Transmission Acoustic Vibration Testing.
Final rept. Sep 82-Nov 83,
UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV
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Laboratory tests were conducted to determine the individual and combined effects of a high contact ratio HCR planetary gearset and a stainless steel housing on the acoustic high frequency vibration signature of the BLACK HAWK helicopter main transmission. Vibration levels at the planetary mesh frequency increased significantly with the stainless steel housing, but increased unexpectedly with the HCR planetary. The primary reason for the increased response with the HCR was the reduced gear face widths. Keywords UH-60A aircraft Planetary gears Gear teeth Helicopter transmissions High contact ratio gears Buttress Tooth gears Gear mesh frequency Acoustic vibration.