This paper focuses on the optimization of intentional mistuning patterns for the reduction of the sensitivity of the forced response of bladed disks to random mistuning. Intentional mistuning is achieved here by using two different blade types (denoted as A and B) around the disk. It is thus desired to find the arrangement of these A and B blades (A/B pattern) that leads to the smallest 99th percentile of the amplitude of blade response in the presence of random mistuning. It is first demonstrated that there usually is a large number of local minima and further that the cost of a function evaluation is high. Accordingly, two novel, dedicated optimization algorithms are formulated and validated to address this specific problem. Both algorithms proceed in a two-step fashion. The first step, which consists of an optimization in a reduced space, leads to a series of good initial guesses. A local search from these initial guesses forms the second step of the methods. A detailed validation effort of this new procedure was next achieved on a single-degree-of-freedom-per-blade model, a reduced order model of a blisk, and that of an impeller considered in an earlier study. In all validation cases, the two novel algorithms were found to converge to the global optimum or very close to it at a small computational cost. Finally, the results of these optimization efforts further demonstrate the value of intentional mistuning to increase the robustness of bladed disks to random mistuning.
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SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
e-mail: yunhan@gmail.com
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
e-mail: marc.mignolet@asu.edu
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June 2014
Research-Article
Optimization of Intentional Mistuning Patterns for the Mitigation of the Effects of Random Mistuning
Yun Han,
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
e-mail: yunhan@gmail.com
Yun Han
Mem. ASME
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
Tempe, AZ 85287-6106
e-mail: yunhan@gmail.com
Search for other works by this author on:
Raghavendra Murthy,
Raghavendra Murthy
Mem. ASME
SEMTE,
and Aerospace Engineering,
Arizona State University,
e-mail: rnmurthy@asu.edu
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
Tempe, AZ 85287-6106
e-mail: rnmurthy@asu.edu
Search for other works by this author on:
Marc P. Mignolet,
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
e-mail: marc.mignolet@asu.edu
Marc P. Mignolet
Fellow ASME
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
Tempe, AZ 85287-6106
e-mail: marc.mignolet@asu.edu
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Jeff Lentz
Jeff Lentz
Department 93-34/301-134,
Phoenix, AZ 85072-2181
e-mail: jeff.lentz@honeywell.com
Honeywell Aerospace
,P.O. Box 52181
,Phoenix, AZ 85072-2181
e-mail: jeff.lentz@honeywell.com
Search for other works by this author on:
Yun Han
Mem. ASME
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
Tempe, AZ 85287-6106
e-mail: yunhan@gmail.com
Raghavendra Murthy
Mem. ASME
SEMTE,
and Aerospace Engineering,
Arizona State University,
e-mail: rnmurthy@asu.edu
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
Tempe, AZ 85287-6106
e-mail: rnmurthy@asu.edu
Marc P. Mignolet
Fellow ASME
SEMTE,
Faculties of Mechanical
and Aerospace Engineering,
Arizona State University,
Tempe, AZ 85287-6106
e-mail: marc.mignolet@asu.edu
Jeff Lentz
Department 93-34/301-134,
Phoenix, AZ 85072-2181
e-mail: jeff.lentz@honeywell.com
Honeywell Aerospace
,P.O. Box 52181
,Phoenix, AZ 85072-2181
e-mail: jeff.lentz@honeywell.com
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 3, 2013; final manuscript received November 30, 2013; published online February 11, 2014. Editor: David Wisler.
J. Eng. Gas Turbines Power. Jun 2014, 136(6): 062505 (9 pages)
Published Online: February 11, 2014
Article history
Received:
November 3, 2013
Revision Received:
November 30, 2013
Citation
Han, Y., Murthy, R., Mignolet, M. P., and Lentz, J. (February 11, 2014). "Optimization of Intentional Mistuning Patterns for the Mitigation of the Effects of Random Mistuning." ASME. J. Eng. Gas Turbines Power. June 2014; 136(6): 062505. https://doi.org/10.1115/1.4026141
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