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Modal Failure Analysis of a Gear and Drive Ring Assembly

05FTM12

Author: Darwin D. Behlke, Twin Disc, Incorporated
After years of successful reliable applications, a component failure on a new application cannot be explained
with static stress analyses,modal failure analysesmay be required. Finite elementmodal analyses was used
to identify themode and its frequency that cause a high range gear and drive ring assembly to fail prematurely.
ACampbell Diagramwas used to identifymodes in the operating range of a six--speed transmission that could
cause the drive ring to fail. Redesigning the assembly tomove the criticalmodes out of the operating range is
described.
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