FWF - Imp. Injury Criteria for Children - Development of Improved Injury Criteria for the Children

  • Ciglaric, Iztok, (Co-Investigator (CoI))

Project: Research project

Description

Each year, 700 children are killed on European roads and 80,000 are injured. It represents an unacceptably high
burden on Europe's society and economy. The fact that such poor results are observed, despite normal use of CRS
(Child Restraint Systems) complying with the ECE 44 Regulation, underlines the high social importance of
continued child safety research. The European Commission (EC) as well as National Highway Traffic Safety
Administration's (NHTSA) plan for upgrading the existing directives and legislation for frontal and side crash
protection safety including additional requirements that will specify performance limits to minimize the risks from
injuries to small sized occupants and children in both normal and out-of-position seating locations. These new
crash specifications will require the use of additional dummies of various sizes as well as improved injury criteria
that will appropriately represent injury thresholds of these population segments. Plan for upgrading existing
legislation based on new improved consumer tests and results from these tests that are available for public and
publish by various organizations all over the world.
Existing Injury Criteria are developed on extensive analysis, for limited size dummy (e.g., an adult like dummy).
By using different techniques, scientists try to applied and adopt existing Injury Criteria to other size dummies
(e.g., a child like dummy). At the moment two techniques - statistical analysis and scaling - are used in developing
appropriate Injury Criteria for different (non-standard) dummy size. As usually necessary data for Injury Criteria
development can be collected only for a specific type of vehicle occupant under a given loading condition, (e.g., an
adult male or female) statistical analysis is limited for some type of occupants. This is clearly evidenced by the lack
of biomechanical data available for children. Under these circumstances scaling techniques and engineering
judgment is the only approach to develop injury criteria for other size occupants. The type of scaling most
commonly used at the moment is dimensional analysis. For mechanical systems this technique allows the unknown
physical responses of a given system to be estimated from the known responses of a similar system by establishing
fundamental scaling factors that are based on ratios between fundamental properties that characterize the two
systems.
In this project detailed acquisition of geometrical data and in addition acquisition of some inertial data over
children population between age 4 and 14 will be considered to improve understanding of the influence of these
mechanical data on children body dynamic response and injury potential during impact. Dynamic response and
injury potential will be studied by using new scaling methods, based on sensitivity analysis and measured data
applied to available numerical models of child body and selected existing Injury Criteria. We hypothesize that new
scaling techniques will provide more complex and realistic insight how different mechanical parameters variation
influence the dynamic response and Injury Criteria and therefore make scaling more realistic. We also hypothesize
new scaling method based on sensitivity analysis along with measured data will make possible to considerably
improve biomechanical properties of children numerical model and also improve the use of existing Injury Criteria
when addressing children injury potential. Improved children numerical model and improved use of Injury Criteria
will represent an important tool for evaluating vehicle safety equipment in the future.
StatusFinished
Effective start/end date1/06/0630/04/08