中文摘要：滚动轴承广泛应用于许多行业，其在线诊断非常重要。然而，目前还没有有效的方法在线检测小故障。在这篇文章中，提出了一种光纤布拉格光栅（FBG）声发射（AE）传感方法，并在加速轴承寿命测试仪（ABLT）内进行了测试。FBGAE传感器体积小，抗电磁干扰，本质防爆，因此适合ABLT的内部环境，ABLT体积小，电磁干扰高，充满润滑油。因此，我们可以将FBG AE传感器安装在ABLT内。基于可调窄带激光解调原理的实验系统被建立起来，用于收集不同故障类型的故障滚动轴承的AE信号。然后，通过包络解调算法，我们获得了轴承的故障特征频率，这些频率与理论故障频率一致。结果表明，FBG AE传感器对滚动轴承的小故障敏感，可以在ABLT内使用。
英文摘要：Rolling bearings are widely used in many industries and their online diagnosis is very important. However, there is still no effective way to detect small faults online. In this article, a fiber Bragg grating (FBG) acoustic emission (AE) sensing method is proposed and tested inside an accelerated bearing life tester (ABLT). The FBGAE sensors are small, resistant to electromagnetic interference, intrinsically explosion-proof, and are thus fit for the inner environment of an ABLT, which is small, has high electromagnetic interference, and is full of lubrication oil. Therefore, we could install the FBG AE sensors inside an ABLT. The experimental system based on the principle of tunable narrowband laser demodulation is built up to collect the AE signals of faulty rolling bearings with different fault types. Then, with the envelope demodulation algorithm, we obtained the fault characteristic frequencies of the bearings that were consistent with the theoretical fault frequencies. The results show that the FBG AE sensors are sensitive to the small faults of rolling bearings and can be used inside an ABLT.
