Effects of Blade‐to‐Blade Dissimilarities on Rotor‐Body Lead‐Lag Dynamics

Author: McNulty, Michael J.

Source: Journal of the American Helicopter Society, Volume 33, Number 1, 1 January 1988 , pp. 17-28(12)

Publisher: AHS International

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Small blade‐to‐blade property differences are investigated to determine how they affect the behavior of a simple rotor‐body system. An analytical approach is used which emphasizes the significance of these effects from the experimental point of view. It is found that the primary effect of blade‐to‐blade dissimilarities is the appearance of additional peaks in the frequency spectrum which are separated from the conventional response peaks by multiples of the rotor speed. These additional responses are potential experimental problems because when they occur near a mode of interest they act as contaminant frequencies which can make damping measurements difficult. Increased rotor‐body coupling and a rotor shaft degree of freedom act to improve the situation by altering the frequency separation of the modes.

Document Type: Research Article

DOI: http://dx.doi.org/10.4050/JAHS.33.17

Publication date: January 1, 1988

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