Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

D1b: Optimisation of Q dummies (APTS-INRETS)

In the field of protection improvement dedicated to children submitted to the risk of road collisions, the use of biofidelic dummies fitted with reliable sensors and the definition of appropriate protection reference values (PRV) for every body segment exposed to injury risk, is an essential objective. It is the reason why, INRETS is working in order to: enhance the dynamic response to compression of the thorax of the Q dummy family; improve the design and the dynamic response to compression of the abdominal insert; develop a new abdominal sensor and finally derive an injury criterion based on intra-abdominal pressure and rate of pressure change.

At the end of the first year of the CHILD project, the concept and the design of the modified abdominal insert and the new abdominal sensor were in the process of completion. In order to decrease the stiffness of the lumbo-sacral joint, anterior abdominal wall and abdominal foam core will be separated. The new abdominal pressure sensor which has to detect lap strap and/or shoulder strap penetration in the frontal impact and lateral load in the lateral collision will be composed of a right and a left lobe. Every part will be composed of a cylindrical bag made of polyurethane rubber, filled with gel, pressurised with air at 15E-3Mpa and fitted with a current industrial pressure cell. The sensor will provide two pressure signals which will be exploited in order to calculate the value of the AIC (Abdominal Injury Criterion) =V (rate of pressure change)*P (pressure magnitude). The validation of the sensor and the derived injury risk curve will be carried out owing to the experimentations (accident reconstructions and complementary parametric sled tests) planned in the CHILD project.

The design of INRETS's new abdominal pressure sensor for the Q3 is finished. INRETS's design is based on axonometric photographs and measurements taken directly on the physical dummy torso. The first prototype of the sensor has been manufactured by the company CLUZEL in Saint Bonnet de Mure near LYON. The INRETS's abdominal device can be used in addition with the piezo-electrical multi-point detector of TUB after modification of the abdomen (see drawing in annexe). By finishing the prototype of the sensor and the modification of the abdominal block at the end of February 2004, the instrumented abdomen will be provided to the partners at the beginning of April after evaluation and validation.

A series of sled tests were performed in order to evaluate the features and capabilities of the new abdominal instrument in terms of dynamic response to belt penetration, durability, repeatability, sensitivity to deceleration, etc. The sensor provide relevant signals when used on the Q3 dummy as well as the Q6 (same bladders embedded in the respective abdominal inserts).

Furthermore, the Abdominal Pressure Twin-Sensor has been currently utilized on the Q3 and Q6 dummies used for accident reconstructions. Correlations between abdominal injury severity sustained by the child and Injury Criteria value P*V seem to be acceptable. The whole set of values acquired on the planned experimentations (full scale tests and parametric sled tests) and the logistic regression law calculated from these values (Injury Risk Curve) will indicate whether the pressure sensor and the proposed criteria are reliable and can be used for predicting injury risk at abdomen.

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