iam in the need of varying damper coefficient with respect to time in " Spring and Damper Force" block 
MATLAB: How to vary damper coefficient with respect to time in ” Spring and Damper Force” block
#dampercoefficient#secondergeneration#springmassdamper#varyingdampercofficientSimscapesimulink
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As far as I understood, in this specific case are exactly the same.
If you follow the Simulink block, you can write the equation of a simple mass-spring-damper system connected in a series like this (here is supposed m=1 for simplicity)
similarly, you can write the equation for any other nonlinear damper model. The 2nd order ODE is equivalent to the following system of first-order ODEs
Now you can write ode45 to solve this system
b1 = 1;b2 = 0.5;b3 = 0.1;b4 = 0.01;b5 = 0.001;k = 2;odeFun = @(t,y) [y(2); -b1*y(2)-sign(y(2))-b2*y(2)^2-b3*y(2)^3-sign(y(2))*b4*y(2)^4-b5*y(2)^5-k*y(1)];tspan = [0 5];ic = [1; 0];[t,y] = ode45(odeFun, tspan, ic);plot(t,y);
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