Publication:
Preliminary vibration survey of a suspended full-scale OH-6A helicopter from 0 to 45 HZ

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Authors
Harris, John H., III
Subjects
Helicopter
Vibration analysis
Vibration testing
Natural frequencies
Mode shapes
Structural damping
Vibration forced response
Structural dynamics
Advisors
Wood, E. Roberts
Gordis, Joshua H.
Date of Issue
1996-03
Date
March 1996
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
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.
Type
Thesis
Description
Series/Report No
Department
Department of Aeronautics and Astronautics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
64 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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