Experimental assessment of vehicle performance and injury risk for cutaway buses using tilt table and modified dolly rollover tests

Seyedi, MohammadReza; Jung, Sungmoon; Dolzyk, Grzegorz; Wekezer, Jerry

doi:10.1016/j.aap.2019.105287

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…The required proximity for vehicles with different height and same track width are shown in Table 1 based on trigonometric relation. Even for small roll angles that are halfway to the required average safety angle in a tilt test [9], the required proximity around the vehicle is considerable. The mathematical equations are written by assuming the road profile is known accurately.…”

Section: Significance Of the Roll Angle On Lean-over Distancementioning

confidence: 99%

Collision of tall vehicles due to lean

Alapati¹

2020

Preprint

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Tall vehicles like trucks and buses tend to sway about roll axis when they encounter an uneven road surface that interacts differently with different wheels. The extent of this sway is significantly more for tall vehicles so much so, they lean over a certain distance to the side. When two tall vehicles move on an uneven road adjacent to each other, this lean-over distance should be considered to steer the vehicle to avoid any collision. This paper presents this scenario and also discusses a method that relates the lean-over distance to road geometry.

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Section: Significance Of the Roll Angle On Lean-over Distancementioning

confidence: 99%

Collision of tall vehicles due to lean

Alapati¹

2020

Preprint

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“…Model validation. Validation of the FE models were conducted using the experimental data conducted by Seyedi et al 18 Table 1 presents detailed information about the bus and its performance during the tilt table test resulted from experimental and FE analysis. Figure 3(a) shows the overall motion and kinematic of the bus's center of gravity (CG) during the tilt table simulation.…”

Section: Fe Modelsmentioning

confidence: 99%

“…The primary goal of this paper was to quantify the kinematics and injury risk of a 2-point belted occupant by finite element (FE) simulation of an ECE R66 tilt table rollover test. A baseline simulation of the tilt table test was conducted using a full FE model of a cutaway bus and the 50th male Hybrid III (HIII), with their results being validated using experimental data conducted by Seyedi et al 18 The correlation between the FE and experimental results was evaluated using CORA objective rating method proposed by Gehre et al 19 Since the lateral load is the dominant impact mechanism during a tilt table test, the EuroSID-2re (ES-2re), which was validated in previous studies, 20 was also utilized to assess the injury risks. Both ATD types were seated close to the impacted wall and were restrained by a 2-point seatbelt.…”

Section: Introductionmentioning

confidence: 99%

Numerical assessment of occupant responses during the bus rollover test: A finite element parametric study

Seyedi

Jung

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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Rollover crashes of buses are usually associated with multiple impacts that can result in complex interactions between passengers and a bus superstructure. Although there have been a few field data studies that provide some insights into occupant injuries (e.g. severity and distribution of injuries) during the real-world bus rollover crash, because they had used post-crash data, the occupant kinematics and injury mechanisms were not completely detailed in their results. Based on a literature review, available numerical and experimental studies on a bus rollover safety have mainly focused on structural integrity rather than considering occupant responses in their assessment. In addition, their results about occupant responses in bus rollover crashes show some discrepancies in terms of the estimated injury distribution, severity, and causes. Therefore, the main objective of this study was to provide a more detailed understanding of the occupant kinematics and associated injury risk during the ECE R66 tilt table bus rollover test using validated finite element (FE) models. The ECE R66 tilt table rollover was simulated using a full finite element model of the bus. A 50th percentile male Hybrid III Anthropomorphic test device (ATD) and EuroSID-2re FE models were selected to simulate the occupant’s motion. Each ATD was seated adjacent to the impacted side wall and restrained with a 2-point seatbelt. Simulation parameters included two impact surface friction values and different side window conditions. The results indicated that both ATD estimated the highest injury risk when the partial ejection occurred. They predicted a similar injury risk for the head and thorax. The ES-2re estimated a very low risk of neck injury in all simulations, whereas the Hybrid III estimated the high risk of a neck injury. Finally, recommendations to potentially reduce the injuries were provided and possible future works were suggested.

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“…To ensure the lifetime and timely maintenance of the tracked vehicle transmission, reliability evaluation and condition assessment should be performed [1]. Meanwhile, to guarantee the normal operation of transmission, the assessment of the vehicle transmission performance is necessary [2,3] and performance improvement will be achieved nally. With the help of the rotating parts, such as gears, shafts, and bearings, tracked vehicle transmission could realize di erent functions, such as straight driving, steering, and braking [4].…”

Section: Introductionmentioning

confidence: 99%

An Approach for Performance Assessment of Tracked Vehicle Transmission Based on the Median-Rank Weight and the Least-Square Support Vector Machine

Zou

Zhang

Yan

et al. 2022

Mathematical Problems in Engineering

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Transmission efficiency is one of the important indicators for the performance assessment of the tracked vehicle transmission device. Considering the influence of many factors in the transmission process at the straight driving mode, an approach for constructing the normalized comprehensive performance assessment indicator is proposed based on the median rank of no-load power loss and the median rank of transmission efficiency. Then, the performance assessment of the single tracked vehicle transmission device is performed with the least-square support vector machine (LSSVM). The results show that the stable comprehensive performance assessment indicator could be obtained in the first 10 speed measurement points, and the performance state of the vehicle transmission device is identified according to the criterion.

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Experimental assessment of vehicle performance and injury risk for cutaway buses using tilt table and modified dolly rollover tests

Cited by 12 publications

References 25 publications

Collision of tall vehicles due to lean

Collision of tall vehicles due to lean

Numerical assessment of occupant responses during the bus rollover test: A finite element parametric study

An Approach for Performance Assessment of Tracked Vehicle Transmission Based on the Median-Rank Weight and the Least-Square Support Vector Machine

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