An Approach to Detect Damage Quantitatively for Planetary Gear Sets Based on Physical Models

Quantitative damage detection is an obstacle in monitoring and diagnosis for transmission systems, an approach based on physical models is presented to overcome this problem. Physical models were established for 2K-H planetary gear sets with healthy sun-gear and with tooth-chipped sun-gear. Then, features were extracted and selected based on the simulation results of the physical models of planetary gear sets. A feature named SAR, which had better performance in tracking damage, was obtained. After then, sun gear tooth-chipped seeded tests of planetary gear sets were carried out, and the damages in the test were detected quantitatively. The validation has a promising result.