Synchronous Averaging of Helicopter Tail Rotor Gearbox Vibration: Phase Reference Considerations.

摘要: Abstract : Synchronous averaging requires an accurate phase reference (tachometer) signal. In helicopter transmissions, such a signal can usually be obtained or derived from engine main rotor gearbox accessory, but is not as readily available for the tail gearbox. This report examines whether separate necessary by investigating relative jitter, due to dynamic drive shaft twist, between signals and gearboxes in S7OA-9 Black Hawk helicopter.