Introduction to Airbag Modeling
Today, airbags are one of the most important components of a motor vehicle's occupant protection system. In addition to the standard airbags for the driver and front passenger, an increasing number of specialized airbag variants, such as curtain airbags, kneebags, etc., are used. Each airbag must be specifically designed and optimized for its intended purpose . A sensible and comprehensive simulation of airbag behavior as part of a simulation of the entire restraint system is indispensible.
This course teaches the basics required to set up an airbag simulation in LS-DYNA. In addition to the deployment technology per se, which can in principle be based on the uniform pressure approach or the more recent corpuscular method, this includes the selection of the inflow method (Wang-Nefske or hybrid approach, etc.) as well as the verification and validation of the associated inflow data. Moreover, the deployment behavior is also determined by the correct adjustment of contact, discharge opening and porosity parameters. As regards the latter, gas loss in seams is to be noted in particular and will be discussed in the course. In the past it was also found that the material behavior has a significant influence on the deployment kinematics, so that the manifold possibilities and more recent implementations in LS-DYNA to define material behavior will need to be discussed at length. In exercise examples, course participants can apply the knowledge gained during the course.
- Introduction to the topic
- Airbag technology: Design of an airbag system; discussion of tank test and generator characteristic
- Fundamentals: Fundamental terms of airbag computation with LSDYNA;
- Uniform pressure methods in LS-DYNA with Wang-Nefske formulation and hybrid inflators; possibilities and limits of UP deployment calculations; corpuscular method
- Model composition: Syntax of model structure; folding of airbags; generation of a reference network (initial metric or reference geometry); possibilities of material definition (nonlinearities, orthotropy, porosity) and validation; surrogate models for tether straps, heat shield, tear seams; surrogate models for discharge openings; jetting definition for UP airbag models; discussion of an LS-DYNA airbag model (UP and corpuscular method); presentation of the process chain for model configuration
- Airbag validation and evaluation of results
The course is intended for beginners in airbag simulation.
|Dates on request|