A Method for Efficient Flutter Analysis of Systems with Uncertain Modeling Parameters
A method for efficient analysis of variations in utter speed predictions caused by parameter variations in the mass, stiffness and aerodynamic models of a wing structure is presented. The analysis method considers a linear uncertainty formulation and performs a perturbation analysis based on computa...
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| Format: | Others |
| Language: | English |
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KTH, Optimeringslära och systemteori
2014
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| Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-143346 |
| Summary: | A method for efficient analysis of variations in utter speed predictions caused by parameter variations in the mass, stiffness and aerodynamic models of a wing structure is presented. The analysis method considers a linear uncertainty formulation and performs a perturbation analysis based on computation of eigenvalue differentials of a nominal system matrix. The method is applied in a test case study in which utter speed variations caused by variations in mass and aerodynamic properties of a delta wing model is analyzed. The report is concluded with a discussion of the validity of the results and of how the applicability of the method is affected by the assumptions on which it builds. === Enmetod för effektiv uppskattning av fladderhastigheten för system med osäkraparametrar i modellerna för massa, styvhet och aerodynamik presenteras. Metodenförutsätter en linjär osäkerhetsmodell och uppskattar den lägsta fladderhastighetsom kan orsakas av parametervariationerna genom en analys som bygger på differentieringav egenvärden. Metoden appliceras i en studie av en delta vinge där skillnaderi fladderhastighet orsakade av massvariationer och aerodynamiska osäkerheteranalyseras. Rapporten avslutas med en diskussion om resultaten från teststudienoch om hur applicerbarheten av metoden påverkas av de antaganden på vilka denbygger |
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