SIST EN 17950:2024
(Main)Protective helmets - Test methods - Shock absorption including measuring rotational kinematics
Protective helmets - Test methods - Shock absorption including measuring rotational kinematics
The proposed standard will specify a test method for helmets that measures the translational and rotational kinematics in impacts of a helmeted head form against an anvil.
Schutzhelme - Prüfverfahren - Stoßdämpfung einschließlich Messung der Rotationskinematik
Dieses Dokument legt ein Prüfverfahren für Helme zur Messung der Translations- und Rotationskinematik beim Aufprall eines behelmten Prüfkopfes gegen einen Sockel fest
Casques de protection - Méthodes d'essai - Absorption des chocs avec mesure de la cinématique de rotation
Le présent document spécifie une méthode d'essai pour les casques, qui mesure les cinématiques de translation et de rotation lors d'impacts d'une fausse tête munie d'un casque contre une enclume.
Varovalne čelade - Preskusne metode - Absorpcija udarcev, vključno z merjenjem rotacijske kinematike
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2024
Varovalne čelade - Preskusne metode - Absorpcija udarcev, vključno z merjenjem
rotacijske kinematike
Protective helmets - Test methods - Shock absorption including measuring rotational
kinematics
Schutzhelme - Prüfverfahren - Stoßdämpfung einschließlich Messung der
Rotationskinematik
Casques de protection - Méthodes d'essai - Absorption des chocs avec mesure de la
cinématique de rotation
Ta slovenski standard je istoveten z: EN 17950:2024
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17950
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 13.340.20
English Version
Protective helmets - Test methods - Shock absorption
including measuring rotational kinematics
Casques de protection - Méthodes d'essai - Absorption Schutzhelme - Prüfverfahren - Stoßdämpfung
des chocs avec mesure de la cinématique de rotation einschließlich Messung der Rotationskinematik
This European Standard was approved by CEN on 10 June 2024.
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17950:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Prerequisites . 7
4.1 Parameters needed . 7
4.2 Headform . 7
5 Test method . 10
5.1 General. 10
5.2 Principle . 10
5.3 Apparatus . 10
5.4 Procedure . 12
6 Test report . 12
Annex A (normative) Headform coefficient of friction verification test . 13
A.1 General. 13
A.2 Conditioning . 13
A.3 Prerequisites . 13
A.4 Procedure . 14
Annex B (normative) Test results – Uncertainty of measurement . 16
Bibliography . 17
European foreword
This document (EN 17950:2024) has been prepared by Technical Committee CEN/TC 158 “Head
protection”, the secretariat of which is held by SIS.
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 January 2025, and conflicting national standards shall
be withdrawn at the latest by January 2025.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the United
Kingdom.
Introduction
0.1 Purpose and background
The test method described in this document is designed to measure translational and rotational
kinematics from any helmeted dynamic event such as an impact to an object. Statistics from bike, ski,
equestrian, and other accidents show that oblique impacts, resulting in a combination of translational
and rotational kinematics of the head, are more frequent than pure translational impacts. EN 13087-2,
Protective helmets — Test methods — Part 2: Shock absorption measures only the translational motion in
impacts against flat, hemispherical or curb stone anvils. A test method that measures the translational
and rotational kinematics is therefore important and much needed.
As this document specifies the measuring the translational and rotational kinematics, it is possible to use
this document as a complementary test method to EN 13087-2 when performing tests to measure shock
absorption of helmets.
This document does not replace EN 13087-2.
0.2 Background to the design of the test method
Preliminary discussions to start work on the test method specified in this document started in 2006. In
2013, the responsible working group within CEN/TC 158 Head protection, Headforms and test methods,
accelerated the work on the design of the test method.
Extensive efforts to ensure the soundest state-of-art test method have been made by:
— gathering data and scientific evidence from the widest range of scientific sources possible;
— performing multiple round robin tests;
— organizing numerous physical and online working group meetings in which a multitude of
alternatives were analysed and discussed exhaustively before finally opting for the final design
specified in this document;
— ensuring that experts within the field of biomechanics and brain understanding are members of the
working group.
As part of the CEN standardization process, the content of this document has been further scrutinized
and refined by other stakeholders and experts in the member countries of CEN.
0.3 Headform
A new headform without a neck for rotational impact tests has been developed for the test method
specified in this document. The main reasons for developing a new type of headform are described below:
a) analysis of the inertial properties (mass, moment of inertia and centre of gravity) of the existing
EN 960 and Hybrid III headforms showed values that were very different from the values found in
literature from measurements of the human head. This is not surprising as the EN 960 headform
includes parts of a rigid neck, and the Hybrid III headform was developed for frontal car collisions
and not for helmet testing;
b) the new test method requires that the outer surface of the headform that comes in contact with the
helmet has more humanlike properties. Specifically, the coefficient of friction between the headform
and the inner surface in a helmet needs to be specified. Neither the EN 960 headform nor the
Hybrid III headform has the coefficient of friction specified for the headform specification in this
document.
0.4 Performance requirements and prerequisites
Performance requirements for pass/fail criteria when using the test method in this document will be
specified in the relevant helmet product standards. The writers of those documents will also specify test
prerequisites, see Clause 4 for details.
1 Scope
This document specifies a test method for helmets that measures the translational and rotational
kinematics in impacts of a helmeted headform against an anvil.
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 12195-2, Load restraint assemblies on road vehicles — Safety — Part 2: Web lashing made from man-
made fibres
ISO 6487, Road vehicles — Measurement techniques in impact tests — Instrumentation
ISO 6344-2, Coated abrasives — Determination and designation of grain size distribution — Part 2:
Macrogrit sizes P12 to P220
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 https://www.electropedia.org
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
Tragion point
cephalometric point in the notch just above the tragus of the ear
Note 1 to entry: The Tragion point is part of defining the Frankfort plane and close to the external auditory meatus.
Note 2 to entry: The Tragion point is illustrated in Figure 1 in 4.2.6 and is defined in the CAD files described in 4.2.2.
3.2
Frankfort plane
longitudinal plane defined on the headform through the Tragion point (3.1) and the lower orbit of the eye
Note 1 to entry: The Frankfort plane is similar to the basic plane defined in EN 960.
Note 2 to entry: The Frankfort plane is illustrated in Figure 1 in 4.2.6.
3.3
10° plane
plane on the headform angled 10° from the reference plane (3.4) at the rear of the head at the intersection
of the reference plane and the midsagittal plane
Note 1 to entry: The 10° plane is illustrated in Figure 1 in 4.2.6.
3.4
reference plane
horizontal plane distance ‘a’ above the Frankfort plane (3.2)
Note 1 to entry: The reference plane and distance ‘a’ are illustrated in Figure 1 in 4.2.6.
Note 2 to entry: Distance ‘a’ is distance ‘x’ in EN 960.
4 Prerequisites
4.1 Parameters needed
To perform the test method specified in this document, the following parameters shall be specified:
a) performance requirements;
b) preparation of samples;
c) sequence of conditioning;
d) sequence of tests;
e) sizes of headforms;
f) number and locations of impact points on the helmet;
g) for each impact, the impact energy, including tolerance or the impact speed, including tolerance;
h) requirements of the retention system.
NOTE Requirements for the parameters needed can be found in the relevant helmet product standard.
4.2 Headform
4.2.1 General
The headform shall not exhibit any resonant frequencies < 2 000 Hz.
4.2.2 External geometry
The external geometry of the headform shall conform to the specifications in the CAD files which are
provided in the attached file CAD.zip.
NOTE There is one CAD file for each size of the headform.
The surface tolerance shall be ± 1 mm above the reference plane and ± 2 mm below the reference plane.
4.2.3 Headform specifications
The headform including the instrumentation shall conform to the specifications in Table 1.
The hardness of the headform surface shall be m
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