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Recommended Design Modifications to the CH-47 Forward Rotor-Drive Gearbox
MECHANICAL TECHNOLOGY INC LATHAM NY
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The report describes the results of a study of modifications to existing helicopter power-train hardware for the purpose of reducing acoustic- frequency vibrations and noise. Mechanical vibration analysis methods were put to further tests by applying them to the redesign of CH-47C gearbox components. This program was undertaken carefully and methodically to avoid the excessive costs which often accompany hit-or-miss approaches to gearbox noise reduction. The results include vibration reduction predictions for a number of carefully documented designs. The key products in this overall effort are reduced bearing radial dynamic forces thus, the results of this program are expected to have major impact upon bearing and gear lifetimes, in addition to the obvious benefits in the area of gearbox noise.
APPROVED FOR PUBLIC RELEASE