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• W2017262125 abstract "A combination of analytic modeling and system identification methods have been used to develop an improved dynamic model describing the response of articulated rotor helicopters to control inputs. A high-order linearized model of coupled rotor/body dynamics with literal coefficients is compared to flight test data from single rotor helicopters in the near hover trim condition. The identification problem was formulated using the maximum likelihood function in the time domain. The dynamic model with literal coefficients was used to generate the model states, and the model was parameterized in terms of physical constants of the aircraft rather than the stability derivatives, resulting in a significant reduction in the number of quantities to be identified. The likelihood function was maximized using the genetic algorithm approach. This method proved highly effective in producing an estimated model from flight test data which included coupled fuselage/rotor dynamics. Interpreting these results, it is shown that blade flexibility is a significant contributing factor to the discrepancies between theory and experiment shown in this and previous studies. Addition of flexible modes, properly incorporating the constraint due to the lag dampers, results in excellent agreement between flight tests and theory, especially in the high frequency range." @default.
• W2017262125 created "2016-06-24" @default.
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• W2017262125 date "1994-02-01" @default.
• W2017262125 modified "2023-09-27" @default.
• W2017262125 title "An analytic modeling and system identification study of rotor/fuselage dynamics at Hover" @default.
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• W2017262125 doi "https://doi.org/10.1016/0895-7177(94)90056-6" @default.
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