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Airbag Inflation Testing and CAE Model Correlation

30 Chapters
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01
Airbag inflation testing and CAE correlation
course scope, engineering objectives, and the role of physical testing in restraint system development.
inflationCAE
02
Airbag system architecture
driver, passenger, side, curtain, and knee airbags; inflator types; module construction; and deployment-relevant interfaces.
architecturepassenger
03
Inflation physics fundamentals
gas generation, pyrotechnic and hybrid inflators, mass flow rate, pressure-volume-temperature behavior, and venting.
Inflationgeneration
04
Regulatory and consumer-test requirements
FMVSS 208, ECE R94/R95, Euro NCAP, and out-of-position (OOP) test protocols that drive inflation correlation.
Regulatoryconsumer-test
05
Test article and fixture design
static deployment rigs, sled setups, body-in-white fixtures, and boundary conditions that influence inflation response.
deploymentbody-in-white
06
Instrumentation for inflation testing
pressure transducers, load cells, accelerometers, high-speed cameras, and data acquisition synchronization.
Instrumentationinflation
07
High-speed imaging and photogrammetry
frame rates, lighting, tracking markers, and 3D deformation extraction for airbag deployment.
High-speedphotogrammetry
08
Inflator characterization testing
tank tests, closed-vessel pressure measurements, mass flow rate derivation, and gas temperature estimation.
Inflatorcharacterization
09
Airbag fabric and seam characterization
permeability, tensile and tear testing, seam strength, and material models for CAE input.
characterizationpermeability
10
CAE model setup for airbag inflation
uniform pressure (UP) method, control volume (CV) method, and corpuscular particle method (CPM).
CAEinflation
11
Inflator modeling in CAE
mass flow rate curves, temperature inputs, gas species, and mapping tank test data to simulation.
Inflatormodeling
12
Airbag folding and initial state modeling
fold patterns, pre-simulation, mesh generation, and mapping folded geometry into the solver.
modelingpatterns
13
Fluid-structure interaction (FSI) in airbag simulation
ALE, CEL, and particle-based approaches; coupling strategies and computational cost.
Fluid-structureinteraction
14
Contact and penetration handling
airbag-to-occupant, airbag-to-interior, self-contact, and numerical stability during deployment.
penetrationhandling
15
Occupant positioning and OOP simulation
initial kinematic conditions, seat position, and ATD positioning for correlation with OOP tests.
Occupantpositioning
16
Test data processing for correlation
filtering, baseline correction, synchronization, and extraction of pressure, acceleration, and displacement histories.
processingcorrelation
17
CAE model correlation metrics
peak value, time-to-peak, pulse duration, energy, and statistical measures like CORA and ANOVA.
CAEcorrelation
18
Inflator model calibration
adjusting mass flow rate, temperature, and burn characteristics to match tank and airbag pressure data.
Inflatorcalibration
19
Fabric and seam model calibration
tuning permeability, stiffness, damping, and failure criteria against material and deployment tests.
calibrationpermeability
20
Venting and leakage calibration
vent hole size, fabric porosity, and seam leakage effects on pressure decay and occupant loading.
calibrationporosity
21
Occupant restraint interaction
airbag pressure vs. occupant kinematics, chest deflection, head acceleration, and injury criteria correlation.
Occupantrestraint
22
Sled test correlation
full-scale sled tests with airbag deployment, occupant response, and CAE model validation for crash pulses.
correlationfull-scale
23
Static deployment correlation
airbag deployment into free space and against rigid walls; pressure and shape correlation.
deploymentcorrelation
24
OOP correlation
out-of-position occupant scenarios, airbag interaction with ATD, and model sensitivity to positioning and timing.
OOPcorrelation
25
Side airbag and curtain airbag correlation
unique challenges in inflation, packaging, and interaction with interior trim.
correlationchallenges
26
Sensitivity analysis and uncertainty quantification
identifying key parameters, tolerance effects, and robust design of airbag systems.
Sensitivityanalysis
27
Optimization and DOE in airbag CAE
design of experiments, response surface methods, and multi-objective optimization for inflation performance.
OptimizationDOE
28
Advanced material modeling
anisotropic fabrics, strain-rate effects, temperature dependence, and failure modeling for airbag materials.
Advancedmaterial
29
Numerical stability and solver settings
time step, mass scaling, contact controls, and debugging common airbag simulation errors.
Numericalstability
30
Case study
end-to-end correlation project for a driver airbag system, from test setup and data acquisition to CAE model validation and reporting.
end-to-endcorrelation