After years of successful reliable applications, a component failure on a new application cannot be explained
with static stress analyses, modal failure analyses may be required. Finite element modal analyses was used
to identify the mode and its frequency that cause a high range gear and drive ring assembly to fail prematurely.
A Campbell Diagramwas used to identifly modes in the operating range of a six- speed transmission that could
cause the drive ring to fail. Redesigning the assembly to move the critical modes out of the operating range is
described.
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