An Adaptive Operational Modal Analysis under Non-White Noise Excitation Using Hybrid Neural Networks

Applied Sciences

Ronghui Zheng¹  Siyu Ren¹  Huaihai Chen¹  Min Qin¹  Xudong He¹ 

[1] State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

关键词: operational modal analysis;    convolutional neural network;    gate recurrent unit;    non-white noise excitation;   

DOI  :  10.3390/app12052471

来源: DOAJ

【 摘 要 】

To adaptively identify the modal parameters for time-invariant structures excited by non-white noise, this paper proposes a new operational modal analysis (OMA) method using hybrid neural networks. In this work, taking the acceleration response directly as the input data of the networks not only simplifies the data processing, but also retains all the characteristics of the data. The data processed by the output function is the output data of the network, and its peak corresponds to the modal frequency. The proposed output function greatly reduces the computational cost. In addition, a small sample dataset ensures that the hybrid neural networks identify the modal parameters with the highest accuracy in the shortest possible time. Interestingly, the hybrid neural networks combine the advantages of the convolutional neural network (CNN) and gate recurrent unit (GRU). To illustrate the advantages of the proposed method, the cantilever beam and the rudder surface excited by white and non-white noise are taken as examples for experimental verification. The results reveal that the proposed method has a strong anti-noise ability and high recognition accuracy, and is not limited by ambient excitation type.

【 授权许可】

Unknown