Evaluation of Spur Gear Pair on Tooth Root Bending Stress in Radial Misalignment Contact Condition

Lias, M. R.; Awang, Mokhtar; Rao, T. V. V. L. N.; Ahmad, Mohamad Syahrizal; Patil, Santosh

doi:10.1051/matecconf/20141304010

Cited by 1 publication

(1 citation statement)

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“…It can be seen from Figure 5 that the stress in the middle part of gear width is always larger than that on the gear end. Similar simulation study was also reported in Lias et al 22 and Li. 23 It should be noticed that when the strain is measured along tooth width direction, the equivalent strain along the tooth height direction or circumferential direction must be computed based on Poisson's coefficient and may not be a trivial task.…”

Section: Sensor Deployment Specificssupporting

confidence: 90%

Experimental study of dynamic strain for gear tooth using fiber Bragg gratings and piezoelectric strain sensors

Hong

Jiang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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It has always been a critical task to understand gear dynamics for gear design and condition monitoring. Many gear models have been proposed to simulate gear meshing dynamics. However, most of the theoretical models are based on simplified gear structure and may contain approximation errors. Direct measuring of gear strain is important for gear design validation, load analysis, reliability assessment, gear condition monitoring, etc. Most of the existing studies of tooth strain measurements are performed under static load condition. In this paper, we investigate new measuring techniques using fiber Bragg grating sensor and piezoelectric strain for gear dynamic strain measurement. We conduct gear dynamic strain measurement under both normal and pitted conditions to evaluate the strain transition process and pitting effect. The experiments are performed on an industrial gearbox with relatively small module gears. Multiple combinations of speed and load conditions are tested and the results are discussed and analyzed. We analyze multiple factors that affect the tooth root stress, including speed, load, extended tooth meshing, etc. It is found that under low operation speed range, the tooth root strain is mainly determined by the torque, while in the medium to high speed range, the tooth root strain is jointly affected by speed and torque. Extended tooth contact is shown in the measurement results with strong evidence. It conforms to earlier founding that the transmission error and dynamic load factor are overestimated for spur gear under heavy load. We also evaluate the change in dynamic strain caused by pitted tooth surface. It is shown that pitting faults lead to decreased bending strain on the tooth, especially in single-tooth contact zone, which represents a loss in torque and possibly reduced mesh stiffness. Numerical simulations are also provided to make comparisons and help to interpret the experimental results.

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Section: Sensor Deployment Specificssupporting

confidence: 90%