Accession Number:

ADA374336

Title:

An Electronic Speckle Pattern Interferometry System for the Study of Mistuned Bladed Disks

Descriptive Note:

Final rept. 1 Feb 1998-31 Jul 1999

Corporate Author:

MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING AND APPLIED MECHANICS

Personal Author(s):

Report Date:

2000-01-17

Pagination or Media Count:

9.0

Abstract:

A state-of-the-art facility has been developed for the experimental study of the vibratory response of bladed-disk assemblies. An Electronic Speckle Pattern Interferometry system provides real-time, full-field imaging of the vibration of a test specimen, while a Single Point Laser Vibrometer, mounted on a two-stage linear positioning assembly, provides high accuracy quantitative vibration measurements at any location on the surface of the specimen. Vibration of the test specimen is driven by a novel acoustic excitation system, which delivers a traveling-wave forcing to the blink specimen that replicates the excitation to which industrial bladed disks are subject. A 24-blade experimental blink integral bladed disk has been designed and manufactured to precision tolerances specifically for use in this experimental facility. The blink is nearly perfectly tuned but can be systematically mistuned in a controlled fashion in order to study mistuning phenomena. The setup has been shown to be extremely effective at rapidly identifying and accurately quantifying the complex vibration characteristics of blinks. The measurement capabilities provided with this unique facility will allow the dynamic behaviors in both tuned and mistuned configurations to be thoroughly documented and compared with predictions based on existing and developing theories of mistuning phenomena. This facility will also be used to develop a method for identifying the mistuning characteristics of industrial blinks.

Subject Categories:

  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE