margin command on a system with transfer function on reference

2 次查看（过去 30 天）
montyynis
montyynis 2015-8-6
回答： Sriram Narayanan 2015-8-13
I have the following system (see picture). When calculating gain and phase margins with 'margin' command, should I consider L=GK to be an open loop transfer function (i.e. should I call margin(GK) )? If so, what difference does the transfer function H applied on the reference r make to gain and phase margins?

请先登录，再回答此问题。

采纳的回答

Sriram Narayanan
Sriram Narayanan 2015-8-13
It depends on what you are using the Transfer Function H for. H would typically be used as a prefilter or for feedforward control. So, it should not be shaping the crossover frequency and therefore, would not have an effect on the gain/phase margins. However, you should calculate gain/phase margins using the open-loop GK to meet desired robustness/disturbance rejection requirement and the prefilter H could help is adjusting the reference to meet reference tracking requirement.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Control Systems 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