Slosh Observer Design for Aeroelastic Launch Vehicles

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This paper focusses on the design of a sliding-mode observer to estimate the states of the slosh-mass position and velocity. These states are subsequently used as feedback signals for the attitude controller. A simple proportional-derivative (PD) rigid-body controller cannot safely execute attitude commands without encountering stability problems, and even in a steady state situation a non-zero slosh-mass positions leads to jittering in the swivel angle. With slosh-state feedback, even a non-optimal PD controller exhibits a smooth response with limited actuator activity. However, a slight uncertainty in the slosh-model parameters of the observer will negatively affect the controller performance, and, as a consequence, increase the amplitude and oscillatory behaviour of the liquids. An additional observer will be required to estimate the correct parameter values. A more robust incremental non-linear dynamic inversion controller improves the controller response, but further development will be required, for instance, by including notch filters in the feedback loops.

Original languageEnglish
Title of host publicationAIAA Scitech 2020 Forum
Subtitle of host publication6-10 January 2020, Orlando, FL
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages23
ISBN (Electronic)978-1-62410-595-1
Publication statusPublished - 2020
EventAIAA Scitech 2020 Forum - Orlando, United States
Duration: 6 Jan 202010 Jan 2020

Publication series

NameAIAA Scitech 2020 Forum
Volume1 PartF


ConferenceAIAA Scitech 2020 Forum
CountryUnited States


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