Find out timing parameters like rise time, settling time, time constant etc..

I have doveloved a simulink model for a system. I gave step input to the system and plotted response in scope. no i have to find out the parmeters of this like rise time, settling time, delay time, time constant, steady state error etc. from the scope diagram. how can i do that?

Answer 1

[Renato SL]

If I want to do everything in MATLAB, I would add a branch from the output of the system to a To Workspace block. After that, although I have never used this function, you could do stepinfo (documentation here) and it should present you most of what you are looking for.

I prefer to do it manually, though. In the Scope, I would use Cursor Measurements and get the information on the amplitude and time that I need. If I remember correctly, the theory should cover the definition of rise time, time constant, etc.

[Nagarjuna Arjun]

thank you for response. I have multi input and multi output system. i have developed simulation for this system. for this MIMO how can i findout time parameters.

[Renato SL]

I have only done the analysis for SISO system, so at the time I only had to check the one output I have.

If the system is MIMO and all output is the actual output of the system (output as in there is Y1, Y2, Y3, etc and not Y1, Y1', Y1'') then I think the value for rise time, time constant, maximum overshoot, etc for each output should be checked.

I'm sorry if I use confusing terms as I have not discussed this topic in a long time.