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Stability of Blade-Casing Interference in Turbomachinery and the Design Alternatives on Damping Characteristics

[+] Author Affiliations
Nejat Olgac, Umut Zalluhoglu, Ayhan S. Kammer

University of Connecticut, Storrs, CT

Paper No. DSCC2014-6124, pp. V003T50A002; 7 pages
doi:10.1115/DSCC2014-6124
From:
  • ASME 2014 Dynamic Systems and Control Conference
  • Volume 3: Industrial Applications; Modeling for Oil and Gas, Control and Validation, Estimation, and Control of Automotive Systems; Multi-Agent and Networked Systems; Control System Design; Physical Human-Robot Interaction; Rehabilitation Robotics; Sensing and Actuation for Control; Biomedical Systems; Time Delay Systems and Stability; Unmanned Ground and Surface Robotics; Vehicle Motion Controls; Vibration Analysis and Isolation; Vibration and Control for Energy Harvesting; Wind Energy
  • San Antonio, Texas, USA, October 22–24, 2014
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 978-0-7918-4620-9
  • Copyright © 2014 by ASME

abstract

Bladed disks in turbomachinery are commonly designed to operate within a very small clearance from the stationary shroud (casing). For variety of reasons, however, they interfere with each other during routine operation which results in undesirable vibrations. The novel idea in this paper originates from the claim that this dynamics is inherently akin to internal machining operation which uses compliant cutters (blades) with relatively rigid workpiece (casing). It is known that machining processes suffer from a phenomenon called chatter, which has been studied over decades to a considerable extend. We propose a new perspective to investigate the stability of blade-casing contact vibrations by a modeling approach borrowed from chatter literature. The mathematical model arises with a signature time-delayed dynamics for which we utilize a recent analytical tool called the Cluster Treatment of Characteristic Roots (CTCR). We present an exhaustive stability analysis and study the effects of altering damping characteristics in the casing structure.

Copyright © 2014 by ASME

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