Research on measurement and control of helicopter rotor response using blade-mounted accelerometers 1990-91Wind tunnel testing of the full-size Model 412/IBC rotor performed at the NASA Ames Research Center is described. The use of blade-mounted accelerometers is found to be feasible for estimating or measuring blade flapping, lagging, and bending accelerations, rates, and displacements. Application of the imaginary swash plate concept to IBC systems leads to useful filtering of the blade accelerometer signals while permitting the control of a four-bladed rotor using measurements from any three blades. Rotor state measurements in the rotating system can be transformed to the corresponding nonrotating rotor states using the IBC algorithm with its associated filtering properties.
Document ID
19920073692
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ham, Norman D. (MIT Cambridge, MA, United States)
Mckillip, Robert M., Jr. (Princeton University NJ, United States)