Vibration Analysis for Damage Detection and Classification for Condition Monitoring on Worm Gears
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Abstract
Worm gears exhibit a higher proportion of sliding motion during tooth meshing than spur gears. Typically, this type of gear consists of a soft worm wheel, often made of brass, and a hard steel worm. These characteristics promote the occurrence of abrasive wear and further fatigue damage during operation. The objective of this study is the vibration data analysis for a sensor-based detection and classification of two types of damage in worm gears during operation. For this purpose, a data set is available containing the measurement data from an accelerometer under various operating conditions with regard to rotational speed and torque. The data set comprises measurements of the undamaged condition, artificial tooth thickness reduction on the worm wheel to reflect wear, and artificial breakouts reflecting pitting damage on the worm. For damage detection the accelerometer data is evaluated in the frequency domain. The amplitudes at different frequencies are analyzed for each type of damage. Both types of damage exhibit distinct characteristics in the analyzed frequency spectra. Based on these differences, vibration-based indicators are derived from the frequency spectra, enabling the detection and classification of breakout damage on the worm and wear damage on the worm wheel. Breakout damage on the worm is characterized by a discrepancy in the acceleration amplitudes at the harmonics of the gear mesh frequency when compared to measurements obtained under undamaged conditions. For the wear damage on the worm wheel, a systematic difference compared to the undamaged reference measurement can be detected in the frequency range between 7.5 kHz and 8.5 kHz. In addition to the effect of the damage, a distinct influence of the rotational speed and torque is observed on the extracted indicators for damage detection. Since different data evaluation methods are best suited for detecting each type of damage, damage classification is possible. In the context of PHM, this enables health management measures to be implemented according to the severity of the detected type of damage.
How to Cite
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worm gear, damage, condition monitoring, frequency analysis
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