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LS-DYNA Rear Impact and Whiplash Simulation Engineering

30 Chapters
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01
Rear impact and whiplash injury mechanisms
biomechanics, kinematics, and regulatory context for LS-DYNA simulation.
whiplashmechanisms
02
LS-DYNA solver fundamentals for crashworthiness
explicit time integration, contact algorithms, and hourglass control.
LS-DYNAcrashworthiness
03
Seat and head restraint modeling
geometry preparation, material definitions, and joint constraints in LS-DYNA.
restraintmodeling
04
BioRID and Hybrid III dummy positioning
LS-DYNA keyword setup, initial conditions, and instrumentation output.
BioRIDIII
05
Sled test setup for rear impact
boundary conditions, acceleration pulses, and correlation with physical tests.
boundaryconditions
06
Mesh generation strategies for seat structures
shell vs. solid elements, mesh density, and quality checks.
generationstrategies
07
Material models for seat foam and trim
low-density foams, viscoelasticity, and strain-rate effects in LS-DYNA.
Materiallow-density
08
Contact definition for dummy-seat interaction
friction, penetration control, and energy balance verification.
definitiondummy-seat
09
Whiplash injury criteria
NIC, Nkm, and IV-NIC implementation in LS-DYNA post-processing.
Whiplashcriteria
10
Rear impact pulse generation
deriving sled pulses from vehicle crash pulses and LS-DYNA boundary prescription.
generationderiving
11
Head restraint geometry optimization
parametric studies and DOE using LS-DYNA and LS-OPT.
restraintgeometry
12
Seatback strength and deformation
modeling recliner mechanisms, yield, and failure in LS-DYNA.
Seatbackstrength
13
Occupant positioning and out-of-position scenarios
LS-DYNA initial belt and airbag interactions.
Occupantpositioning
14
Belt restraint modeling for rear impact
slip rings, retractors, and pretensioners in LS-DYNA.
restraintmodeling
15
Airbag and inflatable restraint simulation
deployment, FSI, and whiplash mitigation in LS-DYNA.
inflatablerestraint
16
Validation of rear impact models
correlating LS-DYNA results with sled and vehicle test data.
Validationcorrelating
17
Sensitivity analysis and robustness
LS-DYNA parametric variation for whiplash injury metrics.
Sensitivityanalysis
18
LS-DYNA implicit vs. explicit for quasi-static seatback strength
solver selection and convergence.
LS-DYNAimplicit
19
Energy absorption of seat structures
LS-DYNA simulations for progressive folding and failure.
absorptionstructures
20
Rear impact with occupant variability
LS-DYNA scaling and morphing for different anthropometries.
occupantvariability
21
Low-speed rear impact and whiplash
LS-DYNA modeling of bumper engagement and vehicle acceleration.
Low-speedwhiplash
22
High-speed rear impact
LS-DYNA simulation of severe whiplash and seatback collapse.
High-speedLS-DYNA
23
LS-DYNA output requests for whiplash
accelerations, angular velocities, and injury criteria history.
LS-DYNArequests
24
Post-processing whiplash metrics
LS-DYNA to LS-PrePost workflows and automated reporting.
Post-processingwhiplash
25
Optimization of head restraint position using LS-DYNA and response surface methods.
Optimization of head restraint position using LS-DYNA and response surface methods.
Optimizationrestraint
26
LS-DYNA simulation of active head restraints
trigger mechanisms and deployment timing.
LS-DYNAsimulation
27
Rear impact compatibility
LS-DYNA modeling of vehicle-to-vehicle and barrier impacts.
compatibilityLS-DYNA
28
Whiplash simulation for rear-seat occupants
LS-DYNA challenges and modeling approaches.
Whiplashsimulation
29
LS-DYNA model calibration using optimization
LS-OPT and genetic algorithms for whiplash.
LS-DYNAcalibration
30
Case study
full LS-DYNA rear impact simulation from model build to whiplash injury assessment.
LS-DYNAsimulation