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Mistuned Higher-Order Mode Forced Response of An Embedded Compressor Rotor, Part II: Mistuned Forced Response Prediction

[+] Author and Article Information
Jing Li

Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708
jing.li3@ge.com

Nyansafo Aye-Addo

Department of Mechanical Engineering, Purdue University, 500 Allison Road, West Lafayette, IN 47907
payeaddo@purdue.edu

Robert Kielb

Professor, Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708
rkielb@duke.edu

Nicole L. Key

Professor, Department of Mechanical Engineering, Purdue University, 500 Allison Road, West Lafayette, IN 47907
nkey@purdue.edu

1Corresponding author.

ASME doi:10.1115/1.4038519 History: Received November 07, 2017; Revised November 16, 2017

Abstract

This paper is the second part of a two-part paper that presents a comprehensive study of the higher-order mode mistuned forced response of an embedded rotor blisk in a multi-stage axial research compressor. The resonant response of the second-stage rotor (R2) in its first chordwise bending (1CWB) mode due to the second harmonic of the periodic passing of its neighboring stators (S1 and S2) is investigated computationally and experimentally at three steady loading conditions in the Purdue Three-Stage Compressor Research Facility. A Non-Intrusive Stress Measurement System (NSMS, or blade tip-timing) is used to measure the blade vibration. Two reduced-order mistuning models of different levels of fidelity are used, namely the Fundamental Mistuning Model (FMM) and the Component Mode Mistuning (CMM), to predict the response. Although several modes in the 1CWB modal family appear in frequency veering and high modal density regions, they do not heavily participate in the response such that very similar results are produced by the FMM and the CMM models of different sizes. A significant response amplification factor of 1.5~2.0 is both measured and predicted, which is on the same order of magnitude of what was commonly reported for low-frequency modes. In this study, a good agreement between predictions and measurements is achieved for the deterministic analysis. This is complemented by a sensitivity analysis which shows that the mistuned system is highly sensitive to the discrepancies in the experimentally determined blade frequency mistuning.

Copyright (c) 2017 by ASME
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