Current efforts to model multistage turbomachinery systems rely on calculating independent constraint modes for each degree-of-freedom (DOF) on the boundary between stages. While this approach works, it is computationally expensive to calculate all the required constraint modes. This paper presents a new way to calculate a reduced set of constraint modes referred to as Fourier constraint modes (FCMs). These FCMs greatly reduce the number of computations required to construct a multistage reduced order model (ROM). The FCM method can also be integrated readily with the component mode mistuning (CMM) method to handle small mistuning and the pristine rogue interface modal expansion (PRIME) method to handle large and/or geometric mistuning. These methods all use sector-level models and calculations, which make them very efficient. This paper demonstrates the efficiency of the FCM method on a multistage system that is tuned and, for the first time, creates a multistage ROM with large mistuning using only sector-level quantities and calculations. The results of the multistage ROM for the tuned and large mistuning cases are compared with full finite element results and are found in good agreement.
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July 2018
Research-Article
Multistage Blisk and Large Mistuning Modeling Using Fourier Constraint Modes and PRIME
Eric Kurstak,
Eric Kurstak
Gas Turbine Laboratory,
Department of Mechanical and
Aeronautical Engineering,
The Ohio State University,
Columbus, OH 43235
e-mail: kurstak.1@osu.edu
Department of Mechanical and
Aeronautical Engineering,
The Ohio State University,
Columbus, OH 43235
e-mail: kurstak.1@osu.edu
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Kiran D'Souza
Kiran D'Souza
Gas Turbine Laboratory,
Department of Mechanical and
Aeronautical Engineering,
The Ohio State University,
Columbus, OH 43235
e-mail: dsouza.60@osu.edu
Department of Mechanical and
Aeronautical Engineering,
The Ohio State University,
Columbus, OH 43235
e-mail: dsouza.60@osu.edu
Search for other works by this author on:
Eric Kurstak
Gas Turbine Laboratory,
Department of Mechanical and
Aeronautical Engineering,
The Ohio State University,
Columbus, OH 43235
e-mail: kurstak.1@osu.edu
Department of Mechanical and
Aeronautical Engineering,
The Ohio State University,
Columbus, OH 43235
e-mail: kurstak.1@osu.edu
Kiran D'Souza
Gas Turbine Laboratory,
Department of Mechanical and
Aeronautical Engineering,
The Ohio State University,
Columbus, OH 43235
e-mail: dsouza.60@osu.edu
Department of Mechanical and
Aeronautical Engineering,
The Ohio State University,
Columbus, OH 43235
e-mail: dsouza.60@osu.edu
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 28, 2017; final manuscript received September 13, 2017; published online April 10, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Jul 2018, 140(7): 072505 (10 pages)
Published Online: April 10, 2018
Article history
Received:
August 28, 2017
Revised:
September 13, 2017
Citation
Kurstak, E., and D'Souza, K. (April 10, 2018). "Multistage Blisk and Large Mistuning Modeling Using Fourier Constraint Modes and PRIME." ASME. J. Eng. Gas Turbines Power. July 2018; 140(7): 072505. https://doi.org/10.1115/1.4038613
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