DYNAMICS AND VIBRATION OF NEW GENERATION AVIATION ENGINES

摘要

So the noise emitted from the engine air intakes high bypass ratio in the far field and thedirection of the wall of the fuselage consists of multiple tones frequencies, which was alsoobserved in the spectrum of the noise of the front passenger compartment of aircrafts -demonstrators QTD1 and QTD2.Solving of community noise problems probably require shift in emphasis from traditionalmethods (installation of liners, which are required with a wide variety and increased height)on methods of noise control at the source (wide chord fan blades, blisc technology, actuators).Solving problems of structural noise low-frequency part of the spectrum will require a newgeneration of engine mounts (probably with built low-frequency vibration isolation units orpiezoelectric actuators).Experience in operating aircraft with engines high bypass ratio shows that the level of lowfrequencycomponents structural noise in the cockpit crew may exceed the recommendationsof sanitary norms and raise questions about safety, and we expect ahead second (Advance)and third (UltraFan) generations of geared engines and can be «Open rotor».