Gear tooth root fatigue test monitoring with continuous acoustic emission

A test rig is used to load an individual gear tooth in static bending fatigue. The two gears are meshed together, with the lower (fully restrained, rotation prevented) gear attached to a fixed shaft whilst the upper (free) gear is mounted on a shaft held in bearings. A torque is applied to this shaft using a compression testing machine via a loading arm. Acoustic Emission signals were collected by a Pancom P15 sensor (50 – 500 kHz) coupled to the free gear adjacent to the tooth under test using cyanoacrylate adhesive. The data was recorded by a MISTRAS group PCI 2 data acquisition system. Complete wavestreams were captured over one loading cycle. These wavestreams capture the sensor output without any interpretation by the data acquisition system, and are independent of threshold. Each wavestream was collected every 10 cycles, sampled at 2MHz, 16-bit resolution and a duration of 1s, which covers one complete tooth loading cycle.

本试验台用于对单个齿轮轮齿开展静态弯曲疲劳加载试验。两个齿轮相互啮合，其中下部齿轮（完全约束，限制转动）固定于刚性轴上，上部自由齿轮安装于带轴承的支撑轴上。通过加载臂，由压缩试验机向该支撑轴施加扭矩。声发射（Acoustic Emission, AE）信号由Pancom P15型传感器（工作频段50–500 kHz）采集，该传感器通过氰基丙烯酸酯胶粘剂固定于待测轮齿相邻的自由齿轮上。数据由MISTRAS集团PCI 2型数据采集系统完成记录。完整波形流在单个加载周期内完成采集，此类波形流保留了传感器的原始输出信号，未经过数据采集系统的任何解析处理，且与阈值设置无关。每10个加载周期采集一组完整波形流，采样率为2MHz，分辨率为16位，单组波形流时长为1秒，可覆盖单个轮齿完整的加载周期。