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State-space model identification for component synthesis

Per Sjövall (Institutionen för tillämpad mekanik, Dynamik) ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik)
Proceedings of the 25th International Modal Analysis Conference (IMAC-XXV), February 19-22, Orlando, Florida, USA (2007)
[Konferensbidrag, övrigt]

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.

Denna post skapades 2007-06-20. Senast ändrad 2007-06-20.
CPL Pubid: 43055


Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik


Optimeringslära, systemteori
Övrig teknisk mekanik

Chalmers infrastruktur