Preliminary Vibration Survey of a Suspended Full-Scale OH-6A Helicopter from 0 to 45 Hz.

Abstract

Efforts to establish a helicopter research program in structural dynamics at NPS were greatly enhanced when the U. S. Army donated two OH-6A light observation helicopters. One of the helicopters is reserved for ground vibration testing and dynamics research. Vibration measurements are extremely important in predicting and understanding an aircraft's dynamic behavior and durability. A comparison of a helicopters natural frequencies and those frequencies transmitted to the airframe through the rotor system can alert the designer/evaluator to possible dynamic problems. This thesis establishes a baseline vibration test program on the OH-6A helicopter for future testing and comparison to analytic models. The goal of the research is to establish natural frequencies (eigenvalues) principal mode shapes (eigenvectors), and damping characteristics of the OH-6A and to compare these values to test and analytical data obtained from the McDonnell Douglas Helicopter Company.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1996
Accession Number
ADA310775

Entities

People

  • John H. Harris Iii

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Airframes
  • Dynamics
  • Eigenvalues
  • Eigenvectors
  • Frequency
  • Helicopters
  • Observation
  • Observation Aircraft
  • Resonant Frequency
  • Vibration

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Structural Dynamics.