Abstract: Regarding constrained mechanical systems, we are faced with index3 differentialalgebraic equation (DAE) systems. Direct discretization of the index3 DAE systems only enforces the position constraints to be fulfilled at the ...

Abstract: Air foil bearings are used in turbomachinery applications with high speeds and in oil-free environments. Their numerical analysis has to account for the multiphysicality of the problem. This work features a detailed ...

Abstract: Abstract. This article explores the performance of foil thrust bearings under misalignment conditions, highlighting the need for a fully coupled simulation model to capture their thermo-mechanical behavior. The in-depth ...

Abstract: A detailed analysis of the effective thermal resistance for the bump foil of air foil bearings (AFBs) is performed. The presented model puts emphasis on the thermal contact resistances between the bump foil and the top ...

Abstract: The numerical stability and the convergence behavior of cosimulation methods are analyzed in this manuscript. We investigate explicit and implicit coupling schemes with different approximation orders and discuss three ...

Abstract: Abstract. This article presents an inexpensive passive approach for reducing the thermal bending deformations of rotor disks in gas thrust bearings, featuring an optimized design for the rotor disk. Small geometry changes ...

Abstract: In this manuscript, an implicit cosimulation method is analyzed, where the solvers are coupled by algebraic constraint equations. We discuss cosimulation approaches on index2 and on index1 level and investigate constant, ...

Abstract: A detailed elastogasdynamic model of a preloaded three-pad air foil journal bearing is presented. Bump and top foil deflections are herein calculated with a nonlinear beamshell theory according to Reissner. The two-dimensional ...