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  NCJ Number: NCJ 241248     Find in a Library
  Title: Wind-Drag Estimation in a Traffic Accident Involving a Motor Scooter and a Tractor–Trailer
  Document URL: HTML 
  Author(s): Chan-Seong Park, Ph.D. ; Seung-Won Jeon, M.E. ; Kyu-Jung Lee, Ph.D. ; Jun-Suk Kim, M.E. ; Jae-Geun Oh, Ph.D. ; Jong-Chan Park, Ph.D. ; Hong-Seok Lee, Ph.D. ; Young-Shik Choi, Ph.D.
  Journal: Journal of Forensic Sciences  Volume:57  Issue:4  Dated:July 2012  Pages:1108 to 1113
  Date Published: 07/2012
  Page Count: 6
  Annotation: This case report describes a noncontact traffic accident involving a motor scooter and a tractor–trailer with a focus on the wind-drag effect.
  Abstract: This case report describes a noncontact traffic accident involving a motor scooter and a tractor–trailer with a focus on the wind-drag effect. Researchers used load cells to measure the drag force acting on a substantially similar motor scooter when a substantially similar tractor–trailer passes by it, taking into consideration various speeds of the tractor–trailer and distances between the two vehicles. A three-dimensional steady-state flow analysis was also performed by using the CFX program for computational fluid dynamics to examine the streamlines and the pressure distribution around the tractor–trailer at various speeds. From the experiment, for a separation distance of 1.0 m (3.28 ft) and a speed of 90 km/h (55.9 mph), the maximum resultant drag force is 124.5 N (28 lb); this constitutes a degree of force that could abruptly disrupt the stability in maneuvering by an operator who is unaware of the approaching tractor–trailer. In addition, a single equation that relates the tractor–trailer speed to the drag force that acts on the motor scooter was derived on the basis of the Reynolds number (Re) and the wind-drag coefficient (Cd): Cd = 1.298 × 10-7 Re. Abstract published by arrangement with John Wiley & Sons.
  Main Term(s): Forensics/Forensic Sciences
  Index Term(s): Accident investigation ; Closed circuit television (CCTV) ; Motor scooters ; Traffic accidents
  Type: Research (Applied/Empirical)
  Country: United States of America
  Language: English
  To cite this abstract, use the following link:

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