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Eva, the female crash test dummy | Astrid Linder | TEDxKTHWomen


thank you very much fantastic to be here
so honored so we have given this
opportunity let’s see do I have some
pictures here we are here you see me
together or besides me I have the first
prototype of an average female dummy
she’s a prototype as you can see for
example how her arms are made and I will
tell you more about her later but first
set her in her context and that is
traffic safety so in the world today 1.3
million people are killed every year in
traffic that’s equivalent to an airplane
with 250 persons dropping down from the
sky every hour day and night all all
year round we would never accept that
when it came to flying that we had that
situation but that is the situation on
our roads in addition to losing our life
we also lose our health for every person
killed there is 10 persons that are
severely injured and a hundred that have
slightly in-use injuries and some of
these lights in your scan lead to
permanent medical impairment so this is
the scale of what is happening in terms
of loss of life and health are no roads
and it doesn’t have to be that way in
addition we know from real-world data
that females has substantially higher
risk of getting injured and killed
compared to males a big study from the
u.s. for 11 years of data shows that the
odds for severe and fatal injury is 47%
higher the odds are 40% higher than
mates and for a broader range of
the injury for which females has the
highest risk of injury compared to males
or what is named soft tissue neck injury
more commonly called whiplash injuries
here on average the risk of female
getting an injured compared to male is
double the risk these injuries
consist of more than 60% of the cost for
the insurance for all personal cost of
all personal injuries for for all
injuries so this is the most costly
injury injury on its own and we have up
to four times the difference risk
between different cars a bit more about
the differences in risk have we known
this for a long time yes we have here
you see publications from the late 60s
and onwards until up to today the the
risk is for Mane’s it’s normally
normalized to one and then you see the
risk of the females in comparison and
these are studies from all over the
world so the lowest 1.5 and up to 3 so
what is whiplash injuries a little bit
more about this before I go into the
dummies and the details that we as
engineers work with in in the crash lab
they are off you find those in low
severe – crashes which is less than 20
kilometer per hours they occur in all
impact directions
however most commonly found in re impact
and it’s about the motion of the neck
and injuries to structures in the neck
when when in the rear impact the head
translate relative to the to the torso
like this and then goes into extension
and in addition we now have data showing
that there’s a difference
not only between different cars but also
different seats how they perform and
here I will show you data on that this
is real-world data this is from the
insurers and it’s this type of data take
around 15 years to collect so these data
was started to be collected in 1998 and
2013 they were able to had had so much
data so they could split it into males
and females and I will guide you through
this
this is seats with what is called
whiplash concepts one you have active
head restraints and the other type is we
learn whips and then Horace this
horizontal lines or the standard seat
without any protection and this is risk
of permanent medical impairment which is
disability assessed by a medical doctor
and first let’s have a look at the males
they have a lower risk in the standard
seat compared to females and then you
see that both the active head restraint
and we learn the whips will give
improved protection however when you
look at the other graph with the females
you see a different pattern you see that
those with the active henry strength
actually have the females in the doses
has less protection than if they were in
a seat without any protection system and
the wind will and the whips works for
for female s4 for males so these this as
you understand this takes a long time to
to identify and then when we identify
what to do we have the cars around the
the street we want to identify this much
earlier we want to identify this
four new cars and then we we do that by
doing tests with the models of the
occupants and this is then the models of
the occupant that we have access to
average makes these guys are frontal
high speed dummies on their way out to
the crash lab you can maybe ask yourself
or does it look like that for all impact
directions and yes here you see from
your left you have the belt test in the
middle of the frontal test and then to
your right you have the side impact test
all done with the average male as the
Tommy used these are tests done in
Europe however the same is true for the
test that is done all over the world so
this is of course an enormous limitation
when we as will assess safety so what
can be done and what have we done we are
a team of researchers in particular but
also other organizations companies and
in particular Europe there are some also
around the world which has addressed
this for the last ten years and we have
worked in two big eu-funded projects the
first one the second one we are
continuing now on and the first one we
just designed the mathematical model of
an average female in the same way as we
have the average made the average male
here is the bioroid and he is 1.77 meter
of height and comparable female then
also average would be 1.66 meter she’s
called Ava right here
and the weight of the average male is 78
kilos and the weight of the theme
average female is 62 kilos and in
addition then of course to the
difference in weight or height you have
the difference in geometry and weight
distribution and also differences in in
the joint stiffnesses which correspond
to differences in in muscle strength and
so on in the picture here you see that
both dummies seated in the same seat and
you can see the difference in height in
comparison to the head restraint and
also how the head will and the whole
torso of course will interact
differently with with the seat back I
will show you a simulation of that I
hope ya here it runs and here you see
the bio reads who your left and they
ever read to your right and you see the
differences in height relative to the
head restraint and also the difference
in how the DOM is sinking to the seat
back and the interaction with the seat
back here are the two dummies
physically you have the again the by
rate so your left and the average male
and the prototype term is that I showed
you initially to your right the 50 F
means 50s percentile which is average
and here again seated in the same seat
with the red horizontal line as the head
the height at the top of the head
restraint and you see how different the
domain is self position itself in in the
seat and of course then this can
correspond to quite different
interaction with with the seat
finally we have the prototype dummy in
in a seat in the crash test so I will
show you I hope yeah it’s running there
we are oh so yeah you will see the the
dummy how it sinks into the to the seat
and also the interaction with with the
head restraint and the differences in in
in height as I as I pointed out before
how that manifests itself in a dynamic
event so vehicles are made to be used by
both men and women we can save the
assessment should be done equally with
models of men and men and women and we
[Music] you
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