A Mistuned Forced Response Analysis of an Embedded Compressor Blisk using a Reduced Order Model

[+] Author and Article Information
Mauricio Gutierrez

Heat and Power Technology, Royal Institute of Technology, 10044 Stockholm, Sweden

Paul Petrie-Repar

Heat and Power Technology, Royal Institute of Technology, 10044 Stockholm, Sweden

Robert Kielb

Department of Mechanical Engineering, Duke University, Durham, NC 27708

Nicole L. Key

Zucrow Laboratories, School of Mechanical Engineering, Purdue University, IN 47907

1Corresponding author.

ASME doi:10.1115/1.4041280 History: Received July 31, 2018; Revised August 08, 2018


Accuracy when assessing mistuned forced response analyses is still a mayor concern. Since a full coupled analysis is still very computational expensive, several simplifications and reduced order models are carried out. The use of a reduction method, the assumptions and simplifications, generate different uncertainties that challenge the accuracy in the results. Experimental data are needed for validation and also to understand the propagation of these uncertainties. This paper shows a detailed mistuned forced response analysis of a compressor blisk. The blisk belongs to the Purdue Three-Stage(P3S) Compressor Research Facility. Two different stator-rotor-stator configurations of 38 and 44 upstream stator vanes are taken into consideration. Several loading conditions are analyzed at three different speed lines. A reduced order model known as subset nominal mode (SNM), has been used for all the analyses. This reduction takes as a basis a set of modes within a selected frequency spectrum. It can consider a complete family of modes to study the disk-blade modal interaction. A detailed comparison between the predicted and measured results have been performed, showing a good agreement for the high loading conditions.

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