초록 ▼

A flexbeam having matched in-plane and out-of-plane stiffness is described extending at least partway between the tips of a pair of rotor blades bonded thereto. The flexbeam so constituted produces a blade system with a primary in-plane frequency less than the primary forcing frequency. The matched

A flexbeam having matched in-plane and out-of-plane stiffness is described extending at least partway between the tips of a pair of rotor blades bonded thereto. The flexbeam so constituted produces a blade system with a primary in-plane frequency less than the primary forcing frequency. The matched stiffness of the flexbeam is provided by admixing, either compositionally or by laminating, materials of differing flexibilities to produce a high damping material of symmetrical stiffness.

대표청구항 ▼

A rotary blade system comprising a composite flexbeam with in-plane and out-of-plane stiffnesses approximately equal extending between and connected to at least two rotor blades, the flexbeam having an essentially symmetrical cross-section and extending at least the entire length of the inboard port

A rotary blade system comprising a composite flexbeam with in-plane and out-of-plane stiffnesses approximately equal extending between and connected to at least two rotor blades, the flexbeam having an essentially symmetrical cross-section and extending at least the entire length of the inboard portion of the blades and the blades securely affixed to the flexbeam at the outboard portion of the blades, the blade system having a primary in-plane frequency less than the primary rotor frequency.