轮盘低循环疲劳试验裂纹在线监测系统应用研究

Real-time crack detection system for low-cycle fatigue test

针对现有轮盘低循环疲劳试验裂纹离线检测效率低、成本高昂、检出不及时等问题,提出一种用于实时识别、跟踪轮盘疲劳裂纹的工程实用在线监测系统。该系统将同步振动振幅和相位结合为向量,引入“基线”向量表征无裂纹平均响应,以向量差为裂纹特征参数,并进行了理论公式推导,建立了以相对幅值大小和变化速率为依据的自动停车规范。以真实轮盘低循环疲劳试验为应用对象,验证了系统的有效性。

Aiming at the low efficiency,laborious costly and untimely detection of the crack in existing disc low-cycle fatigue test,a practical engineering method for real-time identification and tracking of disc fatigue cracks was introduced.The system combined the synchronous vibration amplitude and phase into a vector,introduced crack-free response of the“baseline”vector pin,proposed a vector difference as the crack characteristic parameter,and derived the theoretical formula.Then an automatic shut-down specification based on the relative amplitude and change rate was established.Taking the real disk low-cycle fatigue test as the application object,the effectiveness of this system and method has been verified.