Vibration isolation systems for compound helicopters

A compound helicopter includes a fuselage including a fuselage airframe, a translational thrust system coupled to the fuselage airframe and a pylon assembly subject to vibration. The pylon assembly includes a transmission and a rotor system having a main rotor assembly. The compound helicopter also...

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Bibliographic Details
Main Authors Passe, Bradley Joseph, Stamps, Frank Bradley, Smith, Michael Reaugh
Format Patent
LanguageEnglish
Published 19.03.2024
Subjects
AEROPLANES
AIRCRAFT
AVIATION
BLASTING
COSMONAUTICS
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HELICOPTERS
LIGHTING
MEANS FOR DAMPING VIBRATION
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
SHOCK-ABSORBERS
SPRINGS
THERMAL INSULATION IN GENERAL
TRANSPORTING
WEAPONS
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Summary:A compound helicopter includes a fuselage including a fuselage airframe, a translational thrust system coupled to the fuselage airframe and a pylon assembly subject to vibration. The pylon assembly includes a transmission and a rotor system having a main rotor assembly. The compound helicopter also includes a main rotor vibration isolation system including a plurality of augmented liquid inertia vibration eliminator units each having an isolation frequency and each coupled between the fuselage airframe and the pylon assembly to reduce transmission of the pylon assembly vibration to the fuselage airframe at the isolation frequency. Each augmented liquid inertia vibration eliminator unit includes at least one active tuning element movable to tune the isolation frequency thereof.
Bibliography:Application Number: US202117154925