Title: Primary blast wave protection in the combat helmet design: a historical comparison between present day and World War I
Data Collector: Joost Op 't Eynde, Allen Yu, Chris Eckersley, Cameron Bass, Duke University, joost.opteynde@duke.edu
Date of collection: [March - May, 2017]
Location of Collection: Duke University, Durham, North Carolina

This repository consists of 46 seperate files in two different types of format, a .COL and a .txt. The .COL was created using WIN600E a software used by the MeDaq data collection system.
These files were then loaded into notepad++ and saved as .txt files so they can be used in a variety of analysis platforms. In the file structre, the acronyms in the file names refer to
the following:
ACH - Advanced Combat Helmet
GER - Stahlhelm M1916 Helmet used by the Germans
AMR - Brodie M1917 Helmet used by the Americans and British
FRC - Adrian M15 Helmet used by the French
BAR - Bare headed dummy, no helmet
HE - Helium, the gas used to drive the shockwave
M - Medium, the size of driver used

The files have general information in the first 15 lines:
	- FILENAME: Name of the file 
	- NAME: The title of the data in each column.
	- FILE_TYPE: ASCII
	- DATE: Date of recording
	- TIME: Time of recording
	- NUM_SERIES: The number assigned to the test the data was collected from, assigned in chronological order.
	- NUM_SAMPS: Number of samples
	- X_OFFSET:
	- INTERVAL: The time between data points in seconds (inverse of sampling rate).
	- VERT_UNITS: Units used
	- HORZ_UNITS: The units used by recoding software to plot the data, also the units of the first column of data. S stands for Seconds.
	- MAX_VAL: The maximum value in each column of data.
	- MIN_VAL: The minimum value in each column of data
	- TRIG_POINT: The index of the value where the triggering of the data recording occured (Time = 0).
	- DATA: All of the actual data values.


In all of the files there are twelve columns of data in the units shown. Some files contain a 13th data column that contains pressures used during tests and was not used for analysis.  

Column 1 is a time vector, the data was sampled at 200 kHz.
Columns 2-4 are the incident pressures of the pressure leaving the tube.
Columns 5-9 are the reflected pressures measured at various locations under the helmet: crown, right ear, left eye, forehead, and back of the head.
Columns 10-12 are the force in the x-direction, moment about the y axis, and force in the z-direction where the head and neck are joined.
Column 13 is the pressure inside of the driver that is filled with air to generate the shockwave.