Acoustic Emission dataset for Defect Detection in Aluminum plates

Simulated data

File name: Simulation.zip

Simulated AE signals based on a ray-tracing algorithm taking into consideration reflections with the mechanical boundaries of the medium (reflection up to the 4th order), which corresponds to a 1x1x0.003 m square aluminum plate.

Each signal has been created by simulating the propagation between a transmitter (Tx, index from 1 to 40) and a Receiver (Rx, index from 1 to 25), grouped by Tx position and saved as a .mat struct ('data') containing the following fields:

• data.Rx = 2 x 25 matrix containing in the first and second row the x and y axis of the Rx position
• data.Rx = 2 x 25 matrix containing in the first and second row the x and y axis of the Tx position
• data.data = 8000 x 25 matrix containing the transmitted, propagated AE signal from Tx to Rx organized by column. Each AE instance constitutes of 8000 samples acquired at a sampling frequency of 2 MHz (indicated in the file name), one for each Rx given that Tx position.
• data.Label = 1x25 vector containing the ToA labels associated with each of the 25 Tx-rx pairs (per Tx position) computed by means of the Akaike Information Criterion. 

Experimental data

File name: Test_x0.xx_y0.yyFs2MHz_1x1x0.003_Al.csv

Experimental data collected with custom AE instrumentation as described in Ref 1. 

One single file is a collection of 3 tests (three repetitions of the impact event at the same position), each of them containing three signals acquired simultaneously by three sensors located in proximity of three corners of a 1x1x0.003 aluminum plate having the same geometrical and numerical characteristics of the numerical one. The sensors acquire 5000 samples at a rate of 2 MHz (indicated in the file name) with a pre-trigger window of 1500 samples. The specific coordinates of the sensors are:

• s1 [x = 0.05, y = 0.95] m
• s2 [x = 0.05, y = 0.05] m
• s3 [x = 0.95, y = 0.05] m

There are 9 files associated with as many impact positions, indicated by the "x0.xx_y0.yy" entry in the file name, with 0.xx and 0.yy corresponding to the x and y coordinate, respectively. Excitation has been provided by means of a waveform generator exciting a 3-cycle sinusoidal wave with central frequency of 250 kHz. More deatils about the electronics and the full setup are provided in the same reference above. 

This research work has been carried out within the Intelligent Sensor Systems Lab@University of Bologna, Italy. 

For any needs, warning or curiosities, please contact federica.zonzini@unibo.it