Hydromechanical Study of a JHU/APL Minispar

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 JHU/APL 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 equipment/housings; Towed bodies; Strain mechanics; Towing/torque tests; BoH torque induced strains; Hydrodynamically induced strains.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1990
Accession Number
ADA224010

Entities

People

  • B. B. Wisler
  • J. H. Hamilton

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Human Systems
  • Sensors

DTIC Thesaurus Topics

  • Attachment
  • Carriages
  • Classification
  • Fiberglass
  • Gages
  • Hydromechanics
  • Instrumentation
  • Materials
  • Materials Engineering
  • Measurement
  • Physics Laboratories
  • Pressure Distribution
  • Pressure Measurement
  • Pull Tests
  • Resistors
  • Security
  • Strain Gages

Fields of Study

  • Physics

Readers

  • Logistics and Supply Chain Management.
  • Mechanical Engineering/Mechanics of Materials.