Model validation and analysis using feedforward control flight test data
Model validation and analysis using feedforward control flight test data
- Neue Suche nach: Wartmann, Johannes
- Neue Suche nach: Wartmann, Johannes
Abstract The German Aerospace Center (DLR) operates the ACT/FHS research helicopter with a full model-based control system applicable from hover to 120 knots forward flight, including take-off and landing. The feedforward controller used in this system is based on linear model inversion of identified local models. Therefore, the overall performance of the feedforward controller is highly dependent on the accuracy of the used inverted models. While several approaches exist to analyze model accuracy in time and frequency domains, a validation method for inverse models is rarely considered in the literature. In this paper, a flight test campaign that has been conducted to analyze model validity of the feedforward controller is presented and evaluated. A new model validation method using the feedforward controller to follow a reference command is discussed. Measured deviations from the commanded references are evaluated in the time domain to highlight the model subsystems that are not precisely represented by the linear models. The obtained results are compared with a validation method from system identification. Model extensions are proposed to increase the model accuracy for feedforward controller usage.
Dokumentinformationen
Model validation and analysis using feedforward control flight test data
CEAS Aeronautical Journal ; 6 , 3
2015
Aufsatz (Zeitschrift)
Englisch
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