000022109 001__ 22109
000022109 005__ 20170622145957.0
000022109 04107 $$aeng
000022109 046__ $$k2015-05-25
000022109 100__ $$aPetersen, Øyvind W.
000022109 24500 $$aMODEL-BASED JOINT INPUT-STATE ESTIMATION ON A THIN-WALLED CANTILEVER BEAM

000022109 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022109 260__ $$bNational Technical University of Athens, 2015
000022109 506__ $$arestricted
000022109 520__ $$2eng$$aIn the field of structural dynamics, measuring external forces directly is often not feasible, whereas structural response data is far more accessible. Force identification is an inverse problem concerned with estimating forces using measured dynamic response. This paper presents a practical application of a joint input-state estimation algorithm. The algorithm gives minimum-variance unbiased estimates of states and input forces in a discrete-time linear system, where stochastic noise in the measurement data and model description are accommodated for. An experimental study of a thin-walled cantilever beam is presented to demonstrate joint input-state estimation. The finite element modelling is done in the software ABAQUS with shell elements. A modally reduced order model is created, containing 13 selected modes. We introduce the general approach of obtaining strain measurements in a modal format. A sensor network is designed from a discussion on optimal placement of accelerometers and strain gauges. It is also shown that the sensor network constitute a sufficient observational ensemble for estimation of states and forces. The studies demonstrate successful identification of forces generated by a simple mass-spring system. In addition, the strain is predicted at a location not co-located with the sensor network. The predicted strain agrees well with a reference strain measured at the same location. Lastly, we address some of the practical problems encountered and recommendations for further experiments.

000022109 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022109 653__ $$aForce identification, response estimation, sensor network

000022109 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022109 720__ $$aPetersen, Øyvind W.$$iNord, Torodd S.$$iØiseth, Ole
000022109 8560_ $$ffischerc@itam.cas.cz
000022109 8564_ $$s3040392$$uhttps://invenio.itam.cas.cz/record/22109/files/C1220.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022109 962__ $$r22030
000022109 980__ $$aPAPER