- A dynamic model of a planetary gear is constructed based on time-varying gear mesh stiffness.
- A fault is injected in the planet gear considering phase differences of the planetary gear.
- Signal processing is performed based on dynamic characteristics of transmission error (TE).
- This research is published in IEEE Transactions on Reliability.
- A Positive energy residual (PER) method is proposed to detect faults of a planetary gear under variable speed conditions using wavelet transform and a Gaussian process.
- The PER method is validated using modulated vibration signals that simulated planetary gearbox.
- The method is also validated using vibration signals measured from planetary gear test-bed.
- This research is published in Mechanical Systems and Signal Processing.
- A variance of energy residual (VER) method is developed to detect faults of a planetary gear under variable-speed conditions in a time-efficient manner.
- The VER method is validated using simulated vibration signals of the planetary gearbox.
- The method is also validated using vibration signals measured from planetary gear test-bed.
- This research is published in Journal of Sound and Vibration.
- A failure prediction method is proposed for a motor-driven gearbox under external noises and disturbance.
- A cepstrum technique is used for extracting fault-relevant features, which is robust to external noises and disturbances.
- A weighted regression method is used to compensate for the lack of failure data.
- This research is published in Smart Structures and Systems.