A Novel Damage Indicator Based on the Electromechanical Impedance Principle for Structural Damage Identification

Sensors

Pin Zhou¹  Hongping Zhu¹  Dansheng Wang¹ 

[1] School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, 430074, China;

关键词: structural damage identification;    lead zirconate titanate (PZT);    fourth-order voltage statistical moment (FVSM);    beam structure;    differential evolution algorithm (DEA);    electromechanical impedance (EMI);   

DOI  :  10.3390/s18072199

来源: DOAJ

【 摘 要 】

This paper presents a novel structural damage detection indicator, i.e., fourth-order voltage statistical moment (FVSM) based on the electromechanical impedance (EMI) principle, and then proposes a two-step damage detection method based on the novel indicator and a differential evolution algorithm (DEA). In this study, several lead zirconate titanate (PZT) sensors bonded to an experimental steel beam were utilized to acquire the time-domain voltage responses. On this basis, the fourth-order voltage statistical moments (FVSMs) of the voltage responses are computed to locate the damage element in the detected structure, and the proposed damage detection method is utilized to quantify the damage. In addition, theoretical PZT voltage responses are also calculated based on the piezoelectric theory and the spectral element method (SEM). Experimental results verify the accuracy of the theoretical voltage values and the effectiveness of the proposed damage indicator. Results indicate that the FVSM is effective in locating the damage element. Integrated with DEA, the proposed technique is capable of quantifying damage.

【 授权许可】

Unknown