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
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.
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 apstract has been rewritten with the help of AI based on the project's original abstract]
Keywords
ventil ; sliding mode ; ON/OFF