The availability of accurate equipment models plays a key role in the project of fly-by-wire flight control systems, since crucial activities as closed-loop controls’ design, performance analysis, integration studies, and the development of monitoring algorithms can be strongly enhanced if a high-fidelity simulation is used. This paper deals with the development and the validation of the model of a hydraulic actuator for fly-by-wire helicopter controls. The model provides a detailed simulation of the main actuator parts, and is capable to simulate the system dynamics with electrical and hydraulic failures. Simulation results are validated via experiments, by performing an extensive test campaign in terms of frequency and time responses. The validation, obtained in both normal and fail-operative conditions at servovalve as well as actuator level, allowed to highlight the importance of some model details for simulating relevant system nonlinearities, such as the actuator limit cycle oscillations.

Simulation and Experiments for the Study of a Fault-Tolerant Hydraulic Actuator for Fly-By-Wire Helicopters

DI RITO, GIANPIETRO;GALATOLO, ROBERTO
2011

Abstract

The availability of accurate equipment models plays a key role in the project of fly-by-wire flight control systems, since crucial activities as closed-loop controls’ design, performance analysis, integration studies, and the development of monitoring algorithms can be strongly enhanced if a high-fidelity simulation is used. This paper deals with the development and the validation of the model of a hydraulic actuator for fly-by-wire helicopter controls. The model provides a detailed simulation of the main actuator parts, and is capable to simulate the system dynamics with electrical and hydraulic failures. Simulation results are validated via experiments, by performing an extensive test campaign in terms of frequency and time responses. The validation, obtained in both normal and fail-operative conditions at servovalve as well as actuator level, allowed to highlight the importance of some model details for simulating relevant system nonlinearities, such as the actuator limit cycle oscillations.
9788896427187
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/197500
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact