Experimental Design and Updating of Finite Element Models

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Fältnamn	Indikatorer	Metadata
000		03449nam a2200289 4500
001		oai:DiVA.org:liu-98110
003		SwePub
008		130930s1997 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
020		a 9178719283q print
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-981102 URI
040		a (SwePub)liu
041		a engb eng
042		9 SwePub
072	7	a vet2 swepub-contenttype
072	7	a lic2 swepub-publicationtype
100	1	a Andersson, Magnusu Linköpings universitet,Reglerteknik,Tekniska högskolan4 aut
245	1 0	a Experimental Design and Updating of Finite Element Models
264	1	a Linköping :b Linköping University Electronic Press,c 1997
300		a 134 s.
338		a print2 rdacarrier
490	0	a Linköping Studies in Science and Technology. Thesis,x 0280-7971 ;v 611
520		a This thesis deals with two partly related topics: model updating and actuator/sensor placement concerning finite element (FE) models of large, flexible mechanical structures.The importance of accurate dynamical FE models of mechanical structures in, e.g., aviation/aerospace applications are steadily increasing. For instance, a sufficient accurate model may reduce the expenses for ground vibration testing and wind-tunnel experiments substantially. It is therefore of high industrial interest to obtain accurate models of flexible structures. One approach is to improve a parameterized, initial FE model using measurements of the real structure, so-called model updating. For a fast, successful model updating, three requirements must be fulfilled. The model updating must be computationally cheap, which requires an efficient model reduction technique. The cost function describing the deviation between the model output and the measurements must have good convexity properties so that an estimation of the parameters corresponding to the global optimum is likely to be obtained. Finally, the optimization methods must be reliable. A novel mode-pairing free cost function is presented, and together with a proposed general procedure for model updating, a cheap model updating formulation with good parameter estimation properties is obtained.Actuator and sensor placement is a part of the experimental design. It is performed in advance of the vibrational experiment in order to ensure high quality measurements. Using a nominal FE model of the structure, an actuator/sensor placement can be made. Actuator/sensor placement tasks are generally discrete, non-convex optimization problems of high complexity. One is therefore restricted to the use of sub-optimal algorithms in order to fulfill time and memory storage requirements. A computationally cheap algorithm for general actuator/sensor placement objectives are proposed. A generalization of an actuator/sensor placement criterion for model updating, and a novel noise-robust actuator placement criterion for experimental modal analysis are proposed.
650	7	a TEKNIK OCH TEKNOLOGIERx Elektroteknik och elektronikx Reglerteknik0 (SwePub)202022 hsv//swe
650	7	a ENGINEERING AND TECHNOLOGYx Electrical Engineering, Electronic Engineering, Information Engineeringx Control Engineering0 (SwePub)202022 hsv//eng
700	1	a Ljung, Lennart,c Professoru Linköpings universitet,Reglerteknik,Tekniska högskolan4 ths0 (Swepub:liu)lenlj48
710	2	a Linköpings universitetb Reglerteknik4 org
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98110

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