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2008 ARC-CSI Crash Conference
June 2-5, 2008
Las Vegas, NV
Palace Station Hotel
Approved for 27 ACTAR CEU's
Airborne Analysis with Rotational Mechanics
by Nathan S. Shigemura
The concepts of uniform projectile motion and how they relate to objects in flight, traveling through a ballistic trajectory will be discussed. The application of uniform projectile motion to speed determination is discussed. A single equation applicable to all airborne situations is developed and presented. Concepts in rotational mechanics will also be presented. A case study will be examined where the question was “did the vehicle go airborne or just roll down the hill?” The solution presented will show how techniques in airborne analysis and rotational mechanics were utilized to determine the speed at which the vehicle will go airborne and thus answer the question.
Bio
Nathan Shigemura retired in 2002 as a sergeant from the Illinois State Police, where his duties included crash investigation instructor, traffic crash reconstructionist and supervisor of the statewide Traffic Crash Reconstruction Unit.
Mr. Shigemura is certified as an accident reconstructionist by the State of Illinois and holds full accreditation as a traffic accident reconstructionist from the Accreditation Commission for Traffic Accident Reconstruction (ACTAR). He is co-owner and traffic crash reconstructionist of the Traffic Safety Group, LLC, a traffic crash reconstruction and analysis company based in Illinois.
Since 1989, he has been an adjunct faculty member of the Institute of Police Technology and Management (IPTM), for whom he teaches courses in all levels of traffic crash investigation and reconstruction worldwide.
Prior to joining the Illinois State Police, Mr. Shigemura, who holds a Bachelor of Science degree in Electrical and Electronic Engineering (BSEE) from the University of Illinois, Chicago (1975), was employed as a Hardware/Software Design Engineer for GTE Automatic Electric.
Mr. Shigemura is a member and past president of Illinois Association of Technical Accident Investigators (IATAI) and is an active member of the Society of Automotive Engineers (SAE) and the Fraternal Order of Police.
Mr. Shigemura is the author of Mathematics for the Traffic Accident Investigator and Reconstructionist, published by IPTM in 1996, coauthor (with John Daily) of Fundamentals of Applied Physics for Traffic Accident Investigators (Volume 1 of the Traffic Accident Reconstruction Series), published by IPTM in 1997, coauthor (with John Daily & Jeremy Daily) of Fundamentals of Traffic Crash Reconstruction – 2nd Ed. (Volume 2 of the Traffic Accident Reconstruction Series), published by IPTM in 2006, and coauthor (with Andrew Rich) of Balancing Collision Forces in Crush/Energy Analyses, published by IPTM in 2008.
He has presented at numerous conferences and seminars and has testified as an expert in depositions as well as state and federal court.
