Full-Bridge Oscillation Transformer Control: Control and Modelling of Fluid Power Full-Bridge Oscillation Transformer
Translated title
Full-Bridge Oscillation Transformer Control
Author
Andersen, Kristen Emil Bording
Term
4. term
Education
Publication year
2023
Submitted on
2023-06-01
Pages
52
Abstract
Dette speciale undersøger styring af en Full-Bridge Oscillation Transformer (FBoT), en hydraulisk tryk-/flowtransformer baseret på en oscillerende stempelenhed med fire kamre og styrede on/off-ventiler. Formålet er at udvikle en styringsmetode, der koordinerer ventilskift og kammertryk, så transformerens cyklusser (input, output og bremsning) gennemføres stabilt og effektivt under realistiske hydraulikforhold. Arbejdet opstiller en detaljeret, fysikbaseret model af forsyningssystemet (pumpe og akkumulator), væskeegenskaber (effektivt bulkmodul og trykafhængig viskositet), kontraventiler og on/off-ventiler med dynamik og forsinkelse, kammertryk, stempelkræfter og friktion, interne lækager samt en lastmodel. Denne model bruges i en Model Predictive Control (MPC)-ramme, hvor ventilernes skiftetidspunkter parametriseres og optimeres med hensyn til begrænsninger på bremsningstiming og stempelposition samt en omkostningsfunktion, der relaterer input- og output-arbejde og virkningsgrad. Kontrolstrategien tager højde for ventilforsinkelse og sampling og anvender designvariable knyttet til centrale skiftetider for at styre energioverførsel og position. Modellen valideres ifølge indholdsfortegnelsen; kvantitative resultater er dog ikke inkluderet i det tilgængelige uddrag.
This thesis addresses control of a Full-Bridge Oscillation Transformer (FBoT), a hydraulic pressure/flow transformer built around an oscillating piston with four chambers and on/off valve actuation. The objective is to develop a control method that coordinates valve switching and chamber pressures so the transformer’s cycles (input, output, and braking) are executed stably and efficiently under realistic hydraulic dynamics. The work formulates a detailed physics-based model of the supply system (pump and accumulator), fluid properties (effective bulk modulus and pressure-dependent viscosity), check and on/off valves with dynamics and delays, chamber pressures, piston forces and friction, internal leakage, and a load model. This model is embedded in a Model Predictive Control (MPC) framework in which valve switching times are parameterized and optimized subject to braking-timing and piston-position constraints, with a cost function tied to input/output work and efficiency. The control strategy accounts for valve delay and sampling and uses design variables associated with key switching times to govern energy transfer and motion. Model validation is outlined in the thesis; quantitative performance results are not included in the provided excerpt.
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