Experimental Design and Updating of Finite Element Models

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Sökning: WFRF:(Ljung Magnus) > Experimental Design...

Andersson, MagnusLinköpings universitet,Reglerteknik,Tekniska högskolan (författare)

Experimental Design and Updating of Finite Element Models

BokEngelska1997

Förlag, utgivningsår, omfång ...

Linköping :Linköping University Electronic Press,1997
134 s.
printrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:liu-98110
ISBN:9178719283
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98110URI

Kompletterande språkuppgifter

Språk:engelska
Sammanfattning på:engelska

Ingår i deldatabas

SwePubSwePub

Klassifikation

Ämneskategori:vet swepub-contenttype
Ämneskategori:lic swepub-publicationtype

Serie

Linköping Studies in Science and Technology. Thesis,0280-7971 ;611

Anmärkningar

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.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

Ljung, Lennart,ProfessorLinköpings universitet,Reglerteknik,Tekniska högskolan(Swepub:liu)lenlj48 (preses)
Linköpings universitetReglerteknik (creator_code:org_t)

Internetlänk

https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98110

Hitta via bibliotek

Experimental Design and Updating of Finite Element Models (Sök publikationen i LIBRIS)

Till lärosätets databas

Hitta mer i SwePub

Av författaren/redakt...: Andersson, Magnu ...; Ljung, Lennart, ...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Elektroteknik oc ...; och Reglerteknik

Delar i serien: Linköping Studie ...

Av lärosätet: Linköpings universitet

Sök utanför SwePub

Sök vidare i:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se