Feasibility Study of a Novel ON/OFF Valve Solution for Velocity Servo Systems
Translated title
Teoretisk undersøgelse af en ny ON/OFF ventil løsning til hastigheds servosystemer
Author
Brorsen, Anette
Term
4. term
Education
Publication year
2014
Submitted on
2014-06-03
Pages
83
Abstract
Denne rapport undersøger, om simple ON/OFF-ventiler kan erstatte en traditionel proportionalventil til hastighedsstyring i et hydraulisk servosystem (et bevægelsesstyringssystem drevet af tryksat væske). To opstillinger modelleres: én med fire ON/OFF-ventiler og én med en enkelt proportionalventil, alle med kommercielt tilgængelige komponenter. Tre hovedudfordringer identificeres: at udvikle en multivariat skiftestrategi; at håndtere fluid hammer, som giver trykstød hver gang en ventil åbner eller lukker; og at forholde sig til hver ventils begrænsede skiftetid, som sætter en grænse for skiftefrekvensen. Resultaterne viser, at standardventilerne er for langsomme og bør udskiftes med hurtigere ventiler. En sliding-mode regulator (en robust styringsmetode) designes til hvert system. Med denne styring og hurtigere ventiler opnås bedre ydeevne end med den traditionelle proportionalventil.
This report examines whether simple on/off valves can replace a conventional proportional valve for speed control in a hydraulic servo system (a motion control system powered by pressurized fluid). Two setups are modeled: one using four on/off valves and one using a single proportional valve, all with commercially available components. Three key challenges are identified: designing a multivariable switching strategy; managing the fluid hammer effect, which creates pressure spikes when a valve opens or closes; and dealing with each valve’s finite switching time, which limits how fast the system can switch. The results show that the off-the-shelf valves are too slow and should be replaced with faster ones. A sliding-mode controller (a robust control method) is designed for each system. With this control approach and faster valves, performance is shown to be better than with the traditional proportional valve.
[This abstract was generated with the help of AI]
Keywords
ventil ; sliding mode ; ON/OFF
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