LS-DYNA Airbag and Seatbelt Parameter Tuning 30 Cases - English Technical Courses - 014-DFMEA DVP&R & DRBFM for Occupant Restraints

Build a Baseline Frontal Airbag Deployment Model

Assemble a validated LS-DYNA occupant-restraint model with a driver airbag, seatbelt, and simplified Hybrid III dummy, then run a frontal 50 km/h impact to establish baseline injury metrics for subsequent parameter tuning.

BaselineDeployment

02

Tune Airbag Vent Hole Area for Occupant Chest Deflection

Parametrically vary vent hole area in the airbag fabric material and measure chest deflection response to identify the vent size that minimizes deflection without causing bottom-out.

OccupantDeflection

03

Calibrate Mass Flow Rate of the Inflator

Adjust the inflator mass flow rate curve in the airbag definition to match a target bag pressure-time history and evaluate the effect on occupant head acceleration.

CalibrateInflator

04

Optimize Seatbelt Webbing Stiffness for Chest Compression

Modify the seatbelt webbing force-strain curve and run a design-of-experiments study to find the stiffness that reduces chest compression while maintaining acceptable forward excursion.

OptimizeSeatbelt

05

Tune Seatbelt Pretensioner Force Profile

Vary the pretensioner force-time curve to reduce occupant forward displacement and assess the trade-off with chest loading in a frontal impact.

SeatbeltPretensioner

06

Adjust Load Limiter Force Level for Occupant Protection

Change the seatbelt load limiter force threshold and evaluate its influence on chest deflection and head excursion across multiple impact speeds.

OccupantProtection

07

Set Airbag Trigger Time for Out-of-Position Occupant

Determine the airbag deployment trigger time that minimizes injury risk for a 5th percentile female occupant positioned close to the steering wheel.

Out-of-PositionOccupant

08

Tune Airbag Fabric Permeability for Pressure Decay

Vary fabric permeability in the airbag material model to control pressure decay and assess its effect on occupant rebound velocity and chest loading.

PermeabilityPressure

09

Calibrate Airbag Initial Gas Temperature and Pressure

Adjust the initial gas temperature and pressure in the airbag chamber to match a target bag inflation curve and evaluate the sensitivity of occupant head acceleration.

CalibrateTemperature

10

Optimize Seatbelt Anchor Point Locations

Move the seatbelt anchor points within feasible ranges and run a parametric study to minimize chest deflection while avoiding belt slip-off.

OptimizeSeatbelt

11

Tune Airbag Fold Pattern for Deployment Kinematics

Compare two airbag fold patterns and adjust the folding parameters to achieve a consistent deployment shape that reduces occupant head rotation.

DeploymentKinematics

12

Adjust Seatbelt Retractor Locking Time

Vary the retractor locking time in the seatbelt model and measure its effect on occupant forward excursion and belt force in a frontal crash.

SeatbeltRetractor

13

Tune Airbag Vent Strap Release Timing

Modify the vent strap release time to control bag pressure at peak occupant loading and evaluate the resulting chest deflection and head acceleration.

pressureoccupant

14

Calibrate Seatbelt Slip Ring Friction

Adjust the friction coefficient at the seatbelt slip ring and assess its influence on belt force distribution and occupant chest compression.

CalibrateSeatbelt

15

Optimize Airbag Module Cover Tear Seam

Vary the tear seam strength in the airbag module cover to ensure consistent deployment without fragmenting, and evaluate its effect on occupant injury metrics.

Optimizestrength

16

Tune Seatbelt Pretensioner Stroke Length

Change the pretensioner stroke length and measure occupant forward displacement and chest loading to find an optimal stroke for a given impact pulse.

SeatbeltPretensioner

17

Adjust Airbag Inflation Curve for Small Overlap Impact

Modify the airbag inflation curve to improve occupant protection in a small overlap frontal impact and compare injury metrics with the baseline.

Inflationoccupant

18

Tune Seatbelt Force Limiter for Oblique Impact

Optimize the load limiter force level for an oblique impact scenario and evaluate occupant chest deflection and head excursion.

SeatbeltOptimize

19

Calibrate Airbag Contact Stiffness with Occupant

Adjust the airbag-to-occupant contact stiffness in the LS-DYNA contact definition to better match physical test data and assess its effect on head acceleration.

CalibrateStiffness

20

Optimize Seatbelt Routing for Comfort and Protection

Modify the seatbelt routing path to reduce occupant chest compression while maintaining proper belt fit, and verify with a frontal impact simulation.

OptimizeSeatbelt

21

Tune Airbag Vent Hole Location

Relocate vent holes on the airbag surface and evaluate the resulting pressure distribution and occupant chest deflection to identify an optimal location.

LocationRelocate

22

Adjust Seatbelt Webbing Preload

Apply a preload to the seatbelt webbing and measure its effect on occupant forward excursion and chest loading in a frontal crash.

Seatbeltoccupant

23

Calibrate Airbag Gas Inflow Temperature

Vary the inflator gas temperature and assess its influence on bag pressure history and occupant head acceleration.

CalibrateTemperature

24

Tune Seatbelt Buckle Pretensioner Force

Modify the buckle pretensioner force profile and evaluate occupant chest deflection and forward displacement.

SeatbeltPretensioner

25

Optimize Airbag Tether Length for Deployment Shape

Adjust internal tether lengths to control airbag deployment shape and reduce occupant head rotation in a frontal impact.

OptimizeDeployment

26

Tune Seatbelt Load Limiter for Rear Seat Occupant

Optimize the load limiter force for a rear-seat occupant and compare injury metrics with the front-seat baseline.

SeatbeltOccupant

27

Calibrate Airbag Venting for Pressure Relief

Adjust venting parameters to achieve a target pressure relief curve and evaluate occupant chest deflection and rebound velocity.

CalibratePressure

28

Optimize Seatbelt Anchor Stiffness

Vary the stiffness of the seatbelt anchor points and assess their effect on belt force and occupant chest compression.

OptimizeSeatbelt

29

Tune Airbag Deployment for Out-of-Position Child

Adjust airbag deployment parameters to minimize injury risk for a child dummy positioned close to the instrument panel.

DeploymentOut-of-Position

30

Calibrate Seatbelt Retractor Force Limit

Modify the retractor force limit and evaluate its influence on occupant forward excursion and chest loading in a frontal impact.

CalibrateSeatbelt