EXCITATION OF SIMPLE STRUCTURES WITH SMALL ROCKET MOTORS,

Abstract

Small rocket units were fired on a test beam in air and for the first time under water. Natural frequencies, mode shapes, and modal damping values were obtained from the resultant transient data. Steady-state tests were made on the test beam to provide a means of evaluating the results of the rocket tests. Natural frequencies obtained from the rocket tests agreed with steady-state test results within 6 percent. Relative amplitudes between accelerometers at the same filtered frequency obtained from the rocket tests and the steadystate tests were in good agreement. These tests are the first results of a program to investigate the feasibility of using impulsive excitation to determine the vibratory characteristics of naval structures. Further developmental work is required to overcome difficulties experienced in these tests and to develop techniques to identify the vibratory characteristics of larger and more complex structures. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1965
Accession Number
AD0623898

Entities

People

  • John G. Viner

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Accelerometers
  • Agreements
  • Excitation
  • Frequency
  • Resonant Frequency
  • Rocket Engines
  • Rockets
  • Steady State

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Structural Dynamics.
  • Systems Analysis and Design