of fiber bundle sensor under varying tip clearance

机译：改变尖端间隙时提高光纤束传感器叶片尖端定时精度的方法

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摘要

Blade vibration measurement based on the blade tip-timing method has become an industry-standard procedure. Fiber bundle sensors are widely used for tip-timing measurement. However, the variation of clearance between the sensor and the blade will bring a tip-timing error to fiber bundle sensors due to the change in signal amplitude. This article presents methods based on software and hardware to reduce the error caused by the tip clearance change. The software method utilizes both the rising and falling edges of the tip-timing signal to determine the blade arrival time, and a calibration process suitable for asymmetric tip-timing signals is presented. The hardware method uses an automatic gain control circuit to stabilize the signal amplitude. Experiments are conducted and the results prove that both methods can effectively reduce the impact of tip clearance variation on the blade tip-timing and improve the accuracy of measurements.
机译：基于叶片尖端定时方法的叶片振动测量已成为行业标准程序。光纤束传感器广泛用于尖端定时测量。但是，由于信号幅度的变化，传感器和刀片之间的间隙变化会给光纤束传感器带来调尖误差。本文介绍了一种基于软件和硬件的方法，可以减少由刀尖间隙变化引起的误差。该软件方法利用尖端定时信号的上升沿和下降沿两者来确定叶片到达时间，并提出了适用于非对称尖端定时信号的校准过程。硬件方法使用自动增益控制电路来稳定信号幅度。进行了实验，结果证明两种方法都可以有效地减小叶尖间隙变化对叶片叶尖正时的影响，并提高了测量精度。

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  • 来源
    《Optical engineering》 |2016年第1期|014106.1-014106.4|共4页
  • 作者

    Fajie Duan; Jilong Zhang; Jiajia Jiang; Haotian Guo; Dechao Ye;

  • 作者单位

    Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, No. 92 Weijin Road, Nankai District, Tianjin 300072, China;

    Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, No. 92 Weijin Road, Nankai District, Tianjin 300072, China;

    Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, No. 92 Weijin Road, Nankai District, Tianjin 300072, China;

    Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, No. 92 Weijin Road, Nankai District, Tianjin 300072, China;

    Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, No. 92 Weijin Road, Nankai District, Tianjin 300072, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    tip-timing; fiber bundle sensor; tip clearance;

    机译：定时提示纤维束传感器尖端间隙;

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