US4402069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic envelope having minimal vibration and flow induced noises
Assignee: United States Department of the Navy
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Filing: 1981-06-03
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Granted: 1983-08-30
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Expires: 2001-06-03
Abstract
Abstract An acoustic envelope is provided which may include a tubular sheath which mounted about a conducting element. The tubular sheath has inner and outer tubular portions which are integral with respect to one another. The acoustic envelope further includes a plurality of non-elastic strands which extend longitudinally along the sheath between the inner and outer tubular portions and which are bonded thereto. The tubular sheath is constructed of a material which optimally minimizes vibration induced noise and flow induced noise when the line array is towed through the water.
Inventors
- 👤 Howard A. Miller
- 👤 Charles S. Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:29
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/20; G01V1/201
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
A towed line sonar array comprising: elongated conducting means; only one tubular sheath; said one tubular sheath being mounted in an engaging relationship about and along the elongated conducting means; the tubular sheath having inner and outer tubular portions which are integral with respect to one another; a plurality of non-elastic strands extending longitudinally along the sheath between the inner and outer tubular portions and being bonded thereto; and the sheath being a material with a Youngs modulus of elasticity from two times 10 7 to one times 10 8 Pascals and a damping factor greater than 0.4 in a frequency range from 11 Hz to 110 Hz and in a temperature range from 0° to 20° C. so that the sheath has high radial compliance and high acoustic damping properties.
Claim 2
Dependent Claim
131 words
A towed line sonar array comprising: elongated conducting means; only one tubular sheath; said one tubular sheath being mounted in an engaging relationship about and along the elongated conducting means; the tubular sheath having inner and outer tubular portions which are integral with respect to one another; a plurality of non-elastic strands extending longitudinally along the sheath between the inner and outer tubular portions and being bonded thereto; and the sheath being a material with a Youngs modulus of elasticity from two times 10 7 to one times 10 8 Pascals and a damping factor greater than 0.4 in a frequency range from 11 Hz to 110 Hz and in a temperature range from 0° to 20° C. so that the sheath has high radial compliance and high acoustic damping properties.
Claim 3
Dependent Claim
29 words
A towed line sonar array as claimed in claim 1 wherein: the non-elastic strands are aramid; and the aramid strands are substantially equispaced about and from the conducting means.
Claim 4
Dependent Claim
17 words
A towed line sonar array as claimed in claim 1 wherein: the tubular sheath is butyl rubber.
Claim 5
Dependent Claim
29 words
A towed line sonar array as claimed in claim 3 wherein: the non-elastic strands are aramid; and the aramid strands are substantially equispaced about and from the conducting means.
Claim 6
Dependent Claim
19 words
A towed line sonar array as claimed in claim 3 wherein: the inner and outer portions are vulcanized portions.
Claim 7
Dependent Claim
28 words
A towed line array as claimed in claim 5 wherein: the non-elastic strands are aramid; and the aramid strands are substantially equispaced about and from the conducting means.
Claim 8
Dependent Claim
124 words
A towed line sonar array consisting essentially of: a core of elongated conducting means; an acoustic envelope; the acoustic envelope including a single tubular sheath which is mounted in an engaging relationship about the conducting means with the conducting means located centrally therein; the tubular sheath having inner and outer tubular portions which are integral with respect to one another; the acoustic envelope further including a plurality of non-elastic strands extending longitudinally along the sheath between the inner and outer tubular portions and being bonded thereto; the non-elastic strands being equispaced about and from the conducting means; and the tubular sheath being constructed of a material which optimally minimizes vibration induced noise and flow induced noise when the line array is towed through water.
Claim 9
Dependent Claim
124 words
A towed line sonar array consisting essentially of: a core of elongated conducting means; an acoustic envelope; the acoustic envelope including a single tubular sheath which is mounted in an engaging relationship about the conducting means with the conducting means located centrally therein; the tubular sheath having inner and outer tubular portions which are integral with respect to one another; the acoustic envelope further including a plurality of non-elastic strands extending longitudinally along the sheath between the inner and outer tubular portions and being bonded thereto; the non-elastic strands being equispaced about and from the conducting means; and the tubular sheath being constructed of a material which optimally minimizes vibration induced noise and flow induced noise when the line array is towed through water.
Claim 10
Dependent Claim
62 words
A towed array as claimed in claim 7 consisting essentially of: the tubular sheath being a material which has a Young's modulus of elasticity from two times 10 7 to one times 10 8 Pascals and a damping factor greater than 0.4 in a frequency range from 11 Hz to 110 Hz and in a temperature range from 0° to 20° C.
Claim 11
Dependent Claim
23 words
A towed array as claimed in claim 8 consisting essentially of: the tubular sheath being butyl rubber; and the non-elastic strands being aramid.
Claim 12
Dependent Claim
19 words
A towed array as claimed in claim 9 consisting essentially of: the conducting means being transducer elements and wires.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |