摘要: This report pertains to engine/airframe/drive train dynamic interface problems experienced by helicopters and the methodology used to avoid dynamic interface problems. The problem of low torsional frequency of the engine/airframe/... 展开 This report pertains to engine/airframe/drive train dynamic interface problems experienced by helicopters and the methodology used to avoid dynamic interface problems. The problem of low torsional frequency of the engine/airframe/drive train dynamic system that results from the design philosophy of using a stationary main rotor mast enclosing a separate 'floating' torque drive shaft is addressed. The use of supercritical shafts and vibration isolators are described and mobility methods to preclude engine/airframe vibration problems are discussed. 收起