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To evaluate the compression of the child's abdomen by the harness of a child restraint system in the event of a vehicle collision, a surface pressure meter was employed to measure dynamic pressure on the various parts of the abdome of a child dummy.
The surface pressure meter, shaped like a stomach band, was demarcated into a grid of 150 identical square cells arranged in 25 vertical columns and 6 horizontal rows, and was sandwiched with two sheets of pressure-sensing film each 0.1 mm thick.
The pressure value (Pa) at each cell was recorded and converted into a load value (N), and the load values of the 150 cells were added up to derive a total value of load on the abdomen as measure of abdominal compression.
Then, a pressure distribution chart was produced form the recorded data, representing the moment of maximun total load.
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Japanease
