Jump to content

LMIs in Control/pages/systemzeros through feedthrough

From Wikibooks, open books for an open world

Let's say we have a transfer function defined as a ratio of two polynomials: Zeros are the roots of N(s) (the numerator of the transfer function) obtained by setting and solving for s.The values of the poles and the zeros of a system determine whether the system is stable, and how well the system performs. Similarly, the system zeros are either real or appear in complex conjugate pairs. In the case of system zeros without feedthrough, we take the assumption that .


The System

[edit | edit source]

Consider a continuous-time LTI system, , with minimal statespace representation

The Data

[edit | edit source]

The matrices:

The LMI: System Zeros without feedthrough

[edit | edit source]

The transmission zeros of are the eigenvalues of , where . Therefore , is a minimum phase if and only if there exists , where such that

Conclusion:

[edit | edit source]

If P exists, it ensures non-minimum phase. Eigenvalues of NAM then gives the zeros of the system.

Implementation

[edit | edit source]

https://github.com/Ricky-10/coding107/blob/master/Systemzeroswithoutfeedthrough

[edit | edit source]

A list of references documenting and validating the LMI.

Return to Main Page:

[edit | edit source]