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Airbag Modelling with LS-DYNA

with Dr. Andre Haufe of DYNAmore GmbH

Duration: 1 Day

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 seminar the principles of airbag modeling, airbag folding, components and materials for airbag models and calibration of a complete airbag model system are discussed. The participants have the possibility to apply their achieved knowledge by several examples.

The seminar is thought for beginners in the field of airbag simulation.

Content:

• 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-Simulationss
• Exercises

Advanced Airbag Simulation with ALE methods in LS-DYNA

with Dr. Andre Haufe of DYNAmore GmbH

Duration: 1 Day

Airbags in motor vehicles cannot always reduce the injury risk of the passengers. Very dangerous situations result from inflating airbags if the passenger is not properly seated (Out-of-Position, OoP). Since the gas flow has a significant influence on the unfolding process and the OoP occupant gets in contact with the airbag in the early unfolding phase it seems reasonable to model the gas flow in detail.

This has led to strong efforts to model the actual physical events with fluid structure coupled models. The approach provided for OoP loading cases in LS-DYNA is based on the Arbitrary-Lagrangian Eulerian (ALE) method.

Content:

• 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
• Examples

In the seminar the basics of the method are explained. It aims to create a recessed appreciation of the complexity of the calculation problem. Knowledge is required from the airbag modeling with control volume technology.

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