Constant Input

2011 2 16
1 个回答
回答已采纳
2 次查看（30 天）

0 个投票

Im interested in puting an input of constant value of 1 for 5s into my simulink model, i.e at time t=0, value=1 and t=5, the value goes from 1 to 0 immediately.
Ive tried using 2 step function and also tried using the signal builder block but they did not give me the results i wanted because of the gradual decrease from 1 to 0 at the time near t=4.9 to t=5.
Is there any method or other blocks i can use to help me solve this?

请先登录，再回答此问题。

 采纳的回答

Andreas Goser
Andreas Goser 2011-2-16

1 个投票

I suppose the observation "gradual decrease" is just a misinterpretation. If you see this in the scope block, Simulink interpolates between (4.9,1) and (5.0,0), but for the simulation, there is something existing between 4.9s and 5.0s.
If you like to changes the vizualization, simply select a smaller step size. But IMHO - the technical constraints shall determine the step size, not the need for good looking.

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Tan Edwin
Tan Edwin 2011-2-16
im new to Simulink so not sure if im making any sense here.
1) i need the value to be 1 at t=5 instead of 0/t=4.95 to be 1 instead of a value between (0,1) 2) i need the total input value to be 5.
Which both are required for the next part of the simulation. with the 'gradual decrease', it actually affects my calculation in the later parts resulting some errors which propagates as i continue the simulation
Tan Edwin
Tan Edwin 2011-2-16
I think i beginning to understand what you are trying to explain. Is it because i actually used a fixed step solver for my simulation thats why i have this kind of problem?
Kaustubha Govind
Kaustubha Govind 2011-2-16
Yes, it is because of using a fixed-step solver (presumably with step size 0.1) that you see this issue. Try switching to a variable-step solver if you'd like the solver to automatically take smaller steps around the discontinuity.

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 General Applications 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by