1. Suitability of test procedures for determining the compatibility of seal materials with ionic hydraulic fluidsDarko Lovrec, Vito Tič, 2024, izvirni znanstveni članek Opis: The compatibility of seal materials with the working fluid is crucial for the flawless, energysaving, environmentally sustainable, and safe operation of any technical system. This is especially
true for hydraulic systems operating under high operating pressure. The problem of materials
compatibility comes into play when either a new type of seal material or a new type of fluid comes
into use. The paper discusses the research findings regarding material compatibility testing of new
high-tech ionic hydraulic fluids with commonly used seal materials. Due to the completely different
chemical composition of these new fluids compared to the classical mineral-based oil, for these fluids,
there are no standardized testing procedures. In these cases, we can only lean on the Standards
that apply to classical fluids, which can lead to incorrect results. In the forefront of the paper is the
discrepancy between the results obtained by the standardized test, and the test under real operating
conditions. FKM, an excellent material for seals, proved to be the most suitable in the case of using
ionic hydraulic fluid, according to a standardized test. However, it failed in the comparison test
under real operating conditions, as the cylinder leaked. NBR seals proved to be a better solution.
Ključne besede: ionic hydraulic fluids, seal material compatibility, static and dynamic test, comparison of results, differences, test suitability
Objavljeno v DKUM: 10.09.2024; Ogledov: 59; Prenosov: 35
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2. Ionic hydraulic fluids and seal-material compatibilityDarko Lovrec, Roland Kalb, Vito Tič, 2024, izvirni znanstveni članek Opis: 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.
Ključne besede: ionic hydraulic fluids, seal material, compatibility, fluid-testing method, test results
Objavljeno v DKUM: 19.03.2024; Ogledov: 287; Prenosov: 26
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3. Manipulability of a haptic mechanism within the cylindrical space of an MR scannerMatej Rajh, Srečko Glodež, Jože Flašker, Karl Gotlih, 2012, izvirni znanstveni članek Opis: 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.
Ključne besede: gibljivost, Jacobijeva matrika, delovni prostor, haptični mehanizem, MR-združljivost, omejen prostor, manipulability, Jacobian matrix, workspace, haptic mechanism, MR compatibility, limited workspace
Objavljeno v DKUM: 10.07.2015; Ogledov: 1410; Prenosov: 98
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4. Huber, Katharina T.(S-UPPS-BIF); Moulton, Vincent(S-UPPS-BIF); Semple, Charles(NZ-CANT-BR): Replacing cliques by stars in quasi-median graphs. (English summary). - Discrete Appl. Math. 143 (2004), no. 1-3, 194--203.Sandi Klavžar, 2005, recenzija, prikaz knjige, kritika Ključne besede: matematika, teorija grafov, kompaktibilnost, Bunemanov graf, kvazimedianski graf, mathematics, graph theory, split, (in)compatibility, strong compatibility, Buneman graph, multi-split graph, quasi-median graph
Objavljeno v DKUM: 10.07.2015; Ogledov: 1006; Prenosov: 39
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