The invention discloses a
water turbine vibration monitoring method based on an
optical fiber sensing technology. The method comprises the following steps: 1, installing and fixing an optical cable; 2, starting the optical cable and the
water turbine, generating a reflected
light signal by an
optical fiber sensor on the optical cable, and then obtaining a
dominant frequency amplitude and vibration data; 3, performing high-pass filtering and
noise reduction
processing on the vibration data; fourthly, the power of the
water turbine is inverted according to the main frequency amplitude, and then an alarm threshold value is adjusted in a self-adaptive mode according to the power; 5, when the vibration data of the
optical fiber sensor exceeds an alarm threshold value, giving an alarm, recording the alarm duration, then analyzing the vibration data, and carrying out first-level alarm or second-level alarm; the optical
fiber sensor is used for monitoring vibration, and the anti-
electromagnetic interference performance of the optical
fiber sensor is good, so that the vibration monitoring effect is good; and the alarm threshold value is adjusted in a self-adaptive manner, so that
false alarm or missing alarm cannot occur, and the precision is relatively high. Therefore, according to the design, the vibration monitoring effect is good, and the monitoring precision is high.