On-line vibration monitoring for detecting fan blade damage

被引：0

作者：

Heyns, PS ^{[1
]}

Smit, WG ^{[1
]}

机构：

[1] Univ Pretoria, Dept Mech & Aeronaut Engn, Dynam Syst Grp, ZA-0002 Pretoria, South Africa

来源：

CONDITION MONITORING AND DIAGNOSTIC ENGINEERING MANAGEMENT | 2001年

关键词：

condition monitoring; damage detection; fan blades; on-line monitoring;

D O I：

10.1016/B978-008044036-1/50081-0

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The use of on-line vibration monitoring to detect and classify damage levels on fan blades is investigated. It is shown that output only data can be used to determine modal parameters such as natural frequencies with sufficient accuracy to be used as damage indicators. A finite element model is used to study the feasibility of using frequency shifts as damage indicators on rotating fan blades. These results indicate that certain mode shapes are more sensitive to damage at the root of the blade. An experimental fan blade damage simulator is then used to verify these findings experimentally. A hypothesis that the differences in frequency shifts between the finite element model and the measured frequencies, due to damage, is the result of global structural behaviour, is verified by using an extended finite element model. Local mode shapes make it possible to classify damage levels on individual blades, using one sensor per blade only. Damage levels of as low as 10% could be detected experimentally.

引用

页码：681 / 687

页数：7