Kent and his six-member team is charged with creating a highly detailed and realistic computer model of the human thorax and upper extremities, including the ribcage, muscles and ligaments, and the lungs and heart.
Jeff Crandall, a professor of mechanical and aerospace engineering and director of U.Va.'s Center for Applied Biomechanics, is leading another team in the development of a virtual pelvis and lower extremities. The Global Human Body Models Consortium recently awarded the two teams $3 million to complete their projects within the next few years.
Teams of researchers at six other universities and institutes are creating models of other parts of the human body, including the head, neck and abdomen.
"Eventually all of these models will be joined together to create the most sophisticated and lifelike simulation of the entire human body ever assembled for safety testing," said Damien Subit, a U.Va. research scientist working on the model of the thorax.
He said the virtual human will be subjected to nearly infinite virtual crash scenarios to determine in graphic detail what happens to organs, bone and tissue when subjected to forces and impacts from a range of angles at different velocities. Researchers will be able to see, in effect, how a neck breaks in a crash, how a lung is punctured by a broken rib or a liver is bruised or a hip shattered.
"We are creating models, based on the actual anatomic details of the human body, that will respond to stress and strain and impact in the same way the actual human body does, so we can see precisely how injuries occur," Kent said. "The ultimate result will be cars with far better safety systems, minimizing the severity of injuries and the frequency of fatalities."
The advantages of a virtual dummy, compared to the typical physical crash test dummy, are huge. Currently, a typical crash test costs about $5,000 to $100,000. A virtual crash will cost nearly nothing – once the dummy is developed. And a regular physical dummy, with a life span of about 10 years, must be repaired after each crash. A virtual dummy will be, in a sense, immortal, and could be used repeatedly in a far wider range of crash scenarios.
Current physical dummies are built in only three height and weight models, representing an approximation of the many sizes of humans. The virtual dummy eventually will be configured in variable sizes and weights, representing the true range of human body types.
"This will be an adaptable, cost-saving system that will provide amazing insight to body injuries for improving auto safety," Kent said.
He added that the virtual dummy could be useful in other ways as well, such as for the design of safer sporting goods, and in medical schools for students studying trauma injuries.
Source: University of Virginia
A simple example of seatbelt pressure on the thorax. University of Virginia engineers will design complex computational models of the thorax and pelvis regions for an eventual virtual crash test dummy.
(Photo Credit: University of Virginia Center for Biomechanics)