Planetary Gearbox Fault Diagnosis Using Strain Sensor Signal Analysis

Jae Yoon, David He, Thomas J. Nostrand, Junda Zhu, and Eric Bechhoefer
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Full Paper
phmc_14_016.pdf803.42 KBSeptember 22, 2014 - 7:09am

Planetary gearboxes are widely used in the drivetrain of helicopters and wind turbines. Any planetary gearbox failure could lead to breakdown of the whole drivetrain and major loss of helicopters and wind turbines. Therefore, planetary gearbox fault diagnosis is an important topic in PHM. Planetary gearbox fault diagnosis has been done mostly through vibration analysis over the past years. Vibration signals theoretically have the amplitude modulation effect caused by time variant vibration transfer paths due to the rotation of planet carrier and sun gear, and therefore their spectral structure are complex. It is difficult to diagnose planetary gearbox faults via vibration analysis. Strain sensor signals on the other hand have less amplitude modulation effect. Thus, it is potentially easy and effective to diagnose planetary gearbox faults via stain sensor signal analysis. In this paper, a research investigation on planetary gearbox fault diagnosis via strain sensor signal analysis is reported. The investigation involves using time synchronized averaging technique to process signals acquired from a single piezoelectric strain sensor mounted on the housing of a planetary gearbox and extracting condition indicators to obtain diagnostic information. The reported investigation includes analysis results on a set of seeded fault tests performed on a planetary gearbox test rig in a laboratory. The results have showed a satisfactory planetary gearbox fault diagnostic performance of using strain sensor signal analysis.

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Submission Keywords: 
Planetary gearbox
strain sensors
fault diagnosis
Submission Topic Areas: 
Model-based methods for fault detection, diagnostics, and prognosis
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