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Airbag Inflator Modeling and Gas Flow Simulation

30 Chapters
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01
Airbag inflator system architecture
pyrotechnic, hybrid, and cold-gas designs, component functions, and performance requirements.
inflatorarchitecture
02
Governing equations for inflator gas dynamics
conservation of mass, momentum, and energy in transient compressible flow.
Governingequations
03
Thermochemical modeling of propellant combustion
burn rate laws, equilibrium products, and energy release characterization.
Thermochemicalmodeling
04
Inflator internal ballistics
chamber pressure evolution, nozzle throat flow, and choked flow conditions.
Inflatorinternal
05
Real gas effects and equations of state for high-temperature combustion products in inflator modeling.
Real gas effects and equations of state for high-temperature combustion products in inflator modeling.
equationshigh-temperature
06
Lumped-parameter inflator models
0D thermodynamic formulations, heat loss, and discharge coefficient calibration.
Lumped-parameterinflator
07
One-dimensional gas flow modeling in inflator passages
method of characteristics and shock tube analogies.
One-dimensionalmodeling
08
Computational fluid dynamics for inflator internal flow
mesh generation, turbulence models, and boundary conditions.
Computationaldynamics
09
Multiphase flow in hybrid inflators
helium and combustion gas mixing, and particle-laden flow effects.
Multiphaseinflators
10
Nozzle and diffuser design for inflator efflux
area ratio, thrust, and mass flow rate trade-offs.
diffuserinflator
11
Inflator discharge characterization
tank tests, pressure-time curve measurement, and mass flow rate estimation.
Inflatordischarge
12
Airbag cushion filling dynamics
coupled inflator-cushion modeling, fabric permeability, and venting.
dynamicsinflator-cushion
13
Validation of inflator models against experimental data
tank pressure, schlieren imaging, and PIV measurements.
Validationinflator
14
Sensitivity analysis and uncertainty quantification in inflator performance predictions.
Sensitivity analysis and uncertainty quantification in inflator performance predictions.
Sensitivityanalysis
15
Modeling of inflator ignition and flame propagation
ignition delay, flame speed, and combustion instability.
Modelinginflator
16
Thermal management in inflators
heat transfer to casing, insulation, and autoignition safety.
managementinflators
17
Structural modeling of inflator housing
stress analysis under rapid pressurization and burst pressure prediction.
Structuralmodeling
18
Gas flow through porous media
modeling of filter packs and particulate trapping in inflators.
modelingparticulate
19
Inflator performance under varying ambient conditions
temperature, altitude, and humidity effects.
Inflatorperformance
20
Numerical methods for stiff ODEs and PDEs in inflator simulation
implicit schemes, time integration, and stability.
NumericalODEs
21
Reduced-order modeling and surrogate models for rapid inflator design iterations.
Reduced-order modeling and surrogate models for rapid inflator design iterations.
Reduced-ordermodeling
22
Coupling inflator models with occupant restraint system simulations
MADYMO, LS-DYNA, and co-simulation approaches.
Couplinginflator
23
Design of experiments and optimization for inflator geometry and propellant loading.
Design of experiments and optimization for inflator geometry and propellant loading.
experimentsoptimization
24
Failure mode analysis and safety modeling
overpressure, nozzle blockage, and unintended ignition.
analysismodeling
25
Case study
modeling a pyrotechnic inflator for a driver-side airbag and validating against tank test data.
modelingpyrotechnic
26
Case study
hybrid inflator simulation for a passenger-side airbag with helium and propellant gas mixing.
inflatorsimulation
27
Case study
cold-gas inflator modeling for a side curtain airbag and comparison with pyrotechnic systems.
cold-gasinflator
28
Advanced topics
plasma generation, acoustic effects, and novel propellant formulations in inflator modeling.
Advancedgeneration
29
Regulatory and industry standards for inflator modeling
FMVSS 208, USCAR, and ISO 12097 validation protocols.
Regulatoryindustry
30
Capstone project
end-to-end simulation of an inflator-airbag system, from propellant combustion to cushion deployment, with experimental validation.
Capstoneend-to-end