On the Concept of Inter-Vehicle Friction and Its Application in Automobile Accident Reconstruction

Marine, Micky C.

doi:10.4271/2007-01-0744

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…The details about the coefficient of angular projection ρ can refer to ref. [50]. And it can be interpreted as a lumped energy dissipation within the collision process, which is denoted as:

\begin{equation} \rho =\frac{P_{Y^\prime }}{P_{X^\prime }}.

…”

Section: Modelling and Control Problem Formulationmentioning

confidence: 99%

Advanced post‐impact safety and stability control for electric vehicles

Ao¹,

Zhang

et al. 2022

IET Intelligent Trans Sys

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In terms of the possible secondary or multiple events accidents (MEA) after an initial vehicle to vehicle (V2V) impact, this research proposes an active safety & stability controller for independent-driven electric vehicles towards recovering the vehicle to safety states after an impact. The controller aims to regulate the course angle and lateral deviation that enforce the vehicle back to its original driving path. The upper-level controller is derived based on sliding mode technique. And the low-level controller aims to solve a convex quadratic allocation problem, which inherently incorporates fault-tolerance property. The independent in-wheel-motor (IWM) fault is very likely to happen under a real V2V impact and it contributes much to the driving safety & stability. Two typical real-endcollision scenarios under low-and high longitudinal velocities are designed to verify the proposed controller performance. The low-and high velocities collisions aim to simulate the urban and highway accidents, respectively. Compared to other control methods, i.e. pure braking and static allocation, the RMSEs of safety (lateral deviation, course angle) and stability indexes (yaw rate, sideslip angle) under proposed controller reduce significantly both in urban and highway accidents. Moreover, the controller performs robust enough against the impact-induced IWM fault. It further supports the effectiveness at dealing with the safety and stability of the ego vehicle after an initial impact and prevent possible MEA.

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“…The details about the coefficient of angular projection ρ can refer to ref. [50]. And it can be interpreted as a lumped energy dissipation within the collision process, which is denoted as:

\begin{equation} \rho =\frac{P_{Y^\prime }}{P_{X^\prime }}.

…”

Section: Modelling and Control Problem Formulationmentioning

confidence: 99%

Advanced post‐impact safety and stability control for electric vehicles

Ao¹,

Zhang

et al. 2022

IET Intelligent Trans Sys

View full text Add to dashboard Cite

show abstract

“…The coefficient of restitution is the negative ratio of the post-impact to the pre-impact vertical velocity at Point C. The impulse ratio is the ratio of the ground plane collision impulse to the vertical direction collision impulse. In some instances, the impulse ratio can be thought of as a coulomb friction value, though its application is not limited to this interpretation [3,4,5,6,17]. In addition to the effects of friction between the ground and the vehicle body, the ground plane impulse may also include the effects of forces generated by snagging between the vehicle and the ground or furrowing of the vehicle into the ground.…”

Section: Impact Model Equationsmentioning

confidence: 99%

The Influence of Vehicle-to-Ground Impact Conditions on Rollover Dynamics and Severity

Rose¹,

Beauchamp²,

Fenton³

2008

SAE Technical Paper Series

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This paper explores the influence of the impact conditions on the dynamics and the severity of rollover crashes. Causal connections are sought between the impact conditions and the crash attributes to which they lead. The paper begins by extending previously presented equations that describe the dynamics of an idealized vehicle-to-ground impact. It then considers the behavior of these equations under a variety of impact conditions that occur during real-world rollovers. Specifically, the equations of this impact model are used to explore the ways in which and the extent to which rollover dynamics and severity are influenced by the following factors: (1) the vehicle's shape and its orientation at impact, (2) its weight, center-of-mass location, and roll moment of inertia, (3) its translational speed, (4) its downward velocity, and (5) its roll velocity. Throughout this discussion, data from real-world and staged rollover crashes is used to give the parameter study an empirical basis.

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“…Two additional equations are derived from the coefficient of restitution (e) [10] and the coefficient of tangential interaction ( ) [11], both of which are assumed known a priori. They are defined below in Eq.…”

Section: Figure 5 a Generic Collision Scenariomentioning

confidence: 99%

Vehicle Dynamics in Response to the Maneuver of Precision Immobilization Technique

Zhou

Lǚ

Peng

2008

ASME 2008 Dynamic Systems and Control Conference, Parts a and B

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The Precision Immobilization Technique (PIT) is a maneuver frequently used by the law enforcement to terminate a hazardous vehicle pursuit situation. The maneuver is performed by intentionally nudging the pursued vehicle sideways to create large yaw motion which renders the pursued vehicle out of control. This work investigates the behavior of vehicles involved in this maneuver, develops dynamics models for the pre-impact, impact, and post-impact stages. Simulation results provide guidelines for the effective execution of the maneuver. In addition, the case for the vehicle equipped with an active yaw control system, such as the Electronic Stability Control, in response to the PIT maneuver is also addressed.

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On the Concept of Inter-Vehicle Friction and Its Application in Automobile Accident Reconstruction

Cited by 9 publications

References 2 publications

Advanced post‐impact safety and stability control for electric vehicles

Advanced post‐impact safety and stability control for electric vehicles

The Influence of Vehicle-to-Ground Impact Conditions on Rollover Dynamics and Severity

Vehicle Dynamics in Response to the Maneuver of Precision Immobilization Technique

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