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 that captures the behavior of airbags as part of a simulation of the entire restraint system is essential.
This course illustrates the basics that are 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 also 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. Regarding the latter, particularly the gas loss in seams needs to be included, which will also be discussed in the course. In the past it has been shown that the material behavior has a significant influence on the deployment kinematics, such that the manifold possibilities and more recent implementations in LS-DYNA to define material behavior will need to be discussed in detail.
The course is intended for beginners in airbag simulation. Participants can directly apply their gained knowledge during the seminar via hands-on exercise.
- Introduction to the topic
- Airbag technology
- Design of an airbag system
- Discussion of tank tests and generator characteristics
- Basic principles of airbag simulations 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 mesh (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
|Dates on request|