Detection Of Presence Of Cracks In Green PM Parts By Means Of Vibration Spectroscopy

Authors:

Alexey Tatarinov (Riga Technical University, Latvia),
Viktors Mironovs (Riga Technical University, Latvia),
Viktors Kurtenoks (Riga Technical University, Latvia)

Abstract:

Although the diagnostics of cracks in sintered PM parts can be performed by resonant acoustic inspection, cracks detection in green parts still remains challenging. The problem persists due to the inapplicability of a mechanical impact to brittle green parts and a low mechanical Q-factor resulting in the absence of expressed natural resonances. Cross-correlation analysis applied to vibration spectra in healthy and damaged green PM gears obtained by laser Doppler vibrometry demonstrated minimal discrepancy between healthy parts and strong differences between healthy and cracked parts. To approach a vital industrial implementation, possibilities for an alternative simpler realization were explored. The compared testing modalities included pendulum test with a lightweight platform, contactless excitation by a pulsed electromagnetic action and frequency sweep with an electrodynamic actuator. All testing modalities along with laser vibrometry demonstrated differences in the vibration spectra between healthy and damaged green parts quantitatively assessed by cross-correlation and cross-coherence analysis.

DOI:

https://doi.org/10.59499/WP225367369