ReadMe

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This data collection consists of measurements of the noise radiated by a finite length airfoil with different airfoil profiles with flat and rounded tips at a range of angles of attack and Reynolds number. 
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This data colleciton consists of:

     --> 1 folder for processed data, named 'Processed_data'
	 --> 16 folders consist of one-third-octave band tip noise spectra for different cases
	 --> OnethirdOctaveband_freq.txt

     --> 1 folder for spectra, named 'Spectra'
	 --> Positions_of_47_microphones.csv
	 --> Noise_spectra.m
	 --> 16 one-third-octave band tip noise spectra in .tif

     --> 1 folder for raw data for each table and figure in the paper, named 'Raw_data'

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This file includes following sections:

1. Prerequisites 

2. Detailed analysis

	2.1. File name
		
	2.2. Spectra

3. Recommendation (*)


Some examples of acoustic spectra in one-third-octave band in .tif format are presented in the 'Spectra' folder.
Please refer to Section 2.1 for the files naming rules.

####################################################### 1. Prerequisites ####################################################################
                            [Please make sure all the prerequisites are met before processing the data]

1/1 Install Matlab (version 2018b used by authors)
    --> Please follow the link (https://www.mathworks.com/products/matlab.html) and get it installed (licence is required)

####################################################### 2. Detailed analysis #################################################################

########## 2.1. File name

NACAxxxx:   airfoil profile for the NACA 4-digit airfoil, including NACA 0012, 0015, 0018, 2412, 4412 and 6412.
T:          tripping condition. The airfoil is tripped on both sides at the 10 % chord length.
F:          flat tip.
R:          rounded tip.
p:          varies from 1 to 9, corresponding to the Reynolds number of 25 to 225k (25:25:225), respectively. 

A typical file would be named as follows:
file      	  	= 'NACAxxxx TipGeometry TrippingCondition ReynoldsNumberSeries(p)'
where
xxxx      	  	= '0012', '0015', '0018', '2412', '4412' and '6412'
TipGeometry 	  	= 'F' and 'R'
TrippingCondition 	= 'T' and none (for non-tripped case)
ReynoldsNumberSeries(p) = 'p1', 'p2', 'p3', 'p4', 'p5', 'p6', 'p7', 'p8' and 'p9'

For example:

NACA0012Rp1.txt  is the processed data for NACA0012 airfoil with rounded tip at all angles of attack (0, 5, 10 and 20 deg in this particular case) and Reynolds number of 25000, based on chord.
NACA6412TFp9.txt is the processed data for tripped NACA6412 airfoil with flat tip at all angles of attack (-10, 0:2.5:15, 20 deg in this particular case) and Reynolds number of 225000, based on chord.
OnethirdOctaveband_freq.txt is the one-third-octave band centre frequency in Hz. This file can be used for all the cases to get the one-third-octave band tip noise spectra against one-third-octave band soud pressure level provided in the 'Processed_data' folder.

########## 2.2. Spectra

[The processed data are in frequency domain in .txt format, which can be found in the 'Processed_data' folder. These data can be further processed using MatLab to generate spectra]

>> Open 'Noise_spectra.m' in the 'Spectra' folder with MatLab. 

>> Enter 'Suptitle'. (optional)

>> Add file path for both one-third-octave band sound pressure level and frequency.
   For example:
   filename1=strcat('filepath/filenamep',num2str(m),'.txt') and filename2='filepath/OnethirdOctaveband_freq.txt'
   'filepath/filename' for both lines should be replaced by the same directory for 'Processed_Data' folder in this data collection.
   Please only change 'filepath/filename' and keep the rest of these two lines unchanged.

>> Change the legend. 
   Delete the unwanted angle of attack in line 25.
   For example: 
   0 : 2.5 : 15 and 20 deg for symmetric airfoils with flat tip; -10, 0 : 2.5 : 15 and 20 deg for cambered airfoils with flat tip; 0, 5, 10, 20 deg for NACA0012 with rounded tip and 0 : 5 :20 deg for NACA6412 with rounded tip.

>> Figure settings. (optional)
   Please refer to the link below for further details: https://www.mathworks.com/help/matlab/ref/plot.html.

>> The range of x axis (frequency) and y axis (sound pressure level) can be changed by changing 'xlim ([1000 20000])' and 'ylim ([0 80])', respectively. 

>> Run the file.
   Click the green triangle button named 'Run' on the top of the window or click F5 on the keyboard.


####################################################### 3. Recommendation #################################################################

Authors highly recommend that readers get access to the whole database, including the microphone time pressure histories (raw data), sound maps and Python scripts, and proceed further analysis of interests. The size of the raw data is too large to be stored online and accessed without any login credentials.
The whole data collection and more details can be found at: 

Moreau Danielle, Zhang Tingyi, Geyer Thomas, Doolan Con: Tip vortex formation noise produced by wall-mounted finite airfoils with flat and rounded tip geometries . UNSW.dataset.
https://doi.org/10.26190/5daf74780481b


>>All the best with your research!<<