支撑腿误使用对ISOFIX型儿童座椅安全性能的影响

Influence of support leg misuse on the safety performance of child restraint system ISOFIX

支撑腿是ISOFIX型儿童座椅(CRS)的一种抗翻转装置,支撑腿的误使用现象非常普遍。该文使用P系列3岁儿童假人(P3)进行了台车试验,将支撑腿正常使用和误使用情况下儿童假人的伤害值进行对比,结合MADYMO仿真分析,量化支撑腿误使用情况下儿童假人各伤害指标损伤值的增加量。不使用支撑腿﹑支撑腿与地板有间隙﹑支撑腿与地板有预紧这3种误使用与正常使用的台车对比试验。结果表明:与正常使用相比,在几种支撑腿误使用情况下,假人头部最大位移量将增加14.3%,头部HIC值最大增加37.2%,胸部3 ms加速度最大增加37.3%;仿真结果与试验有相同的变化趋势。

The support leg of child restraint system （CRS） is an anti-reversal equipment of the ISOFIX type CRS. However, the misuse of the equipment by consumers is very common. Several sled tests were carried out to analyze the influence of the support leg misuse on the safety performance of CRS quantitatively, using the P-series 3-year-old （P3） dummy with different layouts of the support leg, and the injury values of the dummy under both normal conditions and misused conditions were compared. The increase of each injury value of the dummy under the misused condition was analyzed with the simulation in the environment of MADYMO. The trial results show that the head forward excursion, the HIC head injury criteria, and the chest resultant 3-ms acceleration of the dummy increases by 14.3%, 37.2% and 37.3% respectively at most when the support leg is misused.