Transient pneumatic system simulation

  • Transiente Simulation pneumatischer Systeme

Kratschun, Filipp; Murrenhoff, Hubertus (Thesis advisor); Schmitz, Katharina (Thesis advisor)

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

In: Reihe Fluidtechnik. D 99
Page(s)/Article-Nr.: VIII, 118, IX-XIX Seiten : Illustrationen, Diagramme

Dissertation, RWTH Aachen University, 2020

Abstract

In the age of digitization simulation models play a central role. For the time-efficient design or condition monitoring of complex systems, precise numerical calculation models are required because such systems cannot be calculated analytically. This applies in particular to highly dynamic systems using compressible gas as operating medium, since the underlying mathematical description is based on equations of gas dynamics. Examples can be found in process engineering, pneumatics and combustion engineering. The aim of this thesis is the development of a transient simulation library for the time-efficient calculation of gas-powered networks consisting of the following components: pipe, pipe connector, valve, pipe with discontinuous cross-sectional extension, reservoir, L-connector, T-connector and cylinder. The components are locally resolved in at least one dimension. For components where this is not possible due to complex physical behavior, the local discretization is carried out in two dimensions. The calculation core of each component is based on an explicit first order finite volume method. The validation of the components is carried out in two steps: analytically applying closed solution cases and experimentally on a test bench. The analytical validation serves as proof that the components provide physically correct results. Experimental validation is used to demonstrate the accuracy of individual components and systems consisting of several components. The developed component library achieves an accuracy of more than 95 % com-pared to the experiment. The computing time per meter system’s length is fifteen times the simulation time. However, this can be reduced considerably in future work. This would make it possible to realize real-time capable condition monitoring of complex gas-powered systems.

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