Decoupled suspension

[Zynerji]

Not sure if this is the place, but this was eye opening for me!

[Stu]

Not sure if this is the place, but this was eye opening for me!

That is a very interesting video!
I had a linked hydraulic system on my drawing board for ages (way too many years ago!), that was part of very outlandish car design/concept. I was attempting to creat something that would work without electronic control to effectively decouple (although I didn’t know that it called decoupling at the time!) all four suspension modes. I never did fully solve it…

[NL_Fer]

I believe the current rules doesn’t allow for an actual interconnect (FRIC) between front and rear. But the designers have to simulate the same effect, without an interconnect and only the 3 springs/dampers on each axle.

[Stu]

I believe the current rules doesn’t allow for an actual interconnect (FRIC) between front and rear. But the designers have to simulate the same effect, without an interconnect and only the 3 springs/dampers on each axle.

This is true, no interconnection between each axle.
For this year, any connection across an axle must be by mechanical means only.

[henry]

IIRC, Malcolm Smith, Cambridge Professor, made a model of a fully decoupled suspension, I think the connections were hydraulic. I had a paper describing it, but I’ve lost it.

The inerter is a more famous contribution of his to suspension technology.

Edit: the paper is titled “ Interconnected vehicle suspension”, MC Smith GW Walker , 2005. I can’t find an online copy but it might still be available somewhere.

[Greg Locock]

One of the best lecturers I had. The Kinetic suspension allows for fully hydraulic interconnect and was used in a UWA FSAE car, and various Toyotas. https://en.wikipedia.org/wiki/Kinetic_D ... ion_System

There's a valve block in the interconnects which can be as complex or simple as you like.

[Stu]

IIRC, Malcolm Smith, Cambridge Professor, made a model of a fully decoupled suspension, I think the connections were hydraulic. I had a paper describing it, but I’ve lost it.

The inerter is a more famous contribution of his to suspension technology.

Edit: the paper is titled “ Interconnected vehicle suspension”, MC Smith GW Walker , 2005. I can’t find an online copy but it might still be available somewhere.

Thanks Henry, I’ll try to search for it.

Is this it?
http://www-control.eng.cam.ac.uk/Homepa ... l_1014.pdf

[Greg Locock]

http://www-control.eng.cam.ac.uk/Homepa ... l_1014.pdf

[henry]

Yes, that’s it. I guess all search engines are not created equal, or maybe search operators. I only found references, not the paper itself.

[Tim.Wright]

I did some analysis on the characteristics of an interconnected suspension here a few years ago. My version had no warp stiffness.
viewtopic.php?p=574169#p574169

[Stu]

I did some analysis on the characteristics of an interconnected suspension here a few years ago. My version had no warp stiffness.
viewtopic.php?p=574169#p574169

That is excellent, thank you for sharing it again!

[Honda Porsche fan]

Does the decoupled suspension have anything to do with the the Benetton Renault Tuned Mass damper of 2005 that was banned ?

If not, could you add a tuned mass damper to a decoupled hydraulic suspension or FRIC with added benefits or will it be redundant or cause negative issues?

The tuned mass damper was tuned to counteract yaw motion.

"How Renault F1 won a World championship by creating the tuned mass damper."...
https://mooregoodink.com/how-renault-f1 ... ss-damper/

[johnny comelately]

Not sure if this is the place, but this was eye opening for me!

That is a very interesting video!
I had a linked hydraulic system on my drawing board for ages (way too many years ago!), that was part of very outlandish car design/concept. I was attempting to creat something that would work without electronic control to effectively decouple (although I didn’t know that it called decoupling at the time!) all four suspension modes. I never did fully solve it…

Jules Bianchi's uncle designed a system that separated bump and rebound both in springs and damping, he approached Peugeot and others but it didnt break into the mainstream.

[henry]

Does the decoupled suspension have anything to do with the the Benetton Renault Tuned Mass damper of 2005 that was banned ?

If not, could you add a tuned mass damper to a decoupled hydraulic suspension or FRIC with added benefits or will it be redundant or cause negative issues?

The tuned mass damper was tuned to counteract yaw motion.

"How Renault F1 won a World championship by creating the tuned mass damper."...
https://mooregoodink.com/how-renault-f1 ... ss-damper/

The mass damper on the car handled heave and pitch.

The yaw that is referred to is on the wind tunnel model.

[Honda Porsche fan]

Does the decoupled suspension have anything to do with the the Benetton Renault Tuned Mass damper of 2005 that was banned ?

If not, could you add a tuned mass damper to a decoupled hydraulic suspension or FRIC with added benefits or will it be redundant or cause negative issues?

The tuned mass damper was tuned to counteract yaw motion.

"How Renault F1 won a World championship by creating the tuned mass damper."...
https://mooregoodink.com/how-renault-f1 ... ss-damper/

The mass damper on the car handled heave and pitch.

The yaw that is referred to is on the wind tunnel model.

Does a fully decoupled hydraulic suspension with FRIC remove the need for a mass damper? Or could a mass damper be added with additional benefits?