Conference article

How to Shape Noise Spectra for Continuous System Simulation

Andreas Klöckner
DLR German Aerospace Center, Institute of System Dynamics and Control, Weßling, Germany,

Andreas Knoblach
DLR German Aerospace Center, Institute of System Dynamics and Control, Weßling, Germany,

Andreas Heckmann
DLR German Aerospace Center, Institute of System Dynamics and Control, Weßling, Germany,

Download articlehttp://dx.doi.org/10.3384/ecp15118411

Published in: Proceedings of the 11th International Modelica Conference, Versailles, France, September 21-23, 2015

Linköping Electronic Conference Proceedings 118:44, s. 411-418

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Published: 2015-09-18

ISBN: 978-91-7685-955-1

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

Noise for continuous-time system simulation is relevant for many applications, where time-domain results are required. Simulating such noise raises the need to consistently shape the frequency content of the signal. However, the methods for this task are not obvious and often state space implementations of form filters are approximated. In this paper, we address the problem with a new method relying on directly using the specified power spectral density for a convolution filter. For the example of railway track irregularities, we explain how to derive the required filters, implement them in the open-source Noise library, and verify the results. The new method produces correct results, is very simple to use, and enables new features for time simulation of physical systems.

Keywords

Noise; power spectral density; track irregularity

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