Step response of an undamped 1DOF model in Simulink is still damped

2 次查看（过去 30 天）
DFfd
DFfd 2020-5-19
评论： DFfd 2020-5-19
I tried to simulate a 1DOF mass spring model with asymmetrical spring with k=10^9 N/m for x>0 and k=5*10^8 N/m for x<0 (model attached with name "KnickFeder"). If step excitation is applied with initial condition x=0, without damping, the amplitude shall stay unchanged. However in the simulation result below is apparently damped.
I tried a simplified model with linear spring (model attached with name "LinearFeder"). The result is still damped, albeit to a less extent.
If I build the model with SimScape, the result is perfectly undamped.
The parameters of simulation are the same (0.1 ms time step, 2 s duration). Yet why the results are different?
  2 个评论
rubindan
rubindan 2020-5-19
Your system frequency is
You simulation is running at 10^4 Hz, and that is simply not enough. Decrease simulation sample-time and you should get correct reasults.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Simscape Multibody 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by