Skip to main content

Vertical‐Plane Pendulum Absorbers for Minimizing Helicopter Vibratory Loads

Buy Article:

$30.00 plus tax (Refund Policy)

Abstract:

This paper discusses the use of pendulum dynamic absorbers mounted on the blade root and operating in the vertical plane to minimize helicopter vibratory loads. The paper describes qualitatively the concept of the dynamic absorbers and presents results of analytical studies and flight tests showing the degree of reduction in vibratory loads attainable. Operational experience of vertical plane dynamic absorbers on the OH‐6A helicopter is also discussed. Other approaches evaluated included providing control of blade first and second mode natural frequencies by means of anti‐node weights and by use of preloaded internal cables. Flight tests did not show these methods to be sufficiently effective. Hub‐mounted vertical plane pendulums were flown and proved to be effective, but considerations of drag and weight were unfavorable for this configuration. Fuselage‐mounted non‐rotating dampers were eliminated because of the difficulty of tuning to a sufficiently wide range of frequency. Fuselage‐mounted centrifugal pendulum dampers were considered impractical from the standpoint of space requirements and mechanical complexity.

Document Type: Research Article

DOI: https://doi.org/10.4050/JAHS.19.44

Affiliations: Hughes Helicopters, Culver City, California

Publication date: 1974-10-01

More about this publication?
  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

    Journal subscribers who are AHS members log in here if you are not already logged in.

    Authors can find submission guidelines and related information on the AHS website.

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more