Field rapid evaluation method for pedestrian chest closed injuries based on improved evaluation index

Abstract

The present invention discloses a field rapid evaluation method for pedestrian chest closed injuries based on an improved evaluation index. The method comprises: S1, screening a damage index which is used for evaluating chest closed injuries in a finite element simulation, and a vehicle-pedestrian accident parameter which is used for evaluating chest closed injuries in an accident field investigation; S2, calculating a pedestrian chest compression amount C, a chest viscosity index VC and a thoracic pressure P in a finite element simulation orthogonal experiment; S3, according to the damage index chosen in S1, accquring a weight coefficient of an index according to a chest closed injuries epidemiology investigation to form a comprehensive evaluation index of pedestrian chest closed injuries; S4, according to regression analysis on chest closed injuries epidemiology data, acquiring an impact factor function of damage evaluation; and S5, investigating and acquiring the vehicle-pedestrian accident parameter chosen in S1, calculating an injury degree probability of the chest closed injuries, and grasping an injury severity degree of the pedestrian chest closed injuries, so as to rapidly perform corresponding field emergency treatment according to pedestrian chest injuries conditions.

Description

technical field [0001] The invention relates to the fields of traffic engineering and injury biomechanics, in particular to a rapid on-site evaluation method for closed chest injuries of pedestrians based on improved evaluation indexes. Background technique [0002] In the existing crash safety regulations, the chest injury analysis indexes mainly include force and acceleration, chest compression amount and compression rate, TTI (chest injury index) and chest VC (viscosity index). Chest acceleration is a physical quantity that is easy to measure, so the chest damage tolerance-chest g value determined by a single parameter is generated. However, the chest contains bones, muscles and organs, and its internal structure is relatively complicated. If it is regarded as a A simple and uniform mass module will be difficult to accurately analyze its damage. A large number of cadaver experiments have proved that chest compression C can better predict the degree of chest injury than t...

AI Technical Summary

Problems solved by technology

Car collisions with pedestrians' chests usually occur within the collision speed range of 3-35m / s. The resulting pedestrian chest closed injury mechanism is complex, the incidence of combined injuries is high, and the injury judgment is difficult. In order to quantify pedestrians more quickly and accurately To determine the severity of closed chest injuries, it is necessary to propose a comprehensive evaluation index for closed chest injuries that takes into account both "squeeze" injuries and "impact" injuries and a rapid on-site assessment method.

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