How to get different values of Wbar, Fbar and fbar for different values of r and psi like for psi = [0.0, 0.0001] and similarly for 'r'.

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AVINASH SAHU 2022-5-17

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评论： Dyuman Joshi 2023-9-22

k = 1:21;

Hbar=0.04; % A:Length of bearing, H:Bearing wall thickness, Hbar = H/A

r= 1.7773; % Film thickness ratio

psi=0.0; % Permeability parameter

calpha = ((k.^2).*(pi^2).*(1+r+r.^2+r.^3))+3*(1-r-r.^2+r.^3);

y = 1./((k.^2).*((48.*k.*pi.*psi.*tanh(k.*pi*Hbar))+(Hbar*calpha)));

x = 192*0.04*(r-1)/pi^2;

Wbar = x*sum(y) % Dimensionless load capacity

z = log(r)/(r-1);

t = 96*0.04*(r-1)^2/pi^2;

Fbar = z+t*sum(y) % Dimensionless friction drag exerted by a moving slider

fbar = Fbar/Wbar % Coefficient of friction

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Dyuman Joshi 2023-9-22

Look into Vectorization - https://in.mathworks.com/help/matlab/matlab_prog/vectorization.html

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回答（1 个）

Balavignesh 2023-9-22

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Hi Avinash,

I understand that you want to get different values of the result variables ("Wbar”, "Fbar", "fbar”) for different values of “psi” and “r”. You can store the required values of “psi” and “r” you want to experiment in two different arrays. You can then initialize three different result arrays “Wbar”, “Fbar”, “fbar” and use a “for” loop to update the result arrays for different values of “psi” and “r”. The following code snippet may help you achieve this:

r= [1.7773 , 1.234 , 1.678];  % Film thickness ratio
psi= [0.0 , 0.001 , 0.002] ;% Permeability parameter
Wbar = []; %initalizing a result array 
for i = 1:3
    calpha = ((k.^2).*(pi^2).*(1+r(i)+r(i).^2+r(i).^3))+3*(1-r(i)-r(i).^2+r(i).^3);
    y = 1./((k.^2).*((48.*k.*pi.*psi(i).*tanh(k.*pi*Hbar))+(Hbar*calpha)));
    x = 192*0.04*(r(i)-1)/pi^2;
    
    Wbar(i) = x*sum(y) % updating each index of result array using for loop  
end

You can refer to the Mathworks Documentation link below to get more information about "for" loops:

for loop to repeat specified number of times - MATLAB for - MathWorks India

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