Comparison of Jordan and unconstrained dynamic rollover tests using computational finite element method
AdvisorLankarani, Hamid M.
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Rollover crashes are complex and relatively infrequent compared with other types of vehicle crashes, but they result in highest fatality rates among all common types of vehicle accidents. The Sport Utility Vehicles (SUV's) are the most common vehicles involved in rollover crashes compared to other vehicles. Different types of static and dynamic test methods have been proposed and implemented to evaluate the performance of a vehicle in rollover crashes. However due to complexity of rollover crashes, no specific dynamic method is required at present to evaluate the rollover crash and occupant protection responses, as a several factors could affect the rollover impact outcome. In this study, the finite element modeling and simulation of a typical SUV is first conducted for static roof crush test per regulatory Federal Motor Vehicle Safety Standards (FMVSS) 216. Once model evaluation and validation is completed, the finite element modeling and simulation of a simplified Jordan Rollover System (JRS) is conducted and the results are compared with these corresponding to an unconstrained rollover tests, both performed on the same SUV. A parametric study is conducted for pertinent dynamic rollover parameters such as drop height of the vehicle, and the platform floor speed. The results from the simulation test measurements including intrusion of roof components, reaction/contact force on the platform, roll angle, and roll rate of the vehicle, and the internal energy generated of the rollover are all examined and compared. Results from the simulations are analyzed to examine the significance of using either JRS or unconstrained rollover models. Recommendations are made based on initial rollover conditions for better dynamic approach and suggestion for test protocols or standards.
Thesis (M.S.)-- Wichita State University, College of Engineering, Dept. of Mechanical Engineering