MADYMO modeling method of rollover event and occupant behavior in each rollover initiation type

The purpose of this research was to understand the differences between vehicle and occupant kinematics for the various forms of rollovers. In particular the occupant kinematics in the initial phase of the rollover was studied, which is critical in determining the restraint system activation timing. Six rollover tests were conducted consisting of six initiation types; FMVSS 208, SAE J857, corkscrew, curb trip, soil trip, and ditch rollover. From this test data MADYMO models were constructed of the vehicle and occupant. The test data included the influence of gravity, therefore, a method to adjust for the influence of gravity was developed for the MADYMO models. The vehicle model was validated using curb trip and SAE J857 tests. The compensation procedure for the influence of gravity was also confirmed. Once the vehicle model was validated using the two test modes, each of the other test modes were simulated and the dummy head behaviour was compared to the actual test data. From the simulation results and the actual test data the differences in the occupant kinematics for each of the rollover initiation types was compared. For the covering abstract see ITRD E825082.