A Study for Analysis Technique for Ensuring the Head Injury Criterion and Ejection Mitigation Performance of Curtain Airbag

The role of CAB is protecting the passenger's head during rollover and side crash accidents. However, the performance of HIC and ejection mitigation has trade-off relation, so analytical method to satisfy the HIC and ejection mitigation performance are required. In this study, 3 types of CAB were used for ejection mitigation analysis, drop tower analysis and SINCAP MDB analysis. Impactor which has 18kg mass is impacting the CAB as 20KPH velocity at six impact positions for ejection mitigation analysis. In drop tower analysis, impactor which has 9kg mass is impacting the CAB as 17.7KPH velocity. Acceleration value was derived by drop tower analysis and the tendency of HIC was estimated. Motion data of a vehicle structure was inserted to substructure model and the SID-IIS 5%ile female dummy was used for SINCAP MDB analysis. As a result, HIC and acceleration values were derived by MDB analysis. As a result of ejection mitigation analysis, the impactor was ejected in type 1 of the CAB but the impactor was not ejected in type 2 and type 3. Acceleration value of type 2 was highest and type 1 was lowest by drop tower analysis. Similarly, in the SINCAP MDB analysis, HIC of type 2 was highest and type 1 was lowest. Trade off relation between the ejection mitigation result and SINCAP MDB result was confirmed. Tendency of acceleration for drop tower result was similar with SINCAP MDB result. As a result, type 3 of CAB was satisfied requirements of ejection mitigation and HIC.