Why does the output time of my transfer function not change dependant on the input

Hello,

I have modeled a system using a transfer function for a new and existing moving bogie system to evalue if the system can be improved for efficiency. When simulating in Matlab, the step response time remains the same irrepsective of the step input value, im not sure why this is happening. Can anyone explain?

the system transfer fucntion is

sys500000 = tf([6.1*10^-3], [1 0.02805 3.05*10^-3])
step((sys50000*0.5)*9025)

[Torsten]

Can anyone explain?

Without your code ? No.

[Mathieu NOE]

hello

yeap, with your code it could certainly help

the step response time remains the same irrepsective of the step input value

If your system is linear and time invariant , there is no reason why the response time ( time required to let the transient decay) would be dependant of the input signal amplitude

only the output signal amplitude will change , not the time it takes to decay

[Daniel]

@Torsten@Mathieu NOE i have edited the post to include the code

the system transfer function is step((sys50000*0.5)*9025)

[Sam Chak]

Hi @Daniel, your code does't fully work due to the missing item.

step((sys50000*0.5)*9025)

Unrecognized function or variable 'sys50000'.

[Daniel]

@Sam Chak apologise, update to include the real TF 'sys500000 = tf([6.1*10^-3], [1 0.02805 3.05*10^-3])'

[Paul]

What exactly is the meaning of "output time" or "step response time"? Perhaps you can show a code snippet that generates some plots that illustrate the question.

[Sam Chak]

Hi @Daniel

The following step response info has been extracted from the given transfer function. Please describe the problem based on these values and findings.

sys500000   = tf([6.1*10^-3], [1 0.02805 3.05*10^-3])

sys500000 =
 
           0.0061
  -------------------------
  s^2 + 0.02805 s + 0.00305
 
Continuous-time transfer function.

steadystate = dcgain(sys500000)

steadystate = 2

step((sys500000*0.5)*9025), grid on

●

stepinfo(sys500000*0.5)

ans = struct with fields:
         RiseTime: 23.0506
    TransientTime: 255.1193
     SettlingTime: 255.1193
      SettlingMin: 0.8080
      SettlingMax: 1.4382
        Overshoot: 43.8241
       Undershoot: 0
             Peak: 1.4382
         PeakTime: 59.1038