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http://dx.doi.org/10.5050/KSNVE.2012.22.2.187

Dynamic Characteristic Analyses of a Bearingless Helicopter Rotor System  

Kee, Young-Jung (한국항공우주연구원)
Yun, Chul-Yong (한국항공우주연구원)
Kim, Doeg-Kwan (한국항공우주연구원)
Kim, Seung-Ho (한국항공우주연구원)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.22, no.2, 2012 , pp. 187-192 More about this Journal
Abstract
Recently, KARI(Korea Aerospace Research Institute) has been developing a modern 11.5 m diameter four bladed bearingless main rotor system, and this rotor system can be used for 7,000 lb class helicopter. Flexbeam and torque tube can be considered as key structural components, and large elastic twist of flexbeam induced by pitch control motion of torque tube can influence the nonlinear aeroelastic behavior. In this paper, the dynamic characteristic analysis results of bearingless rotor system were presented. In order to construct a input model and validate the analysis procedures, calculated results using the comprehensive helicopter analysis program CAMRAD II were compared with the measured natural frequencies and lag damping data from small-scale wind tunnel test. Next, the analysis model was extended to a full-scale model, and the dynamic analysis results were presented.
Keywords
Bearingless Rotor; Flexbeam; Torque Tube; Dynamic Characteristic; Snubber-damper; Helicopter;
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