无转速同步叶尖定时预处理方法及误差分析

The Preprocessing Method of the Blade Tip-timing Measurement without a Once-per-revolution Sensor and Error Analysis

提出了一种无转速同步叶尖定时信号预处理方法,通过同一叶片到达不同叶尖定时传感器的振动位移差进行振动参数辨识和转速测量。误差分析表明,该方法可以降低转速测量误差以及转速误差对振动位移测量的影响。分析了振动位移差的测量误差,并与采用转速同步的方法进行了比较。实验结果表明,该方法能够有效地实现叶尖定时测量并具有良好的测量精度。

A method for preprocessing tip-timing signals that does not require a once-per-revolution （OPR） sensor is proposed. The method measures the difference in the blade＇s vibration displacement when it arrives at different tip-timing sensors to identify the blade＇s vibration parameters and the rotational speed of the rotor. Error analysis indicates that the method can reduce the rotational speed measurement error and its impact on the vibration displacement measurement. The measurement error of the difference in vibration displacement is analyzed and compared with the method that requires an OPR sensor. Experiment results show that the method is feasible for BTT signal preprocessing without an OPR sensor and is very accurate.