I have to use "fmincon" to solve the optimization problem for the fitting of an "Stress Relaxation" curve. My aim is to define the coefficient of the Prony Series (gamma_i & tau_i).

The problem is that i don’t know how to define my function and start the fitting in order to find e1,e2,e3 & tau1,tau2,tau3.

In Input i have the experimental data (stress relax) and time
fun= E0 * (1 – ( (e1*(1-exp(-t/tau1))) + (e2*(1-exp(-t/tau2))) + (e3*(1-exp(-t/tau3)))))I have to use "fmincon" to solve the optimization problem for the fitting of an "Stress Relaxation" curve. My aim is to define the coefficient of the Prony Series (gamma_i & tau_i).

The problem is that i don’t know how to define my function and start the fitting in order to find e1,e2,e3 & tau1,tau2,tau3.

In Input i have the experimental data (stress relax) and time
fun= E0 * (1 – ( (e1*(1-exp(-t/tau1))) + (e2*(1-exp(-t/tau2))) + (e3*(1-exp(-t/tau3))))) I have to use "fmincon" to solve the optimization problem for the fitting of an "Stress Relaxation" curve. My aim is to define the coefficient of the Prony Series (gamma_i & tau_i).

The problem is that i don’t know how to define my function and start the fitting in order to find e1,e2,e3 & tau1,tau2,tau3.

In Input i have the experimental data (stress relax) and time
fun= E0 * (1 – ( (e1*(1-exp(-t/tau1))) + (e2*(1-exp(-t/tau2))) + (e3*(1-exp(-t/tau3))))) fmincon, optimization, prony MATLAB Answers — New Questions

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