초록 ▼

An improved helicopter rotor flexbeam (20) comprises a pair of generally parallel outwardly open, cross-sectionally C-shaped beams (25) of a geometry which defines therein a first inboard region (A) of enhanced out-of-plane flexibility and a second outboard region (B) of enhanced in-plane and torsio

An improved helicopter rotor flexbeam (20) comprises a pair of generally parallel outwardly open, cross-sectionally C-shaped beams (25) of a geometry which defines therein a first inboard region (A) of enhanced out-of-plane flexibility and a second outboard region (B) of enhanced in-plane and torsional flexibility.

대표청구항 ▼

A flexbeam of enhanced out-of-plane, in-plane and torsional flexibility, for mounting a helicopter rotor blade to a hub therefor, said flexbeam being characterized by: first and second generally parallel, spaced beams adapted for accommodating therebetween, a pitch change shaft disposed generally pa

A flexbeam of enhanced out-of-plane, in-plane and torsional flexibility, for mounting a helicopter rotor blade to a hub therefor, said flexbeam being characterized by: first and second generally parallel, spaced beams adapted for accommodating therebetween, a pitch change shaft disposed generally parallel thereto and generally coplanar therewith; each of said beams including an inboard root end, an outboard tip end and adjacent inboard and outboard regions disposed therebetween: said inboard region being of a first geometry and having a first characteristic stiffness which, under dynamic operating conditions, renders said inboard region more compliant than said outboard region in an out-of-plane mode of vibration; and said outboard region being of a second geometry and having a second characteristic stiffness which, under dynamic operating conditions, renders said outboard region more compliant than said inboard region in in-plane and torsional modes of vibration, whereby the natural frequencies of vibration of said flexbeam in said in-plane and out-of-plane modes may be spaced from one another, below the range of frequencies of rotor rotation.