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Finite Element Simulation and Piezoelectric Sensor Array-driven Two-Stage Impact Location on Composite Structures

PROCESSES 2024年第12期12卷 2675-2675页

作者： Wang, Zhiling Zhong, Yongteng Jinling Inst Technol Sch Mech & Elect Engn Nanjing 211169 Peoples R China Wenzhou Univ Coll Mech & Elect Engn Wenzhou 325035 Peoples R China

Impact monitoring is an effective approach to ensuring the safety of composite structures. The accuracy of current algorithms mostly depends on the number of physical sensors, which is not an economical way for large-area composite structures. In order to combine the advantages of sparse and dense arrays, a two-stage collaborative approach is proposed to locate the general areas and precise positions of impacts on composite structures. In Stage I, the steering vector information of the possible position is simulated according to the principle of array sensor signal processing, and a virtual array sparse feature map is constructed. When an actual impact arrives, a similarity algorithm is then used to find the suspected area in the map, which narrows down the search area to a large extent. In Stage II, a compensated two-dimensional multiple signal classification (2d-music) algorithm-based imaging method is applied to estimate the precise position of the impact in the suspected area. Finally, the accuracy and effectiveness of the proposed method are validated by numerical simulation and experiments on a carbon fiber composite panel. Both numerical and experimental results verify that the two-stage impact location method can effectively monitor composite structures with sufficient accuracy and efficiency.

关键词： two-stage impact location finite element simulation sensor array 2d-music algorithm composite structures

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FEM simulation based adaptive sensors array error compensation method for impact monitoring on stiffened composite structures

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THIN-WALLEd STRUCTURES 2022年 174卷 109074-109074页

作者： Ren, Li Zhong, Yongteng Xiang, Jiawei Wenzhou Univ Coll Mech & Elect Engn Wenzhou 325035 Peoples R China

To eliminate the sensor array based impact localization bias on stiffened composite structures, a finite element method (FEM) simulation based adaptive sensors array errors compensation method for impact monitoring is introduced. Firstly, detailed analysis and comparison discussion about Lamb wave propagation errors between the simple and stiffened plate are provided using FEM simulation, and the gain-phase errors obtained are structured as a array error matrix. Secondly, array error matrix is substituted into the steering vector of standard two-dimensional Multiple Signal Classification (2d-music) algorithm to compensate the stiffener effect. And then initial estimates of impact could be estimated by the compensated 2d-music algorithm. Finally substituting these initial estimates, the cost function is minimized by adaptive iterative to calculate the reasonable location of the impact source. The experiments on a carbon fiber composite stiffened plate demonstrate the validity and effectiveness of the proposed method.

关键词： Stiffened composite structures Gain-phase error compensate Finite element model simulation 2d-music algorithm

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