基于叶尖间隙自适应测量的转子振动监测

Rotor Vibration Monitoring Based on Adaptive Blade Tip Clearance Measurement

中文关键词:  叶尖间隙  自适应测量  变转速  少测点监测  转子振动  轴心轨迹  航空发动机

英文关键词:blade tip clearance (BTC)  adaptive measurement  variable speed  monitoring with fewer measuring points  rotor vibra⁃ tion  axis trajectory  aeroengine

中文摘要:

      在变转速工况下，为了实现叶尖间隙的高精度测量，对电涡流传感器进行了多转速动态标定，基于动态灵敏度曲线提出 了变转速工况下叶尖间隙的自适应测量方法，并通过数值仿真和真实扭转叶片试验台测试对所提出的方法进行了验证。结果表 明：所提出的多转速动态标定方法的测量偏差小于9 μm，有较高的动态叶尖间隙测量精度。针对航空发动机测点少且测点多位 于机匣上的情况，初步提出了基于叶尖间隙测量的4传感器均布轴心轨迹监测方法，在少测点的条件下实现了叶尖间隙、转子振 动的同步监测。搭建原理性简易转子模型并进行测试验证，结果表明：根据所监测叶尖间隙信息能准确提取出转子轴心轨迹，验 证了该方法在简单转子模型上应用的可行性。

英文摘要:

      In order to realize the high precision measurement of BTC (Blade Tip Clearance) under variable speed conditions, the eddy current sensor was dynamically calibrated at multiple speeds, and the adaptive measurement method of BTC under different speed condi? tions was proposed based on the dynamic sensitivity curve. The proposed method was validated by numerical simulation and bench tests with twisted blades installed, and the results show that the measurement deviation of the proposed multi-rotational speed dynamic calibra? tion method is less than 9 μm, with high accuracy in measuring dynamic BTC. In response to the situation that there are limited measuring points and most of them are located on the aeroengine casing, a preliminary method for monitoring axis trajectory based on uniformly distributed four-sensor BTC measurement was proposed, which realizes the simultaneous monitoring of BTC and rotor vibration under the condition of limited measurement points. A simple principle rotor model was built, and verification tests were conducted, the results show that the rotor axis trajectory can be accurately extracted based on the monitored BTC information, verifying the feasibility of applying the method tosimple rotor models.