Linear Parameter Varying Control of Modified Vega Launch Vehicle
Translated title
Lineær Parameter Varierende Kontrol af Modificeret Vega Raket
Author
Rasmussen, Frederik Skyt Dæncker
Term
4. term
Education
Publication year
2021
Abstract
Dette speciale udvikler en Linear Parameter-Varying (LPV) holdningsregulator til en modificeret Vega-løfteraket med fokus på gravity turn-delen af banen. Udgangspunktet er en kontekstuel analyse af opsendelse, flyvning og landing af løfteraketter, hvorfra krav til stabilitet, sporing, støj og forstyrrelsesundertrykkelse fastlægges. En tilstandsrum-model af den stive raket etableres ved hjælp af dynamiske ligninger og relevante rammetransformationer, og en todimensionel pitch-planmodel udvides med strukturelle bøjningsmåder, tidsforsinkelse, vind, støj og aktuatordynamik. Modellen augmenteres med vægte baseret på de specificerede krav og bruges til syntese af en grid-baseret LPV-controller. LPV-simuleringer viser, at den designede regulator opfylder de opstillede ydeevnekrav i gravity turn-fasen.
This thesis develops a Linear Parameter-Varying (LPV) attitude controller for a modified Vega launch vehicle, focusing on the gravity turn phase of the trajectory. It begins with a contextual analysis of launch, flight, and landing to define performance requirements for stability, tracking, noise, and disturbance rejection. A rigid-body state-space model is built using dynamic equations and frame transformations, and a two-dimensional pitch-plane model is extended with structural bending modes, time delay, wind, noise, and actuator dynamics. The model is augmented with weights derived from the specified requirements and used to synthesize a grid-based LPV controller. LPV simulations verify that the controller meets the defined performance targets during the gravity turn.
[This summary has been generated with the help of AI directly from the project (PDF)]
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