CAJ | 학술논문

轴承的健康状况对旋转机械的工作状况有极大的影响。航空器中的故障轴承会间接造成事故，给飞行安全带来灾难性的后果，需要进行早期故障的有效检测判别或状态监测。与振动等传统的检测手段相比，声发射可有效检测到故障的早期状态，准确判断故障类别和严重程度。介绍了滚动轴承故障声发射检测原理以及光纤光栅声发射检测新技术。以预制外圈缺陷的轴承为例，进行了压电式声发射传感系统和光纤光栅声发射传感系统检测的对比实验，实验和分析结果表明光纤光栅声发射方法检测到的信号谱底噪声小，谱线清晰、干净，更容易分辨故障频率和分析故障的严重程度，优于振动和压电式声发射传感方法。最后介绍该技术在直升机维修保障中的应用情况。
축승적건강상황대선전궤계적공작상황유겁대적영향。항공기중적고장축승회간접조성사고，급비행안전대래재난성적후과，수요진행조기고장적유효검측판별혹상태감측。여진동등전통적검측수단상비，성발사가유효검측도고장적조기상태，준학판단고장유별화엄중정도。개소료곤동축승고장성발사검측원리이급광섬광책성발사검측신기술。이예제외권결함적축승위례，진행료압전식성발사전감계통화광섬광책성발사전감계통검측적대비실험，실험화분석결과표명광섬광책성발사방법검측도적신호보저조성소，보선청석、간정，경용역분변고장빈솔화분석고장적엄중정도，우우진동화압전식성발사전감방법。최후개소해기술재직승궤유수보장중적응용정황。
The health state of a bearing has a tremendous influence on a rotating machinery.A failing bearing can not only jeopardize the safety of flight but also induce collateral damages.It is necessary to monitor and judge the tiny earlier fault in an effective way.Compared with the conventional vibration detection approach,acoustic emission (AE) can be used to detect the earlier state of the fault,and diagnose the fault type and damage level.Here,the detecting principle of rolling bearing fault with AE and the novel AE detection technique using a fiber Bragg grating (FBG)were introduced.A comparative experimental study with FBG sensor and the commercial PZT-based transducers was conducted to detect a precut defect on the outer race of a rolling bearing.The experimental and analysis results showed that the detected signals with FBG have better spectra than those using PZT with clearer lines and lower noise,the fault frequency and damage level can be more easily identified.Finally,the applications of this technique in helicopter maintenance were introduced.