Abstract
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.
Highlights
Because of the large transmission ratio and the strong load-bearing capacity, planetary gearboxes are widely used in aero-engines, wind turbines and automobiles [1]
100 r/min, and the load of the planetary gearbox is Figure shows the original strain signal the bore of the ring gear and rotates, the low-frequency component experiment is operated under the condition that the inputthe speed of the planetary gearbox is the measured The by FBG1
An approach for dynamic measurements of ring gear strains of planetary gearboxes using fiber Bragg gratings (FBGs) is proposed
Summary
Because of the large transmission ratio and the strong load-bearing capacity, planetary gearboxes are widely used in aero-engines, wind turbines and automobiles [1]. The electrometric method makes use of strain gauges, which are mounted at the measurement area. These two methods both have a long history, and in recent years, they have been used to determine the distribution of tooth root strain [13], to calculate the meshing stiffness under tooth cracks [14,15,16], study the effect of errors and tooth modifications to the tooth root strain [17,18,19], and analyze the contact stress of helical gears under different helical angles [20]. The two traditional methods are very effective in experiments, but they both have some problems to measure the strain of the ring gear in realistic planetary gearboxes with narrow inner space. For the new measurement object, the installation, the sensing characteristics and the measurement system of FBGs have some unique features, which will be analyzed in this paper
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