Airbag Particle Method (APM)
Instructor
- Alexander Gromer
Airbag Particle Method (APM)
Prerequisites
- You should have a basic knowledge of LS-DYNA®.
Syllabus
This class first presents the fundamentals to create an airbag model in LS-DYNA. We will give a brief overview of the uniform pressure (UP) approach. Then we will introduce the theoretical background and implementation of the newer airbag particle method (APM). This latter method is based on a particle approach using molecular kinetic theory and has become state-of-the-art for all airbag applications due to its high accuracy, numerical robustness, and efficiency.
Besides the description of *AIRBAG_PARTICLE, as well as the related keywords regarding definition of the control volume, number of particles, definition of vents, gas properties, etc., we will discuss further modeling aspects affecting the airbag’s behavior. We will present state-of-the-art techniques as well as most recent implementations in LS-DYNA with their influence on the deployment behavior.
Content
-
Introduction
- Basics
- Different aspects of airbag modeling in LS-DYNA
-
UP method
- Available keywords related to different UP models in LS-DYNA
- Wang-Nefske approach, hybrid gas generators, & jetting definition for UP airbag models
- Available keywords & application of APM in LS-DYNA
- Merits & limits of UP modeling
-
APM
- Influence of different parameters on the airbag’s behavior
- Merits & limits of APM modeling
-
Material definition & reference geometry
- Definition & influence of a reference geometry
- Material definition using *MAT_FABRIC (non-linearity, anisotropy, porosity, & validation)
- Contact definition & folding simulation
-
Model set-up
- Modeling advice regarding APM airbag models
- Discussion of tank tests & airbag validation
- Process chain for airbag modeling
- Post processing of results
- Examples