UNDERWAY VIBRATION SURVEY ON THE USS OKINAWA (LPH-3). A CASE STUDY OF SUPERSTRUCTURE VIBRATION

Abstract

An underway vibration survey was performed on USS OKINAWA (LPH-3) to establish critical frequencies and determine maximum vibratory levels of the hull, island, radar mast, main propulsion machinery, and Mark 63 Director 2. Free route (straight course) steady-speed runs were made in addition to hard turns, crashback maneuvers, and anchor drop tests. Large magnifications of athwartship vibration motion of the island-radar mast structure relative to the hull were noted for speeds above 85 rpm. The superstructure of OKINAWA influences the island and radar mast vibrations whose levels are important for the successful operation of electronic equipment mounted on these structures. Because of the characteristics of the superstructure, the ratio of the higher flexural hull frequencies to the fundamental frequency differs from that found on a number of other class vessels.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1966
Accession Number
AD0634996

Entities

People

  • Donald C. Robinson

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Bearings
  • Computer Programs
  • Drop Tests
  • Electronic Equipment
  • Flexible Couplings
  • Flight Decks
  • Instrumentation
  • Magnification
  • Masts
  • Measurement
  • Model Basins
  • Propellers
  • Propulsion Systems
  • Resonant Frequency
  • Ship Model Basins
  • Vibration
  • Word Processors

Fields of Study

  • Engineering

Readers

  • Marine Hydrodynamics
  • Naval Architecture and Marine Engineering.
  • Structural Dynamics.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems