基于触发脉冲的涡轮机械叶尖间隙监测方法

发布时间：2018-05-20 13:59

本文选题：涡轮叶片 + 叶尖间隙监测　；参考：《振动.测试与诊断》2017年03期

【摘要】：针对电涡流传感器在进行叶尖监测时因带宽不足导致的欠采样问题,提出了一种基于触发脉冲的叶片健康监测方法。通过对传感器在不同叶尖相对位置的灵敏度进行标定,获得传感器灵敏度与传感器探头到叶尖的距离及与叶尖重合度的函数表达式。在监测过程中,将叶尖间隙与叶尖计时数据相融合,通过叶尖计时的方法得到在各个数据点的采集时刻,计算传感器探头与叶片的重合度,结合标定得到的函数表达式,可分析得出各个数据点对应的叶尖间隙值,并通过搭建的叶尖间隙监测实验台进行了实验验证。结果表明,较于峰值定位法,所提出的触发脉冲法有效地解决了因电涡流传感器带宽限制引起的欠采样问题,改善了高线速度下叶尖间隙的测量准确性,为基于电涡流传感器的叶尖间隙主动控制及叶片振动监测提供基础。
[Abstract]:A method of blade health monitoring based on trigger pulse is proposed to solve the under-sampling problem caused by the lack of bandwidth in Eddy current sensor monitoring. By calibrating the sensitivity of the sensor at different tip position, the functional expression of the sensor sensitivity, the distance from the sensor probe to the tip and the degree of coincidence with the tip of the sensor are obtained. In the monitoring process, the tip clearance and the tip timing data are fused, and the sampling time at each data point is obtained by the method of tip timing, and the coincidence degree between the sensor probe and the blade is calculated, combined with the calibrated function expression. The corresponding tip clearance values of each data point can be obtained, and the experimental verification is carried out by using the test bench built for monitoring the tip clearance. The results show that compared with the peak localization method, the proposed trigger pulse method can effectively solve the problem of under-sampling caused by the bandwidth limitation of eddy current sensor, and improve the accuracy of the measurement of tip clearance at high linear speed. It provides the basis for active control of tip clearance and blade vibration monitoring based on eddy current sensor.
【作者单位】：北京化工大学机电工程学院;
【基金】：国家自然科学基金资助项目(51275028,51135001) 北京高等学校青年英才计划资助项目(YETP0495)
【分类号】：TK14;TP212

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