File:Atmospheric sound absorption coefficient.svg
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| Description |
English: References
MATLAB code to produce the figure clear all;
clc ;
close all;
T_0 = 293.15;
T_01 = 273.16 ;
T = 20 + 273.15;
p_s0 = 1;
F = logspace(1,6);
hr = 0;
psat = p_s0*10^(-6.8346*(T_01/T)^1.261 + 4.6151);
h = p_s0*(hr)*(psat/p_s0);
F_rO = 1/p_s0*(24 + 4.04*10^4*h*(0.02+h)/(0.391+h));
F_rN = 1/p_s0*(T_0/T)^(1/2)*( 9 + 280*h*exp(-4.17*((T_0/T)^(1/3)-1)) );
alpha_ps_0 = 100*F.^2./p_s0.*( 1.84*10^(-11)*(T/T_0)^(1/2)...
+ (T/T_0)^(-5/2)*(0.01278*exp(-2239.1/T)./(F_rO + F.^2/F_rO)...
+ 0.1068*exp(-3352/T)./(F_rN + F.^2/F_rN) ) );
alpha_ps_0 = alpha_ps_0*20/log(10);
hr = 10;
psat = p_s0*10^(-6.8346*(T_01/T)^1.261 + 4.6151);
h = p_s0*(hr)*(psat/p_s0);
F_rO = 1/p_s0*(24 + 4.04*10^4*h*(0.02+h)/(0.391+h));
F_rN = 1/p_s0*(T_0/T)^(1/2)*( 9 + 280*h*exp(-4.17*((T_0/T)^(1/3)-1)) );
alpha_ps_10 = 100*F.^2./p_s0.*( 1.84*10^(-11)*(T/T_0)^(1/2) ...
+ (T/T_0)^(-5/2)*(0.01278*exp(-2239.1/T)./(F_rO + F.^2/F_rO) ...
+ 0.1068*exp(-3352/T)./(F_rN + F.^2/F_rN) ) );
alpha_ps_10 = alpha_ps_10*20/log(10);
hr = 20;
psat = p_s0*10^(-6.8346*(T_01/T)^1.261 + 4.6151);
h = p_s0*(hr)*(psat/p_s0);
F_rO = 1/p_s0*(24 + 4.04*10^4*h*(0.02+h)/(0.391+h));
F_rN = 1/p_s0*(T_0/T)^(1/2)*( 9 + 280*h*exp(-4.17*((T_0/T)^(1/3)-1)) );
alpha_ps_20 = 100*F.^2./p_s0.*( 1.84*10^(-11)*(T/T_0)^(1/2) ...
+ (T/T_0)^(-5/2)*(0.01278*exp(-2239.1/T)./(F_rO + F.^2/F_rO) ...
+ 0.1068*exp(-3352/T)./(F_rN + F.^2/F_rN) ) );
alpha_ps_20 = alpha_ps_20*20/log(10);
hr = 40;
psat = p_s0*10^(-6.8346*(T_01/T)^1.261 + 4.6151);
h = p_s0*(hr)*(psat/p_s0);
F_rO = 1/p_s0*(24 + 4.04*10^4*h*(0.02+h)/(0.391+h));
F_rN = 1/p_s0*(T_0/T)^(1/2)*( 9 + 280*h*exp(-4.17*((T_0/T)^(1/3)-1)) );
alpha_ps_40 = 100*F.^2./p_s0.*( 1.84*10^(-11)*(T/T_0)^(1/2) ...
+ (T/T_0)^(-5/2)*(0.01278*exp(-2239.1/T)./(F_rO + F.^2/F_rO) ...
+ 0.1068*exp(-3352/T)./(F_rN + F.^2/F_rN) ) );
alpha_ps_40 = alpha_ps_40*20/log(10);
hr = 60;
psat = p_s0*10^(-6.8346*(T_01/T)^1.261 + 4.6151);
h = p_s0*(hr)*(psat/p_s0);
F_rO = 1/p_s0*(24 + 4.04*10^4*h*(0.02+h)/(0.391+h));
F_rN = 1/p_s0*(T_0/T)^(1/2)*( 9 + 280*h*exp(-4.17*((T_0/T)^(1/3)-1)) );
alpha_ps_60 = 100*F.^2./p_s0.*( 1.84*10^(-11)*(T/T_0)^(1/2) ...
+ (T/T_0)^(-5/2)*(0.01278*exp(-2239.1/T)./(F_rO + F.^2/F_rO) ...
+ 0.1068*exp(-3352/T)./(F_rN + F.^2/F_rN) ) );
alpha_ps_60 = alpha_ps_60*20/log(10);
hr = 80;
psat = p_s0*10^(-6.8346*(T_01/T)^1.261 + 4.6151);
h = p_s0*(hr)*(psat/p_s0);
F_rO = 1/p_s0*(24 + 4.04*10^4*h*(0.02+h)/(0.391+h));
F_rN = 1/p_s0*(T_0/T)^(1/2)*( 9 + 280*h*exp(-4.17*((T_0/T)^(1/3)-1)) );
alpha_ps_80 = 100*F.^2./p_s0.*( 1.84*10^(-11)*(T/T_0)^(1/2) ...
+ (T/T_0)^(-5/2)*(0.01278*exp(-2239.1/T)./(F_rO + F.^2/F_rO) ...
+ 0.1068*exp(-3352/T)./(F_rN + F.^2/F_rN) ) );
alpha_ps_80 = alpha_ps_80*20/log(10);
hr = 100;
psat = p_s0*10^(-6.8346*(T_01/T)^1.261 + 4.6151);
h = p_s0*(hr)*(psat/p_s0);
F_rO = 1/p_s0*(24 + 4.04*10^4*h*(0.02+h)/(0.391+h));
F_rN = 1/p_s0*(T_0/T)^(1/2)*( 9 + 280*h*exp(-4.17*((T_0/T)^(1/3)-1)) );
alpha_ps_100 = 100*F.^2./p_s0.*( 1.84*10^(-11)*(T/T_0)^(1/2) ...
+ (T/T_0)^(-5/2)*(0.01278*exp(-2239.1/T)./(F_rO + F.^2/F_rO)...
+ 0.1068*exp(-3352/T)./(F_rN + F.^2/F_rN) ) );
alpha_ps_100 = alpha_ps_100*20/log(10);
psvg = figure (1);
loglog(F,alpha_ps_0, F,alpha_ps_10, F,alpha_ps_20, F,alpha_ps_40,...
F,alpha_ps_60, F,alpha_ps_80, F,alpha_ps_100,'LineWidth',1);
xlabel({'f / p_s [Hz/atm]';'Frequency/pressure'},'FontSize',10,...
'FontWeight','normal','FontName','Arial');
ylabel('Absorption coefficient/pressure \alpha / p_s [dB/100 m atm]',...
'FontSize',10,'FontWeight','normal','FontName','Arial');
title({'Sound absorption coefficient per atmosphere for air at 20°C ';...
'according to relative humidity per atmosphere'},...
'FontSize',10,'FontWeight','normal','FontName','Arial')
hleg = legend(' 0',' 10',...
' 20',' 40',' 60',...
' 80',' 100');
v = get(hleg,'title');
set(v,'string',{'h_r / p_s [%/atm]'},...
'BackgroundColor', 'white','EdgeColor','white','HorizontalAlignment','center');
set(hleg,'Location','SouthEast','EdgeColor','black')
axis([1e1 1e6 1e-3 1e4]);
grid on;
set(gca,'gridlinestyle','-');
set(gca,'MinorGridLineStyle','-')
plot2svg('Absorption_coefficient.svg',psvg);
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| Date | |
| Source | Own work |
| Author | Yggmcgill |
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:54, 17 November 2010 | | 512 × 384 (75 KB) | Yggmcgill (talk | contribs) | {{Information |Description={{en|1='''References''' # Bass, Sutherland, Zuckerwar, {{note|AtmosphericabsorptionofsoundUpdate1990}} [http://dx.doi.org/10.1121/1.400176 ''Atmospheric absorption of sound: Update''], J. Acoust. Soc. Am. Volume 88, Issue 4, Oct |
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