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www.tiretechnologyinternational.com
APRIL 2010
Quick
MOTORSPORT
We join the fast set at
Michelin’s
€
1 million annual
sportscar test weekend
MACHINERY SPECIAL
The latest testing technology
can bring better products
to market in less time
BIOTECHNOLOGY
Rubber compounding
looks to Nature
for a cleaner future
thinking
Technology is accelerating
development times
Technology is accelerating
INTERVIEWS
Franco Annunziato Managing director, Bridgestone Test Centre Europe • Burkhard Wies Head of tire development, Continental •
Salvo Pennisi Head of motorcycle testing, Pirelli • Dr Gerald Potts • President, TMSI • Dr Shaun Immel CTO, Micro-Poise
IN THIS ISSUE
A
P
R
I
L
2
0
1
0
COVER STORY
16 Testing technology
The latest advances in tire testing technology are bringing higher quality products
to market faster than ever before
28
Quick
rapid development
rapid development
rapid development
Quick
REGULARS
News
4
Tire Technology International Awards
6
Demands for quicker development
times from vehicle OEMs are pushing
tire manufacturers toward new, faster
evaluation techniques
by John Challen
Tire Technology Expo 2010
8
Modular Tire Measurement System
28 www.tiretechnologyinternational.com
April 2010
www.tiretechnologyinternational.com
April 2010
29
Columns
10
Williams: Conference time
12
Walter: Rolling, rolling, rolling
“The issue is not just to get quicker,
but to reach performance targets
as soon as possible”
Franco Annunziato,
Bridgestone Test Centre Europe
48 University focus: Loughborough, UK
A group of UK-based researchers are investigating
the relationship between tire friction and temperature
52 Tire legends: Meet the Schraders
The Schrader family is still advancing the technology
it created a century ago: the tire valve
54 Production update
Global news, including Bekaert’s Bridgestone buyout,
Pirelli’s Russian deal, and Toyo’s expansion in China
56 Tire tail
Bob Powell, technical services manager at Continental,
discusses his lifelong relationship with tires
48
UNIVERSITY FOCUS
UNIVERSITY FOCUS
Hot stuff
Hot stuff
Hot stuff
Hot stuff
Hot stuff
Hot stuff
Hot stuff
Hot stuff
Hot stuff
Researchers at Loughborough University are investigating
the relationship between tire friction and temperature
by George Mavros, Loughborough University, UK
T
ires are recognized by vehicle
dynamicists as among the most
temperamental components
in any vehicle simulation
study. In a vehicle dynamics context,
tire models aim to predict the forces
and moments generated as a result of
the interaction between the tires and
the road surface. Such models require a
combination of contradictory attributes
such as computational efficiency,
robustness, accuracy, and ease of
parameter identification. Over the past
50 years, parallel to the evolution of
computers, a number of tire models
have been developed for vehicle ride and
handling analysis. These models range
from clever curve-fitting approaches,
such as the ‘Magic Formula’, to relatively
detailed models of the physics of tire-road
interaction. The latter, benefitting from
the ever-increasing computational power,
have tried to integrate a large number
of tire behavior attributes including
structural deformation, friction, and
thermal effects.
Current state-of-the-art tire models
have reached a good level of maturity,
but they often struggle to deliver accurate
results, especially when operating under
conditions substantially different to those
present when the model parameters were
identified. One of the possible causes
for such discrepancies is the delicate
relationship between tire temperature and
road-rubber friction. So far, in the name
of computational efficiency, tire models
for vehicle dynamic analysis with thermal
effects have been based on rather crude
representations of heat transfer, involving
mostly bulk or one-dimensional heating
models. The relationship between the
predicted temperatures and the generated
friction is usually based on experimental
measurements within a limited envelope
of operating conditions.
48 www.tiretechnologyinternational.com
April 2010
www.tiretechnologyinternational.com
April 2010
49
“A thermo-mechanical tire model
is being developed”
George Mavros,
Loughborough University
www.tiretechnologyinternational.com
April 2010
1
IN THIS ISSUE
36
Editor’s note
I
was lucky enough to take part in a tire evaluation
outpost
The last
test recently for the new ContiSportContact 5P high-
performance summer tire. Blasting around Spain’s
Monteblanco circuit in various exotica, I thought
I had discovered one of the perfect jobs. Not quite up there
with the position I dreamed of, involving a young Ursula
Andress, but pretty high on the list.
However, hours of track work, an increasingly stiff neck,
and numerous telemetry problems later, I was beginning to
flag and wonder if the job was quite as glamorous as I had
imagined it to be. Being given orders at every pit stop to
attack various corners and braking points in different ways
for the all-important data, the shame of the tell-tale graphs
after what felt like a hot lap, and I wasn’t so sure. What am
I talking about: of course it’s a great job! Hammering around
a track in a Porsche Carrera 2S and then being ordered to go
out and do several more laps with more aggression: what is
there not to like? Most of the time I forgot that my ham-fisted
cornering was actually garnering valuable tire evaluation data.
But let’s not forget the process that got these prototype
tires on to the cars in the first place. Intensive CAD work,
compounding work, weeks of lab research, and then
a thorough lab test program took place before our intrepid
professional test drivers could don their Ray-Bans.
And the speed of the test engineers is beginning to match
that of their Sparco-attired brethren, who don’t appreciate
that the guys in the white coats back at HQ might have more
to do with them controlling an SLS AMG on the track than
they do. The speed at which they can take a tire from design
to production is remarkable, as you’ll discover in this issue.
The working life and productivity of these engineers has
been considerably enhanced by the high-tech test machinery
available today, as you’ll find out in a few pages’ time. The lab
guys have never had it so good. But do they have it better
than the test drivers? I’m not so sure.
Find out more in the next issue, when I’ll share more
details about the tire evaluation program. Until then, keep
up the quick thinking.
Once a year, Michelin pours massive
resources into its annual sportscar
tire test. Is it a mere indulgence
or a valuable contribution to tire
development?
by Charles Armstrong-Wilson
36 www.tiretechnologyinternational.com
April 2010
www.tiretechnologyinternational.com
April 2010
37
“Racing moves quickly and easily
to the product on the road”
Nick Shorrock,
director, Michelin motorsport
FEATURES
28 Rapid developments
Find out what the experts are doing to accelerate
tire development times
36 Motorsport focus
We spend a weekend with Michelin at its annual
sportscar tire test
42 Biotechnology
A scientiic revolution in rubber compounding is coming
SUPPLIER FOCUS
25 TS TestingService
Find out the latest developments from this tire testing
machinery specialist
46 RockTron
The planet can beneit from a recycling technology
that is producing a range of eco-minerals
4
biotechnology
biotechnology
A new
Climate change and regulatory regimes such as REACH have established the value of
biotechnology in tire production, heralding a scientific revolution in rubber compounding
by Roger Williams
42 www.tiretechnologyinternational.com
April 2010
Adam Gavine
Editor
www.tiretechnologyinternational.com
April 2010
43
“This is clearly the time for
a fundamental step-change”
Roger Williams,
associate editor
Tire Technology International
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April 2010
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