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Understanding Lower Leg Injury in Offset Frontal Crash: A Multivariate Analysis
KTH, School of Technology and Health (STH).
KTH, School of Technology and Health (STH).
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Förståelse av Underbensskador i Frontalkrockar : En Multivariat Analys (Swedish)
Abstract [en]

Lower leg injury is an important issue in frontal car crash. Although safety in cars has been

improved by developments such as seat belts and airbags, lower leg injuries have not been

reduced. These injuries are not life threatening but can result in long term disability and cost a

lot to society. This study focused on the passenger occupant in offset frontal crashes and aimed

at understanding and finding ways to reduce the injury criteria for the lower leg: tibia index. A

finite element model was simplified to introduce parameters which influence on tibia index was

investigated with a multivariate analysis. The model simplification consisted in removing

irrelevant parts and replacing other parts by simple foam blocks. More than 1300 simulations

were run with different parameter values. The results were then analysed by calculating

correlations and effects of the parameters on tibia index. It was concluded that the presence of

a knee bolster decreased tibia index. The results also showed a decrease of tibia index when the

toe pan was angled towards the legs of the passenger. Moreover, a correlation between tibia

index and the movement of the feet during the crash was found. It was concluded that restrained

lower legs also presented decreased tibia indices compared to unrestrained ones. Most of the

results proved to be also valid on the initial, unsimplified finite element model.

Abstract [sv]

Underbensskador är ofta förekommande vid frontalkrock. Även om fordonssäkerheten har

förbättrats i och med utveckling av bland annat säkerhetsbälte och krockkudde, har antalet

underbensskador inte minskat. Denna typ av skada är inte livshotande men kan resultera i

långvariga besvär och kan leda till stora kostnader för samhället. Detta examensarbete fokuserar

på passageraren vid frontalkrock (offset) och syftet var att skapa förståelse kring skadekriteriet

för underben: tibia index, samt hitta lösningar på hur tibia index kan minskas. En finit

elementmodell förenklades och parametrar introducerades. Parametrarnas påverkan på tibia

index undersöktes med en multivariat analys. Modellen förenklades genom att eliminera några

delar och ersätta andra delar med enkla block. Simuleringar med olika värden på parametrarna

skapades och ungefär 1300 kördes. Värdena från simuleringarna analyserades genom att

beräkna korrelation och effekt på tibia index. Resultaten visade att implementering av ett slags

mjukt knäskydd påverkar tibia index positivt. De visade också att tibia index förbättrades när

den främre delen av golvet vinklades mot passagerarens ben. Vidare, fanns en korrelation

mellan tibia index och fötternas förflyttning under krockförloppet. Slutsatsen var att

kontrollerade underben förbättrar tibia index i jämförelse med okontrollerade ben. De flesta

resultaten stämde även för den ursprungliga modellen.

Place, publisher, year, edition, pages
2015. , 74 p.
Series
TRITA-STH, 2015:076
Keyword [en]
Lower leg injury, Tibia index, Offset frontal crash, FEM simulations, Multivariate
Keyword [sv]
Underbensskador, Tibia index, Frontalkrock, FEM-simuleringar, Multivariat
National Category
Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-171048OAI: oai:DiVA.org:kth-171048DiVA: diva2:841528
External cooperation
Volvo Cars Safety Centre
Subject / course
Medical Engineering
Educational program
Master of Science - Medical Engineering
Supervisors
Examiners
Available from: 2015-08-12 Created: 2015-07-13 Last updated: 2015-08-12Bibliographically approved

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