I have to solve the following system of differential equations in Simulink. I have attached what I have done. I think there must be something wrong with the block diagram that I built, but I cannot figure out what. The independent variable is the time. ms, mu, cs, ks, ku, cu are constants. y is the road which I gave to the Simulink model as input using 1-D LookUp Table block.
From which:
It is a 2-DOF system coressponding to a vehicle. It has been obtained using the laws of motion.
I cannot figure what it is wrong with the diagram I created. Below is an example of why I am saying this. In the left picture is the kind of graph for SWS I would like to obain. In the right picture is what I actually get. It looks like, at the beginning, the SWS I obtain is ok, but afterwards, it is constanlty very close to 0, and it is not oscillating anymore like in the right picture. I guess there might be something wrong with input road (the y - 1DLookUpTable). Note, also, that the range is completely different. In the left image i goet values up to 300, while in the right image I get values of 10 to the power of -4.
