A Study Of The Car Seat Structure Based On Impact Dynamic Response And Analysis

With the continuous increasing of the quantity and of the speed of automobile, the incidence of traffic accidents also rose ceaselessly. Though the rear collision has lower lethality rate, the damages caused place a heavy burden on the injured as well as the society. During the process of rear collision, it is the car seat that mainly protects passengers. Therefore, to improve the Passive Safety of car seat becomes one key factor of decreasing damage during the accident of rear collision. By stimulating the impact response process of passengers within the accident, the structure of car seat with less damage to people could be known through the comparison which offers more protection on passengers during the car accidents. And it will have great importance to the research of passenger protection and to the design method of car seat frame structure.This study measured the basic dimensions of actual seat frame and built the finite element model with three groups of seat frames. Based on the knowledge of human anatomy, one male volunteer with175cm of the height and65kg of the weight as the modeling material, pelvic model was built up which improved the finite element model of human upper limb and increased the simulation authenticity. The finite element model was built with seat frame including headrest, backrest, recliner, brackets, rails etc., and human upper limb including cranium, cervical vertebral, thoracic vertebra, costa, costicartilage, sternum, clavicle, scapula, intervertebral disc, muscle, ligament, lumbar vertebra and pelvic etc. The ANSYS/LS-DYNA of nonlinear dynamics analysis as the solving tool was applied to make the impact loading to the model. The stimulation results and the volunteer experiment and cadaver experiment were compared to verify and ensure the validity of the model.After the stimulation of rear collision, the stress and strain values with different type of backrest and human upper limb were calculated. The results showed that during the rear collision, the cervical vertebral C1, C2and thoracic vertebra T1,T2and T3had relatively higher stress and strain values. The first four pairs of costae compared to other costae also showed greater stress and strain values, and the cervical intervertebral was the most easily damage part during the rear collision, intervertebral disc between C2and C3as well as C3and C4had the highest stress and strain values. Thoracic vertebra from T1to T4also showed relatively bigger stress and strain values. Based on the analysis above, the results showed one seatback frame with better occupant protection during car accident, which offered an effective method to evaluate the design of seat security.