Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting
Patent
1977-02-03
1979-01-23
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Nonmetallic resilient mounting
416141, B64C 2738
Patent
active
041358562
ABSTRACT:
A rotor blade retention system connects an elongated rotor blade to a rotor hub that is rotatable about its central axis. The connected rotor blade normally extends generally radially from the hub and is rotatable with the hub. The retention system includes a pair of bearings that are interconnected in parallel load transmitting relationship. Both bearings are connected in serial load transmitting relationship with a flap hinge. One bearing is relatively stiff along the longitudinal axis of the rotor blade and is less stiff in directions transverse to the longitudinal blade axis. The other bearing is most stiff in directions transverse to the rotor blade axis and is less stiff along the axis. Both bearings define effective elastic centers which are located along the longitudinal blade axis, but the two elastic centers are spaced from each other. The two bearings accommodate lead-lag motions of the rotor blade. Because of the relative stiffnesses of the bearings in directions transverse to the longitudinal axis of the rotor blade, the axis about which lead-lag motion occurs is displaced from the effective elastic center of the bearing that has its greatest stiffness along the longitudinal blade axis. The displacement of the lead-lag axis causes the bearing, and the retention system, to appear relatively stiff in response to lead-lag motions. The stiffness of the blade retention system in response to flapping motions of the rotor blade is not affected, however, because the serially connected flap hinge accommodates most of the flapping motion in preference to the bearings. Since the retention system is relatively stiff in response to lead-lag motions, less damping is required at the natural frequencies of lead-lag motion. The required damping may be provided entirely by material incorporated into the bearings and without the use of an auxiliary lead-lag damper.
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Lord Corporation
Powell Jr. Everette A.
Salada Maurice R.
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