Department of Aerospace Engineering, The Pennsylvania State University, State College, Pennsylvania 16802, USA.
J Acoust Soc Am. 2010 Feb;127(2):EL48-53. doi: 10.1121/1.3290175.
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.
提出了一种非线性结构强度概念，作为识别显示非线性振动行为的缺陷的一种方法。研究了连接加强筋和平板的有松动紧固件的铆接接头的非线性结构动力响应。激励产生具有主导弯曲分量的弹性波，引发板和加强筋之间的非线性接触，从而产生具有丰富非线性谐波的动态响应。在超谐频率下评估实验结构强度图。该技术为非线性类型缺陷的特征化和二维可视化提供了一种实验方法。
