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Sensors 2017, 17(12), 2872;

An Approach for the Dynamic Measurement of Ring Gear Strains of Planetary Gearboxes Using Fiber Bragg Gratings

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
Author to whom correspondence should be addressed.
Received: 30 September 2017 / Revised: 6 December 2017 / Accepted: 7 December 2017 / Published: 16 December 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
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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. View Full-Text
Keywords: planetary gearbox; ring gear; strain; FBG; dynamic measurement planetary gearbox; ring gear; strain; FBG; dynamic measurement

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Niu, H.; Zhang, X.; Hou, C. An Approach for the Dynamic Measurement of Ring Gear Strains of Planetary Gearboxes Using Fiber Bragg Gratings. Sensors 2017, 17, 2872.

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