Robust Incremental Nonlinear Dynamic Inversion Control Using Angular Accelerometer Feedback

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Abstract

Incremental Nonlinear Dynamic Inversion (INDI) is a robust nonlinear control tech­nique that is an adaptation of nonlinear dynamic inversion (NDI). By assuming time scale separation between fast and slow dynamics, and by using angular acceleration feedback, the inner loop of INDI directly controls angular accelerations with incremental control effector inputs. In practice, most applications rely on derivation and filtering of angular rates to obtain angular accelerations. The added steps in the feedback loop introduce transport delays and thereby reduce the tracking performance of the controller. Recent technolog­ical advancements in angular accelerometer design have made it feasible to use angular accelerometers for direct sensing of the accelerations. Simulations are done using a CS-25 type aircraft model in combination with real-world sensor characteristics and turbulence. The main contribution of this paper is the effects of using angular accelerometers in INDI control. Controller performance in the investigated configuration of angular accelerome­ ters, rate gyros and effector deflection sensors is limited by the high transport delays of the gyros. Using the angular accelerometer signals to obtain the rates, controller tracking performance is improved whilst requiring lower actuator effort. Further contributions are a study on angular accelerometer misalignment showing that INDI control rejects sensor misalignment successfully, and finally a study on the effects of using uncalibrated control effector deflection feedback showing the high sensitivity of INDI control to uncalibrated effector sensors.
Original languageEnglish
Title of host publicationProceedings of the 2018 AIAA Information Systems-AIAA Infotech @ Aerospace
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages16
ISBN (Electronic)978-1-62410-527-2
DOIs
Publication statusPublished - 2018
EventAIAA Information Systems-AIAA Infotech at Aerospace, 2018 - Kissimmee, United States
Duration: 8 Jan 201812 Jan 2018
https://doi.org/10.2514/MIAA18

Conference

ConferenceAIAA Information Systems-AIAA Infotech at Aerospace, 2018
CountryUnited States
CityKissimmee
Period8/01/1812/01/18
Internet address

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