Transactions of Nanjing University of Aeronautics & Astronautics
Occupant Restraint System Simulation and Optimization Based on TESW
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Abstract:
Integrated into the development process of a chinese independent brand class sedan, optimization about occupant restraint system associated with dummy chest deceleration is studied. Based on this simulated vehicle deceleration and the target vehicle′s chest deceleration, tipped equivalent square wave (TESW) is calculated by combining t he average stiffness k of occupant restraint system and the average free flight time t* from the existant C-NCAP (China new car assessment program)tested cars. After proposing modeling regulations of occupant restraint system and establishing mathematical dynamic modelling (MADYMO) for occupant restraint system of the target vehicle, four optimization design parameters namely vent area A, load limit L, seat belt extension ratio B and pretension force Fare selected by weighted injury criteria (WIC) rule and the first-order response surface method. The four parameters have been optimized by using orthogonal test design of four factors with five levels and the optimum combination A5L1B1F5 has been chosen by range and variance analyses. The results show that occupant restraint system performance has been optimized and improved, while meeting the chest deceleration calculation peak based on TESW.
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