Turbine engine blades are subject to extreme dynamic vibrational
loads during normal operations. Harmonic forcing produced from
periodic wakes created by fixed stators can excite blade resonant
frequencies. Prolonged or repeated exposure to these forces can
cause vibration-induced fatigue, otherwise known as High Cycle
Fatigue (HCF). HCF effects are magnified by small material,
manufacturing and geometrical irregularities among the blades,
called mistuning. Structural mistuning can result in some blades
experiencing stresses much higher than would be encountered in a
perfect structure. Blade amplitude increases of over 100% have been
observed in blades with natural frequencies less than 2% off their
nominal value. Premature blade failures, operational costs and
engine servicing all increase due to the HCF problem. This study
offered a novel approach to characterize mistuning effects on
forced vibration behavior of bladed disks. A model fan reduced in
dynamic scale from an operational jet engine fan and with weak
inter-blade coupling was fabricated.
General
Imprint: |
Biblioscholar
|
Country of origin: |
United States |
Release date: |
October 2012 |
First published: |
October 2012 |
Authors: |
Colin J Duffield
|
Dimensions: |
246 x 189 x 9mm (L x W x T) |
Format: |
Paperback - Trade
|
Pages: |
158 |
ISBN-13: |
978-1-249-59412-3 |
Categories: |
Books >
Social sciences >
Education >
General
|
LSN: |
1-249-59412-X |
Barcode: |
9781249594123 |
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