Evaluation of the effect of elastomeric damping material on the stability of a bearingless main rotor systemThe considered investigation was conducted in connection with a contract to design, fabricate, and test a prototype bearingless main rotor (BMR) system. Part of the design process involved an aeroelastic stability investigation in a wind tunnel. Attention is given to a description of model testing, model test results, the description of the full scale wind tunnel configuration, full scale test results, and aspects of correlation with theory. It was found that the complex geometry of the BMR, with 12.5 degrees of nose-up prepitch at the hub and 2.5 degrees of tip-up predroop at the blade attachment clevis, is required to achieve a stable configuration. Subsequent model testing showed that a constrained layer of elastomer material could increase stability at all rotor speeds and collectives tested for a flat strap configuration.
Document ID
19820042859
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sheffler, M. (Boeing Vertol Co. Philadelphia, PA, United States)
Staley, J. (Boeing Vertol Co. Philadelphia, PA, United States)
Warmbrodt, W. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1980
Subject Category
Aircraft Design, Testing And Performance
Meeting Information
Meeting: National Specialists Meeting on Rotor System Design