Gå til hovedinnhold
0
Jump to main content

Synthetic Esters in Hydraulic Valves

Jannik Hartwig Jakobsen of the Faculty of Engineering and Science has submitted his thesis «Synthetic Esters in Hydraulic Valves», and will defend the thesis for the PhD-degree Wednesday 27 May 2020. (Photo: Private)

One way of reducing the pollution caused by hydraulic oil lost in nature is to replace the standard mineral oil with an Environmentally Acceptable Liquid - EAL.

Jannik Hartwig Jakobsen

PhD Candidate and Project manager

Jannik Hartwig Jakobsen of the Faculty of Engineering and Science has submitted his thesis «Synthetic Esters in Hydraulic Valves», and will defend the thesis for the PhD-degree Wednesday 27 May 2020.

He has followed the PhD-programme at the Faculty of Engineering and Science with Spesialisation in Mechatronics. The PhD-research is partly fundeed by Cameron – Schlumberger.

Summary of the Thesis by Jannik Jakobsen:

Synthetic Esters in Hydraulic Valves

Each year 35-37 million tons of lubrication is consumed.

Hydraulic oils constitute 10.2% of the total lubrication consumption, and a large part of that is lost to leakage, hose burst and accidents.

Can EALs replace mineral oil

One way of reducing the pollution caused by hydraulic oil lost in nature is to replace the standard mineral oil with an Environmentally Acceptable Liquid - EAL.

EALs are already being used but to an extent, that is somewhat sector dependant, and

reluctance amongst system designers is one of the factors limiting the usage.

Effects of using Synthetic Ester oils

The thesis maps the current knowledge on Environmetally Acceptable Liquids (EALs) and more specifically studies the effects of using Synthetic Ester oils (HEES) on hydraulic valve behavior.

Two of the most commonly used valves in hydraulics are selected for studies:

  • The pressure compensated directional control valve, PCPDCV
  • The counterbalance valve, CBV.

The studies are heavily based on experiments and use lump-parameter models computational fluid dynamics to characterize the observed behavior.

Standard mineral oil with improved viscosity/temperature properties, HV, was used for reference, and compared to a partially saturated synthetic ester and a fully saturated synthetic ester.

Experiments were run at 20°C-60°C resulting in a benchmark targeting actual system design, where temperature, in general, cannot be assumed constant.

 

Opponent ex auditorio:

The chair invites members of the public to pose questions ex auditorio in the introduction to the public defense, with deadlines. Questions can be submitted to the chair Geir Grasmo at e-mail geir.grasmo@uia.no.

The thesis is available here:

https://uia.brage.unit.no/uia-xmlui/handle/11250/2655838

Disputation facts:

The Candidate: Jannik Hartwig Jakobsen (1985, Randers, Denmark) BA og MA from Aalborg University. Now working as a Project manager at J.H. Stålindustri, Spentrup in Randers municipality, Denmark.

The trial lecture and the public defence will take place at internet, via the Zoom conferencing app (link below) Wednesday 20 May 2020.

Professor Geir Grasmo, Department of Engineering Sciences, UiA, will chair the disputation.

Trial lecture at 10:15 a.m.

Public defense at 12:15 p.m.

Given topic for trial lecture"Physical-hydraulic properties of fluids and their implications on the proper functioning of fluid power drives"

Thesis title: «Synthetic Esters in Hydraulic Valves»

Search for the thesis in AURA - Agder University Research Archive, a digital archive of scientific papers, theses and dissertations from the academic staff and students at the University of Agder.

Opponents:

First opponent: Professor Rudolf Scheidl, Institute of Machine Design and Hydraulic Drives, Johannes Kepler University, Austria

Second opponent: Professor Heikki Handroos, Department of Mechanical Engineering, Lappeenranta University of Technology, Finland

Professor Sathyajith Mathew, Department of Engineering Sciences, University of Agder, is appointed as the administrator for the assessment commitee.

Supervisors were Professor Michael Rygaard Hansen (main supervisor) and Professor Henrik Kofoed Nielsen (co-supervisor)