Evaluation of Noseboom Sensors Correction Coefficients of the Flying Helicopter Simulator FHS

Abstract

The EC135 Flying Helicopter Simulator (FHS) of DLR is equipped with noseboom mounted sensors to enable mea- surements relatively unperturbed by rotor downwash effects. Remaining downwash disturbances on the static and dynamic pressure and the airflow angles are compensated for with correction coecients, derived with a variant of the Simultaneous Calibration of Aircraft Data System (SCADS) technique. The correction coefficients depend on the sensor reference values as well as on the accuracy of wind estimations which are necessary in the absence of measured wind. The quality of the correction coefficients derived using this estimated wind is evaluated by comparing the differ- ence in wind estimation from three different objective functions and two dierent optimization routines. Additionally, position error correction (PEC) tower flyby maneuvers with accurate wind measurements close to the helicopter ight path are used to verify the results obtained via the SCADS windbox technique.