Modelica_LinearSystems2
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Latest release: Modelica_LinearSystems2 2.0 (released on 2009/09/02)
This is a new library. It is based on library Modelica_LinearSystems2 (version 0.95) but is not backwards compatible to this library due to many changes (e.g. the system data structures include strings for signals names whereas the 0.95 version does not have these names in the records).
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Project Description
Library Modelica_LinearSystems2 is a Modelica package providing different representations of linear, time invariant differential and difference equation systems. For example, record StateSpace defines a linear time invariant differential equation system in state space form:
der(x) = A * x + B * u
y = C * x + D * u
Operators are overloaded to work conveniently with these system descriptions in an interactive environment, e.g., to multiply transfer functions or to operate on complex numbers. About 180 functions are provided to operate on these data structures, e.g., to compute eigen values, zeros, step responses, to design pole-placement and LQG controllers, to plot step responses, frequency responses, eigen values, to convert between different description forms, or to generate a linear system description by linearization of a Modelica model.
Furthermore, in sublibrary Controller about 20 input/output blocks of linear systems are provided that are based on the different representation forms, e.g., PID, StateSpace, Filter blocks. A unique feature of these blocks is that it is very convenient to quickly switch between a continuous and a discrete block representation. Also, templates are provide to quickly built-up standard controller structures.
It is planned to include this library in a future version of the Modelica Standard Library. Note, the library is not backwards compatible to the previous beta version 0.95, called "Modelica_LinearSystems", which was shipped with previous versions of Dymola. Since the differences are too large, no conversion scripts are provided, but different library names are used.
Acknowledgement:
Partial financial support by BMBF (BMBF Förderkennzeichen: 01IS07022)
for this work with-in the ITEA2 project EUROSYSLIB
is highly appreciated.
