基于叶尖定时技术的叶轮叶片动态监测研究现状

叶轮作为旋转机械的核心部件之一，在复杂恶劣的工况中容易使叶片产生振动，进而引发疲劳断裂等失效形式，因此对叶片振动进行状态监测具有重要意义。非接触式的叶尖定时技术具有同时监测整级叶片的优势，为叶片振动及损伤诊断提供了有效方式。本文从叶尖定时传感、叶片振动及损伤监测等三个方面对国内外研究现状进行综述，总结了当前研究中存在的不足，并就叶尖定时技术及叶片健康监测的发展方向进行了展望。

Research State of Dynamic Monitoring for Blades of Impellers Based on Blade Tip-Timing

As one of the key parts of rotating machinery, blades of impellers working in complex and bad condition suffer from vibration load easily, which can lead to blade failure such as fatigue fracture, and threaten the safety of the whole machine. In order to avoid the dangerous situation, it is meaningful to monitor the vibration of blades dynamically. Nowadays, as the most promising non-contact method, tip-timing has the ability of monitoring the entire series of blades, providing an effective means for vibration and damage diagnosis of blades. This paper gives a summary of research state in the fields of tip-timing sensing, vibration and damage monitoring of blades, and some insufficiencies are illustrated as well. At the end, the future development of tip-timing and blade heath monitoring is forecasted.