Browse Publications Technical Papers 2019-01-1564
2019-06-05

Fault Feature Extraction of Elliptically Shaped Bearing Raceway 2019-01-1564

The elliptically shaped bearing (ESB) with a rigid, elliptical inner race and a flexible, thin-walled outer race is the most easily damaged core component of harmonic drive. The ESB rotates under cycle load of alternating stress due to its special elliptic structure. Hence, the fault features of ESB such as fatigue spalling and pitting are apt to be concealed by the excitation of impulses caused by alternating between major axis and minor axis. In order to diagnose the fault on raceway surfaces of ESB, a new method of CMWT-FH based on Continuous Morlet Wavelet Transform (CMWT) and FFT-based Hilbert (FH) spectrum analysis is proposed to extract the fault feature. First, the formulas of feature frequency is deduced based on the geometry and kinematics characteristics of ESB; then the CMWT method is employed to decompose the fault signal of ESB; finally, the FH spectrum analysis is performed to extract the feature frequency of faulty ESB from the decomposition signal with the maximum kurtosis in the first several layers. Compared with the traditional FH method, the feature frequency and its sideband and whether the fault location is on the outer or inner ring of faulty ESB can be identified by the proposed CMWT-FH method more accurately.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

A Contact Stress Model for Predicting Rolling Contact Fatigue

921720

View Details

TECHNICAL PAPER

Application of Basic Material Tests for Evaluating New Engineering Materials

870801

View Details

TECHNICAL PAPER

Fatigue Performance of Forged Steel and Ductile Cast Iron Crankshafts

2007-01-1001

View Details

X