This method can solve the problem.

Best regards.

This method can solve the problem.

Best regards.

Thank you very much for telling me the details.

Best regards.

Thank you very much for telling me the details.

Best regards.

@hirnyk Thank you very much.

@hirnyk Thank you very much.

@hirnyk 

By the way, when using 'rootlocus' command, why does some points exist in the figure? As the figure above,these points seems not the poles, and what are they?

Best regards.

@hirnyk 

By the way, when using 'rootlocus' command, why does some points exist in the figure? As the figure above,these points seems not the poles, and what are they?

Best regards.

Thank you very much. This 'RootLocusPlot' command is very useful, it even plots the asymptotic line in the figure, this is a feature some other sofeware isn't own, and it is very concise.

Best regards.

Thank you very much. This 'RootLocusPlot' command is very useful, it even plots the asymptotic line in the figure, this is a feature some other sofeware isn't own, and it is very concise.

Best regards.

Thank you very much. The command 'RootLocusPlot' in DynamicSystems package is the just command I'm longing for. It is very useful. It seem that transfer function must be proper, or a warning returned 'Warning, improper transfer-function, degree(num) > degree(den)', for example, sys := NewSystem(s^4*(1/(s*((1/5)*s+1)*((1/2)*s+1)))). Then I think the 'rootlocs' command in plots package is applied to all the rational function, because it can plot improper rational function. Does my thought right?

Best regards.

Thank you very much. The command 'RootLocusPlot' in DynamicSystems package is the just command I'm longing for. It is very useful. It seem that transfer function must be proper, or a warning returned 'Warning, improper transfer-function, degree(num) > degree(den)', for example, sys := NewSystem(s^4*(1/(s*((1/5)*s+1)*((1/2)*s+1)))). Then I think the 'rootlocs' command in plots package is applied to all the rational function, because it can plot improper rational function. Does my thought right?

Best regards.

@Kamel 

Thank you. By the way, can you tell me or give me a link about which input DynamicSystems accept or dont?

@Kamel 

Thank you. By the way, can you tell me or give me a link about which input DynamicSystems accept or dont?

Thank you very much. But when I run the model, the simulation failed. If I cut the line between sine souce and custom component, the component works very well.

From the equations, the component's input is sin(2*Pi*t). If I want the component's input is an undefined signal, namely, u(t),then how can I do this?   

Best regards.