Video Exclusives


Historical footage from Marangoni

Sentury

The Italian supplier looks back on its beginnings as a developer of tire production and retreading machinery.

Click here to watch the video


A factory tour

Sentury

Visit Continental's factory in Otrokovice where more than 21 million passenger and light freight tires are produced a year

Click here to watch the video

What do you think about Michelin's Vision tire concept? Video here.

Web Exclusive Articles

« back to listing

Indoor EU tire label research at NTRC

At the National Tire Research Center in Alton, Virginia, USA, research is being conducted into the replication of EU noise and wet grip tests on an indoor rig 

by Graham Heeps

 

Of the three tests specified by EU tire labeling legislation, only rolling resistance is currently conducted indoors on a test rig. Industry experts believe that in the long term, the wet grip and tire noise tests could also be brought off the proving ground and onto the rig, and research is now underway to this effect.

One such project is at the National Tire Research Center (NTRC) in Alton, Virginia, where a team led by technical director Kevin Kefauver has conducted wet grip and noise tests on the facility’s MTS LTRe Flat-Trac machine.

For wet grip, the team took advantage of the LTRe’s large controlled braking capacity and wet-test capability. “We wanted to see how well we could predict the label value,” explains Kefauver. “We took five different European tires that were already labeled, ran the EU test procedure on the machine and compared them to the label values.”

The tests were conducted on the machine’s regular 120-grit test surface. “We found that we predicted a lower grip level than on the label, but we know that the surface we were using had less texture depth than the EU test standard,” Kefauver explains. “With that in mind, one of the things we’re working on in the first half of this year is being able to apply a more porous surface to the belt.”

Unlike in the wet grip scenario, the outdoor label test for noise could not be replicated on the rig because it is a pass-by measurement. “Instead, we measured the sound at the contact patch,” Kefauver explains. “We installed a small acoustic chamber around the test tire and used an industry-standard sound-intensity probe to take the sound measurements.”
 



Again, labeled tires were measured on the machine and the results rank-ordered for comparison with the official label values. As was the case with the wet-grip results, the rank order was similar to the official label values.

“The delta between the loudest and quietest on the label values was also very similar to what we’d measured on the machine,” he notes. “Given our results, people can already come and take advantage of the measurements we can make. If people are working on radiated tire noise, lab testing can be done earlier in the cycle than might normally be the case, and can help guide the development direction. It can certainly rank order their tires, and help predict what the final label value might be.”

For both testing scenarios, repeatability between tires of the same construction were very good, but more development work will be required. For noise testing, that means further investigating the relationship between the indoor test at NTRC and the outdoor label test. For wet grip, it’s all about the surface.

“To get a deeper surface, we can use the technology we developed for our cleat testing to create one long, non-uniform surface that we apply to the belt,” says Kefauver. The material is likely to be a very high-durometer rubber, although he acknowledges that the tricky possibility of putting asphalt onto the belt – and thereby providing an even closer relationship to an outdoor surface – “is something we think a lot about”.

For Kefauver and his colleagues, more research beckons...
 

April 28, 2015

 

Read Latest Issue

Read Latest Issue

Read Latest Issue

Web Exclusives

Q&A with Jeff Barna, Yokohama
The newly appointed COO discusses key trends and challenges – including his plans for the company, raw material prices, and expansion plans in the USA
Read Now

Conti celebrates 50th anniversary of the Contidrom
The German tire giant looks back on 50 years of history at its flagship test facility
Read Now

Interview: Giuliano Menassi, head of R&D, Pirelli
The R&D expert discusses how the latest technology trends are affecting the way in which R&D is conducted at Pirelli
Read Now

In it to win it
Dunlop, which is now in its second year of competition with Aston Martin in WEC, says a new regulation will enable greater transfer from track to road
Read Now

Goodyear to supply British Truck Racing Championship
Challenges tackled in truck race tire development could lead to the creation of advanced new road tire technologies
Read Now


Supplier Spotlight

Supplier SpotlightWe are building a list of leading suppliers covering all aspects of the tire industry. Want to see your company included? Contact olivia.campbell@ukimediaevents.com for more details.

فروشگاه اینترنتی فروشگاه اینترنتی سیستم همکاری در فروش کانال تلگرام چت روم دانلود فیلم فروشگظ;ه اینترنتی

Submit your industry opinion

Industry BlogDo you have an opinion you'd like to share with the tire technology community? We'd like to hear your views and opinions on the leading issues shaping the industry. Share your comments by sending up to 500 words to rachel.evans@ukimediaevents.com

Submit Your Recruitment Ad

Recruitment AdTo send us your recruitment advertising or to receive information on placing a banner please email olivia.campbell@ukimediaevents.com