Niu Hang, Zhang Xiaodong, Hou Chenggang
School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xi'an 710049, China.
Sensors (Basel). 2017 Dec 16;17(12):2872. doi: 10.3390/s17122872.
The strain of the ring gear can reflect the dynamic characteristics of planetary gearboxes directly, which makes it an ideal signal to monitor the health condition of the gearbox. To overcome the disadvantages of traditional methods, a new approach for the dynamic measurement of ring gear strains using fiber Bragg gratings (FBGs) is proposed in this paper. Firstly, the installation of FBGs is determined according to the analysis for the strain distribution of the ring gear. Secondly, the parameters of the FBG are determined in consideration of the accuracy and sensitivity of the measurement as well as the size of the ring gear. The strain measured by the FBG is then simulated under non-uniform strain field conditions. Thirdly, a dynamic measurement system is built and tested. Finally, the strains of the ring gear are measured in a planetary gearbox under normal and faulty conditions. The experimental results showed good agreement with the theoretical results in values, trends, and the fault features can be seen from the time domain of the measured strain signal, which proves that the proposed method is feasible for the measurement of the ring gear strains of planetary gearboxes.
齿圈的应变能够直接反映行星齿轮箱的动态特性，这使其成为监测齿轮箱健康状况的理想信号。为克服传统方法的缺点，本文提出一种利用光纤布拉格光栅（FBG）动态测量齿圈应变的新方法。首先，根据对齿圈应变分布的分析确定FBG的安装位置。其次，考虑测量的精度、灵敏度以及齿圈的尺寸来确定FBG的参数。然后在非均匀应变场条件下对FBG测得的应变进行模拟。第三，构建并测试动态测量系统。最后，在正常和故障条件下测量行星齿轮箱中齿圈的应变。实验结果在数值、趋势方面与理论结果吻合良好，并且从测量应变信号的时域中可以看出故障特征，这证明所提出的方法对于测量行星齿轮箱齿圈的应变是可行的。
