A Test-Case on Continuation Methods for Bladed-Disk Vibration with Contact and Friction
Bladed-disks in turbo-machines experience harsh operating conditions and undergo high vibration amplitudes if not properly damped. Friction at the blade-to-blade or blade-to-disk interfaces plays a key role in dampening the high amplitudes. Due to the inherent complexity of these structures and non-linearities introduced by the friction joints, accurate response prediction becomes very difficult. There are variety of methods in the literature to predict non-linear vibration due to contact friction. However, their application to the bladed-disks remains limited. Furthermore, there are not many 3D realistic test-cases in the open literature for testing those methods and serve as a benchmark. A bladed-disk representative of a real turbine is presented as an open numerical test-case for the research community. It is characterized by a blade root joint and a shroud joint. The bladed-disk sector is meshed in different ways along with component mode synthesis (CMS) model order reduction for onward non-linear computations. The steady-state solution is obtained by multi-Harmonic Balance method and then continuation method is employed to predict the non-linear frequency response. Thus, it can serve as a case for testing previous and new methods as well as a benchmark for comparative studies.
KeywordsBladed-disk Cyclic symmetry Nonlinear forced response MHBM Continuation method
This work is a part of the project EXPERTISE that received funding from the European Union’s H2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 721865. The authors are grateful to the ND-CSI Non-linear Dynamics of Coupled Structures and Interfaces Summer School 2018 organizers.
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