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- 저자 : Hung Anh Ly (검색결과 2 건)
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Anh Ly Hung,Nguyen Phu Thuong Luu,Vu Ngo Anh 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.2
This paper employed finite-element simulation together with a human body model (HBM) - THUMS to study the head injury risk of a pedestrian involved in a frontal impact with a sedan car. While previous studies have gained an intensive understanding of the effects of various factors on pedestrian injury, their results were mainly based on standard-sized HBMs. Hence, a scaling procedure was first applied for the THUMS to obtain a model that possesses Vietnamese anthropometry. A total of thirty simulations were conducted to investigate the effect of various parameters, including impact angle, impact location, and impact speed, on the head injury criterion (HIC) of the scaled THUMS. Besides, each simulation covered not only the car-to-pedestrian impact but also the pedestrian-to-ground impact. Thus, the head injury of the pedestrian in both primary impact and secondary impact could be evaluated. Results showed that HIC increased consistently with impact speed for primary impact. An impact at the center of the car was more critical than that at the corner. Whereas, the effect of impact angle varied depending on the impact location. Regarding the secondary impact, HIC value was found to be highly sensitive to the posture of the pedestrian before impacting to the ground. In most cases, HIC was much higher in secondary impact than in primary impact. In other words, secondary impact poses a high risk of fatality to pedestrians in a traffic accident.
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LOWER EXTREMITY INJURY OF VIETNAMESE PEDESTRIAN IN CRASH BY A SEDAN USING NUMERICAL SIMULATION
Phu Thuong Luu Nguyen,Hung Anh Ly,Thien Phu Nguyen 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.1
Pedestrians are among the most vulnerable road users, who often suffer serious injuries in road collisions. Therefore, evaluating the injury of a pedestrian is absolutely necessary. This paper aims to evaluate the lower extremity injuries for Vietnamese people by numerical simulation using a Human Body Model (HBM) – Total Human Model for Safety (THUMS). Considering that the HBM has the anthropometrical and biomechanical properties of the North American and European bodies, it is required to scale it down to represent Vietnamese anthropometry. Furthermore, it is necessary to develop a scaling algorithm to scale the published lower extremity injury criteria to properly assess the injury risk of a Vietnamese. After a Vietnamese-sized HBM is obtained from the scaling procedure, its posture is adjusted to represent a walking pedestrian. A sedan is employed for simulating the pedestrian collision with the impact velocity ranging from 20 to 50 km/h. The car models are simplified to reduce computational time. The findings illustrate that the bending moment and resultant force of femur and tibia increase with respect to the impact velocity. The knee ligaments have been injured at high risk.
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