Influence of the geometric parameters of the vehicle frontal profile on the pedestrian’s head accelerations in case of accidents

Tolea, Bogdan; Radu, Alexandru Ionut; Beles, Horia; Antonya, Csaba

doi:10.1007/s12239-018-0009-0

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…The height of the vehicle and the shape of the body are two important factors in terms of the severity of pedestrian injury, as described in [3]. In recent years, there has been a tendency to decrease the height of the vehicle's centre of gravity and the height of the bonnet, leading to head injury by hitting the bonnet or windscreen of adult pedestrians.…”

Section: The Shape Of the Vehicle Frontal Profilementioning

confidence: 99%

Comparative Analysis of Pedestrian Throwing Distance Following a Collision with a Vehicle

Oţăt¹,

Dumitru²,

Tutunea³

et al. 2023

Atlantis Highlights in Engineering

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Starting from the statistical data in the field, according to which the most vulnerable road users are pedestrians, with the highest number of deaths, the present research deals with the problem of the impact between a vehicle and a pedestrian.The main purpose of this study is to carry out a comparative analysis on the determination of kinematic parameters in the case of vehicle -pedestrian collision. An influencing factor on the value of the kinematic parameters and the pedestrian trajectory following the collision is represented by the front profile of the vehicle. For the virtual modeling of this impact, different frontal profiles of the vehicle were considered, but with the same characteristics of the pedestrian and the same impact speed.The comparative analysis of the vehicle -pedestrian impact takes into account three different types of vehicle in terms of the frontal profile shape, namely: almost flat and vertical profile, high profile and low profile. The determination of the projection distances of the pedestrian following the impact was carried out by two methods.

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Section: The Shape Of the Vehicle Frontal Profilementioning

confidence: 99%

Comparative Analysis of Pedestrian Throwing Distance Following a Collision with a Vehicle

Oţăt¹,

Dumitru²,

Tutunea³

et al. 2023

Atlantis Highlights in Engineering

View full text Add to dashboard Cite

show abstract

“…Ignoring the body's own mitigation effect, the values of the positive and brake accelerations are approximately equal. The movement of the human body being equivalent to rigid body can be regarded as a rotational movement with the lower part of the waist (close to the end of the spine) as the axis of rotation [17]- [19]. Assume that the pilot's lower limbs are fixed, and there is no relative sliding with the seat during braking.…”

Section: A Head Component Modelmentioning

confidence: 99%

Design, Analysis and Testing of a Component Head Injury Criterion Tester for Pilot

et al. 2019

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In a large braking environment, the head of the pilot would collide with the head up display (HUD) because of the aircraft pilot's body leaning forward under inertia. And the preload of the HUD determines whether the head is injured during the collision. Therefore, it is necessary to design a test component for investigating the influence of the mounting preload on head injury during the collision. Consideration of pilot safety, in this paper, the motion characteristics of the pilot is analyzed, and a component of head injury criteria tester for head impact test is established. Given the short-time and high-speed characteristics of the head impact, the driving method adopted hydraulic ejection. This method effectively solves the problems of space limitation and non-reusability in traditional methods. The computational fluid dynamics model and kinematic model of human body are used in this study to simulate the acceleration process. The AMESIM simulation model is set up to study the influence of key parameters on the velocity, angle and acceleration of the system collision moment, to optimize the system parameters and to be verified through experimental studies. The ultimate objective is to achieve that the linear velocity is 11 m/s when the test component rotates at a specified angle. This research can be referred to in the design of a component HIC tester and the study on optimization of fluid flow dynamic characteristics.INDEX TERMS Preload of the HUD, head injury criteria tester, head impact test, hydraulic ejection, optimize parameters.

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“…Researchers found that vehicle type, collision speed, pedestrian gait, and walking speed could affect pedestrian head injuries. [2][3][4][5] Geometry and material of vehicle front end and pedestrian orientation were also believed to affect pedestrian head injuries as well. [6][7][8] Thus, pedestrian head injuries are most likely to be concerned in vehicle-pedestrian crashes.…”

Section: Introductionmentioning

confidence: 99%

“…But it should be noted and emphasized that most of the conclusions took scenarios (pedestrian head in contact with bonnet, A pillar, windshield, and windshield frame) into account together at present. [2][3][4][5][6][7][8] Conclusion was drawn that the head injury risk of head-windshield frame impacts and head-A pillar impacts was significantly higher than that of head-windshield impacts and head-bonnet impacts, [9][10][11][12][13][14] whereas parameter sensitivity on the head dynamic response and injuries of various scenarios above remains unclear. Here, we set out to investigate the scenario with head hitting windshield.…”

Section: Introductionmentioning

confidence: 99%

Parameter sensitivity analysis of pedestrian head dynamic response and injuries based on coupling simulations

Liu

Duan

et al. 2019

Science Progress

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There are a very limited number of reports studying on the dynamic response and injuries of pedestrian head in the scenarios with head hitting windshield. This study aims to investigate the significant factors that affect the dynamic response and injuries of pedestrian head through finite element-multi-body coupling simulations. Two finite element vehicle models and two multi-body pedestrian human models were used to build the coupling simulations. Orthogonal experimental design and analysis of variance were used for parameter combination and data analysis. This study demonstrated that the dynamic response of pedestrian head and HIC 15 were strongly associated with collision speed and pedestrian orientation. Vehicle type had a significant influence on the dynamic response of pedestrian head and HIC 15 , while there was no significant relationship between the dynamic response of pedestrian head and HIC 15 and the size of pedestrian human models. Collision speed, pedestrian orientation, and vehicle type should be prioritized over the other collision parameters in the study of head injury mechanism and reconstruction of vehiclepedestrian collisions in the scenarios with head hitting windshield.

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Influence of the geometric parameters of the vehicle frontal profile on the pedestrian’s head accelerations in case of accidents

Cited by 7 publications

References 11 publications

Comparative Analysis of Pedestrian Throwing Distance Following a Collision with a Vehicle

Comparative Analysis of Pedestrian Throwing Distance Following a Collision with a Vehicle

Design, Analysis and Testing of a Component Head Injury Criterion Tester for Pilot

Parameter sensitivity analysis of pedestrian head dynamic response and injuries based on coupling simulations

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