LMIs in Control/pages/LMI for Schur Stabilization
LMIs in Control/pages/LMI for Schur Stabilization
The System[edit | edit source]
We consider the following system:
where , are the state vector and the input vector, respectively. Moreover, the state feedback control law is defined as follows:
Thus, the closed-loop system is given by:
The Data[edit | edit source]
The Optimization Problem[edit | edit source]
Find a matrix such that,
According to the definition of the spectral norms of matrices, this condition becomes equivalent to:
One can use the Lemma 1.2 in [1] page 14, the aforementioned inequality can be converted into:
The LMI: LMI for Schur stabilization[edit | edit source]
Title and mathematical description of the LMI formulation.
Conclusion:[edit | edit source]
This problem is a special case of Intensive Disk Region Design (page 230 in [1]). This problem may not have a solution even when the system is stabilizable. In other words, once there exists a solution, the solution is robust in the sense that when there are parameter perturbations, the closed-loop system's eigenvalues are not easy to go outside of a circle region within the unit circle [1].
Implementation[edit | edit source]
A link to Matlab codes for this problem in the Github repository:
https://github.com/asalimil/LMI-for-Schur-Stability
Related LMIs[edit | edit source]
External Links[edit | edit source]
A list of references documenting and validating the LMI.
- [1] - LMI in Control Systems Analysis, Design and Applications