Thank-you for your many years of service to the student engineering community. Your contribution has elevated the competition to higher heights and ensured an impeccable safety record. Your efforts...
Type: Posts; User: Gareth
Thank-you for your many years of service to the student engineering community. Your contribution has elevated the competition to higher heights and ensured an impeccable safety record. Your efforts...
I have found it useful to define the governing equations that dictate the behaviour of the diff:
Input Torque = Output Torque Left + Output Torque Right
(Ignore losses)
Locking Torque = (Input...
Conor, it sounds like you're driving OptiStruct in the right way - use a mass constraint with a minimum WCOMP response as your design objective. This will produce the stiffest structure for a given...
First, you should read a book on FEA. Garbage in is always garbage out. There is a lot to learn in this field...
Mechanica uses a variable order 'p' element (the p is for polynomial) unlike most...
From the 2 design finals I've been in I'd say the laptops are of some benefit, but they certainly shouldn't be the highlight of the show. Most of our talking points were on the design boards and you...
You should get a copy of HyperWorks from Altair (free for FSAE teams). HyperMesh has very good tools for building composite models (with lots of tutorials) and OptiStruct can help you do...
You should consider using HyperMesh and OptiStruct for your chassis models. If you're running a stick model (1Ds) then it'll definitely be worth your while. Once you have the overall configuration...
http://www.plascore.com
Historically UW has run pullrod suspensions for the CG benefits and the buckling requirements. We tried a few different configurations, each with its own pros and cons. Last year we switched to...
Billy,
No I did not bother with gap elements, though that may have been interesting. I just use RBE3's to allow the bearing bores to move around a little. If I was looking to do a detailed...
I'm not a Cosmos user and I'm an FEA snob...so I hope this is useful. :-)
I've run OptiStruct topology analyses on bellcrank/rockers, which should probably have a similar setup to your Cosmos...
Plot the raw data from the tire testing. If you look at the surface temperatures for the tires tested in the second round of testing you'll see that they're much lower. I suspect that the belt...
The UW monocoque cars started in 2001 with a roll-hoop forward carbon tub. We won the design event that year with the comments that it was the first tub done 'right'. Of course it wouldn't stand up...
Sometimes it surprises me how little knowledge is shared here...
First, the amount of energy input into your rear brakes, one or two rotors, is roughly fixed based on your bias bar settings. If...
I believe UWA's anti-roll is built in to their hydraulic system. That was (may have changed) one of the downsides of their design because it wasn't simple to change the roll distribution of their...
Okay, not enough time right now for a full response, but so far this thread is going great!
What about using the pull/pushrod forces for evaluating contact patch load variation? I know this is...
Hello All,
I'm going to give this a shot - a decent thread about tires, dampers and all in all fun vehicle dynamics stuff...that I hope will stay civil.
Here are a few things I've been thinking...
I noticed that this equation was omitted from Stackpole's overview of the Pacejka model. Without too much hassle I found the equations also listed in the ADAMS/Tire documentation at:
...
Yeah, I've seen the MRA model and the Stackpole curve fits, but if you want to efficiently look at the raw data then you need some kind of utility. I wrote some scripts to chop up the data into...
Evolution is right. Over the past 4 years at UW I've seen our cars progress massively from our design winning car in 2001 and I believe a great deal has to do with better communication with other...
You should load your FE model using a torsion fixture similar to what you use to test in real life. Look for previous torsion fixture threads for a description of how to twist the car without...
I'd be interested in that model if someone could please send me a copy. Does anyone know if this is the same Pro/E model that's been floating around for a few years? I believe it was roughly cad'ed...
Sorry Denny, the stiffness claims comment wasn't directed at you or your team specifically. Few teams seem to look at how to properly load the chassis in torsion (proper constraints during fea and...
[QUOTE]Originally posted by Denny Trimble:
If you want some benchmark numbers, the top teams in Detroit claim to have frames that average 2000 to 3000 ft-lbs/deg (frame stiffness, loads applied...
As far as I know, most rotors are low carbon steel or cast iron. Higher carbon contents will heat treat during operation, become brittle and lose their strength as the carbon diffuses out. I...