On damping entire bladed disks through dampers on only a few blades

Javier Avalos, Marc Mignolet

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The focus of this paper is on demonstrating the potential to damp entire bladed disks using dampers on only a fraction of the blades. This problem is first considered without the presence of random mistuning, and it is demonstrated that a few dampers at optimized locations can lead to a significant reduction in the forced response of the entire bladed disk. Unfortunately, this optimum design may not be robust with respect to random mistuning and a notable fraction of the reduction in forced response obtained may disappear because of mistuning. To regain the reduction in forced response but with mistuning present, robustness to mistuning is enhanced by using intentional mistuning in addition to dampers. The intentional mistuning strategy selected here is the A/B pattern mistuning in which the blades all belong to either type A or B. An optimization effort is then performed to obtain the best combination of A/B pattern and damper location to minimize the mistuned forced response of the disk. The addition of intentional mistuning in the system is shown to be very efficient, and the optimum bladed disk design does indeed exhibit a significant reduction in mistuned forced response as compared with the tuned system. These findings were obtained on both single-degree-of-freedom per bladedisk models and a reduced order model of a blisk.

Original languageEnglish (US)
Article number092503
JournalJournal of Engineering for Gas Turbines and Power
Volume132
Issue number9
DOIs
StatePublished - Sep 1 2010

Keywords

  • Blade damping
  • Blade vibration
  • Bladed disk
  • Damping optimization
  • Intentional mistuning

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Fuel Technology
  • Aerospace Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'On damping entire bladed disks through dampers on only a few blades'. Together they form a unique fingerprint.

  • Cite this