TRANSPOLIS produces Abdominal Pressure Twin Sensors(APTS) developed by IFSTTAR(French institute of science and technology for transport, development and networks) for the Q-dummies series, which are an essential tool for the in-depth assessment of child restraint systems.
In the context of the new regulation ECE R129 (which will replace ECE R44/04), this new instrumentation is indispensable, not least because abdominal pressure sensors are now adopted in the UN Regulation for dummies used to certify restraint systems for children.
The process has taken time to become mandatory and be included in the regulation. This regulation was introduced thanks to the work done by the European Enhanced Vehicle Safety Committee(EEVC).
International projects are also under way to extend the use of this sensor to adult dummies such as the 50th percentile man and the 5th percentile woman.
Each sensor is composed of a soft cylindrical elastomer bladder, filled with a thick liquid and closed by a metal cap containing a miniature pressure sensor. The key design of the fluid-elastomer assembly accurately represents the stiffness of the abdominal tissues.
The ability of the restraint system to meet with the regulatory criterion is assessed by recording the sensor pressure during the crash test. For testing, the sensors are vertically implanted by pair in the abdomen: they enable the provision of relevant information needed for the assessment of abdominal injuries.
APTS sensors were developed for the Q-Dummies series, representing children from 1 to 10 years of age. Fitted vertically in pairs in the dummy’s abdomen, they are an indispensable tool in the assessment of abdominal lesions caused during crash tests on restraint systems for children:
- APTS-D30: sensors measuring 30 mm in diameter for the abdomen of dummy Q1/1.5
- APTS-D40: sensors measuring 40 mm in diameter for the abdomens of dummies Q3 and Q6
- APTS-D50: sensors measuring 50 mm in diameter for the abdomen of dummy Q10.
Dimension L x D(mm)
Biofidelity static response(bar/mm)
105 x 30
81 +/- 2%
1.01/10.81 +/- 10%
125 x 40
160 +/- 2%
0.67/16.51 +/- 10%
141 x 50
272 +/- 2%
0.60/15.81 +/- 10%