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In order to overcome the current problems of the transmission and storage of the measured data in the structural health monitoring system, it was necessary to put forward the compression sensing method to the neural network system and electro-mechanical impedance (EMI) technology. The finite element EMI model was first established for a framed structure and the conductance data were accordingly obtained...
This paper presents an experimental investigation of damage detection of a steel frame using electro-mechanical impedance (EMI) signatures. Relying on high frequency excitation, EMI technique is very sensitive to minor damage in structures. Damages are introduced by completely loosening bolts over several locations on the structure. Experimental data are then analyzed by a damage index named RMSD...
A radiated disturbance measurement is an important EMC test. However, it is difficult to measure a highly-directive radiated disturbance accurately. Current methods and software can't resolve this problem very well. Therefore a novel and accurate approach is presented in this paper: the scanning area of the radiated disturbance measurement was divided into units and a process called “double-scan”...
Based on the finite element method, an electromechanical impedance (EMI) model for a damaged plate with imperfectly bonded piezoelectric patches is established in the paper. The property of bonding layer between the PZT sensor/actuators and the host plate is taken into account based on the peel stress model as well as the shear lag model. The damage appearing in the plate is modeled by a change in...
In practical application of electro-mechanical impedance (EMI) technique, the monitored structure is constantly undergoing change due to external boundary conditions and the surrounding ambience. This change, in most cases, is considered to be normal and a part of the everyday use of the structure. The aim of this paper is to examine and obtain a better understanding of practical issues that are a...
An accurate electro-mechanical impedance (EMI) model for analytical crack detection of a Timoshenko beam is established based on the improved reverberation-ray matrix method via the recursive formulations. The crack is treated as a massless rotational spring. A pair of PZT patches with free ends symmetrically bonded onto the beam is assumed in a state of pure one-dimensional axial motion under an...
A hybrid method combining electro-mechanical impedance (EMI) technique and artificial neural network (ANN) is proposed to detect damages in structural systems. The structural members are treated as Timoshenko beams for flexural motion as well as the damages are modeled by changes in Young's modulus in the damaged area. For a structural member with surface-bonded PZT wafers, a coupled system is considered...
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