Universität Stuttgart
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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 Modeling the pumping behavior of macroscopic lead structures on shaft counterfaces of rotary shaft seals(2023) Engelfried, Maximilian; Haffner, Georg; Baumann, Matthias; Bauer, FrankThe leak tightness of the sealing system rotary shaft seal is based on the formation of an active back-pumping effect of the sealing ring. Here, the sealing ring pumps the fluid in the sealing gap back into the housing. However, this active sealing mechanism is disturbed by so-called “lead structures”. Lead structures include all types of directional structures on the sealing counterface which create rotation-dependent axial fluid pumping. Lead-affected sealing counterfaces can thus cause leakage or insufficient lubrication of the sealing contact. To ensure leak tightness, lead must be avoided or tolerated. This article investigates how different structural characteristics of lead affect the amount of fluid pumped by the shaft surface. For this purpose, 26 shafts are subjected to surface analyzing methods and an experimental pumping rate test. The interaction of various geometric features of the lead structures and their combined effect on the pumping capacity is modeled based on the measured data. Appropriated correlation models are discussed and relationships between shaft lead and its pumping effect are shown. The aim is to estimate shaft pumping rates based on surface measurements in future. The results contribute to the derivation of measurable tolerance values for lead and to the prevention of leakage.Item Open Access Moderne visuelle Untersuchungsmethoden für die Verschleißanalyse am Beispiel Radial-Wellendichtring(2018) Baumann, Matthias; Bauer, FrankItem Open Access Abdichtung drallbehafteter Dichtungsgegenlaufflächen - Messung, Analyse, Bewertung und Grenzen(Stuttgart : Institut für Maschinenelemente, 2017) Baumann, Matthias; Haas, Werner (Prof. Dr.-Ing. habil.)Item Open Access Messung, Analyse und Bewertung von Dichtungsgegenlaufflächen für das Tribo-System Radial-Wellendichtung(2014) Baumann, Matthias; Bauer, Frank; Haas, WernerItem Open Access Empirische Modellierung der Drall-induzierten Fluidförderwirkung von Dichtungsgegenlaufflächen - Sind Grenzwerte möglich?(2016) Baumann, Matthias; Bauer, Frank; Haas, WernerItem Open Access How wetting properties influence the wear of radial lip sealing systems(2022) Fricker, Philipp; Baumann, Matthias; Bauer, FrankIncreased wear on radial lip seal systems is observed when sealing modern lubricants, such as polyglycols and esters. This can impair the function of the sealing system and ultimately lead to leakage. This work, carried out within the AiF research project “Welleneinlauf” (wear of counter faces) [1], shows methods to identify and predict excessive wear of radial lip sealing systems based on their wetting properties and pumping rate. The knowledge gained will support users by providing faster and more cost‐effective testing methods early in the design process, thus enables a significant increase in the service life of radial lip sealing systems.Item Open Access Radial-Wellendichtungen analysieren und beurteilen(2012) Baumann, Matthias; Haas, WernerItem Open Access Improving a gear box sealing system - individual test design based on given application parameters and failure analysis(2021) Merkle, Lukas; Baumann, Matthias; Bauer, FrankItem Open Access Förderwirkung von Fehlstellen im Dichtsystem Radial-Wellendichtung(2018) Totz, Jan; Baumann, Matthias; Bauer, Frank