MORLAB

MORLAB, the Model Order Reduction LABoratory toolbox, is a collection of MATLAB and Octave routines for model order reduction of dense linear time-invariant continuous-time systems. The toolbox contains model reduction methods for standard, descriptor and second-order systems based on the solution of matrix equations. Therefore, also spectral projection based methods for the solution of the corresponding matrix equations are included.

Features

The following main features are provided in the latest release of the software (version 5.0):

Model reduction methods:

• for continuous-time standard and descriptor systems (MT, BT, FLBT, BST, LQGBT, PRBT, BRBT, HINFBT, TLBT, HNA)
• for discrete-time standard and descriptor systems (MT, BT, LQGBT)
• for continuous-time second-order systems (SOBT, SOFLBT, SOTLBT)

Matrix equation solvers:

• Matrix sign function based solvers for continuous-time algebraic Lyapunov, Sylvester, Bernoulli and Riccati equations
• Newton type solvers for continuous-time and discrete-time algebraic Riccati equations
• Smith iteration based solvers for discrete-time algebraic Lyapunov and Sylvester equations
• Structure-preserving doubling based solvers for discrete-time Riccati equations
• Riccati iteration-based solver for continuous-time algebraic Riccati equations with an indefinite quadratic term

Further methods:

• Routines for frequency and time evaluation and visualization
• Routines for the additive decomposition of transfer functions of linear systems
• Partial stabilization of linear systems
• Newton iteration to compute the matrix sign function
• Inverse-free iteration to compute the right matrix pencil disk function

References

• P. Benner, S. W. R. Werner, Balancing related model reduction with the MORLAB toolbox, Proc. Appl. Math. Mech. 18 (1) (2018) e201800083.
• P. Benner, S. W. R. Werner, Model reduction of descriptor systems with the MORLAB toolbox, IFAC-PapersOnLine 9th Vienna International Conference on Mathematical Modelling MATHMOD 2018, Vienna, Austria, 21--23 February 2018 51 (2) (2018) 547--552.
• P. Benner, S. W. R. Werner, MORLAB - Modellreduktion in MATLAB, in: T. Meurer, F. Woittennek (Eds.), Tagungsband GMA-FA 1.30 ’Modellierung, Identifikation und Simulation in der Automatisierungstechnik’ und GMA-FA 1.40 ’Theoretische Verfahren der Regelungstechnik’, Workshop in Anif, Salzburg, 18.-22.09.2017, 2017, pp. 508--517.
• P. Benner, A MATLAB repository for model reduction based on spectral projection, in: 2006 IEEE Conference on Computer Aided Control System Design, 2006 IEEE International Conference on Control Applications, 2006 IEEE International Symposium on Intelligent Control, 2006, pp. 19--24.
• P. Benner, E. S. Quintana-Ortı́, Model reduction based on spectral projection methods, in: P. Benner, V. Mehrmann, D. Sorensen (Eds.), Dimension Reduction of Large-Scale Systems, Vol. 45 of Lect. Notes Comput. Sci. Eng., Springer, Berlin/Heidelberg, Germany, 2005, pp. 5--45.

Links

• Official project website: https://www.mpi-magdeburg.mpg.de/projects/morlab
• Latest upload on Zenodo: https://zenodo.org/record/3332716

Contact

Steffen Werner