CH-53A Flexible Frame Vibration Analysis/Test Correlation

Abstract

The Sikorsky Finite Element Airframe Vibration Analysis (Fran/Vibration Analysis) has been found to correlate well with data taken in shake tests of the CH-53A. The frequencies of fundamental fuselage bending and transmission modes were predicted by the FRAN/Vibration Analyses to an average accuracy of three percent. In addition, the mode shapes were defined accurately. The modeling techniques and analysis used in the study can be applied during helicopter design and during evaluation of growth versions of current aircraft. These techniques, in combination with an accurate definition of the vehicle's structural characteristics, will enable accurate prediction of all transmission and fuselage modes for a vehicle without a cargo ramp.

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Document Details

Document Type
Technical Report
Publication Date
Mar 28, 1973
Accession Number
AD0772569

Entities

People

  • Irwin J. Keningsberg

Organizations

  • United Technologies Corporation

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Configurations
  • Aircrafts
  • Airframes
  • Civil Engineering
  • Computer Programs
  • Fuselages
  • Mathematical Models
  • Measurement
  • Physical Properties
  • Relative Motion
  • Resilience
  • Resonant Frequency
  • Test And Evaluation
  • Vehicles
  • Word Processors

Readers

  • Aerospace Engineering
  • Computational Modeling and Simulation