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Abstract
Digital Displacement (DD) fluid power machines utilizes electronically controlled seat valves connected to pressure chambers to obtain variable displacement with high operational efficiency and high bandwidth. To achieve high efficiency, fast valve switching is essential and all aspects related to the dynamic behaviour of the seat valves must be considered to optimize the machine efficiency. A significant effect influencing the valves switching performance is the presence of oil stiction when separating the contact surfaces in valve opening movement. This oil stiction force is limited by cavitation for low pressure levels, e.g. valves connected to the low pressure manifold, however for valves operated at higher pressure levels, the oil stiction force is dominating when the separating surfaces are close to contact.
This paper presents an analytic solution to the oil stiction force for annular seat valves suitable for DD applications based on the Reynolds equation and considers contact surface curvature and attack angle. A dynamic cavitation zone is included in the stiction model, and cavitation is found to be present even for seat valves surrounded by high pressure levels.
This paper presents an analytic solution to the oil stiction force for annular seat valves suitable for DD applications based on the Reynolds equation and considers contact surface curvature and attack angle. A dynamic cavitation zone is included in the stiction model, and cavitation is found to be present even for seat valves surrounded by high pressure levels.
Original language | English |
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Title of host publication | Proceedings of the 12th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2014 |
Number of pages | 9 |
Publisher | American Society of Mechanical Engineers |
Publication date | Jun 2014 |
DOIs | |
Publication status | Published - Jun 2014 |
Event | ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis - Tivoli Hotel, Copenhagen, Denmark Duration: 25 Jun 2014 → 27 Jun 2014 http://www.asmeconferences.org/ESDA2014/ |
Conference
Conference | ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis |
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Location | Tivoli Hotel |
Country/Territory | Denmark |
City | Copenhagen |
Period | 25/06/2014 → 27/06/2014 |
Internet address |
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Dive into the research topics of 'Oil Stiction in Fast Switching Annular Seat Valves for Digital Displacement Fluid Power Machines'. Together they form a unique fingerprint.Projects
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HyDrive: Hydrostatic Drive Train Transmission for Renewable Energy Applications
Andersen, T. O., Bech, M. M., Nørgård, C., Roemer, D. B. & Johansen, P.
DSF The Danish Council for Strategic Research
01/04/2014 → 30/09/2019
Project: Research