Qatar Rd 1 2017

JohnnyKnockdown said:

He meant mass diaper. Ducati won the 07 championship with their rider using one

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#22 said:

It's a system that was used in F1 in the mid 2000's to counter the vertical movement of an unsprung mass which basically evened out the variations in loading of the tyres which in themselves act like a spring, and the suspension itself. Fir example if you hit a bump or have a change in weight transfer, the loading of the tyre changes like a waveform as the load is dampened out. A mass damper evens out the fluctuations.

Given that the mass dampers used in F1 were about 9kg (approx. 20lb), I personally can't see that such a small box on the tail of the GP17 is that heavy and even if it was, would do much to counter anything on the front end. As best it would stabilise the swingarm squat fluctuations under load (acceleration). That's just my opinion of course.

ETA: Found some more images to explain the operation::

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Dr No said:

#22. I spec mass dampers as part of my job (Hello Trelleborg), was kinda a rhetorical question. I wouldn't mount one there for front end issues.

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JPSLotus said:

But seriously...Ducati was playing around with mass dampers in 2014 in testing but it never made it to the GP14...

Article from back then about it...

https://translate.google.com/transl...le-ali-ai-mass-damper.html&edit-text=&act=url

Hard to say if the GP17 really is sporting one like Arrab said, or if it's just electronics repositioning. I will say that if they are running them, they must have figured out a way to really clean up the packaging on it from the 2014 testing.

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moto vudu said:

Motogp.com has a 2017 Technical Analysis video that says it's simply a housing for electronics and it's placed at the tail to alter the center of gravity.

MotoGP?

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In last week’s blog I told the story of Wayne Rainey’s Team Roberts engineers who accidentally created their own anti-chatter damper in the very early days of data-logging.

“We learned about chatter and the moment of inertia of the frame in a strange way,” recalls Tom O’Kane, GP racing’s first full-time computer expert who now works for Suzuki. “We used to run a data-logger in the seat hump of Wayne’s bike during practice. Everything would go perfect, then the mechanics would remove the unit on Saturday night, to save some weight for the race.

“Wayne would come in after the race, saying, 'what the .... happened? The bike chattered its brains out!' Hmm, we thought, it must have been a dodgy tyre. This happened at three races in a row and finally we realised that the datalogger sitting inside the seat hump was curing the chatter. The unit only weighed two kilos, but it was a long way from the centre of the bike. The moment of inertia increases by the square of distance, so if you double the distance from the centre of the bike you quadruple the effect.”

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JPSLotus said:

My only question then is if it's having any impact beyond the COG.

Mat Oxley talked about it back in February when Team Roberts stumbled over something inadvertently...



An anti-chatter jounce box? | Motor Sport Magazine

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sramsay said:

Looks like thunderstorms again today. Could disrupt the warm-up sessions. Hopefully they miss the circuit.

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JPSLotus said:

But seriously...Ducati was playing around with mass dampers in 2014 in testing but it never made it to the GP14...

Article from back then about it...

https://translate.google.com/transl...le-ali-ai-mass-damper.html&edit-text=&act=url

Hard to say if the GP17 really is sporting one like Arrab said, or if it's just electronics repositioning. I will say that if they are running them, they must have figured out a way to really clean up the packaging on it from the 2014 testing.

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Dr No said:

I wouldn't put much stock in that article. Jounce is merely upward wheel movement, but journo gotta baffle with ......... Chatter isn't "resonances" in the chassis, etc exciting the tyre, if anything it's the other way around. The Rainey anecdote is pretty interesting, though.

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Daniboy said:

It has been on Monday once, won't happen again imo

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Arrabbiata1 said:

I'd be genuinely very interested to hear your views on this. Incidentally, don't Trelleborg specialised in automotive seals - pistons and rods, engine mounts and suspension? Are you working in conjunction with vibracoustic? Everytime I've visited San Francisco I've always been fascinated by the tuned mass dampers/harmonic absorbers on the skyscrapers - the same in Tokyo. It's the unprotected five or six brick storey brick buildings hastily assembled in the 20s and 30s that are so lethal though. Are Trelleborg also involved in civil engineering?

So, what's in the box Doc? I'm favouring non-isentropic 'stimulation'.

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