Road restraint systems - Validation and verification process for the use of virtual testing in crash testing against vehicle restraint system

This document defines the accuracy, credibility and confidence in the results of virtual crash test to roadside safety devices through the definition of procedures for verification, validation and development of numerical models for roadside safety application. Finally it defines a list of indications to ensure the competences of an expert/organization in the domain of virtual testing.

Rückhaltesysteme an Straßen - Validierungs- und Nachweisverfahren für die Nutzung von Computersimulationen bei Anprallprüfungen an Fahrzeug-Rückhaltesysteme

Dieses Dokument legt die Genauigkeit, Glaubwürdigkeit und Vertrauenswürdigkeit der Ergebnisse der Computersimulation von Anprallprüfungen an Fahrzeug-Rückhaltesysteme Straßen fest, indem Verfahren für die Verifizierung, Validierung und Entwicklung von numerischen Modellen zur Sicherung an Straßen festgelegt werden. Letztlich legt es eine Liste von Anhaltspunkten fest, wie die Kompetenzen eines Experten/einer Organisation im Bereich der Computersimulationsprüfungen sichergestellt werden.

Dispositifs de retenue routiers - Processus de vérification et de validation pour l’utilisation d’essais virtuels dans les essais de choc contre un dispositif de retenue pour véhicules

Le présent document établit les exigences d’exactitude, de crédibilité et de confiance dans les résultats d’essais de choc virtuels contre des dispositifs de retenue pour véhicules en définissant les procédures de vérification, de validation et de développement de modèles numériques pour les applications de sécurité routière. Il fournit en outre une liste d’indications pour garantir les compétences d’un expert/organisme du domaine des essais virtuels.

Oprema cest - Postopek validacije in verifikacije računalniške simulacije preskusnih trčenj v sisteme za zadrževanje vozil

General Information

Status
Published
Public Enquiry End Date
24-Jun-2018
Publication Date
07-Sep-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
25-Aug-2020
Due Date
30-Oct-2020
Completion Date
08-Sep-2020

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SLOVENSKI STANDARD
SIST EN 16303:2020
01-oktober-2020
Nadomešča:
SIST-TP CEN/TR 16303-1:2012
SIST-TP CEN/TR 16303-2:2012
SIST-TP CEN/TR 16303-3:2012
SIST-TP CEN/TR 16303-4:2012
Oprema cest - Postopek validacije in verifikacije računalniške simulacije
preskusnih trčenj v sisteme za zadrževanje vozil

Road restraint systems - Validation and verification process for the use of virtual testing

in crash testing against vehicle restraint system

Rückhaltesysteme an Straßen - Validierungs- und Nachweisverfahren für die Nutzung

von Computersimulationen bei Anprallprüfungen an Fahrzeug-Rückhaltesysteme

Dispositifs de retenue routiers - Processus de vérification et de validation pour l’utilisation

d’essais virtuels dans les essais de choc contre un dispositif de retenue pour véhicules

Ta slovenski standard je istoveten z: EN 16303:2020
ICS:
13.200 Preprečevanje nesreč in Accident and disaster control
katastrof
93.080.30 Cestna oprema in pomožne Road equipment and
naprave installations
SIST EN 16303:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 16303:2020
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SIST EN 16303:2020
EN 16303
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2020
EUROPÄISCHE NORM
ICS 13.200; 93.080.30 Supersedes CEN/TR 16303-1:2012, CEN/TR 16303-
2:2012, CEN/TR 16303-3:2012, CEN/TR 16303-
4:2012
English Version
Road restraint systems - Validation and verification
process for the use of virtual testing in crash testing
against vehicle restraint system

Dispositifs de retenue routiers - Processus de Rückhaltesysteme an Straßen - Validierungs- und

vérification et de validation pour l'utilisation d'essais Nachweisverfahren für die Nutzung von

virtuels dans les essais de choc contre un dispositif de Computersimulationen bei Anprallprüfungen an

retenue pour véhicules Fahrzeug-Rückhaltesysteme
This European Standard was approved by CEN on 24 May 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16303:2020 E

worldwide for CEN national Members.
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SIST EN 16303:2020
EN 16303:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 5

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 7

4 Symbols and abbreviations ......................................................................................................................... 8

5 Requirements for numerical vehicle model .......................................................................................... 9

5.1 Modelling ............................................................................................................................................................ 9

5.2 General vehicle model behaviour assessment .................................................................................. 10

5.3 Test methodology ......................................................................................................................................... 10

5.4 Verification ..................................................................................................................................................... 13

5.5 Reporting ........................................................................................................................................................ 13

6 Requirements for numerical model of vehicle restraint system ................................................ 13

6.1 Modelling ......................................................................................................................................................... 13

6.2 Validation and verification ....................................................................................................................... 14

6.3 Reporting ........................................................................................................................................................ 14

7 Requirements for numerical model of passive safety device ...................................................... 14

7.1 Modelling ......................................................................................................................................................... 14

7.2 Validation and verification ....................................................................................................................... 14

7.3 Reporting ........................................................................................................................................................ 14

8 Requirements for validation of virtual testing against test item ................................................ 14

8.1 General ............................................................................................................................................................. 14

8.2 Test specifications ....................................................................................................................................... 15

8.3 Comparison tables ....................................................................................................................................... 17

8.4 Reporting ........................................................................................................................................................ 22

9 Requirements for verification of virtual testing against vehicle restraint systems and

passive safety devices ................................................................................................................................. 23

9.1 General ............................................................................................................................................................. 23

9.2 Finite element model verification .......................................................................................................... 23

9.3 Multi-body model verification ................................................................................................................. 23

9.4 Standard report and output parameters ............................................................................................. 24

Annex A (normative) Virtual testing – Template for report ...................................................................... 25

A.1 General ............................................................................................................................................................. 25

A.2 Verification and validation report ......................................................................................................... 25

A.3 New performance report ........................................................................................................................... 34

Annex B (normative) Requirements for the entity (person/group) performing and

verifying VT activities ................................................................................................................................. 42

Annex C (normative) Validation procedures of a vehicle for crash test analysis .............................. 44

C.1 General ............................................................................................................................................................. 44

C.2 Vehicle setup – Idle test (Test 1.1) ......................................................................................................... 44

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SIST EN 16303:2020
EN 16303:2020 (E)

C.3 Vehicle suspension and steering kinematics ...................................................................................... 44

C.4 Vehicle handling ............................................................................................................................................ 46

C.5 Vehicle crashworthiness - Test against rigidwall / rigid pole (Test 4.1 and 4.2) .................. 46

Annex D (informative) Considerations on the modelling techniques of a vehicle ............................. 47

D.1 General ............................................................................................................................................................. 47

D.2 General scheme of a vehicle ...................................................................................................................... 47

D.3 Vehicle validation considerations .......................................................................................................... 48

D.4 Step by step development of a vehicle for crash test analysis ...................................................... 49

Annex E (informative) Recommendations and criteria for finite element vehicle models

addressed to virtual testing ...................................................................................................................... 50

E.1 Components to be modelled ..................................................................................................................... 50

E.2 Model organization ...................................................................................................................................... 53

E.3 General recommendations for the material of finite element vehicle models

addressed to virtual testing ...................................................................................................................... 56

E.4 General recommendations for the mesh of finite element vehicle models addressed

to virtual testing ............................................................................................................................................ 57

Annex F (informative) Recommendations and criteria for multi-body vehicle models

addressed to virtual testing ...................................................................................................................... 61

F.1 Multi-body models ....................................................................................................................................... 61

F.2 General requirements ................................................................................................................................. 61

F.3 Modelling requirements ............................................................................................................................ 61

F.4 Model organization ...................................................................................................................................... 62

F.5 General recommendations for the material of multi-body-element vehicle models

addressed to virtual crash test ................................................................................................................ 74

Annex G (informative) Considerations on the modelling techniques of a vehicle restraint

system ............................................................................................................................................................... 75

G.1 General ............................................................................................................................................................. 75

G.2 Finite element and multi-body approaches ........................................................................................ 75

G.3 Finite element guidelines .......................................................................................................................... 76

G.4 Multi-body guidelines ................................................................................................................................. 76

G.5 Step by step development of a vehicle restraint system ................................................................ 76

G.6 Verification of the model ........................................................................................................................... 78

Annex H (informative) Recommendations and criteria for finite element vehicle restraint

system models addressed to virtual testing ....................................................................................... 80

H.1 Material recommendations for finite element vehicle restraint system models

addressed to virtual testing ...................................................................................................................... 80

H.2 General recommendations for the mesh of finite element vehicle restraint system

models addressed to virtual testing ...................................................................................................... 80

H.3 2D-mesh specifications ............................................................................................................................... 80

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EN 16303:2020 (E)

H.4 Welding and connections .......................................................................................................................... 81

H.5 3D-mesh specifications – Mesh features .............................................................................................. 81

Annex I (informative) Recommendations and criteria for multi-body vehicle restraint

system models addressed to virtual crash testing ........................................................................... 82

I.1 Introduction ................................................................................................................................................... 82

I.2 Welding and connections .......................................................................................................................... 82

I.3 Model validation ........................................................................................................................................... 82

Annex J (informative) Failure modes ................................................................................................................. 83

Bibliography ................................................................................................................................................................. 85

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SIST EN 16303:2020
EN 16303:2020 (E)
European foreword

This document (EN 16303:2020) has been prepared by Technical Committee CEN/TC 226 “Road

equipment”, the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by February 2021, and conflicting national standards shall

be withdrawn at the latest by February 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes CEN/TR 16303-1:2012, CEN/TR 16303-2:2012, CEN/TR 16303-3:2012 and

CEN/TR 16303-4:2012 (which have been merged).

In comparison to the previous Technical Reports, this document contains the following changes:

— some symbols and abbreviations have been modified;

— the roadmap for the validation of the numerical vehicle model has been updated and acceptance

conditions have been provided;

— the validation requirements for virtual testing against vehicle restraint systems have been updated;

— the verification evaluation criteria for finite element model have been updated;

— the template of the report has been updated.
Annexes A, B and C are normative and Annexes D to J are informative.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United

Kingdom.
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SIST EN 16303:2020
EN 16303:2020 (E)
Introduction

This document provides a common basis for the use of virtual testing to reproduce vehicle impacts

against vehicle restraint systems including safety barriers, crash cushions, terminals and passive safety

devices in accordance with the EN 1317 (all parts) and the EN 12767:2019.

This document provides requirements to establish the degree to which the numerical models of vehicle

restraint system and of vehicle are an accurate representation of the real world from the perspective of

the intended uses of the model.

In this document a methodology is defined to validate the results obtained with computational mechanics

work and to verify the reliability of the virtual test. It also includes a report template and incorporates

specific content for general requirements for the competence of entities performing virtual testing.

General recommendations based on experiences for developing numerical models of vehicle restraint

systems and vehicles for virtual tests are also given.
Two main modelling approaches have been considered:
— finite element (FE) method;
— multi-body (MB) approach.
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SIST EN 16303:2020
EN 16303:2020 (E)
1 Scope

This document defines the accuracy, credibility and confidence in the results of virtual crash test to

vehicle restraint systems through the definition of procedures for verification, validation and

development of numerical models for roadside safety application. Finally it defines a list of indications to

ensure the competences of an expert/organization in the domain of virtual testing.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1317-1:2010, Road restraint systems - Part 1: Terminology and general criteria for test methods

EN 1317-2:2010, Road restraint systems - Part 2: Performance classes, impact test acceptance criteria and

test methods for safety barriers including vehicle parapets

EN 1317-3:2010, Road restraint systems - Part 3: Performance classes, impact test acceptance criteria and

test methods for crash cushions

ENV 1317-4:2001, Road restraint systems – Part 4: Performance classes, impact test acceptance criteria

and test methods for terminals and transitions of safety barriers

EN 12767:2019, Passive safety of support structures for road equipment - Requirements and test methods

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp/ui
3.1
independent expert

third-party qualified expert in virtual testing with experience on vehicle restraint systems and/or passive

safety devices, independent from the organisation or the construction product he assesses (see Annex B)

3.2
numerical model

complete mathematical 3-D model of vehicle restraint systems, passive safety devices and vehicles

Note 1 to entry: It refers to a numerical model which might be analytical or discrete and aims to reproduce the

basic physical phenomena of a subject.
3.3
passive safety device
support structures for road equipment tested according to EN 12767:2019
The scope of this document is also applicable to passive safety devices.
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SIST EN 16303:2020
EN 16303:2020 (E)
3.4
real test
real test performed at a test house according to the relevant standard
3.5
test item
device to be assessed using virtual testing
3.6
validated model

numerical model of the roadside or passive safety device or vehicle that fulfils the requirements of this

document after being checked and agreed by an independent expert
3.7
validation

set of activities defined to assess whether a numerical model can be considered representative of a

physical system or part in a specified range of conditions
3.8
vehicle restraint system
device tested according to EN 1317-1 and EN 1317-2, EN 1317-3or ENV 1317-4
3.9
verification

set of activities defined to check whether a numerical model is reliable and numerically stable

3.10
virtual test or virtual testing

activities related to the use of a numerical model to reproduce a real test and/or to simulate an impact

4 Symbols and abbreviations

For the purposes of this document, the following symbols and abbreviations apply:

ASI acceleration severity index
CoG centre of gravity
D dynamic deflection
D measured maximum dynamic deflection of the real test, in metres (m)

D measured maximum dynamic deflection of the real test with a tolerance of ± 0,15 m, in

m_mod
metres (m)
D measured maximum dynamic deflection of the virtual test, in metres (m)
FE finite elements
FEA finite elements analysis
HGV heavy goods vehicle
LD lateral displacement
LDm measured lateral displacement of the real test, in metres (m)

LD measured lateral displacement of the real test with a tolerance of ± 0,15 m, in metres (m)

m_mod
LD measured lateral displacement of the virtual test, in metres (m)
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SIST EN 16303:2020
EN 16303:2020 (E)
MB multi-body
MBA multi-body analysis
THIV theoretical head impact velocity
TT type test
VI vehicle intrusion
VI measured vehicle intrusion of the real test, in metres (m)

VI measured vehicle intrusion of the real test with a tolerance of ± 0,15 m, in metres (m)

m_mod
VI measured vehicle intrusion of the virtual test, in metres (m)
VT virtual test or virtual testing
W working width
W measured working width of the real test, in metres (m)

W measured working width of the real test with a tolerance of ± 0,15 m, in metres (m)

m_mod
W measured working width of the virtual test, in metres (m)
ΔF change in force
Δs change in displacement
5 Requirements for numerical vehicle model
5.1 Modelling

A complete 3D numerical model of a real test vehicle according to EN 1317-1:2010 respectively

EN 12767:2019, as relevant, shall be created. The geometry of the vehicle and all inertial properties shall

be reproduced accurately. The numerical model shall include at least:
— frame;
— body;
— suspensions systems, front and rear;
— wheels;
— steering system;
— windows;
— engine block;
— ballast.

Vehicle specifications under test conditions shall be as specified as in EN 1317-1:2010, Table 1 and the

EN 12767:2019, 5.3, as relevant.

The vehicle shall be fitted with, as a minimum, one accelerometer for measurement in the longitudinal

(forward) direction, one for the lateral (sideways) direction, one for the vertical direction (downward)

and an angular velocity sensor (rate sensor). The accelerometers shall be mounted as prescribed by the

EN 1317-1:2010. Vehicular accelerations shown by this accelerometer shall be used for the calculation of

the severity indices, according to EN 1317-1:2010.
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SIST EN 16303:2020
EN 16303:2020 (E)

The model shall be able to reproduce the comparable deformation observed in the type test.

5.2 General vehicle model behaviour assessment

For the validation of the numerical vehicle model, tests shall be performed according to this document,

comparable parameters shall be measured and the results shall be fully documented.

The validation tests that shall be carried out to ensure the numerical stability and the capability of the

numerical model are divided in categories dealing with vehicle setup, vehicle suspension and steering

kinematics, handling and crashworthiness.
5.3 Test methodology
5.3.1 General

The scope of the following analysis is to ensure the stability and robustness of the vehicle model and the

level of reliability of the results.

The finite element model and the multi body vehicle model shall be validated with the same requirements

and limits.

This procedure consists of a fixed number of compulsory tests and a series of additional tests that can be

performed depending on the intended use of the model.

For the vehicle model in order to be considered validated all compulsory tests shall be completed without

error terminations for the specified time.

In general the analysis shall be performed when the vehicle development is completed. Modification(s)

will require to perform some or the full set of the tests again.

In special situations where requirements of this document cannot be satisfied, deviations from the given

rules shall be reported and motivations shall be explained and then checked and agreed by an

independent expert (see Annex B). These exceptions shall only be motivated by technical and not by

economical reasons. An exception can be e.g. if the measurement in a real test cannot be reproduced

consistently.
5.3.2 Test description
5.3.2.1 Compulsory test
The tests are grouped in four different sets:
— Set 1. – Vehicle setup;
— Set 2. – Vehicle suspension and steering kinematics;
— Set 3. – Vehicle handling;
— Set 4. – Vehicle crashworthiness.

The tests included in Table 1 shall be performed to complete the vehicle validation.

The table includes the scope of the test, the results to be provided and the acceptance conditions (limits).

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SIST EN 16303:2020
EN 16303:2020 (E)
Table 1 — Vehicle validation roadmap compulsory tests
Set 1. – Vehicle setup
Test 1.1 - Idle test (described in C.2)
Scope: Results to be provided: Limits:

Verify stability of the — Acceleration time (filtered: filter class CFC60) — Filtered accelerations:

vehicle model and 2
— Suspensions movement time history a < ± 3,0*9,81[m/s ]
general setup when
— Suspension movement:
stationary
Δs < |20| [mm] for all
vehicles except heavy
goods vehicles with
mass of 38 tons
Δs < |80| [mm] for heavy
goods vehicles with
mass of 38 tons
Set 2. – Vehicle suspension and steering kinematics

Test 2.1 – Isolated suspensions system (constrained vehicle) – full compression (described in C.3.1)

Scope: Results to be provided: Limits:

Verify suspension — Comparison between input curves and response — Allowed variation

kinematic and loading between input curves
— Identify the suspension maximum compression
and unloading and response:
capacity 0 0
ΔF < │0,05│*F Where F is
the suspension force
when stationary,
displacement
s = 0[mm] (see
Figure F.7 and F.8)

Test 2.2 – Isolated suspensions system (constrained vehicle) – full extension (described in C.3.1)

Scope: Results to be provided: Limits:

Verify suspension — Comparison between input curves and response — Allowed variation

kinematic and loading between input curves
— Identify the suspension maximum extension
capacity and response:
ΔF < │0,05│*F
Where F is the
suspension force when
stationary,
displacement
s = 0[mm] (see
Figure F.7 and F.8)
Test 2.3 – Isolated steering system (constraine
...

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