公开(公告)号：US20220169369A1

公开(公告)日：2022-06-02

申请号：US17106481

申请日：2020-11-30

Applicant: Bell Textron Inc.

Inventor： Alexander Dang Quang Truong ,  Bradley Joseph Passe

IPC: B64C27/00

Abstract: In an embodiment, an aircraft includes a fuselage and a first support boom extending from the fuselage and having a first boom thickness. The aircraft also includes a first propulsion assembly coupled to the first support boom. The first propulsion assembly includes a first rotor hub and first rotor blades extending from the first rotor hub and operable to rotate in a first rotor plane with the first rotor hub. The aircraft also includes a first separation between the first rotor plane and the first support boom of not less than approximately 1.5 times the first boom thickness.

公开(公告)号：US20210403148A1

公开(公告)日：2021-12-30

申请号：US17154925

申请日：2021-01-21

Applicant: Bell Textron Inc.

Inventor： Frank Bradley Stamps ,  Michael Reaugh Smith ,  Bradley Joseph Passe

IPC: B64C27/00 ,  B64C27/22 ,  B64C11/00 ,  B64C27/10 ,  B64C27/54 ,  B64C3/18 ,  B64C1/06 ,  F16F15/167

Abstract: 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.