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Occupant Restraint CAE Simulation and Physical Test Correlation

30 Chapters

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Course overview

occupant restraint system fundamentals, CAE simulation role, physical test correlation objectives, and course roadmap.

occupantrestraint

Restraint system components and working principles

seat belts, airbags, pretensioners, load limiters, child restraint systems, and their interaction with occupants.

Restraintcomponents

Regulatory and consumer rating requirements

FMVSS, ECE, C-NCAP, Euro NCAP, and other standards governing occupant protection and test protocols.

Regulatoryconsumer

CAE simulation workflow for occupant restraint

model setup, boundary conditions, initial conditions, and solver selection for crash and occupant simulations.

Occupant dummy models

finite element and multibody dummy models (Hybrid III, THOR, WorldSID, Q-series), validation status, and appropriate use cases.

Occupantmultibody

Restraint system modeling techniques

seat belt routing, slip rings, retractor and pretensioner modeling, airbag folding and deployment, and contact definitions.

Restraintmodeling

Material and component characterization for restraint CAE

strain-rate-dependent materials, fabric properties, airbag inflator characteristics, and test-derived parameters.

Materialcomponent

Physical test setup for occupant restraint

sled tests, full-scale crash tests, dummy instrumentation, high-speed imaging, and data acquisition.

Physicaloccupant

Correlation metrics and validation methodology

objective rating methods (CORREL, ISO/TS 18571), signal analysis, and acceptance criteria.

Correlationvalidation

Belt restraint correlation

comparing simulation and test for belt forces, dummy kinematics, and chest deflection in frontal impact.

restraintcorrelation

Airbag deployment correlation

matching deployment timing, pressure curves, bag shape, and occupant interaction between CAE and test.

deploymentcorrelation

Frontal impact restraint correlation

full system validation for driver and passenger occupants in 50 km/h full frontal and offset deformable barrier tests.

restraintcorrelation

Side impact restraint correlation

door trim, side airbag, and curtain airbag interaction with ES-2re and SID-IIs dummies in barrier and pole tests.

restraintcorrelation

Rear impact and whiplash correlation

seat and head restraint modeling, BioRID dummy validation, and neck injury criteria correlation.

whiplashcorrelation

Child restraint system (CRS) correlation

CRS modeling, ISOFIX/latch attachments, Q-series dummy validation, and frontal/side impact test correlation.

Out-of-position (OOP) occupant simulation and correlation

airbag interaction with OOP occupants, suppression systems, and static deployment tests.

Out-of-positionOOP

Sensitivity analysis and robustness assessment

identifying key parameters affecting correlation, DOE methods, and tolerance allocation.

Sensitivityanalysis

Model updating and calibration techniques

using test data to adjust CAE parameters, optimization methods, and validation loop closure.

updatingcalibration

Correlation for advanced restraint systems

adaptive load limiters, motorized pretensioners, and integrated safety systems in simulation and test.

Correlationadvanced

Occupant restraint CAE in vehicle development

role in design iterations, virtual prototyping, and sign-off processes.

Occupantrestraint

Correlation challenges and best practices

common pitfalls, model fidelity issues, test variability, and strategies for successful correlation.

Correlationchallenges

frontal offset crash correlation for a passenger car – from sled test to full vehicle validation.

correlationpassenger

side pole impact correlation with curtain airbag and far-side occupant protection.

correlationfar-side

rear-seat occupant restraint correlation in frontal impact with belt load limiter and pretensioner.

rear-seatoccupant

child restraint system correlation in side impact using Q3 dummy and door-mounted airbag.

restraintcorrelation

OOP occupant correlation for passenger airbag deployment using static and dynamic tests.

Integration of CAE correlation into safety target setting and regulatory compliance demonstration.

Integration of CAE correlation into safety target setting and regulatory compliance demonstration.

Data management and traceability in correlation projects

test data formats, version control, and documentation.

managementtraceability

Emerging trends

virtual testing, human body models, and AI-assisted correlation for occupant restraint systems.

EmergingAI-assisted

Capstone project

end-to-end correlation of an occupant restraint system – from model setup and test data analysis to validation report.

Capstoneend-to-end