1994-03-01

Delta-V: Basic Concepts, Computational Methods, and Misunderstandings 940915

Vehicle crush deformation and energy equivalence relationships are widely accepted as technical accident reconstruction tools for estimating the change in velocity (Delta-V) during an impact. Delta-V has been accepted as a basis for evaluating damage severity and potential injury severity. Emori, Campbell and McHenry's work led to CRASH derivative type programs which are based upon a relationship between crush magnitude and Delta-V. SMAC derivative type programs utilize these principles while generating a time dependent analysis (simulation) by maintaining a continuous equalization of forces between the vehicles during the impact phase. This paper reviews basic principles and the relationships between Delta-V, kinetic energy, conservation of momentum, and barrier equivalent velocity which must be adhered to while performing this type of analysis. Several examples and frequently seen misunderstandings of these relationships are discussed. This paper is intended to assist not only the unseasoned reconstructionist in developing an understanding for Delta-V, but is also intended for the seasoned reconstructionist to assist in demonstrating that their application and interpretation of Delta-V is correct.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Image Analysis of Rollover Crash Tests Using Photogrammetry

2006-01-0723

View Details

TECHNICAL PAPER

Essential Considerations in Delta-V Determination

2001-01-3165

View Details

TECHNICAL PAPER

Occupant Injury in Motor Vehicle Collisions: Using Field Accident Data from Multiple Sources

2009-01-0394

View Details

X