07 Fakultät Konstruktions-, Produktions- und Fahrzeugtechnik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/8
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Item Open Access Elastohydrodynamic simulation of pneumatic sealing friction considering 3D surface topography(2022) Bauer, Niklas; Baumann, Matthias; Feldmeth, Simon; Bauer, Frank; Schmitz, KatharinaThis contribution presents an elastohydrodynamic lubrication (EHL) model for pneumatic spool valves. For an accurate estimation of the transient friction of this tribological sealing system, the surface topography of the cylindrical sealing counterfaces of the valve housings are measured and analyzed with an optical surface measurement instrument. Based on the surface topography data, tribological properties and flow factors of the system are derived. It has been found that the consideration of the surface topography has a significant influence on the simulation results of the EHL model, lowering the calculated friction force by up to 20 %.Item Open Access Assessment of the Lubricity of Grease‐Sealing Rotary Shaft Seals Based on Grease Properties(2022) Hahn, Susanne; Feldmeth, Simon; Bauer, FrankGrease‐lubricated sealing systems have an increased risk of starved lubrication. For this work, the lubricity of 23 greases in a rotary shaft sealing system was evaluated with a new test and evaluation method. The lubricity was then correlated with rheological and other grease properties. These grease properties are either available by the data sheet or can be measured with low effort. The results of the correlation allow a preselection of greases which are expected to lubricate rotary shaft seals well. This can support manufacturers and users in considering the lubrication of the sealing system early in the development process.Item Open Access Multiphase conjugate heat transfer analyses on the assembly situation of rotary shaft seals(2023) Hannss, Jacqueline; Grün, Jeremias; Olbrich, Christoph; Feldmeth, Simon; Bauer, FrankRotary shaft seals prevent the exchange of fluid at shaft passages. Their function and service life depend decisively on the temperature in the contact area between the sealing edge and the shaft. Since the temperature depends on both the generation of frictional heat in the contact area and the heat transfer to the surrounding sealing system, the design of the sealing system is crucial. Within the scope of this work, multiphase conjugate heat-transfer analyses were performed considering different assembly situations. The computed results were presented and contrasted to experimental data. This resulted in a valid model for predicting the temperature in the sealing system, which provided insight into the influence of the sealing surroundings on the contact temperature.Item Open Access Estimating the contact temperature and the pumping rate of rotary shaft seals : new possibilities with a web application(2023) Feldmeth, Simon; Bekgulyan, Sumbat; Bauer, Frank