Physikalisch motivierte, transiente Modellierung translatorischer Hydraulikdichtungen

  • Physically motivated, transient modelling of translatory hydraulic seals

Angerhausen, Julian Benedikt; Murrenhoff, Hubertus (Thesis advisor); Schmitz, Katharina (Thesis advisor)

Düren : Shaker Verlag (2020)
Book, Dissertation / PhD Thesis

In: Reihe Fluidtechnik. D 102
Page(s)/Article-Nr.: 1 Online-Ressource (vii, 139, A2 Seiten) : Illustrationen, Diagramme

Dissertation, RWTH Aachen University, 2020

Abstract

Seals are crucial machine elements in hydraulic devices. A failure of the seal can lead to expensive production downtimes or even environmentally hazardous leak-age. Especially with regard to dynamic seals - for example in cylinder applications - the physical understanding of the sealing mechanism is still insufficient. Within the scope of this thesis, a physically motivated and experimentally validated transient model of the tribological contact of translatory hydraulic seals is developed. The model describes the physical dimensions in the sealing gap, such as gap height, contact and fluid pressure, the resulting friction force and the wear of the sealing material during operation. Such a model serves the deeper understand-ing of the sealing mechanism and can reveal future optimization potentials. First, tests are carried out on a specially developed seal tribometer. These experiments serve for a detailed and precisely defined examination of the sealing contact. The focus is on the quantification of different influences on the stationary and the transient frictional force as well as on the determination of the resulting seal wear. Subsequently an elastohydrodynamic simulation of the seal is built and conducted. The macroscopic deformation and its influence on the microscopic sealing gap are taken into account. For this purpose, subroutines are implemented in the finite element program ABAQUS for the solid contact, based on the physical based approach of Persson, the fluid contact, based on the Reynolds equation, as well as the wear of the seal, described by the model of Archard. The following detailed comparison between model and experimental results shows a good correlation for a wide range of results. Finally, the validated model is used to simulate the transient behavior of a hydraulic rod seal and to discuss the influence of transient effects in detail.

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