A new detection method for structural non-linearities

被引：0
|
作者：
Roscher, T [1 ]
Allemang, RJ [1 ]
Phillips, AW [1 ]
机构：
[1] Univ Cincinnati, SDRL, Cincinnati, OH 45221 USA
来源：
NOISE AND VIBRATION ENGINEERING, VOLS 1 - 3, PROCEEDINGS | 2001年
关键词：
D O I：
暂无
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
It has been observed that during a modal test of a structure, various forcing levels involving broadband excitation cause the FRF estimates to show non-coherent behavior over a certain frequency range. Even if it is believed that these distortions are caused by structural non-linearities rather than digital signal processing, a solid detection method is still not available. This paper proposes a method, which is able to determine whether structural non-linearities are indeed the source of the observed FRF and coherence distortions. This is done by formulating a new coherence function (combined coherence, CCOH) using temporal and spatial information. After explaining the physical significance/meaning and computation of the new combined coherence, this new detection method is applied to a 4-DOF simulation model in several non-linear test cases.
引用
收藏
页码：695 / 702
页数：8
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