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Airbag Modelling with LS-DYNA

Duration: 2 Days

Nowadays airbags are one of the most important components for the realization of occupant safety. Beside of the standard airbags for driver and passenger recently there are many more special airbag versions available. Each airbag has to be specified and validated for its particular purposes. For this a reliable and accurate simulation of the airbag properties is essential.

In the training the principles of airbag modeling, airbag folding, components and materials for airbag models and calibration of a complete airbag model system and dealing with OOP (Out-of-Position) case are discussed. The participants have the possibility to apply their achieved knowledge by several examples.

This training is suitable for both beginners as well as engineers with prior experience working with airbags.

Day 1

• Introduction
• Airbag technology
• How does an airbag work?
• Tank test
• Inflator types
• Basics
• Control volume approach
• Wang-Nefske formulation
• Possibilities and limits
• Syntax and fundamental terms of airbag simulations with LS-DYNA
• Modeling
• Folding of airbags
• Generation of an initial metric
• Surrogate model for leakage
• Jetting
• Composition of a complete LS-DYNA model
• Evaluation of the results of an airbag simulation
• Calibration of an airbag model
• Overview of alternative approaches for Out-Of-Position-Simulations

Day 2

• Overview and necessity of ALE models for the explosion of airbag
• Theoretical fundamentals
• Possible gas models
• Inflow definition
• Initialization of the model
• Coupling methods
• Leakage control
• Consideration of porosity
• Material
• Contact definition
• Overview and necessity of Particle methods
• Theoretical fundamentals
• Inflow definition
• Initialization of the model
• Consideration of porosity
• Exercises/ workshops

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