Abstract
In the recent decades, rotorcrafts have been examined and subjected to experimentation for higher harmonic control (HHC) for hub vibratory load reduction through hydraulic swashplate actuation, or individual blade control (IBC). This paper presents a design of a linear quadratic Gaussian (LQG) regulator based on the LTI representation of HART-II rotor and evaluate its controlled stability and sensitivity. Specifically, a linear quadratic control synthesis for vibration reduction using the revised IBC control inputs of N/rev and (N±1)/rev, which will enable a linear time-invariant identification of a rotor, is presented. The following aspects are detailed: (1) a multi-body aeroelasitc rotor analysis of the baseline HART-II and UH-60A rotor; (2) the LTI identification method; and (3) the design and simulation of LQG closed-loop vibratory load control law.
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