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Research Papers

Reliability-Based Vehicle Safety Assessment and Design Optimization of Roadway Radius and Speed Limit in Windy Environments

[+] Author and Article Information
Jaekwan Shin

Department of Mechanical
and Aerospace Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: jshin5@ncsu.edu

Ikjin Lee

Assistant Professor
Mechanical Engineering Department,
Korea Advanced Institute of
Science and Technology (KAIST),
Daejeon 305-701, Republic of Korea
e-mail: ikjin.lee@kaist.ac.kr

1Corresponding author.

Contributed by the Design Automation Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received August 19, 2013; final manuscript received April 2, 2014; published online June 2, 2014. Assoc. Editor: Xiaoping Du.

J. Mech. Des 136(8), 081006 (Jun 02, 2014) (13 pages) Paper No: MD-13-1361; doi: 10.1115/1.4027512 History: Received August 19, 2013; Revised April 02, 2014

This paper presents a reliability-based analysis of road vehicle accidents and the optimization of roadway radius and speed limit design based on vehicle dynamics, mainly focusing on windy environments. The performance functions are formulated as failure modes of vehicle rollover and sideslip and are defined on a finite set of basic variables with probabilistic characteristics, so-called random variables. The random variables are vehicle speed, steer angle, tire–road friction coefficient, road bank angle, and wind speed. The probability of accident was evaluated using the first-order reliability method (FORM) and numerical studies were conducted using a single-unit truck model. The analysis demonstrates that wind is a significant factor when assessing vehicle safety on roads, and probabilistic studies such as reliability-based design optimization (RBDO) are necessarily required to enhance vehicle safety in windy environments. Accordingly, design optimization of roadway radius and speed limit was conducted, and new designs were proposed satisfying the target reliability. This study suggests that probabilistic mechanics and theory can be of value for analysis and design of wind-related vehicle safety.

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Figures

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Fig. 1

Schematic diagram of vehicle cornering (top view)

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Fig. 2

Schematic diagram of vehicle cornering (rear view)

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Fig. 3

Comparison between the proposed and existing models

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Fig. 4

Addition of the velocity vectors

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Fig. 5

Influence of design factors on rollover and sideslip criterion: (a) vehicle speed, (b) steer angle, (c) friction coefficient, (d) superelevation and (e) wind speed

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Fig. 6

Wind speed distribution at Lynn

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Fig. 7

Weibull fit of all data

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Fig. 8

Conventional van 5.5T/8.5T model in TruckSim

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Fig. 9

Speed limit design at various reliability levels

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Fig. 10

Milepost range from 243.4 to 244.7 of Interstate I-70 [41]

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