基于单传感器的旋转叶片振动测量与参数辨识方法

Rotating-blade vibration measurement and parameter identification method based on a single probe

叶尖定时技术作为一种非接触式叶片振动测量方法,是叶片状态监测的有效手段.针对叶尖定时采样数据存在的高度欠采样特点,目前已提出多种叶片振动测量与参数辨识方法.然而,现有方法大多需要在机匣上安装多支传感器,并对传感器的位置分布具有较为严格的要求,在工程实践中可能难以实现.针对这一不足,本文提出一种基于单传感器的旋转叶片振动测量与参数辨识方法.根据叶尖振动与传感器输出脉冲信号的关系,分析了利用单传感器的叶片振动测量和叶片振动参数辨识原理,使用仿真模型对该方法进行了验证,并分析了不同噪声水平对叶片振动参数辨识结果的影响;进一步利用旋转叶片试验台开展试验研究,通过与叶片动应变测试结果对比,验证了方法的有效性.

Blade tip timing technology is an efficient noncontact measurement method strategy for monitoring blade vibration.Various methods have been proposed to obtain the vibration parameters of the blade without sufficient measurement data sampling.However,most existing methods necessitate multiple probes mounted on the casing and a strict probe layout,which can be difficult for some applications.To address this limitation,this study proposes a novel method for identifying rotating blade vibration parameters.The proposed method uses the relationship between the blade tip vibration and the pulse signal output of the probe to evaluate the blade vibration parameters identification theory.The effect of noise on the identification results is discussed after running the simulations.The experiment is conducted,and the results are compared with the test results of the strain data to validate the effectiveness of the proposed method.