The Method for Determining Optimal Analysis Length of Vibration Data Based on Improved Multiscale Permutation Entropy

Shock and vibration

Jinlin Huang¹  Peng Yan²  Yang Li³  Ziyu Li³  Jianwei Zhang⁴ 

[1] Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510635, Guangdong, China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, Hubei, China, whu.edu.cn;School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, Henan, China, ncwu.edu.cn;School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, Henan, China, ncwu.edu.cn;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, Hubei, China, whu.edu.cn;

DOI  :  10.1155/2021/6654089

来源: Hindawi Publishing Corporation

【 摘 要 】

Research on damage diagnosis or safety monitoring based on structural vibration response is one of the hot issues in the engineering field. The characteristic information of the structure is obtained by analyzing the structure response data. In the process of data analysis, the choice of data length is very important, which is related to the validity of the structure monitoring results. At present, the selection of data length is usually subjective, which reduces the rigor of the structure monitoring process. Therefore, a method based on improved multiscale permutation entropy (IMPE) is proposed to determine the optimal data analytical length (ODAL) of vibration data. This method creatively applies multiscale permutation entropy (MPE) to the field of data length analysis when processing nonlinear and nonstationary signals and optimizes MPE with the help of the improved coarse-grained method to obtain IMPE. IMPE is sensitive to different data lengths, and the entropy changes with the increase of the data length and tends to be stable. Here, the stable value is defined as a standard entropy. The entropy satisfying 97% of the standard entropy is used as the effective entropy, and the corresponding data length value of the effective entropy is selected as the ODAL of the vibration data. This method is suitable for many fields, provides a reliable data analytical length for data analysis, and has good engineering practicability.

【 授权许可】

CC BY