TY - JOUR

T1 - Transient Resonance Passage of a Mistuned Bladed Disk with and without Underplatform Dampers

AU - Brinkmann, Katharina

AU - Hoffmann, Thomas

AU - Panning-von Scheidt, Lars

AU - Stüer, Heinrich

N1 - Funding Information: The investigations were conducted as part of the joint research program InnoTurbinE in the frame of AG Turbo. The work was supported by the Bundesministerium für Wirtschaft und Klimaschutz (BMWK) as per resolution of the German Federal Parliament under grant number 03EE5040A. The authors gratefully acknowledge Siemens Energy AG for their financial support and the permission to publish this paper. The responsibility for the content of the publication rests with the authors.

PY - 2023/10/2

Y1 - 2023/10/2

N2 - 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.

AB - 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.

KW - geometric mistuning

KW - transient resonance passage

KW - turbine blade vibration measurement

KW - underplatform damper

UR - http://www.scopus.com/inward/record.url?scp=85180552182&partnerID=8YFLogxK

U2 - 10.3390/ijtpp8040038

DO - 10.3390/ijtpp8040038

M3 - Article

AN - SCOPUS:85180552182

VL - 8

JO - International Journal of Turbomachinery, Propulsion and Power

JF - International Journal of Turbomachinery, Propulsion and Power

IS - 4

M1 - 38

ER -