基于光纤光栅的传动齿轮模态分析

利用光纤光栅传感器实现了基于快速应变响应的传动齿轮模态分析。基于波分复用技术组建光纤光栅传感网络,根据光纤光栅的应变响应数据完成齿轮的应变模态分析,并与基于声压传感器的齿轮试验模态分析结果进行对比,固有频率相对误差小于0.1%。为了实现光纤光栅传感器的快速应变采集,搭建了一套光纤光栅快速解调仪。该解调仪是基于体相位解调的单通道快速解调仪,采样速率最高为35kHz,使用LabVIEW编写了光纤光栅信号采集和解调软件。基于光纤光栅的齿轮应变模态分析方法附加质量小,比传统加速度传感器测量结果更准确,能够适应小型齿轮箱内部复杂和恶劣的测量环境,具有一定的应用价值。

Modal Analysis of Transmission Gear Based on Fiber Bragg Grating

The modal analysis of transmission gear based on fast strain response was realized by using fiber Bragg grating (FBG) sensor. The FBG sensor network was constructed by using wavelength division multiplexing technology. The strain modal analysis of gear was completed according to the strain response data of FBG. Compared with the experimental results of the gear based on acoustic pressure sensor, the natural frequency has a relative error of less than 0.1%. In order to realize gear modal analysis based on FBG sensor, a set of FBG fast demodulator was built. The demodulator is a single-channel fast demodulator based on body phase demodulation with a sampling rate of up to 35kHz. The software of FBG signal acquisition and demodulation was written by LabVIEW. The proposed modal analysis method has small additional quality, and obtains more accurate measurement results compared with traditional acceleration sensors. The FBG-based modal analysis method can adapt to the complex and harsh measurement environment inside the small gear box, and has certain application value.