Transient Force Reduction in Electromechanical Actuators for Thrust-Vector Control

摘要: There is a move within the aerospace community to use electromechanical actuators (EMA) in thrust-vector control (TVC) applications. However, shock-wave forces that occur during startup and shutdown of unthrottled TVC rocket engines excite resonance mechanical dynamics. This results very large transmitted through actuator. Additionally, with traditional compensation, position system must be designed lowbandwidth because typically low resonant frequency. Dynamicforce feedback (DFF)compensation proposed reduce effects resonance. Utilizing motor sensor load cell actuator mount,aproportional-integral-derivative (PID)positioncontrolloopisclosedinparallelwithaforcecontrolloopto provideresonancereductionand forcereduction.Thisallowshigherpositioncontrolbandwidthswhile reducingthetransmittedforces.Thecontrollerdesignmethodologyusestwoindependentloop-shapingprocedures, which are separated by their effective frequency ranges. The techniques validated experimental data from an EMA-TVC simulator, showing improvements both forces. controller shown robust respect variation