DI-HFAC-81203

Hull Mounted Sonar Self-Noise Report

The Hull Mounted Sonar Self-Noise Control Report provides consolidated design information used by the Government to verify Contractor efforts are consistent with the specified Sonar Self-Noise Control Report.

Approval DateMay 3, 1991

AMSC NumberA6128

Preparing Activity—

Project Number—

OPRN SEA 55N3

DTIC Applicable—

GIDEP Applicable—

Limitation—

Applicable Forms—

Approval Limitation—

Form VersionJUN 86

DID Formatdd_form_1664

963C CompliantNo

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

Supersedes

—

Description & Purpose

The Hull Mounted Sonar Self-Noise Control Report provides consolidated design information used by the Government to verify that Contractor efforts are consistent with the specified Sonar Self-Noise Control Report.

Application & Interrelationship

This Data Item Description (DID) contains the format and content preparation instructions for the data product generated by the specific and discrete task requirement as delineated in the contract.

Use & Relationship

—

Preparation Instructions

10.1Format.The Hull Mounted Sonar Self-Noise Control Report shall be in the Contractor's format.

10.2Content.The Hull Mounted Sonar Self-Noise Control Report shall identify and characterize machinery and equipment (such as size, location relative to sonar transducers, horsepower, RPM, and capacity) representing potential sources of sonar self-noise (noise-critical machinery). Noise critical machinery shall include propulsion diesel generators, ship service diesel generators, air conditioning machinery, refrigeration plants, air compressors, purifiers, sea connected pumps, non-seaconnected pumps greater than 1/2 hp, sewage treatment machinery complex, engine room exhaust fans, plus other auxiliary machinery units located within 40 feet of sonar transducers and driven by motors of power rating greater than 1/2 hp.

10.2.1The mounting system shall be characterized for each resiliently mounted noise source.The mount manufacturer, size, model, and loading, and all flexible connections to the mounted unit shall be identified.

10.2.2Calculations shall be identified which demonstrate thatmachinery noise isolation and machinery-to-sonar separation distances are such that the total noise level at the sonar requirement in the specifications are met.

10.2.3Line diagrams and sketches of each system containing noise critical machinery shall be included showing all noise control features to be installed.The diagrams shall contain sufficient installation information on noise control features for training, production accomplishment, and inspection verification.

10.2.4Results of resonance avoidance analyses for each foundation, as required by the specifications, shall be included.Assumptions and analysis procedures shall be clearly defined and a sample calculation included. Forcing frequencies and calculated foundation resonances shall be identified.

10.2.5For piping penetrations within 20 feet ofsonar transducers or piping penetrations of structural bulkheads below the waterline and adjacent to the sonar receivers, the separation distances from the sonar transducers and distance to the hull shall be identified and the location, type, and extent of any damping treatments shall be described.

References

—

Schema v3.0Community-maintained · Verify against ASSIST

Community-maintained — not an official government database.
Verify against ASSIST·GitHub·About·Disclaimer