Influence of the excitation frequency in the electromechanical impedance method for SHM applications

Venu Gopal Madhav Annamdas; Piervincenzo Rizzo

doi:10.1117/12.815366

7 April 2009 Influence of the excitation frequency in the electromechanical impedance method for SHM applications

Venu Gopal Madhav Annamdas, Piervincenzo Rizzo

Proceedings Volume 7293, Smart Sensor Phenomena, Technology, Networks, and Systems 2009; 72930V (2009) https://doi.org/10.1117/12.815366
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

Electromechanical impedance (EMI) technique is receiving increasing attention in the area of structural health monitoring (SHM). In this technique, piezoelectric transducer (PZT) is either surface bonded to or embedded inside the host structure to be monitored. The PZT actuates harmonically in the presence of electric field to produce a structural response over a wide range of frequency, which is known as 'admittance signature'. These signatures serve as indicator to predict the health of the structure, any change in the signature is indication of presence of damage or other degradation in the structure. Sometimes the raw data associated with the applied frequency range is in excess of necessary data. In the present paper, an EMI based experimental study was conducted on steel, aluminum and concrete specimens to monitor load, crack and curing respectively for various frequency ranges. Admittance signatures of specimens were acquired for a wide frequency range of excitation. Later, statistical index was adopted to measure and compare the sensitivities for various narrower ranges within the wide frequency range. Additionally a novel signature gradient was used to characterize signatures at each frequency. Thus in this study an evaluation of sensitivity of EMI technique for various frequency bands to monitor load, crack and curing process was carried out in order to find out necessary frequency band suitable form wide frequency range. It is demonstrated that this approach can be applied to real structures and an initial assessment can be made to eliminate unnecessary data acquisition.

Citation Download Citation

Venu Gopal Madhav Annamdas and Piervincenzo Rizzo "Influence of the excitation frequency in the electromechanical impedance method for SHM applications", Proc. SPIE 7293, Smart Sensor Phenomena, Technology, Networks, and Systems 2009, 72930V (7 April 2009); https://doi.org/10.1117/12.815366

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available