Determination of Fixed-Base Natural Frequencies of a Composite Structures or Substructures: Experiment and Application.

Abstract

A generalized method, reported in NRL Report 7300, for determining the fixed-base natural frequencies of an in situ or laboratory mechanical structure or substructure is tested by experiments. The test structure was composed of a simple steel beam on three supports which were mounted on flexible members of a trusslike frame. The fixed-base natural frequencies of the lowest two modes of the test beam were determined by the aforementioned semianalytical method. Theoretical calculations and a standard resonance test were also performed for comparison. Results comfirmed the applicability and usefulness of the developed method, as predicted by the theoretical analysis. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 30, 1971
Accession Number
AD0737193

Entities

People

  • Chen-chou Ni
  • James P. Layher

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Buildings And Structures
  • Composite Materials
  • Composite Structures
  • Frequency
  • Mechanical Structure
  • Research Facilities
  • Resonance
  • Resonant Frequency

Readers

  • Aerospace Test and Evaluation
  • Structural Dynamics.