Spectral decontamination of a real-time helicopter simulationNonlinear mathematical models of a rotor system, referred to as rotating blade-element models, produce steady-state, high-frequency harmonics of significant magnitude. In a discrete simulation model, certain of these harmonics may be incompatible with realistic real-time computational constraints because of their aliasing into the operational low-pass region. However, the energy is an aliased harmonic may be suppressed by increasing the computation rate of an isolated, causal nonlinearity and using an appropriate filter. This decontamination technique is applied to Sikorsky's real-time model of the Black Hawk helicopter, as supplied to NASA for handling-qualities investigations.
Document ID
19830054993
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mcfarland, R. E. (NASA Ames Research Center Moffett Field, CA, United States)