Affiliation:
1. Institute of Dynamics and Vibration Research, Leibniz University Hannover, 30823 Garbsen, Germany
2. Siemens Energy AG, 45478 Mülheim a. d. Ruhr, Germany
Abstract
In this work, the vibration response of an academic free-standing turbine blisk is analyzed in regard to transient resonance passages. Measurement data are recorded using strain gauges and tip timing to evaluate the blades first bending mode both linearly and with two different types of underplatform dampers. These results are validated against steady-state responses and show good agreement with each other. To examine the effects of a transient resonance passage, response functions of each blade are evaluated both with and without the underplatform dampers. It is shown that friction damping is able to inhibit any appearance of a transient ring-down. Additionally, a multi-mass oscillator model with frictional contacts is analyzed, which qualitatively exhibits the same dynamics as the measurements. Due to geometric mistuning, all blades exhibit different vibration responses. This can lead to a transient amplitude amplification, which is observed on several blades. Analogously, this phenomenon can be mitigated by friction damping.
Funder
Bundesministerium für Wirtschaft und Klimaschutz
Siemens Energy AG
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering