Identification of bearingless main rotor dynamic characteristics from frequency-response wind-tunnel test data

摘要

The control response dynamics of the Sikorsky Bearingless Main Rotor(SBMR)were determined from frequency-response test data in the NASA 40x80 foot wind tunnel. The CIFER~R(Comprehensive Identification from FrEquency Responses)tool was used to extract rotor's physical characteristics based on a linearized 9 degree-of-freedom analytical formulation of the SBMR dynamics. The paper reviews identification methods and results for two flight conditions(40 kts,μ=0.093; and 100 kts, μ=0.233), with particular emphasis placed on off-axis modeling.