atv safety summit: vehicle tech innovations - computational mechanics for atv safety
DESCRIPTION
Chandrashekhar Thorbole, Director of Thorbole Simulation Technologies presented this at CPSC's ATV Safety Summit Oct. 12, 2012. ATV crashes involving rollovers are mainly governed by factors such as an ATV’s dynamic characteristics, terrain properties, and rider performance. To develop successful safety strategies, ATV crash reconstruction requires detailed crash site surveys and proper understanding of injuries involved, which is often time consuming and costly. Computer simulation technology, widely used in various engineering fields to improve occupant protection features, could be applied to the field of ATV safety. The requirements of an accurate dynamic ATV model, ATD (Anthropomorphic Test Device) models, and terrain environment are essential for any successful ATV crash simulation. In order to successfully conduct sensitivity analysis to understand the most significant factors dictating injury outcomes the ATD must possess bio-fidelity of a bicycle or motorcycle rider, the ability to grip a handle bar, and have a human face profile in order to facilitate correct helmet fit. The Arkansas ATV Safety Research group has developed a computer model of an ATV which can be used to simulate crashes. Future injury simulations will be conducted utilizing a rider and passenger. Pending activities also involve the development of a child rider ATD model for child injury prevention education and the development of applications for testing ATV helmets.TRANSCRIPT
Computational Mechanics for ATV Safety
Chandra Thorbole, Ph.D.
ATV Safety SummitOctober 11th & 12th
Computational Mechanics in Crash Safety
Finite Element Methods
Multibody Dynamics
Occupant Protection
Video
ATV Safety SummitOctober 11th & 12th
Computational Mechanics for ATV Safety
Primary Prevention
Secondary Prevention
Rider Protection
Rollover stability &Handling
Characteristic
Injury Analysis andPrevention
ATV Safety SummitOctober 11th & 12th
ATV Rollover Types
GAO-10-418 Report, “All-Terrain Vehicles-How they are used,crashes,and Sales of Adult-Sized Vehicles for Children’s Use”, April 2010.
ATV Safety SummitOctober 11th & 12th
Real World Accident Research
Rollover Type : Forward Flip
Rider + Passenger
Injury : Neck Injury (Spinal cord involved)
Injury Mechanism : The metal rack impactedthe neck.
ATV Speed 6mph
Front Wheels: Locked
ATV Safety SummitOctober 11th & 12th
Computational Mechanics for ATV Safety
ATV Computer Model
Rider Model
Terrain (Environment)
Model
Successful ATV RiderInjury Prevention
ATV Safety SummitOctober 11th & 12th
Computational Mechanics for ATV Safety
ATV Computer Model
ATV Safety SummitOctober 11th & 12th
Sensitivity Analysis -Evaluation
Initial Speed 10mphDeceleration for soil trip 0.5 sec
Response : Rear Axle Lift
Factors 1. No of people on ATV (Rider ,Passenger)2. Ground Slope3. Rider Grip Hold (Time)
Factor combination (All High Level)
ATV Safety SummitOctober 11th & 12th
Mechanics
Shift the moment about point “a”
Video
ATV Safety SummitOctober 11th & 12th
Evaluation
Video
ATV Safety SummitOctober 11th & 12th
Future Work
Rider Model for Injury Analysis&Helmet effectiveness
ATV Safety SummitOctober 11th & 12th
Thank You