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Citation
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Putzer M, Adamou FEN, Zhu F, Walz M, Galazka J. 27th International Technical Conference on the Enhanced Safety of Vehicles (ESV); April 3-6, 2023; Abstract #: 23-0220-W, pp. 9p. Washington, DC USA: US National Highway Traffic Safety Administration, 2023 open access. |
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Abstract
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27th International Technical Conference on the Enhanced Safety of Vehicles (ESV): Enhanced and Equitable Vehicle Safety for All: Toward the Next 50 Years
https://www-esv.nhtsa.dot.gov/Proceedings/27/27ESV-000220.pdf
Finite element models of crash test dummies are extensively used throughout the development process of new cars. Each model has to go through various validation steps to meet user- or manufacturer-defined quality requirements. However, there is no standardized process established to qualify a model for a specific virtual testing application in general. A consumer rating organization intends to include virtual testing in their rating protocol. The pilot use case will be a far side impact using the WorldSID 50th. Virtual testing requires validated models of environment, restraint systems, and dummy but there is no standard available to determine the level of validation. This paper presents the work of an ACEA working group that developed a process to qualify WorldSID 50th dummy models for the use in a far side virtual testing application. The validation processes including validation data of different WorldSID 50th models were reviewed. A multilevel procedure covers general properties, fundamental dynamic behaviour and application specific loadings. The assessment is based on pass/fail criteria as well as on objective rating methods. For final confirmation of the methodology four state of the art models and an artificially degraded model were used. The designed process comprises three levels that need to be passed. It is only valid for applications that have very similar load levels and load patterns (reference application). The first level checks general properties of the model against the hardware. It includes drawing conformity, external dimensions, range of motion of joints and mass properties. The second level checks the fundamental dynamic behaviour of the model. The model must pass all qualification requirements. The third level is derived from the reference application. It checks the performance of the most important components (body segments) and of the whole dummy. The boundary conditions of these checks are derived from the reference application. The relevant dummy signals are assessed by using the objective rating method defined in ISO/TS 18571 [1]. All signal scores are weighted and combined to a total rating. The assessed responses cover kinematics as well as internal loads. The model must achieve a minimum total rating score to pass this third level. A model is validated or qualified for the virtual testing application if all three levels are passed successfully. Putzer 1 The far side application requires a dynamic assessment of lumbar spine and neck. An additional sled test with a simplified vehicle environment evaluates the performance of the whole dummy model. The process offers the opportunity to assess the level of validation based on objective criteria. It can distinguish between different levels of validation. The process provides a method to qualify models for use in virtual testing based on objective parameters and rating schemes. It might become a standardized method to qualify the WorldSID 50th model as one component to introduce virtual testing.
Language: en |