Fault Diagnosis of Planetary Roller Screws via Digital Twin + Transfer Learning
Master's Researcher · 24 months (2026–2028)
Problem
Planetary Roller Screws (PRS) are high-precision actuators used in robotics, aerospace and CNC machines, but real-world failure data is extremely scarce, preventing direct training of conventional deep-learning models.
Approach
Analytical model. Hertzian 3-body contact + 6-DOF Lagrangian dynamics; compute the characteristic frequencies RPF / RSF / NBF.
Digital Twin. Roller FEA in ANSYS → export MNF → rigid-flex integration in MSC Adams. Sweep fault parameters (pitting / crack / wear / preload loss), validated to <10% error vs. analytical frequencies.
Simulation dataset. 48 scenarios × 100 s @ 20 kHz, 1 s sliding window with 90% overlap; physical features (kurtosis RPF/NBF, VMD) + 1D-CNN deep features.
Transfer Learning. Compare three strategy families: instance-based (TrAdaBoost+KLIEP), feature-based (MMD/CORAL/DANN-lite), adversarial (CDAN/MCD) to reduce the simulation↔real domain gap.
