Determination of Fixed Base Natural Frequencies of Dual Foundation Shipboard Equipments by Shake Tests

Abstract

The report investigates the application of resonance testing to determine the fixed base natural frequencies of an in-place shipboard equipment-foundation system which is supported at two base points. Translation of the base points can cause the structure to rotate as it translates. A method was previously proposed which required the simultaneous use of two shakers capable of phase control and a range of force ratios at each driving frequency; this method would be quite difficult and expensive to apply in the field. A new technique is proposed herein which requires only one shaker to be applied at a time, thereby reducing the difficulties and restrictions considerably. An application of the technique to a theoretical system, and an analog simulation of a shake test utilizing the new method are presented.

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Document Details

Document Type
Technical Report
Publication Date
Aug 23, 1966
Accession Number
AD0639912

Entities

People

  • G. J. O'hara
  • L. P. Petak

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Analog Computers
  • Buildings And Structures
  • Classification
  • Crossings
  • Equations
  • Equations Of Motion
  • Frequency
  • Phase Control
  • Resonance
  • Resonant Frequency
  • Security
  • Shipboard
  • Shock Response Spectra
  • Shock Tests
  • Simulations
  • Spectra
  • Translations

Fields of Study

  • Engineering

Readers

  • Aerospace Test and Evaluation
  • Control Systems Engineering.
  • Economics