High damping limp propeller

Details High damping limp propeller High damping limp propeller

1992-09-30

1993-12-14

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Axially extending shroud ring or casing

416191, 416226, 416230, 416240, F04D 2918

Patent

active

052696561

ABSTRACT:
A limp propeller for underwater use with a high mechanical damping ability o absorb so-called broadband vibration noise is comprised of a fabric-like material, preferably made of braided high tensile strength material such as fiberglass or graphite fibers. The fabric is devoid of any stiffening plastic or epoxy matrix material. Rather a flexible matrix material having relatively large hysteretic losses when deformed o cyclically in place of the stiffening plastic or epoxy matrix, or no matrix material at all is used in the present invention. The flexible matrix material or the complete absence of any matrix material renders the propeller blade relatively limp to flexure, thereby reducing its acoustic radiation damping or radiation efficiency.

REFERENCES:
patent: 652123 (1900-06-01), Lavigne
patent: 2426742 (1947-09-01), Pawlowski
patent: 2584663 (1952-02-01), Bensen
patent: 3597108 (1971-08-01), Mercer et al.
patent: 4097193 (1978-06-01), Briinsch et al.
patent: 4370096 (1983-01-01), Church
patent: 4797066 (1989-01-01), Stromberg
patent: 5108262 (1992-04-01), Crane
patent: 5145320 (1992-09-01), Blake et al.

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