Speed from Skids: A Modern Approach

Neptune, James A.; Flynn, James E.; Chavez, Philip A.; Underwood, Howard W.

doi:10.4271/950354

Cited by 20 publications

(5 citation statements)

References 2 publications

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“…(1) is the braking initial velocity, unit: m / s; φ is the tire / road adhesion coefficient; i is the road gradient (%); S is the length of the braking trace, the unit: m. Use Neptune model [7] for solving vehicle the braking speed:…”

Section: The Analysis Methods According To Braking Tracesmentioning

confidence: 99%

Dynamics applications in the vehicle and two-wheeler accidents

Ni¹

2016

Proceedings of the 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnolog

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Conflicts between the parties have been increased due to multiple accidents between vehicles and two-wheelers. The main problem lies to the responsibility identification in the accident. Speed collision by applying to scientific and accurate accident reconstruction is an important part for the responsibility identification in an accident. Thus, the different forms of accident analysis is of great significance for improving the handling level in accidents. In the research on analysis methods in the accident between vehicles and bicycles, the braking traces, the throw distance models of the rider and the bike, as well as the throw distance fallout will be analyzed.

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Section: The Analysis Methods According To Braking Tracesmentioning

confidence: 99%

Dynamics applications in the vehicle and two-wheeler accidents

Ni¹

2016

Proceedings of the 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnolog

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“…As can be seen in figures 6 and 7, braking data derived from published road tests, are free from any transient braking phase. As a consequence, it must be observed that when determining the drag factor, the transient process must be excluded from the calculation of average deceleration; when calculating pre-impact speed, it must be taken into account [13].…”

Section: Measuring Vehicular Deceleration With Accelerometersmentioning

confidence: 99%

Evaluation of emergency braking deceleration for accident reconstruction

Vangi

Virga

2007

Vehicle System Dynamics

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“…However, even in its original intended use to back-estimate vehicle speed from skidding, several limitations do exist and have been mentioned by past studies. For instance, Neptune, Flynn, Chavez, and Underwood (1995) noted on such a limitation that the formula does not account for the energy converted to work during the transient portion of the braking process. Consequently, a more accurate estimation that considered the pre-skidding braking was proposed, but the improved estimation was still generally based on the simplistic formula (Neptune et al, 1995).…”

Section: Skid Mark and Accident Reconstructionmentioning

confidence: 99%

“…For instance, Neptune, Flynn, Chavez, and Underwood (1995) noted on such a limitation that the formula does not account for the energy converted to work during the transient portion of the braking process. Consequently, a more accurate estimation that considered the pre-skidding braking was proposed, but the improved estimation was still generally based on the simplistic formula (Neptune et al, 1995). Meanwhile, more recent researches have the focus on braking distance estimation instead due to the development of some active safety systems like the collision avoidance system.…”

Section: Skid Mark and Accident Reconstructionmentioning

confidence: 99%

Heavy Vehicle Multi-Body Dynamic Simulations to Estimate Skidding Distance

Zamzamzadeh

Saifizul

Ramli

et al. 2018

The Baltic Journal of Road and Bridge Engineering

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Abstract. The skid mark is valuable for accident reconstruction as it provides information about the braking behaviour drivers and the speed of heavy vehicles. However, despite its importance, there is currently no mathematical model available to estimate skidding distance (SD) as a function of vehicle characteristics and road conditions. This paper attempts to develop a non-linear regression model that is capable of reliably predicting the skidding distance of heavy vehicles under various road conditions and vehicle characteristics. To develop the regression model, huge data sets were derived from complex heavy vehicle multi-body dynamic simulation. An emergency braking simulation was conducted to examine the skidding distance of a heavy vehicle model subject to various Gross Vehicle Weight (GVW) and vehicle speeds, as well as the coefficient of friction of the road under wet and dry conditions. The results suggested that the skidding distance is significantly affected by Gross Vehicle Weight, speeds, and coefficient of friction of the road. The improved non-linear regression model provides a better prediction of the skidding distance than that of the conventional approach thus suitable to be employed as an alternative model for skidding distance of heavy vehicles in accident reconstruction.

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Speed from Skids: A Modern Approach

Cited by 20 publications

References 2 publications

Dynamics applications in the vehicle and two-wheeler accidents

Dynamics applications in the vehicle and two-wheeler accidents

Evaluation of emergency braking deceleration for accident reconstruction

Heavy Vehicle Multi-Body Dynamic Simulations to Estimate Skidding Distance

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