Different Answers from Matlab and Simulink

I have a script of matlab solving 2 double order dependant differential equation. Now I want to solve same in simulink, I have developed a model in simulink but it is not giving me correct graph. Kindly someone help me in debugging the model.

PFA for matlab and simulink code.

Th equations are:

dhdt = hdot

dhdotdt = (1/m/l)*(m*g*h + m/M*(-Kp.*h - Kd.*hdot - b.*xdot + m*g.*h))

dxdt = xdot

dxdotdt = (1/M)*(-Kp*h - Kd*hdot - b*xdot + m*g*h)

Answer 1

[Raunak Gupta]

Hi,

From the files I can see there is a difference while you plot both the outputs. In the MATLAB file x is plotted correctly as in Simulink file. The h is plotted as it is Simulink whereas it is multiplied by 180/pi while plotting in MATLAB. Since you scaled the h value in .m file, the tilt on x is not visible due to small value. You can maybe remove the scaling from MATLAB Script or add the scaling as a gain block in Simulink to match the results.