Simplified MADYMO Model of the IHRA Head-form Impactor

Sulzer, James; Kamalakkannan, Sarath Babu; Wiechel, John F.; Guenther, Dennis A.; Tanner, C. Brian; Morr, Douglas R.

doi:10.4271/2006-01-2349

Cited by 4 publications

(6 citation statements)

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“…21 In general, the rules indicate the characteristics of the dummies for crash evaluation, [36][37][38][39] or the impactor characteristics for the head and leg injury evaluation. [40][41][42] The teenager anthropomorphic model is defined a previous paper 1 as a derivation of the adult dummy representing the 50th percentile. The applied simulation method is a multibody technique; the most widely used programs are MADYMO, Aprosys and PC Crash, while Simpack is used in 12 and SimWise is effectively used in this paper, using the indirect approach.…”

Section: Introductionmentioning

confidence: 99%

Head, chest and femur injury in teenage pedestrian–SUV crash; mass influence on the speeds

Carollo

Mariotti

Naso

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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This work studies the teenage pedestrian-sport utility vehicle (SUV) crash; injury to the vital parts of the body, such as the head and chest, and to the femur is evaluated. More advanced injury criteria are applied, as provided in the rules. The multibody technique is applied by making use of SimWise software and of the teenager anthropomorphic model, the use of which is now consolidated. Head injury criterion (HIC) is used for the head, thoracic trauma index (TTI) criterion for the thorax in the case of side impact and 3 ms criterion in the case of frontal impact, while the force criterion is used for the femur. Both the TTI and femur load evaluation require non-substantial modifications of the dummy, by insertion of sensors for the measurement of the acceleration of the 4th rib and the 12th vertebra and two very thin plates at the knees for the correct individuation of the contact point with the vehicle bumper. Particular attention is paid to the front shape of the vehicle, concluding that the SUV examined in this paper is less dangerous than the sedan studied in a previous work, since its frontal dimensions (bonnet angle, bumper height and bonnet height) are more advantageous. However the teenage pedestrian in a lateral position is less prone to injuries in the head and chest, with respect to the frontal position; the pedestrian's position has little influence on femur damage. Furthermore, the braking of the vehicle reduces the possibility of crash fatality. In conclusion, a theoretical approach is shown, to highlight the influence of the vehicle mass on the pedestrian speed after the impact.

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Section: Introductionmentioning

confidence: 99%

Head, chest and femur injury in teenage pedestrian–SUV crash; mass influence on the speeds

Carollo

Mariotti

Naso

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…To validate the output of the model, the referent acceleration data from the head-drop test that was compared to the model output was taken from Sulzer et al ( 23 ). The acceleration profi le and the HIC score from the head-drop test, the model presented in Sulzer et al, and the model presented here were compared for a drop height of 376 mm, which corresponds to an impact velocity of 2.71 m z s 2 1 .…”

Section: Resultsmentioning

confidence: 99%

“…3 . Data for a higher input velocity case, 3.13 m z s 2 1 , were also compared against the model output ( 23 ). For this input velocity, the model shows a 2 4.7% error in peak acceleration and a 2 2.5% error in HIC.…”

Section: Resultsmentioning

confidence: 99%

“…The direction of motion is into the rigid object; therefore, the sign convention is positive into the object. To determine the properties for the spring and damper that make up F sb , experimental data derived from Sulzer et al ( 23 ) were used. In these experiments, moderate impact forces and acceleration profi les were measured by dropping an International Harmonization Research Activity head form (dummy head analogue) onto a rigid target.…”

Section: Lumped Parameter Mathematical Modelmentioning

confidence: 99%

“…In order to capture the effects of the skin, the impact model was split into an impacting and a rebound phase. During the impacting phase, the combined force from the spring and damper elements was described by a third order function, fi t to the data from Sulzer et al ( 23 ). This total force was scaled by the ratio of the energy in the modeled system to the energy in the referent system.…”

Section: Lumped Parameter Mathematical Modelmentioning

confidence: 99%

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