The vibration absorber tuned adaptavelmente for noise reduction in the cabin of the aircraft

摘要

Invention patent: b "vibration absorber tuned adaptively to reduce ruu00ecdo in cabin of aircraft" d .An aircraft engine is attached to the fuselage by a mounting structure which has a vibration absorber system which includes first and second sensors to produce signals which indicate the vibrationAlong the two orthogonal axes. A third sensor, such as an accelerometer is coupled to the mounting structure to detect the vibration of the engine.A tachometer circuit, connected to the third sensor, produces first and second speed signs that indicate the speeds of two rotating drums in the engine.Four observers to vibration are fixed to the assembly structure of the engine.And are equipped with controllers for tuning the resonant frequ00b3u00eancia dynamically each vibration absorber in response to a unique combination of one of the two vibration signals with one of theIs speed signs.Consequ00b3entemente, vibration absorbers reduce vibrations of a reel motor which are transmitted through the assembly structure along two orthogonal axes.The frequ00b3u00eancia resonant of each absorber is changed to track variation of vibrations caused by changes of engine speed.