Abstract Blade Tip Timing (BTT) is a non-intrusive measurement technique that can be used to estimate the vibration characteristics of rotor blades during turbomachine operation. BTT uses proximity probes mounted into the turbomachine casing to measure the Time-of-Arrival (ToA) of rotor blades at these proximity probes. The ToAs are determined using a triggering criterion on the proximity probe signal. Rotor blade tip displacements are then calculated from these ToAs. It is therefore imperative that the triggering criterion be as accurate as possible. This article proposes a new method to determine the tip displacement of rotor blades from a proximity probe signal. The method first converts the signal into the angular domain and then obtains the tip deflection through manipulation of the instantaneous phase in the signal. Three experimental tests are conducted where existing triggering criteria are compared to the proposed method. It is found that the proposed method is highly accurate in determining the tip deflections for a constant rotor speed.

中文翻译：

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使用叶片尖端定时数据的瞬时相位确定等速尖端偏转

摘要 叶尖正时（BTT）是一种非侵入式测量技术，可用于估计涡轮机运行期间转子叶片的振动特性。BTT 使用安装在涡轮机外壳中的接近探头来测量转子叶片在这些接近探头上的到达时间 (ToA)。ToA 是使用对接近探测信号的触发标准来确定的。然后根据这些 ToA 计算转子叶片尖端位移。因此，触发标准必须尽可能准确。本文提出了一种根据接近探头信号确定转子叶片尖端位移的新方法。该方法首先将信号转换到角域，然后通过操纵信号中的瞬时相位获得尖端偏转。进行了三个实验测试，将现有的触发标准与所提出的方法进行比较。发现所提出的方法在确定恒定转子速度的尖端偏转方面是高度准确的。