applications of the ghbmc models using the piper · pdf filemetadata (.pmr, fe): user defined;...

Project funded by the European Union Seventh Framework Programme ([FP7/2007-2013]) under grant agreement n°605544 (Collaborative project PIPER)

Applications of the GHBMC models

using the PIPER tools

Philippe Beillas1,2, Anicet Le Ruyet1, Erwan Jolivet3, Pascal Baudrit3,

Eric Song4, Philippe Petit4

GHBMC Users’ Workshop, June 4, 2017

1 Univ. Lyon 1 – Ifsttar, France 3 CEESAR, France

2 On behalf of the PIPER consortium 4 LAB-PSA Peugeot -Renault, France

Introduction: motivation

FE Human body Models (HBM)

one posture (simul); population coverage ~= dummy ( scaling)

Scaling & Positioning (S&P) practice diverse (custom scripts…)

Wide use will require specs?, repro?, Openness?

Issues both technical and organizational…







PIPER EU Project - Nov 2013-Apr. 2017

10 partners, FP7, 3.8M€, 2.9M€ funded









Objectives (technical and organizational)

(1) Software framework to help S&P any HBM

(2) Baseline child model

Open Source, …









Objectives (technical and organizational)

(1) Software framework to help S&P any HBM

(2) Baseline child model

Today: framework overview

+ examples (GHBMC M50-PS, M50-O)

Open Source, …

PIPER Framework: basic concept

Idea: knowledge relevant for S&P (e.g. physiology, coordination,

anthro…) often not in HBM (=focus @20g) knowledge and num.

methods could be shared between HBMs





Input of different HBM / solvers? Without recompiling? IP?

Solver (not HBM) specific: Geometry (nodes, elts…)

xml based rules: user modifiable (.pfr file); provided

Metadata (.pmr, FE): user defined; once








Concepts required for S&P (e.g. bone, landmarks, joints, contacts)

Concepts naming: AnatomyDB

1) groups (parts, elts, nodes) describing

concepts FE format

2) Define Concept (parameters, associate

groups .pmr (xml)

Metadata (.pmr, FE): user defined; once








Concepts required for S&P (e.g. bone, landmarks, joints, contacts)

Concepts naming: AnatomyDB

1) groups (parts, elts, nodes) describing

concepts FE format

2) Define Concept (parameters, associate

groups .pmr (xml)

Existing metadata

• GHBMC M50-O

• v4.1: (most

detailed), v4.4

• GHBMC M50-PS

• PIPER Child, Thums

v3, v4 (AM50), ViVA

Modular framework

FE HBM FE HBM

PIPER Framework

Updated

User target

Modular framework

GUI

(+batch)

PIPER model FE HBM

Metadata .pmr

FE HBM

Solver .pfr PIPER Framework

PIPER

target

Updated

User target

Modular framework

Various modules available; others can be added (use infrastructure)

Give possibilities but respect modelling intentions and practices

GUI

(+batch)

Update

Modules

(num. methods

Knowledge, data…)

PIPER model FE HBM

Metadata .pmr

FE HBM


PIPER

target

Updated

User target

Modular framework

Various modules available; others can be added (use infrastructure)

Give possibilities but respect modelling intentions and practices

Build on top of Open Source libraries (VTK, Sofa, Eigen…),

Windows, Linux

Mostly in C++, Qt Gui+ scripting: Python (access internal variables), Octave

(loose integration…)

GUI

(+batch)

Update

Modules

(num. methods

Knowledge, data…)

PIPER model FE HBM

Metadata .pmr

FE HBM


PIPER

target

Updated

User target

Application 1 – pedestrian

Scaling objective: scale M50-

PS based on a few PMHS

measurements




measurements

(1) Few measurements

complement using

anthropometric database

(ANSUR)

Anthro. prediction module:

predict likely anthro. based

on few metrics (computed

dynamically on database,

using Parkinson Reed 2011

approach)

3 Open databases provided with PIPER

• ANSUR (young, military)

• Snyder (Children)

• CCTAnthro (released by CEESAR)




measurements

(1) Few measurements

complement using

anthropometric database

(ANSUR)

Anthro. prediction module:

predict likely anthro. based

on few metrics (computed

dynamically on database,

using Parkinson Reed 2011

approach) Larger set of dimensions=

target definition

3 Open databases provided with PIPER

• ANSUR (young, military)

• Snyder (Children)

• CCTAnthro (released by CEESAR)

PMHS


(2) correspondence

anthro <-> M50-OS

Scaling contraint

(source: Gordon 1989)

Landmarks+

Hierarchy +

Intersect on skin

Interactive, adjustable, …

Note: shoes=28mm


(2) correspondence

anthro <-> M50-OS

Scaling contraint

(3) Apply target

anthro, Adjust, and

to update scalable

model and control

points


Landmarks+

Hierarchy +

Intersect on skin


Note: shoes=28mm


(2) correspondence

anthro <-> M50-OS

Scaling contraint

(3) Apply target

anthro, Adjust, and

to update scalable

model and control

points

(4) Scale HBM by

Kriging interpolation

(control points)


Landmarks+

Hierarchy +

Intersect on skin


1715 mm 1786 mm

74.5 kg 65.2 kg

Note: shoes=28mm

Appl. 1: pedestrian – Prelim. results

Models are runnable (no error)

Similar numerical performance (energy, hourglass, stability…)

Appl. 1: pedestrian – Prelim. results

Models are runnable (no error)

Similar numerical performance (energy, hourglass, stability…)

Effect on forces limited

Effect on kinematics more

important (pelvis, point and time

of head impact). No velocity

change

Could help study response over

a range of stature rather than

average.

0 50 75 140 150

Application 2: occupant

Luet et al (2012) sleds: M50-O submarining in case where the PMHS did not

Even after positioning (by simulation)

Luet et al (2012) Stapp

Subject #635: no

M50

yes by

70ms

Application 2: occupant

Luet et al (2012) sleds: M50-O submarining in case where the PMHS did not

Even after positioning (by simulation)

Leg thinning…

Luet et al (2012) Stapp

Subject #635: no

“Thin”

no

@70ms

M50

yes by

70ms

• Objectives: illustrate use of PIPER to (1) scale (2)

change position closer to a test subject

Scaling

Trial 1: global scaling (anthro+est.) similar pedestr

Scaling


Shrink with skin

Scaling


Shrink with skin

Kriging tool: can scale independently

skeleton and skin, fix skeleton, use

surface distance, domains, relaxation,

for arbitrary number of control points…

Constraints Basic Fixed bones

Surf. dist

Scaling


Trial 2: global scaling @

constant BMI (+Height,

seating H), Fix bone, ajust

sections

Shrink with skin

Scaling

Trial 1: global scaling

(anthro+est.) similar

pedestr

Trial 2: global scaling @

constant BMI (+Height,

seating H), Fix bone, ajust

sections

Trial 3 (ongoing): use

internal landmark data…

Shrink with skin

Positioning

Lightweight physics sim. (Sofa)

• Model built on metadata

(Bones, joint, collisions,

contact, +soft tissues)

(near) real time interactions

• Constraints: angles, positions

(landmarks), …

Positioning

Discussion and conclusions

New open framework, HBM

agnostic, some state of the art

numerical methods…

Publication process ongoing…






Limitations include:

Limited internal data for scaling…

Ongoing process

With internal

landmark data






Limitations include:

Limited internal data for scaling…

Limited testing: lots of development,

many possibilities, a few applications,

different results posible

Performance? Workarounds?

Issues? Future needs? …

Ongoing process

With internal

landmark data

Perspectives: Open Source

Software: under General Public License (GPLv2) or later Free, same license for modifications (www.gnu.org)

Note: GHBMC metadata: conditions discussed right

now…


Software: under General Public License (GPLv2) or later Free, same license for modifications (www.gnu.org)

Note: GHBMC metadata: conditions discussed right now…

PIPER scalable child (1.5-6+ yo), GPLv3 +Open Science

6YO base, ~550k elt, 20+ validation setups (most PMHS), Dyna

Perspective (PDB outside PIPER): pedestrian, Pam, Abaqus

Arbogast et al. (2009) , Irwin et al. (2003, Scaled) Kallieris et al.

(1976), Loyd (2011), Ouyang et al. (2003a, 2003b, 2005, 2006)


Open Source project:

Aim: promote HBM use for transportation safety; Open Source, Open Science, open to diversity of practices…

All contributions are welcomed…

www.piper-project.org

http://www.piper-project.org/



Perspectives: Open Source Open Source project:

Aim: promote HBM use for transportation safety; Open Source, Open Science, open to diversity of practices…

All contributions are welcomed…

Release: software, child, …

v0.9.9: (pre-) distributed at workshop

v1.0.0: Web Release (matter of days)

v1.0.1: end June (landmarks…)

Gitlab Wiki (tutorials, guidelines…)+videos

Goodies

www.piper-project.org

3rd party




This research has received funding from the European FP7 Programme (FP7/2007-2013) under

grant agreement n°605544

For more info:

http://www.piper-project.org

http://www.piper-project.eu

P Beillas, X Wang, Y Lafon, B Fréchède, T Janak, T Dupeux, M Mear, A Le Ruyet, MC

Chevalier, J Collot, M Gardemont, A Eichene, I Theodorakos, X Yin, G Pacquaut, P Portejoie;

T Lemaire, F Faure, B Gilles, U. Vimont; S Kleiven, C Giordano, V Alvarez, X Li; C Lecomte,

A Bhaskar, M Bah, P Mailliez; S Kirscht, W Goede, A Saeed, J. Holtz; E Jolivet, P Baudrit; N

Praxl, J Peres; A Chawla, A Chhabra, S Paruchuri, S Singh; P Petit, E Song; P Odet

PIPER Project contributors

Thank you!

Feedback?

Questions?

applications of the ghbmc models using the piper · pdf filemetadata (.pmr, fe): user defined;...

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