<p>When considering fluid power digital displacement machines, one of the key elements are the fast switching valves. However, conflicting design objectives and requirements for dynamic performance means that designing these fast switching valves is a complex process, which pushes the technology to the limits. Optimization approaches are therefore required to both find feasible and optimal solutions. However, to described the fluid dynamic effects dynamic CFD simulation is required to accurately capture e.g. fluid stiction, -drag and -end damping effects. This limits the possibilities to use numerical optimisation approaches, not only due to the computational burden imposed, but also due to the requirement for dynamic mesh generation and parametrization of the design. The focus of this paper is therefore to investigate analytical lumped parameter approximations and the size of the error introduced by simplifying dynamic fluid friction effects into a lumped parameter form.</p><p>Specifically, the article presents presents a comprehensive parameter study of selected design parameters' &nbsp;influence on the fluid forces in fast switching annulus valves, based on both analytical expressions and results derived from dynamic CFD-simulations. Focus is especially on describing the effects and size of these as a result of changes in parametric design parameters, which influence the flow geometry. The results of the study reveal that there is a fair correlation between the fluid force predicted by the rapidly executable lumped model and the CFD model.</p>

Investigating the Influence of Design Parameters on the Fluid-Structure Interaction in Fast Switching Valves

Paper Proceedings: https://asmedigitalcollection.asme.org/FPST/FPMC2021/volume/85239

2021 ASME/BATH Symposium on Fluid Power and Motion Control (FPMC2021)

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