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MADYMO Hybrid Multibody-FE Occupant Simulation

30 Chapters

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MADYMO hybrid multibody-FE occupant simulation

scope, solver architecture, and role in crash safety engineering.

MADYMOmultibody-FE

Multibody and FE formulations in MADYMO

rigid bodies, joints, force elements, shell/solid elements, and coupling strategies.

Multibodyformulations

Model setup workflow

input deck structure, XML syntax, units, coordinate systems, and solver control parameters.

workflowstructure

Building a multibody occupant model

dummy database selection, joint stiffness, contact definitions, and belt routing.

Buildingmultibody

FE occupant components

airbag folding, shell meshing, material models, and fabric permeability for OOP simulations.

occupantcomponents

Hybrid coupling techniques

kinematic constraints, force-based interfaces, and time-step synchronization between MB and FE domains.

couplingtechniques

Contact and restraint modeling

belt slip, pretensioner, load limiter, and airbag deployment contact algorithms.

restraintmodeling

Material characterization for FE airbags

orthotropic fabric, viscoelasticity, and strain-rate effects under deployment.

Materialcharacterization

Occupant positioning and initial conditions

H-point, posture, seat interaction, and pre-crash kinematics.

Occupantpositioning

Load case definition

frontal, side, rear, and rollover impact pulses with barrier and sled setups.

definitionrollover

Running MADYMO simulations

solver selection, parallel execution, restart, and output file management.

MADYMOsimulations

Post-processing occupant responses

head acceleration, chest deflection, femur force, and injury criteria (HIC, THOR, Euro NCAP).

Post-processingoccupant

Validating hybrid models against physical tests

sled, drop tower, and full-scale crash data correlation.

Validatingphysical

Airbag OOP simulation

static deployment, module testing, and hybrid MB-FE modeling of inflator and bag interaction.

Side airbag and curtain airbag modeling

FE meshing, gas flow, and occupant interaction in side impacts.

modelingoccupant

Belted occupant simulation

retractor, pretensioner, load limiter, and slip ring modeling with multibody belts.

occupantsimulation

Seat and interior trim modeling

FE seat structure, foam, and contact with occupant for ride-down efficiency.

interiormodeling

Pedestrian protection

hybrid MB-FE legform, headform, and upper legform impactor simulations.

Pedestrianprotection

Child occupant safety

CRS modeling, ISOFIX, and hybrid simulation of child dummy responses.

Optimization and DOE in MADYMO

parameter studies for restraint system design using hybrid models.

OptimizationDOE

Coupling MADYMO with external FE solvers

co-simulation, MBS-FE interfaces, and real-time applications.

Advanced material models for FE airbags

porous media, gas leakage, and temperature effects.

Advancedmaterial

Robustness and sensitivity analysis

variability in occupant size, position, and material properties.

Robustnesssensitivity

Regulatory and consumer test protocols

FMVSS, ECE, Euro NCAP, and C-NCAP requirements for hybrid simulation.

Regulatoryconsumer

Troubleshooting hybrid simulations

convergence issues, contact instability, energy balance, and hourglassing.

Troubleshootingsimulations

Model reduction and real-time hybrid simulation

simplified MB models for hardware-in-the-loop and driving simulators.

reductionreal-time

frontal OOP hybrid simulation with driver airbag and unbelted occupant.

side impact hybrid simulation with curtain airbag and ES-2re dummy.

simulationES-2re

pedestrian head impact hybrid simulation with active hood and FE headform.

pedestriansimulation

integration of MADYMO hybrid models with human body models, AI-based surrogate, and digital twin for occupant safety.

integrationMADYMO