How to write this equation into code?

2018 5 4
1 个回答
更新时间：2018 5 5
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I currently have it in this form and I am getting a weird answer:
eqn3 = ((Ac*Pul)/(alpha*CF*miu))*((((Rm*Ac)/(alpha*CF))^2)+(((2*Ac)/(alpha*CF))*((Rm*Vcf)+((alpha*CF*(Vcf^2))/(2*Ac))+((Ac*Pul*(t-tcf))/miu))))^-(1/2) == Vt2;

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回答（1 个）

KSSV
KSSV 2018-5-4

0 个投票

When you have such a complex equation......it is confusing to type whole equation at once......try to type term by term and then see the answer.
T1 = Ac*Pul/(alpha*CF*mu) ;
T2 = (Rm*Ac/(alpha*CF))^2 ;
T3 = (2*Ac/(alpha*CF))*(Rm*VCF+(alpha*VCF^2)/(2*Ac)+(Ac*Pul*(t-tCF)/mu)) ;
J = T1*(T2+T3)^(-1/2) ;

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Bryan Lee
Bryan Lee 2018-5-4
Thank you for your input. I tried this and it did not work. It is still giving me a strange answer. Would you like me to give you the values of the constants?
Image Analyst
Image Analyst 2018-5-4
We can't do much else until you do. The formula looks correct. Give values for all the variable, and your expected answer that is known to be correct.
Bryan Lee
Bryan Lee 2018-5-4
编辑：Walter Roberson 2018-5-5
the equation is set equal to Vt2, and I am solving for the variable 't'. The expected value of t is 2925.24, but I am getting 725764499.359.
CF = 4.5; % kg/m^3
Ac = 0.0018; % m^2
Vt1 = (1e-5)/60; % m^3/s
P0 = 2068.43; % Pa
Pul = 172368.93233; % Pa
miu = 1e-3; % Pa?s
alpha = 3.8e12; % m/kg
Rm = 22339043999.99; % m^-1
tcf = 1161.628; % s
Vcf = 0.0001936; % m^3
Vt2 = 8.333e-08; % m^3

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