An Efficient Direct Measurement Mode Survey Test Procedure

Abstract

An efficient, direct measurement, mode survey test procedure is presented. The procedure derives from the recognition that single-shaker frequency response functions of a linear, elastic structures can be scaled and summed to yield frequency response functions corresponding to multiple-shaker excitation. Thus, the operations to establish the multiple force levels needed to isolate modes for measurement can be performed numerically on a small laboratory computer/data acquisition system. In addition, this also introduces the possibility of numerically identifying mode parameters from single-shaker frequency response functions by using traditional sine-dwell testing techniques. Keywords: Dynamic models; Mode shapes; Structural response; Vibration; Normal modes; Identification; Modal survey testing; Experimental; Sine Dwell; Random.

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Document Details

Document Type
Technical Report
Publication Date
Jun 30, 1988
Accession Number
ADA204077

Entities

People

  • Alvar M. Kabe

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • C4I
  • Space

DTIC Thesaurus Topics

  • Acquisition
  • Air Force
  • Availability
  • Classification
  • Curve Fitting
  • Data Acquisition
  • Equations
  • Excitation
  • Frequency
  • Frequency Response
  • Identification
  • Measurement
  • Plastic Explosives
  • Resonant Frequency
  • Security
  • Simulations
  • Transfer Functions

Readers

  • Computational Modeling and Simulation
  • Structural Dynamics.
  • Systems Analysis and Design