Structure impact localization method based on 2D linear array and spatial filter without wave velocity

被引：0
|
作者：
Liu, Bin [1 ,2 ]
Qiu, Lei [1 ]
Yuan, Shenfang [1 ]
机构：
[1] State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
[2] Department of Air Force Military Transportation, Air Force Logistics College, Xuzhou 221006, China
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2014年 / 35卷 / 06期
关键词：
Composite materials are widely used in aerospace structures. But invisible damages will occur on them after suffering impact from external objects. Therefore; online structural health monitoring of impact events for composite structures is essential. One of the focuses of current research on impact location is based on piezoelectric sensors (PZTs) and Lamb wave. But the anisotropy of the Lamb wave in a composite structure makes it difficult to use it to locate the position of impact. In this paper; the algorithm of spatial filter for impact location is extended to composite structures and the theory of impact location by the spatial filter without the information of wave velocity is studied. The method of 2D linear PZTs array and spatial filter is proposed for impact location without wave velocity. Firstly; a narrowband Lamb analytic signal is extracted from the broadband impact response signal by a complex Shannon wavelet transform. Then; the angle of impact position relative to the array is calculated by the spatial filter without using the Lamb velocity. Finally; the impact position is calculated by the impact localization formula without velocity. This method is verified on a carbon fiber reinforced polymer. The verification results show that the method proposed can locate the structure impact without using the Lamb velocity in composite structures; and the error of localization is less than 1 cm;
D O I：
10.7527/S1000-6893.2013.0462
中图分类号：
学科分类号：
摘要：
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页码：1633 / 1642
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