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1.
Ionic hydraulic fluids and seal-material compatibility
Darko Lovrec, Roland Kalb, Vito Tič, 2024, original scientific article

Abstract: Manufacturers of hydraulic fluids invest a lot of effort and resources in improving their physico-chemical properties, with the goal of getting as close as possible to the properties of an ideal hydraulic fluid. It should be non- flammable, environmentally friendly, sustainable and should have excellent physical and chemical properties. After decades of development in the field of ionic liquids and the search for an ionic liquid suitable for use in hydraulic systems, ionic hydraulic liquids are now already in industrial use, especially on devices that operate in harsh and risky operating conditions. Since ionic hydraulic fluids are a completely new type of hydraulic fluid, one of the issues is their compatibility with the materials present in the hydraulic components, including all the seals. This paper refers to the process of testing the compatibility of hydraulic seal materials with different types of ionic hydraulic fluids according to the standardized percentages and recommendations, with emphasis on changes in the swell, shrinkage and hardness of the seals. The presented results are a useful guide for selecting suitable seal materials in case of using high-tech ionic hydraulic fluids.
Keywords: ionic hydraulic fluids, seal material, compatibility, fluid-testing method, test results
Published in DKUM: 19.03.2024; Views: 215; Downloads: 8
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2.
Manipulability of a haptic mechanism within the cylindrical space of an MR scanner
Matej Rajh, Srečko Glodež, Jože Flašker, Karl Gotlih, 2012, original scientific article

Abstract: The aim of this paper is to present developed 3 DOF haptic mechanism and 3D visualization method for analysis of mechanism manipulability problems within limited space. Improvement in mechanism manipulability within cylindrical space is crucial for devices, which operate in MR tunnel. This solution enables the plotting of quantitative 3D representation for each point in the mechanism's workspace, using selected resolution which can be determined in advance. The cross-section between the limited space and the whole arbitrary workspace shows the ability for movement execution.
Keywords: gibljivost, Jacobijeva matrika, delovni prostor, haptični mehanizem, MR-združljivost, omejen prostor, manipulability, Jacobian matrix, workspace, haptic mechanism, MR compatibility, limited workspace
Published in DKUM: 10.07.2015; Views: 1354; Downloads: 95
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