Sensitivity of vibration-based fault metrics to spur gear crack damage and diametral pitch variations

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Sensitivity of vibration-based fault metrics to spur gear crack damage and diametral pitch variations

Liu, Lin / Pines, Darryll J.

Because of an alarming increase in the number of rotorcraft accidents related to transmission faults, transmission diagnostics continue to receive a considerable amount of attention in the rotorcraft commu nity. The most common of all failures that cause rotorcraft accidents are failures in the drive train or one of the gearboxes. This paper investigates the dynamic sensitivity of several fault metrics to a crack in a gear tooth located at the root of a pinion gear. This work studied the sensitivity of common vibration fault metrics to damage and their dependence on fundamental gear design parameters, e.g., diametral pitch. Specifically, fault metrics such as FMO, FM4 and Damage Index are compared for a variety of rpm cases as well as gear design geometries. To simulate the spur gear dynamics, a detailed mesh model of where the gear teeth are in contact is developed with and without damage that accounts for local variations in surface geometry and force distribution. Results indicate that vibration fault metrics commonly used for transmission diagnostics are dependent on some fundamental gear design parameters. This is important because it may imply that certain gear designs will be more sensitive to damage than others.

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Dokumentinformationen

Titel :

Sensitivity of vibration-based fault metrics to spur gear crack damage and diametral pitch variations

Weitere Titelangaben:

Empfindlichkeit schwingungsbasierter Fehlermaße bei Schäden durch Rißbildung in Geradzahnstirnradgetrieben und diametrale Variationen in der Wälzebene

Beteiligte:

Liu, Lin (Autor:in) / Pines, Darryll J. (Autor:in)

Erschienen in:

Journal of the American Helicopter Society ; 49 , 3 ; 288-299

Erscheinungsdatum :

2004

Format / Umfang :

12 Seiten, 23 Bilder, 1 Tabelle, 30 Quellen

ISSN :

0002-8711

DOI :

https://doi.org/10.4050/JAHS.49.288