Transcript Headform test with deceleration measurements: Guide

IGPG-05-03
Headform Test with deceleration
measurements : guide system
UN ECE – GRSG – IGPG – 5th Session
R43 – An. 3 §3.2
 §3.2.2. To perform the headform test
the phantom head is fixed to the cross
arm of the guide system and moved
to the required drop height by means
of a lifting device. During the
headform test, the cross arm with the
phantom head is released. After
passing the height adjustable light
barrier the phantom head is released
from the cross arm, the cross arm’s
fall is dampened and the phantom
head falls onto the sample.
 No impulse may be given to the
phantom head by the drop appliance
or by the measuring cable, so that it is
accelerated only by gravity and falls
vertically.
Question raised: Can the phantom head be
used without the guiding system?
 The regulation in its present state does not offer
an alternative to the guiding system
 § 3.2.2.2: (…) A guide system is not necessary
for these [calibration] small drop heights. The heights for
the calibration are comprised between 50 & 254mm
 DIN 52310-2: 2011-04 revision to allow the
possibility of performing the test without the
guiding system.
Guiding system: concerns
 Calibration problems
 No precision on the type of cables needed
(roughness, etc.)
 Questioning the utility of the guide, instead of a
free drop at the right height
 Repeatability better than on a free drop only?
Opinions from Dr Matthias Dümmler
The calibration values of ECE-R43 cannot be reached with headforms
set up according to the instruction given in the regulation. Further, we
have added the alternative to operate with wireless data transmission
because this is state of the art and has many advantages. In this case,
the leading wires would not be required. There are also several more
minor modifications.
Presently, the ISO/TC22/SC11 works on the revision of ISO 15082. I
have brought in a new section which describes the headform test with
deceleration measurement according to our revised German standard.
Therefore, when this revision of iSO 15082 has been published, there
will be a base to adapt ECE-R43 accordingly.
Until ECE-R43 has been modified concerning this test, in our opinion
the modified test procedure can already be used, since with the current
description you have no chance to do a successful calibration anyway.
Opinion from Christian Pichon (UTAC)
« I don’t have information on the new version of the DIN standard that
is not integrated in the R43 and there is no proposition in that direction.
We use the equipment conform to the regulation and we have had a lot
of trouble to calibrate it when we got it years ago.
The use of the equipment without the guide is not conform to the text
and you will need to demonstrate that the solution [without the guide]
respects the characteristics required, not only in terms of deceleration
but also in terms of the precision of the point of impact and the
positioning of the head (angularity with respects to the vertical).
The main problem we met during the calibration was linked to the
manufacturing of the phantom head that needed tweeking at every change of
height. I am not responsible for these tests anymore and I didn’t receive more
recent information on the topic. (…)
As ISO 17025 auditor, I will ask you to prove me that the equipment without the
guide has no influence with regards to the regulatory text. »
(translated from the original text in French)
UTAC: Union Technique de l’Automobile, du motocycle et du cycle
Opinion from the VCA
 Tony Stenning:
(…) I do have responsibility in VCA for interpretation of legislation. We
have a process to deal with such queries and I will pass on your
question to our Technical Support Group, who will respond to you in
due course.
 Kevin Bridges:
To certify to R43, all the equipment specified in Annex 3, 3.2.2 must be
used when carrying out the testing.
As DIN52310-22 is a voluntary standard and is not specified in R43, the
test methods in it cannot be used for carrying out R43 type approval
testing.
Opinion from IGPG members?