Jeong H. Sa , Young H. You , Jae S. Park , Soo H. Park and Sung N. Jung
International Journal of Aeronautical and Space Sicences, vol. 13, no. 3, pp.349-360, 2012

Abstract : In this study, the accuracy of CSD (Comprehensive Structural Dynamics) analysis on the estimation of blade aeroelastic responses and structural loads of the HART II baseline rotor is assessed using a comprehensive rotorcraft dynamics code, CAMRAD II, and a nonlinear flexible multi-body dynamics analysis code, DYMORE. Due to the lack of sufficient measurement data for HART II airloads, prescribed airloads computed by a three-dimensional compressible flow solver KFLOW are used to replace the lifting-line airloads and thereby enhance the prediction capability of the comprehensive analyses. The CSD results on blade elastic deflections using the prescribed airloads indicate more oscillatory behavior than those by lifting-line based approaches, but this wave pattern becomes improved with the inclusion of artificial damping into the rotor system. It is demonstrated that the structural load predictions are improved significantly by the prescribed airloads approach against the measured data, as compared with an isolated CSD analysis

Keyword : HART II rotor, comprehensive code, prescribed airloads, artificial damping