叶片裂纹故障的多普勒在线监测技术仿真研究

本文研究了文献1]介绍的叶片裂纹故障声学多普勒在线监测技术的监测原理;提出了一种新的基于裂纹叶片振动响应波形不对称性的监测方法;编制了这两种方法的计算及信号处理程序。仿真计算证明这些程序是可行的,同时表明,本文建立的新的监测方法在监测有效性、可靠性方面具有优势。 

SIMULATION OF DOPPLER ON-LINE MONITORING TECHNIQUE FOR BLADE CRACK FAULT

An on-line monitoring technique for blade crack fault is set up according to the mechanism of an acoustic doppler on-line monitoring technique,which is based on cracked blade's resonant phenomenon in turbine machinery.But the resonant phenominon can not be captured easily,because the fatigue crack expands very quickly due to the high frequency vibration of turbine blade.So that a new monitoring method based on the unsymmetry in vibration response of the cracked blade is developed,which utilizes the achivements in analyzing the vibration of the cracked blade.The program for calculating vibration response wave form of the rotating blade from acoustic doppler signals is worked out.Simulation research indicates that this new method can monitor the crack fault more effectively.