Abstract
Seat is one of the important parameters for occupant safety during an impact. The occupant injury characteristics are vital for better seat development. For improving occupant safety during impact, the research on the seat structure optimization in front and rear impact was conducted in this paper. Dummy-seat finite element simulation model was established and analyzed by using HyperMesh and LS-DYNA software. The model was verified with test data before further application. Then, the model was simulated to determine its performance on the head, chest and neck injury of the dummy in the frontal and rear impact. The simulation results showed that the original model cannot provide effective protection according to CNCAP regulation. Thus, modification should be carried out. On the basis of previous study, seat side plate, lower bracket under cushion, and back lock member were modified by implementing orthogonal experiment design method to determine the best option. The optimized solution A4B4C2 was gained through range analysis and integrated balance method. After simulation, chest compression reduced 17.21%, 3ms resultant acceleration reduced 21.16%, dummy neck FX decreased 15.44%, MZ value decreased 3.13%, and backrest angle decreased 46.1%. It was indicated that the optimized structure can improve passenger protection. It was illustrated that the model based method combining HyperMesh and LSDYNA was an effective way for seat development and for conducting occupant injury study.
Highlights
With the development of auto industry, the safety of the car has increasingly become an important research field for modern automobile development design [1, 2].As an important safety component, vehicle seat is a hot spot in the study of automobile safety and it provides a decisive protection for passengers [3]
Yang [5] analyzed that insufficient stiffness of seat cushion is the cause of human body diving in rear collision which results in greater damage on the abdomen in 2012
Based on a domestic car seat, a seat-occupant finite element model was established by using HyperMesh and LSDYNA simulation software to study the passenger injury characteristics during front and rear impact
Summary
With the development of auto industry, the safety of the car has increasingly become an important research field for modern automobile development design [1, 2]. According to the recent research status abroad, Nicolas [6] established finite element models of multi-body human body and seat to study the safety of the crew in rear crash. Chen [8] established multi-rigid-body crash model to analyze the seat parameter effect on passenger injury during rear impact and optimize the seat structure. Based on a domestic car seat, a seat-occupant finite element model was established by using HyperMesh and LSDYNA simulation software to study the passenger injury characteristics during front and rear impact. The main purpose was to analyze the performance of the seat and the improvement and optimization of the structure, to improve dummy injury indicators to provide effective protection for occupants and to provide a method for modern seat design and passenger protection evaluation
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