Development of Rotor Control Equivalent Turbulence Input Models (RCETI) Using Urban Environment Airwake Models

A Rotor Control Equivalent Turbulence Input (RCETI) model for characterizing vehicle response in urban environments turbulent airwakes is investigated. By extracting transfer functions from the nonlinear, high fidelity UH-60 rotorcraft model implemented within the FLIGHTLAB®framework, vehicle response to vertical turbulence is evaluated and inverse mapping between the rotor hub thrust coefficient and the control input spectrum is determined. Furthermore, the RCETI methodology develops filters that produce time history samples of collective input that produce hub loads that are stochastically similar to those induced by atmospheric air wakes.