Thursday, May 27th, 2010
Toyota Motor Corporation (TMC) doesn’t really call it a “Virtual Crash Dummy”, but has announced that the latest version of its THUMS1 virtual human model allows detailed analysis of internal-organ injuries caused by automobile collisions.THUMS
“THUMS” – Total HUman Model for Safety, is a humanoid FE model that can be used to investigate the human body subjected to impact loads. The THUMS model represents a 50 percentile American male in seating position. Human models of different sizes and positions are in preparation.The THUMS model has been developed by Toyota Central R&D, Toyota System Research, and Toyota Motor Company in cooperation with universities and other partners.
THUMS Version 4, of an adult male of average build, adds detailed models of internal organs to the previous version’s models of bones and the brain, enabling analysis of injuries to a wider range of internal organs. Internal organs are particularly vulnerable during collisions, with injuries to them accounting for approximately half of all sustained during automobile collisions. 
To develop Version 4, TMC worked with outside research institutes including universities and utilized a high-precision computed tomography (CT) scanner to make detailed measurements of the internal structure of the human body. By creating precise models of various internal organs, as well as the positions of and relations between those organs, TMC created a virtual human model containing approximately 14 times more information than the previous version. As a result, for analysis of internal injuries, Version 4 can simulate in greater detail how, during a collision, areas of the torso become deformed and internal organs are damaged.

TMC intends to continue to use THUMS for analyzing internal injuries resulting from automobile collisions, applying the results to developing and improving safety devices such as seatbelts and airbags. TMC also plans to add models of a small female and a large male to its virtual-human-model line-up, to enable simulation of a wider range of accident situations.

Toyota Technical Development Corporation, a TMC subsidiary, plans to begin selling THUMS Version 4 in the autumn of 2010.

The body is modelled by considering the shape of individual bones, discretized ligaments and tendons represent the human anatomy perfectly. The model has been validated extensively with cadaver tests and shows a good correlation in different front and side impact scenarios.