Difference between revisions of "Emgr"

Revision as of 16:34, 10 October 2017

Synopsis

emgr - Empirical Gramian Framework (Version 5.2). Empirical gramians can be computed for linear and nonlinear control systems for purposes of model order reduction, uncertainty quantification and system identification. Model reduction using empirical gramians can be applied to the state space, to the parameter space or to both through combined reduction. The emgr framework is a compact open source toolbox for gramian-based model reduction and compatible with OCTAVE and MATLAB.

Features

Application matrix for the empirical gramian framework

emgr encompasses seven types of gramians:

Empirical Controllability Gramian
Empirical Observability Gramian
Empirical Cross Gramian (including an Empirical Non-Symmetric Cross Gramian)
Empirical Linear Cross Gramian
Empirical Sensitivity Gramian
Empirical Identifiability Gramian
Empirical Joint Gramian

emgr 5.2 overview

applicable to:

Linear + Nonlinear Control Systems
First + Second Order Control Systems
Parametrized | Parametric Systems
Time Invariant + Varying Systems
Discretized PDEs

and with sample code for:

Balanced Truncation + Direct Trunction (Approximate Balancing)
Parameter Identification + Sensitivity Analysis
Parameter Reduction + Robust Reduction
Combined State and Parameter Reduction
Decentralized Control
Nonlinearity Quantification

References

C. Himpe, M. Ohlberger. "A Unified Software Framework for Empirical Gramians". Journal of Mathematics, vol. 2013:1--6, 2013.

C. Himpe, M. Ohlberger. "Cross-Gramian Based Combined State and Parameter Reduction for Large-Scale Control Systems". Mathematical Problems in Engineering, vol. 2014:1--13, 2014.

C. Himpe, M. Ohlberger. "Model Reduction for Complex Hyperbolic Networks". Proceedings of the ECC'14: 2739--2743, 2014.

C. Himpe, M. Ohlberger. "A note on the cross gramian for non-symmetric systems". System Science and Control Engineering 4(1): 199--208, 2016.

C. Himpe. "Combined State and Parameter Reduction for Nonlinear Systems with an Application in Neuroscience". Westfälische Wilhelms Universität, Sierke Verlag Göttingen, 2017.

Links

Official website: http://gramian.de

Meta Information: INI code-metadata

Oberwolfach References on Mathematical Software: Entry

Contact

Christian Himpe

@@ Line 1: / Line 1: @@
 [[Category:Software]]
+[[Category:MATLAB]]
+[[File:Emgr_box.png|100px|right|emgr box]]
 == Synopsis ==
@@ Line 20: / Line 23: @@
 * Empirical Identifiability Gramian
 * Empirical Joint Gramian
+[[File:Emgr_flyer_2017.pdf|thumb|right|emgr 5.2 overview]]
 applicable to:
@@ Line 26: / Line 31: @@
 * First + Second Order Control Systems
 * Parametrized | Parametric Systems
-* Time Inavriant + Varying Systems
+* Time Invariant + Varying Systems
 * Discretized [[:Wikipedia:Partial_differential_equation|PDEs]]
@@ Line 47: / Line 52: @@
 * [[User:Himpe|C. Himpe]], M. Ohlberger. "<span class="plainlinks">[http://doi.org/10.1080/21642583.2016.1215273 A note on the cross gramian for non-symmetric systems]</span>".  System Science and Control Engineering 4(1): 199--208, 2016.
+* [[User:Himpe|C. Himpe]]. "<span class="plainlinks">[http://doi.org/10.14626/9783868448818 Combined State and Parameter Reduction for Nonlinear Systems with an Application in Neuroscience]</span>". Westfälische Wilhelms Universität, Sierke Verlag Göttingen, 2017.
 == Links ==