Different time response of same trasfer function in matlab and simulink
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I am modeling the mechanical component of an accelerometer and tf is MechCmp =
4.313e-09
---------------------------------
4.313e-09 s^2 + 0.05545 s + 149.9
when i use step(MechCmp) i get this response
but when i give step ip to its Simulink tf block of the exact same values it takes much time and gives a straight line as o/p. I also tried LTI block and state space model of the same tf but problem is same.i found answers saying that simulink uses ode solvers instead of fixed sample time, can anyone explain to me how to do disable ode solvers or use fixed sample time in simulink. or anyother suggestion
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채택된 답변
Dimitris Kalogiros
2018년 8월 9일
Then you can change your solver:
I suggest " variable-step discrete " solver
추가 답변 (1개)
Ameer Hamza
2018년 8월 9일
The Simulink is giving the same plot as MATLAB, the problem in the display is happening because The system step response has a very small magnitude (approx 2.9e-11) and the settling time is also very small (approx 2e-3 seconds). You need to scale the scope axis properly, to see the same graph. Change the Simulation Stop time to 0.01 seconds and scale the axis using the button shown in the red box
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Ameer Hamza
2018년 8월 10일
편집: Ameer Hamza
2018년 8월 10일
I am using R2018a. Please try to run the attached file to see if it work correctly.
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