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The effectiveness of the invention "JR System" in protecting the occupant in side impact collision.

Introduction

This study is the preliminary evaluation of the potential usefulness of the invention called “JR System”, International Application No.PCT/PL04/000018, to protect the occupants during side impact collision. The new system reduces the friction force between the target car and the road surface by raising the wheels just before the impact and thus the better protection of the target car passengers is expected.



Materials and methods

The analysis was based on the computer simulations performed in the MADYMO®2 software environment and the basic test conditions comply with the Euro-NCAP side impact test protocol. The four airbags were attached to the active suspension elements of the undercarriage of the car. The model of the car is also equipped with the two side airbags, one protecting the thoracic and abdominal parts and one tube-airbag protecting the driver’s head.



Results and conclusions

To evaluate the effectiveness of the new solution several injury criteria and maximum door internal intrusion were compared for the two cases: standard car and car equipped with the “JR System”, for different barrier speed and mass. Additionally the simulations with the non-standard position of the bumper of the bullet car were carried out which simulates the collision with the SUV type of a car.

Test conditions

HIC

VC Rib up [m/s]

TTI [g]

Chest deflect. [m]

Pillar intrusion [m]

Stand.

JR sys

Stand.

JR sys

Stand.

JR sys

Stand.

JR sys

Stand.

JR sys

V0_B50kmph_1t

131,40

94,50

1,08

1,21

136,9

154,5

0,0561

0,0543

0,337

0,315

V0_B50kmph_1.5t

147,90

128,90

1,40

1,13

153,5

159,1

0,0564

0,0564

0,361

0,347

V0_B50kmph_2.0t

154,00

148,00

1,50

1,49

152,7

177,4

0,0575

0,0566

0,370

0,362

V0_B30kmph_1t

26,00

19,60

0,15

0,08

65,2

81,7

0,0354

0,0412

0,201

0,183

V10_B50kmph_1t

65,60

58,30

0,84

0,73

122,6

130,7

0,0445

0,0490

0,323

0,301

V0_B50kmph_2t_SUV

211,50

134,80

1,87

1,45

213,4

174,2

0,0581

0,0572

0,403

0,362

Threshold values

1000

1000

 1.3

1.3

85

85

0.064

0,064

-

-


The results obtained showed that the new side protection system reduces the values of some of the injury criteria (e.g. HIC and VC Rib up) and also reduces the intrusion of the pillar inside the car compartment which improves the occupant safety. However, some of the criteria were not significantly changed or the values were even higher for the case with the “JR system” applied. Therefore, based on the preliminary study with the simplified model it can be stated that the results show some improvements in the occupant protection in particular cases and areas, however the further investigation, with the more detailed models, into this subject should be proceeded in order to prove the hitherto stated thesis and to search for potential disadvantages of the system.

MADYMO (Mathematical Dynamical Models) is an advanced software engineering tool developed by TNO. MADYMO is the worldwide standard for occupant safety analysis. Uniquely combining multibody and Finite Element techniques, MADYMO allows users to design and optimise the vehicle structures, components and safety systems at the very start of the development track – thereby minimising the need of costly and time-consuming mechanical prototypes.

>>> Seek us in Preliminary Program on:
10th International MADYMO Users Meeting, Amsterdam, October 20-21, 2004


VISEB - Virtual Safety Engineering and Biomechanics Lab
http://www.meil.pw.edu.pl


TNO Homepage
http://www.tno.nl/homepage.html

TNO Homepage


MADYMO Homepage
www.madymo.com


EURO-NCAP Homepage
www.euroncap.com



IIHS - Insurance Institute for Highway Safety
http://www.iihs.org

IIHS Homepage


Authors of research:

Kajetan Kietlinski and Michal Pedzisz
Ph.D. students of Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics, VISEB Lab; Nowowiejska 24, 00-665 Warsaw, Poland.


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