Atlanta93LE

iTrader: (5)

If you're doing a full ladder frame, differential displacements between corners would work fairly well for design, just remember to keep the design displacement small...very small...or you'll end up with an over-designed frame

Smaller braces, however, would be very difficult with displacements; you've got three translational degrees of freedom, and no information about their motion corresponding to vertical motion at the wheel.

Sidenote: When auto companies do physical chassis tests (when full FEA runs aren't enough), it's really cool. They use laser doppler vibrometers to track the underside of the car while it is sitting on four actuators. Neat stuff, those laser doppler vibrometers.

adbradley

iTrader: (2)

i think my wife has one of those laser dobbler vibrometer 2000s in the night stand next to our bed.... u mean i can use that thing to check the stiffness of my frame too!?!?

Loki047

iTrader: (6)

Yeah the laser vibrometers are fun, were using two of them for a vibrations study to reduce noise in gearbox boxes. Stupidly expensive.

Atlanta93LE

iTrader: (5)

But stupidly cool, too.

dc2696

iTrader: (2)

lol, its an amazing piece of equipment eh? lol

Why not just buy some racing beat chassis braces? They're relatively cheap seems like they work well.

zoom2zoom

iTrader: (5)

does it make you jealous....??

Loki047

iTrader: (6)

Who would be jealous?

adbradley

iTrader: (2)

hahahah na, she uses that, gives me more time to work on my car!

Sirnixalot

shipping for one....getting stuff here isnt hard just a little pricey.

HA....i found a pic of the autoexe one....im quite certain mine wont look that fancy but function over form

cjernigan

iTrader: (13)

Man that's sick. You could reproduce that almost exactly using rubing is you were so inclined. I might have to take advanced welding just so I have a designated class period to build my new mani/dp and some braces like those.
Makes me drool just thinking about it.

m2cupcar

iTrader: (5)

there's no way in hell those braces WON'T make a big difference. They've essentially closed up the entire "open" area on the underside of the car. Too cool.

dc2696

iTrader: (2)

Oh **** that is SICK!

btw where in the world are ya? I know shipping up here kills too but sometimes u gotta bite the bullet.

Sirnixalot

the car is in the cayman islands...im kinda inbetween there and england (university).

i want to do a diy version of the autoexe stuff, ijust need to get the car running on the TEC so i can leave it with my friend to put it on a lift and get that **** done as he has the time.

Atlanta93LE

iTrader: (5)

If I were you, I'd make a hybrid of that example and the FM butterfly. From that pictures, it looks like it ties into the floor. I'd attach to the "frame rails" as well.

rmcelwee

iTrader: (1)

Here's a page off the old SebringMiata.com (I keep a mirror of it on my server):

http://ww2.lightweightmiata.com:8080...ans/page3.html

(BTW, John's car is the one that got me started on my Red Beast project)

hustler

iTrader: (6)

If you can put one together, I'll buy it.