Advanced Development of a Helicopter Rotor Isolation System for Improved Reliability. Volume I. Summary Report.
Final rept. Jun 72-Feb 76,
KAMAN AEROSPACE CORP BLOOMFIELD CONN
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This report includes the results of the analytical and experimental phases of a helicopter rotor isolation reliability and maintainability R and M program on a UH-1 helicopter, which was modified through the addition of a Dynamic Antiresonant Vibration Isolator DAVI. The final flight test phase demonstrated that the DAVI-modified vehicle had substantially lower vibration levels than the standard vehicle. Vertically, the two-per-rev vibration level was reduced to less than one-fifth that of the standard vehicle through the transition speed range and less than one-half at high speeds. An R and M analysis indicated the Army could realize an annual cost savings of approximately 12,000,000 if 1000 Army UH-1Hs were equipped with DAVI isolation systems. This savings is predicated on the following assumptions 1 vibration-induced failures will be reduced in proportion to the vibration reduction afforded by the DAVI isolation system, and 2 the UH-1Hs are utilized at the rate of 20 flight-hours per month.