Layout Optimization And Strength Analysis Of The Driver’s Seat Belt Anchorages For A MPV Model

As an important part of automobile passive safety system,seat belt has been compulsively installed by national regulations.The law GB14167-2013 makes explicit requirements for layout area and strength of seat belt anchorages.Although users have realized the importance of seat belt,they are often tired of wearing seat belt because of its discomfort.Optimizing the layout of the seat belt anchorages and enhancing the wear comfort is of great significance for improving seat belt use rate.Firstly,a MPV model in this thesis was taken as the object of study,the seat belt wear simulation was performed in the RAMSIS software on the basis that the positions of upper belt attaching point,lower belt attaching point and lower anchorage met the requirements of regulations.Based on discomfort of driving posture,the layout of cockpit was evaluated using the Manikan method to simulate seat belt wear and analyze results.The results show that the Chinese men of 95 th and 50 th meet the requirements and the 5th female does not.Secondly,the influence factors of seat belt results in RAMSIS software were explored,and test results were compared with simulation results to verify the high reliability of the software.The results show that the influence of the torso angle of the human body is slight in the small range,and there is almost no effect on lower anchorage;The factors with significant influence mainly include: the location of human H point in the X and Y directions,the key dimensions of the human body(such as sitting height,waist circumference and chest depth),the positions of upper belt attaching point and lower belt attaching point.Thirdly,new three percentile human body models were created by modifying the body size data of GB 10000-1988,the seat belt wear simulation model was improved,and the position of upper belt attaching point was also optimized to meet seat belt wear comfort requirements of three kinds of human.Finally,the strength of seat belt anchorage after optimization was simulated,and the real vehicle test was verified in the paper.The finite element model of the body,the seat,the human body and the seat belt are built by the Hypermesh software.The hybrid element algorithm was used to guarantee the simulation accuracy and computational efficiency.LS-DYNA software was used to solve with explicit finite element method,and view the eventually calculation results through HyperView.The results show that several critical parts meet the plastic deformation requirements of the material and pass the regulatory test simultaneously.