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Study of Vehicle-to-Pedestrian Interactions with FEM – Evaluation of Upper Leg Test Methods using a Human Body Model
KTH, School of Technology and Health (STH).
KTH, School of Technology and Health (STH).
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Studie av Fotgängarkollisioner med FEM – Utvärdering av Testmetoder för Lårben/Höft med en Humanmodell (Swedish)
Abstract [en]

The European New Car Assessment Programme (Euro NCAP) performs several different tests to evaluate vehicles and rate their safety. Some of these tests are subsystem tests made to mimic different body parts of a pedestrian in an interaction with a vehicle. However, some criticism to the test method for the upper leg has been presented, stating that there is a discrepancy between this test method and a real-life interaction. Therefore, a modified test method for the upper leg has been proposed.

The aim of this thesis was to evaluate the upper leg test method used today by Euro NCAP, and compare it with the proposed modified test method as well as to computer simulations with a Human Body Model (HBM). The evaluation was performed by comparing different parameters obtained in the two test methods. These have also been compared to computer simulations using a HBM in interaction with a passenger vehicle model.

Prior to the evaluation of the test methods, the HBM was positioned into different stances to mimic postures in the human walking cycle. The vehicle model was positioned at four different heights, and three different impact points along the bonnet were used. The results showed that the different methods had their own advantages for some parameters. However, no general conclusion of which method showed the closest correlation to the HBM reference simulations could be determined.

Abstract [sv]

European New Car Assessment Programme (Euro NCAP) utför flera olika tester för att utvärdera fordon och betygsätta deras säkerhet. Några av dessa tester sker med delsystem skapade för att efterlikna olika kroppsdelar hos en fotgängare i en kollision med ett fordon. Viss kritik har dock riktats mot testmetoden för lårben och höft, då studier visat att det finns en skillnad mellan testmetoden och en verklig kollision. En modifierad testmetod för lårbenet och höften har därför föreslagits.

Syftet med detta examensarbete har varit att utvärdera testmetoden för lårben och höft, som idag används av Euro NCAP, och jämföra den med den föreslagna modifierade testmetoden men även datorsimuleringar med en humanmodell. Utvärderingen har genomförts genom att jämföra olika parametrar som erhållits från de två testmetoderna. Dessa parametrar har även jämförts med datorsimuleringar av fotgängarkollisioner med en humanmodell och en bilmodell.

Humanmodellen positionerades i olika kroppsställningar innan utvärderingen av testmetoderna genomfördes. Detta för att efterlikna verkliga positioner i en mänsklig gångcykel. Bilmodellen positionerades vid fyra olika höjder och tre träffpunkter längs motorhuven användes. Resultaten visade att båda metoderna hade fördelar gentemot varandra för vissa parametrar. Ingen generell slutsats kunde dock dras om vilken metod som visade närmast korrelation till referenssimuleringarna med humanmodellen.

Place, publisher, year, edition, pages
2013. , 65 p.
Series
Trita-STH, 2013:81
Keyword [en]
FEM Simulations, Human Body Model, THUMS, Euro NCAP, Upper Leg Test Methods, Positioning, Vehicle-to-Pedestrian Interactions, Impactor, Subsystem Testing
Keyword [sv]
FEM-simuleringar, Humanmodell, THUMS, Euro NCAP, Testmetoder för Lårben/Höft, Positionering, Fotgängarkollisioner, Impaktorer, Test med Delsystem
National Category
Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-123953OAI: oai:DiVA.org:kth-123953DiVA: diva2:631278
External cooperation
Volvo Cars Safety Centre
Subject / course
Medical Engineering
Educational program
Master of Science in Engineering - Medical Engineering
Presentation
2013-06-13, FL-3-221, Alfred Nobels Allé 10, 141 86 Flemingsberg, 13:30 (English)
Supervisors
Examiners
Available from: 2013-08-28 Created: 2013-06-20 Last updated: 2013-08-28Bibliographically approved

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