Structural damage identification in plates via nonlinear structural intensity maps

被引：23

作者：

Semperlotti, Fabio ^{[1
]}

Conlon, Stephen C. ^{[1
]}

机构：

[1] Penn State Univ, Dept Aerosp Engn, State Coll, PA 16802 USA

来源：

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2010年 / 127卷 / 02期

关键词：

condition monitoring; elastic waves; harmonics; plates (structures); structural acoustics; vibrations; POWER-FLOW; FIELDS;

D O I：

10.1121/1.3290175

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

A nonlinear structural intensity concept is presented as an approach for the identification of defects displaying nonlinear vibration behavior. The nonlinear structural dynamic response exhibited by a riveted joint with loosened fasteners connecting a stiffener with a flat panel is investigated. The excitation, generating elastic waves with dominant bending components, triggers the nonlinear contact between the plate and the stiffener inducing a dynamic response rich with nonlinear harmonics. Experimental structural intensity maps are evaluated at the super-harmonic frequencies. This technique provides an experimental approach for the characterization and two dimensional visualization of nonlinear types of defects.

引用

页码：EL48 / EL53

页数：6

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