On Direct And Inverse Problems Related To Longitudinal Impact Of Non Uniform Elastic Rods
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On direct and inverse problems related to longitudinal impact of non-uniform elastic rods
Author: Burgert, Jens
language: en
Publisher: KIT Scientific Publishing
Release Date: 2021-05-07
The impact of two non-uniform elastic rods is considered and a recursive method was developed that solves the inverse problem: Find the location-dependent impedance function of the impacting rod that generates a prescribed impact force. The developed method delivers exact solutions in closed-form. Moreover, a condition is derived which states if a physically meaningful solution exists. Finally, the underlying 1D model has been validated experimentally.
On the Influence of Piecewise Defined Contact Geometries on Friction Dampers
Author: Aramendiz Fuentes, Jimmy Alberto
language: en
Publisher: KIT Scientific Publishing
Release Date: 2023-09-12
This work considers dampers that do not solely focus on a single strategy but instead combine them. The capabilities of conventional dry friction dampers are expanded by taking into account piecewise defined contact geometries. This leads to friction dampers that change their behavior depending on the amplitude of the oscillations. The vibration damping device in this work, introduces damping at high oscillation amplitudes and takes advantage of absorption at low oscillation amplitudes.
Dynamics of Rotors on Refrigerant-Lubricated Gas Foil Bearings
Author: Leister, Tim
language: en
Publisher: KIT Scientific Publishing
Release Date: 2021-10-28
The gas foil bearing (GFB) technology is a key factor for the transition to oil-free rotating machinery. Among numerous advantages, GFBs offer the unique ability to be lubricated with working fluids such as refrigerants. However, the computational analysis of refrigerant-lubricated GFB–rotor systems represents an interdisciplinary problem of enormous complexity. This work pushes forward existing limits of feasibility and establishes a new strategy that enables stability and bifurcation analyses.