Accession Number:

ADA224010

Title:

Hydromechanical Study of a JHU/APL Minispar

Descriptive Note:

Technical rept.

Corporate Author:

DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP HYDROMECHANICS DEPT

Personal Author(s):

• Wisler, B. B.
• Hamilton, J. H.

Report Date:

1990-06-01

Pagination or Media Count:

49.0

Abstract:

A prototype Minispar sensor system housing was attached to a simulated grate section and towed at various angles of attack and speeds in a towing basin. This was done to aid JHUAPL in evaluating the attachment hardware for structural strength. Measurements of strains at various locations on the attachment hardware were made along with bolt torques and the forward to aft pressure differential on the model. The hydrodynamically induced strains were less than 400 microstrains. Bolt torque induced strains in excess of 1900 microstrains were measured initially. Modifications of the attachment hardware reduced the bolt torque induced strains to less than 400 microstrains, keeping the total strain below the elastic limit for the structural material of the Minispar framework. Keywords Underwater equipmenthousings Towed bodies Strain mechanics Towingtorque tests BoH torque induced strains Hydrodynamically induced strains.

Descriptors:

• *HOUSINGS
• *SPARS
• *TOWED BODIES
• STRUCTURAL PROPERTIES
• MATERIALS
• ELASTIC PROPERTIES
• STRAIN(MECHANICS)
• ANGLE OF ATTACK
• STRENGTH(MECHANICS)
• LIMITATIONS
• PRESSURE
• ATTACHMENT
• TORQUE
• BOLTS
• TOWING
• HYDROMECHANICS
• MODEL BASINS
• UNDERWATER EQUIPMENT
• DETECTORS
• MECHANICAL PROPERTIES
• TEST AND EVALUATION
• MEASUREMENT

Subject Categories:

• Machinery and Tools
• Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE