Virtual evaluation method, device and equipment for pedestrian head protection performance of vehicle

Abstract

The invention discloses a virtual evaluation method, device and equipment for pedestrian head protection performance of a vehicle. The method comprises the steps that accident information in an accident site is collected; wherein the accident information comprises pedestrian information and vehicle information in an accident site; person according to accident information Vehicle collision motionreconstruction to reproduce people-in the accident scene A collision form of vehicle collision; analysis of real person through collision morphology The distribution rule of vehicle collision initialboundary conditions; depending on pedestrian models and the real person- And establishing a virtual evaluation model of the pedestrian head protection performance of the vehicle according to the distribution rule of the vehicle collision initial boundary conditions so as to evaluate the pedestrian head protection performance of the real vehicle. By establishing the virtual evaluation model of thepedestrian head protection performance of the vehicle, the pedestrian head protection performance of the real vehicle is evaluated, and the traffic damage of the vehicle to the pedestrian head can beeffectively prevented.

Description

technical field [0001] The invention relates to the application field of traffic technology, in particular to a method, device and equipment for virtual evaluation of vehicle-to-pedestrian head protection performance. Background technique [0002] According to the report of the World Health Organization in 2018, nearly 1.35 million people died in traffic accidents around the world. Among them, pedestrians were extremely vulnerable due to lack of effective protection in collision accidents, accounting for 23%. In China, nearly 55,000 people die in traffic accidents every year, among which 25% are pedestrians. Although the global traffic safety situation has eased somewhat after years of accumulation of basic research, the continuous improvement of relevant laws and regulations, and the improvement of public safety awareness, in developing countries and regions including my country, due to the rapid development of traffic , the number of cars has increased sharply, the traffic...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on pedestrian head injury protection mainly focuses on the following two levels: In the virtual environment, using the multi-rigid body numerical model of the human body to reconstruct the pedestrian collision accident and reproduce the head injury, mainly based on the kinematic parameters of the human head (acceleration, velocity and angular acceleration, etc.) to evaluate and predict head injuries. For craniocerebral injuries that frequently occur in human-vehicle collision accidents, considering that if a full-scale finite element pedestrian model is used for analysis, the adjustment process of human body posture and the results of collision calculation The time required is greatly increased, and it is extremely dependent on the computing performance of the computer (there are some mesh deformation technologies, but the efficiency is still low), so the mainstream method is: export the head collision boundary conditions obtained in the above analysis and input to a separate FE model of the head for head injury analysis

Although this method can obtain the response parameters of the brain tissue of the head, it does not consider the influence of other parts of the body on the head-vehicle collision process, and cannot evaluate the damage caused by the secondary collision (ie, the collision when the head lands); In the real environment, the national standard GB / T24550-2009 "Collision Protection of Automobiles to Pedestrians" and the Chinese New Car Assessment Program C-NCAP (China-New Car Assessment Program) both use the head impactor (Headform) to simulate the head The head of the car collides with a specific area in front of the car, and the head injury criterion HIC value measured from the experiment is used to evaluate the protection performance of the vehicle for the pedestrian's head

This method also does not consider the impact of other parts of the body on the head-vehicle collision process, and cannot evaluate the damage caused by the secondary collision (that is, the collision when the head lands); and the physical model cannot measure head injury

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