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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August 2014
Research-Article
Reliability-Based Vehicle Safety Assessment and Design Optimization of Roadway Radius and Speed Limit in Windy Environments
Jaekwan Shin,
Jaekwan Shin
Department of Mechanical
and Aerospace Engineering,
e-mail: jshin5@ncsu.edu
and Aerospace Engineering,
North Carolina State University
,Raleigh, NC 27695
e-mail: jshin5@ncsu.edu
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Ikjin Lee
Ikjin Lee
1
Assistant Professor
Mechanical Engineering Department,
e-mail: ikjin.lee@kaist.ac.kr
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.
Search for other works by this author on:
Jaekwan Shin
Department of Mechanical
and Aerospace Engineering,
e-mail: jshin5@ncsu.edu
and Aerospace Engineering,
North Carolina State University
,Raleigh, NC 27695
e-mail: jshin5@ncsu.edu
Ikjin Lee
Assistant Professor
Mechanical Engineering Department,
e-mail: ikjin.lee@kaist.ac.kr
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. Aug 2014, 136(8): 081006 (13 pages)
Published Online: June 2, 2014
Article history
Received:
August 19, 2013
Revision Received:
April 2, 2014
Citation
Shin, J., and Lee, I. (June 2, 2014). "Reliability-Based Vehicle Safety Assessment and Design Optimization of Roadway Radius and Speed Limit in Windy Environments." ASME. J. Mech. Des. August 2014; 136(8): 081006. https://doi.org/10.1115/1.4027512
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