Red Bull Technology post-rig shaker - RB4

[Kiril Varbanov]

Hello and Happy New Year to all.

My dear friend Mario (@techf1iles) has graciously shared this video of RB4 being tested on post-rig shaker:
http://www.youtube.com/watch?v=ZnrnqYAOcpU

At the end of the video there are actual numbers and parameters that are being measured. I hope you will like it.

[timbo]

Nice vid!
I wonder, why there's no steering action on the 7-post?
The driver looks like Martin Brundle

[Jersey Tom]

I wonder, why there's no steering action on the 7-post?

Not a huge need for it. 7-post rig is a tool for a specific job, doesn't particularly need to be all-encompassing. For that matter there are no lateral or longitudinal loads applied at the tires, nor are the tires rotating or deflecting under those in-plane loads.

For the questions they're trying to answer using the rig, steer action may not be particularly important or influential.

[mep]

Can anyone please name the 7 directions they apply forces to the car?

For that matter there are no lateral or longitudinal loads applied at the tires, nor are the tires rotating or deflecting under those in-plane loads.

Well, the tires will deflect when you apply forces in z-direction (downforce).

[Blanchimont]

Can anyone please name the 7 directions they apply forces to the car?

I don't think you can speak of seven directions as from what i see in the video, the actuators can only move in one direction (vertical). The seven relates to the number of points where forces are applied, in the video the four tyres and three points at the chassis. Watch at 0:30 for the one between the front wheels and at 3:00 for the two at the rear.

There are even 8 post rigs, note the car has some formulas on the bodywork

http://photography-on-the.net/forum/sho ... p?t=786907


And from beneath the rig looks something like that.

http://www.kw-suspensions.eu/int/kw_7post_test_dyno.php

[lotus7]

And there's your flexi nose , right at the start of the vid .

[wesley123]

Just regular part flexing, nothing special

[strad]

+1 lotus7
Just testing how much the supports flex,,that's all.

[wesley123]

1. Why would they show such secrets in a promo video?
2. Stress is applied to the part in different directions, it would be a wonder if it didnt flex in any direction.
3. It is the 2009 RB5 nose, I cant remember seeing or discussing any flex on that one, by anyone

Nothing special going on, just normal flex from the forces applied.

[PlatinumZealot]

ageed, Even street car metal body panels flex, and flex waaaaaay more than that.

[mep]

Guys, can you do me a big favor?
When you want to discuss flexi noses go somewhere else.
It's a too good topic to get ruined by bullshit.

I don't think you can speak of seven directions as from what i see in the video, the actuators can only move in one direction (vertical). The seven relates to the number of points where forces are applied, in the video the four tyres and three points at the chassis. Watch at 0:30 for the one between the front wheels and at 3:00 for the two at the rear.

There should be a general definition where the actuators are attached for the different rigs.
Example: 4 post rig, under the four tires.
And so on....

[strad]

Guys, can you do me a big favor?
When you want to discuss flexi noses go somewhere else.
It's a too good topic to get ruined by bullshit.

When ya show a video of them seeing just how much flex they can build into it, what the hell do you expect?
Get real...it ain't a "good" topic..it's a video.

[mep]

It's is a good topic because we have not talked much about rig testing here before, even though there are some guys around which have good knowledge of that (DaveW for example).
Topics about flexing parts related to RedBull are more then enough around here and newer where interesting at all.

[Jersey Tom]

There should be a general definition where the actuators are attached for the different rigs.
Example: 4 post rig, under the four tires.
And so on....

Pretty straight forward, fundamentally not many options. 4-post rig is wheel pans only, vertical actuation of each tire. If you want to add inertial and aero loads on the sprung mass... you have x/y/z, thus you need 3 actuators = 7 post. If you want to add warp, you need one more actuator for 8.

Wouldn't make much sense to have a "5 post rig" of pure downforce actuation (i.e. without drag moment), or no inertial loads. Similar with "6 post". Or, 2- or 3-post. 4-, 7-, and 8- are the only combinations I know of.

And even then, as I say.. post rigs are just one tool in the toolbox. Not the end-all-be-all of car setup.

[thisisatest]

did anyone notice how slowly the rear shock extends once it comes to rest?