Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"O-rings"”.
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Modeling of the Damping Contributions of O-rings in a Submergible Six-Axis Load Cell.
… beam configurations sealed with compressible o-rings. This objective is achieved by adding a damping contribution to the existing stiffness model through an appropriate time derivative function. Data collection parameters are experimentally determined to control the noise and prevent the time …
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The effect of different chemical classes on the swelling of NBR O-rings in blends with synthetic paraffinic kerosene
… samples that are more representative of O-rings in service. Experiments were conducted on both new and conditioned (deplasticised) NBR O-ring samples. Materials tested in this investigation included petroleum-derived Jet A-1, Fischer Tropsch-derived synthetic paraffinic kerosene (SPK) and …
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Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage
… detection and repair programs. Elastomeric O-rings can be used as valve stem seals, and O-ring manufacturers recommend lubrication of elastomeric seals to prevent damage and to assure proper sealing. In this research, a metallic coating was applied as a lubricant using a vacuum vapor …
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Effects of O-Ring Elastomers with Conventional and Synthesized Aviation Fuels with a Novel Elastomer Dynamic Compression System
… investigate the reactions of common aviation O-rings with the leading candidates for conventional aviation fuel replacement. The experimental methodology employed a novel elastomer/fuel compatibility test apparatus, designed and built specifically for this research, that replicates O-ring …
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Experimental Analysis of Empirical Model for Friction and Wear in Rubber on Dry Concrete
… in various products such as shoe soles, tires, O-rings, wiper blades, gaskets, artificial joints, and so on. This work analyzes the common and widely used models for friction and wear with the help of experimental data, analyzes the limitation, and helps to improve them. Although friction in …
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A novel method to evaluate synthetic fuel options for gas turbines in terms of O-ring swelling
… in the tendency of the fuel to swell nitrile O-rings. This is of particular concern as the transition of synthetic fuels to conventional fuels can result in fuel leakage and elastomer shrinkage in fuel distribution systems.
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The effect of hydrocarbon exposure and temperature on the behaviour of elastomeric seals
… number of ring structures (particular aromatic rings) as well as increasing all Hansen solubility parameters increased swelling. Of the Hansen solubility parameters, the greatest correlation was found with the hydrogen-bonding (electron exchange) parameter. Nonetheless the dispersion parameter …
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Exploring the mechanisms critical to the operation of metal face seals through modeling and experiments
… identical rotating and stationary seal rings, and a loading mechanism using elastomeric O-rings. Two versions of the numerical models have been developed to evaluate seal performance under various operating conditions. Both models consider interactions among surface deformations due to …
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A calibrated dual-port acoustic Vector Network Analyser
… This flange system has alignment pins and O-rings to ensure proper sealing and repeatability. Several materials were used with additive manufacturing techniques to create couplers and waveguide sections, each with its own advantages. Titanium (Ti64) offered the best usability and reliability, …
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Heat resistance of Salmonella typhimurium and Listeria monocytogenes in suspension and in a biofilm matrix
… menstrum. Biofilms were grown on Buna-n rubber o-rings (4.46 mm O.D. x 1.41 mm]. D.) for 36 hours. All other cultures used were in stationary phase of growth. The three treatments tested were: inoculated milk, sterile milk and a biofilm on an o-ring, and inoculated milk with a sterile o-ring. At …
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Combined effects of bioavailable organic contaminants in the aquatic environment.
… substances, the study identified the use of SR O-rings as a suitable passive dosing format in toxicity tests in vitro, and was partially validated through their use in dosing RTL-W1 cells with two individual PAHs, which subsequently determined both cytotoxicity and EROD-activity.