Subjects: Traffic and Transportation Engineering >> Road Engineering submitted time 2024-02-07 Cooperative journals: 《应用力学学报》
Abstract：
A finite element model for train-dummy integrated passive safety simulation analysis was constructed based on the dummy model representing the male human characteristics of 50th percentile in China.The attitude changes of occupants during train collisions were analyzed,and the mechanical response characteristics of the head and neck of occupants were explored.The influence mechanism of seat alignment on occupants’ head and neck injury response was also revealed,and an injury risk prediction model based on head and neck biomechanical injury parameters was developed.The results show that the collision between the occupant’s face and the front seat may cause primary brain stem injury.The front and back curvature of the occupant’s neck will lead to the greater stress in the lower neck cervical spine,and it will also lead to the greater stress in the intervertebral disc of upper and lower necks,respectively.The Nij tolerance limit specified in the current standard will significantly underestimate the neck injuries suffered by occupants in rear-end train collisions.
Subjects: Traffic and Transportation Engineering >> Road Engineering submitted time 2024-02-07 Cooperative journals: 《应用力学学报》
Abstract：
In order to investigate the problem of frequent wheel flange crack damage in a high-power heavy haul locomotive operating on high-altitude multi-curved railway lines in China,a combined approach of theoretical analysis,numerical simulation,and field test is employed.First,based on multibody dynamics and stability theory,a vehicle dynamics model for the high-power heavy haul locomotive and a prediction model for wheel flange crack damage are respectively established.Next,the accuracy of the model is validated by comparing field test data with numerical simulation results.Finally,based on the characteristics of the operating route for the heavy haul locomotive,an analysis is conducted on the effects of curve radius,curve superelevation,curve gradient,and wheel flange lubrication on the damage pattern of wheel flange cracks.The research results indicate that continuous small radius curves are the main cause of wheel flange cracks in this heavy haul locomotive.In addition,wheel flange lubrication has a significant effect on the locomotive wheel flange crack damage.Therefore,the wheel-rail dynamic interaction can be reduced by setting appropriate route parameters and implementing effective wheel flange lubrication,and the occurrence of wheel flange cracks in the heavy haul locomotive can be minimized.
Subjects: Geosciences >> Geography Subjects: Traffic and Transportation Engineering >> Road Engineering submitted time 2019-03-31
Abstract： " Based on metacartography, this study establishes a model to convert the time distance of taking light rail to the spatial distance in meters. On this basis, this study uses the spatial transformation method of geographic information system (GIS) map projection to redefine the distance between two locations with the converted distance and transforms the original map into a time distance map. By spatializing the time distance, this study gives time distance a visual expression. The results show that the influence of light rail on urban form is affected by the distance between the station points and the selected center point; that is, that the transformation is greater when the station points are farther away from the center point, and vice versa. The impact of light rail on the layout of business centers is basically distributed in the shape of a circle. Time distance compresses the traditional urban form. There is still much room for the city to further compress the time distance, and the existing business centers should be upgraded.
Peer Review Status:
Awaiting Review
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