Numerical and experimental bifurcation analysis of the non-linear dynamics of a pipe with a radial annular stop
Résumé
Steam generators inner tubes wear out over time due to flow induced vibrations and impacts with the support structures. In order to better understand the non-linear response of these structures, a simplified mock-up of a steam generator straight section placed inside a hole with clearance was used to compare numerical results and measurements.
These numerical results were obtained using a regularized contact and the harmonic balancing method (HBM), which allowed to calculate the multiple stationary existing responses of the system, as well as the bifurcation points. Parametric bifurcation tracking with respect to the eccentricity of the tube with respect to the annular stop has been carried out.