0
TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Identification of Frequency-Dependent Parameters in a Flexible Rotor System

[+] Author and Article Information
Qingyu Wang1

Department of Mechanical and Aerospace Engineering, University of Virginia, ROMAC Laboratories, 122 Engineer’s Way, Charlottesville, VA 22904qw4k@virginia.edu

Eric H. Maslen

Department of Mechanical and Aerospace Engineering, University of Virginia, ROMAC Laboratories, 122 Engineer’s Way, Charlottesville, VA 22904ehm7s@virginia.edu

1

Corresponding author.

J. Eng. Gas Turbines Power 128(3), 670-676 (Sep 28, 2005) (7 pages) doi:10.1115/1.2135814 History: Received August 25, 2005; Revised September 28, 2005

In a rotor-bearing system, there are usually some under- or unmodeled dynamic components that are considered frequency dependent, such as foundations, bearings, and seals. This paper presents a method to identify the dynamic behavior of these components using an otherwise accurate engineering model of the system in combination with available measurements of system frequency response functions. The approach permits treatment of flexible rotors and allows that the system test excitations and measurement sensors are not collocated. Because all engineering models contain some residual error and all measurements incorporate an element of noise or uncertainty, the quality of the identified parameters must be estimated. This paper introduces application of μ analysis to solve this problem, resulting in acceptable solution time and hard guarantees of solution reliability. Two illustrative examples are provided, showing that the presented approach is an efficient method to identify and bound these parameters.

FIGURES IN THIS ARTICLE
<>
Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Identification processes: upper route is parametric updating, lower route is nonparametric updating

Grahic Jump Location
Figure 2

Analysis Framework

Grahic Jump Location
Figure 3

Uncertainty cloud and bounds

Grahic Jump Location
Figure 4

Simplified rotor-bearing-foundation system

Grahic Jump Location
Figure 5

Uncertainty bound

Grahic Jump Location
Figure 6

Normalized uncertainty upper bounds

Grahic Jump Location
Figure 7

Uncertainty bounds for ω=37.25rad∕s, where – outer bound of MU, - - inner bound of MU, - · - NM

Grahic Jump Location
Figure 9

Excitations and sensors diagram

Grahic Jump Location
Figure 10

Identification with bounds for 1% error

Grahic Jump Location
Figure 11

Identification with bounds for 4% error

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In