Different Answers from Matlab and Simulink

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Mrudul Agrawal
Mrudul Agrawal 2020년 11월 5일
답변: Raunak Gupta 2020년 11월 10일
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)

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Raunak Gupta
Raunak Gupta 2020년 11월 10일
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.

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