초록 ▼

An apparatus for attenuating low frequency sound in a high static pressure environment comprises a hollow, tube-shaped structure having two, free-bending spans disposed opposite each other and enclosed in an evacuated thin plastic envelope or bag. Each of the hinged spans has a flexural strength exc

An apparatus for attenuating low frequency sound in a high static pressure environment comprises a hollow, tube-shaped structure having two, free-bending spans disposed opposite each other and enclosed in an evacuated thin plastic envelope or bag. Each of the hinged spans has a flexural strength exceeding 200,000 psi and an elastic modulus exceeding 20,000,000 psi. The shape of the spans can be planar or curved, and the ends of the spans are closed. The spans having a planar cross section are supported adjacent their peripheries by T-shaped members, each of which includes an inwardly projecting flange which contacts and supports the spans. The curved-span embodiment employ two suitably shaped plugs which contact and support the two ends of the spans.

대표청구항 ▼

An apparatus for attenuating low frequency sound underwater in a hydrostatic pressure environment, the apparatus comprising: a hollow, tube-shaped structure having two, free-bending, resonant spans, each span having four edges at its periphery, said spans having flexed and unflexed states and dispos

An apparatus for attenuating low frequency sound underwater in a hydrostatic pressure environment, the apparatus comprising: a hollow, tube-shaped structure having two, free-bending, resonant spans, each span having four edges at its periphery, said spans having flexed and unflexed states and disposed a preselected distance opposite each other during their unflexed state, edge members in contact with but not affixed to the four edges of both spans and supporting said spans adjacent their peripheries on all four edges, each span having a flexural strength which exceeds the flexural stress when loaded by hydrostatic pressure and the spans are touching each other during the flexed state, and an elastic yield point higher than the strain imposed by deflection of the span in response to hydrostatic pressure.