CRASH VICTIM SIMULATION WITH MADYMO, VALIDATION OF IMPACT SLED TESTS AND PARAMETER STUDY

KROCKSIMULERING MED MADYMO: VALIDERING AV SLAEDSERIE OCH PARAMETERSTUDIE

The aim has been to study crash victims. In order to do so a three dimensional crash model has been set up in the occupant simulation program MADYMO. The model has been validated by comparing predictions of the model with results of impact sled tests. The parameters that were used in the MADYMO model were: 1) Hybrid II dummy from MADYMO data base; 2) Crash pulse (15.6 m/s, 35 mph frontal crash test); 3) Passenger compartment geometry; 4) Safety belt properties; 5) Retractor properties; 6) Seat properties; 7) Anti-submarining system properties; and 8) Firewall properties. Good agreement between the predictions and the experimental results were generally obtained. In the validated MADYMO model mathematically simulated crash pulses for crashes at 4.6-, 8.9-, and 13.4 m/s (10-, 20-, and 30 mph) were used. The acceleration curves for the crashes at the different speeds showed the same shape. The curves only differed by the levels. This is also the case for the forces. A statistical experimental design was carried out where the following were varied: A) Belt stiffness properties; B) Belt geometry; C) Belt application points to the dummy's lap (pelvis ellipsoid); D) Seat force/deformation properties; E) Seat friction coefficient; F) Seat damping coefficient; and G) Anti-submarining system properties. The studied result parameters were: A. Pelvis acceleration duration B. Pelvis acceleration maximum C. Head displacement maximum D. Lap belt forces maximum E. Diagonal belt forces maximum. The belt's lap application point to the pelvis ellipsoid was shown to be the factor that most influenced the duration of the pelvis acceleration. The maximum acceleration of the pelvis was shown to be most influenced by the properties of the antisubmarining system and the seat. The belt properties influenced the maximum head displacement and the beltforces. A minor study was performed to see how the belt stretch over the dummy's chest influenced the acceleration and the belt forces. The ideal application point to the chest ellipsoid of the diagonal belt proved to be far out on the shoulder and far out to the side of the ribcage.

• Corporate Authors:

  Chalmers Tekniska Hoegskola

  Institutionen foer Personskadeprevention, Fack
  Goeteborg,   Sweden 
• Authors:
  • Pipkorn, B
• Publication Date: 1989

Language

• Swedish

Media Info

• Pagination: v.p.
• Serial:
  • CTH Personskadeprevention Examensarbete
  • Publisher: Chalmers Tekniska Hoegskola

Subject/Index Terms

• TRT Terms: Computer programs; Crash tests; Head; Hip; Impact sleds; Information processing; Manual safety belts; Seats; Simulation; Vehicle occupants
• Subject Areas: Passenger Transportation; Research;

Filing Info

• Accession Number: 00605815
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: 1989:4
• Files: ITRD, TRIS
• Created Date: Mar 31 1991 12:00AM