State-space model identification for component synthesis
Övrigt konferensbidrag, 2007

A scheme for synthesis of subsystem state-space models to be used for analysis of dynamic behavior of built-up linear structures is presented. Using measurements on each component, subsystem models are identified adopting contemporary system identification methods. The subsystem state-space models are transformed into a coupling form, at which kinematic constraints and equilibrium conditions for the interfaces are introduced. The procedure is applied to a plane frame structure, which is built up of two components. It is found that the non-trivial model order determination constitutes a crucial step in the system identification process. If the model order is incorrect at subsystem level, the synthesized model may radically fail to describe the properties of the built-up structure. Furthermore, we use subsystem models that satisfy certain physically motivated constraints, e.g. reciprocity and passivity. Different approaches and methods to aid the model order determination and the estimation of physically consistent state-space models at subsystem level are discussed.


Per Sjövall


Thomas Abrahamsson


Proceedings of the 25th International Modal Analysis Conference (IMAC-XXV), February 19-22, Orlando, Florida, USA

0-912053-96-8 (ISBN)



Annan materialteknik



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