Yupp, just modify the code some. There is a section that has Fz=-[50:50:350] just replace that with a single load. Same for IA, mu etc...just keep in mind this is IA not camber so keep your signs right!

Also if your interested in a single point above the area that does the plotting there is some commands to output a specific point of interest.

Scott
Rutgers FSAE
Suspension Team Lead

Budget sheet stop updating? Or has there been zero buy-in since Feb?

Any new news with the TTC forum?

I finish finals this week and if nothing has happened, I will have time around the end of this week to invest towards making a private forum happen.

I currently have my team's forum hosted for free through freeforums.org, no php coding experience necessary.

quote:

Originally posted by exFSAE:
Budget sheet stop updating? Or has there been zero buy-in since Feb?

Thank you for the reminder--TTC accounting is in good order but due to a communication slip we failed to update the spreadsheet on the website. Reload the page and try now. There are about 40 new members since Feb 2008.

http://www.millikenresearch.com/fsaettc.html

-- Doug Milliken for the TTC

quote:

Originally posted by Anvit Garg:
Any new news with the TTC forum?

I finish finals this week and if nothing has happened, I will have time around the end of this week to invest towards making a private forum happen.

I currently have my team's forum hosted for free through freeforums.org, no php coding experience necessary.

Thanks for following up, it's nice to finally have a choice! We also have an offer from Brian at Washington State University FSAE to set up a TTC site on their private server. He and I had a short discussion including the idea of having both a forum for discussion and a separate wiki for longer term reference.

I wonder what the pros and cons are between using a private server and a public service like freeforums.org ? Feel free to discuss here on FSAE.com, or email me if you prefer at doug dot milliken on gmail.

-- Doug Milliken for the TTC

I would think a public service might be idea. Given the turnover rate of FSAE students, changes in departments etc, for long-term stability and maintenance a public location could work very well.

I agree, long-term wise it would be best to have a public host.

But then that is another cost. I believe not too much since you do not have to register a new domain if you host through a public service.

Also if the private server crashes, assuming there are less frequent back-ups, that would be another problem.

quote:

Originally posted by DougMilliken:

quote:

Originally posted by exFSAE:
Budget sheet stop updating? Or has there been zero buy-in since Feb?

Thank you for the reminder--TTC accounting is in good order but due to a communication slip we failed to update the spreadsheet on the website. Reload the page and try now. There are about 40 new members since Feb 2008.

http://www.millikenresearch.com/fsaettc.html

-- Doug Milliken for the TTC

I think you might have missed University of Houston, we had purchased the data recently.

quote:

Originally posted by Anvit Garg:
I think you might have missed University of Houston, we had purchased the data recently.

You are on my master list, will appear the next time the website is updated.

Side note, I had trouble convincing Firefox3 to reload the page and get the updated spreadsheet, it keeps giving me an old one from page cache--finally gave up and started IE which did the job.

quote:

Originally posted by exFSAE:
I would think a public service might be idea. Given the turnover rate of FSAE students, changes in departments etc, for long-term stability and maintenance a public location could work very well.

I would think the exact opposite would be true. You are correct about turn over rates for team members, but maintaining a forum takes almost no time after it is set up, and correct my if I'm wrong, but you are no longer on a team and still active within the FSAE community. Even if a public server is used, you still need someone to maintain the account, so turnover of whoever is running it is an issue either way.

I have always tried to stay away from "free" hosting services. I have never seen the one mentioned, but my experiences with places like that in the past have not been great. From what I have seen you can't get free service and good service. Typically to cut costs they will over sell their equipment, so reliability becomes an issue. Also, given that they aren't charging for their services, where does their revenue come from? Running a commercial server costs money, both in people and real estate. I have a lot more confidence that a college departmental server will still be there is 5 years than a free hosting company.

Setting up a forum requires little knowledge of PHP, mostly you just have to set some variables with information about the database location and username/password. Anyone who can figure out how to work with TTC data in Matlab should be able to handle this without even thinking about it.

This may or may not be an issue, but I'm somewhat paranoid about sending data to random people across the internet. If we are trying to set up a private forum to discuss the tire data, what makes you trust a free hosting company with that data?

Doug and I have also been talking about having a wiki in addition to the forum as a place to answer common questions. This would probably be hard to do with a free forum hosting place.

OK, that’s it for my rant. Personally I would rather one of the teams’ hosts this forum, but either method would probably work just fine.

Brian-

You are correct that I am no longer on a FSAE team. I am however still directly active in the community.

All I know is my university's own experience. With the couple times our computer lab was upgraded, servers changed over, admins changed, access rights, etc.. it would have been tough to keep something steady over time.

In any event, I didn't say "free," I just said public.

Just my 2 cents.

My university obtained the TTC tire data two years ago but it is only this year that we decided to try to make use of it.

I've been doing some simple simulation on MATLAB to try to get some data that makes sense and that can be useful.

Here's a quick explanation of what I did and what my problem is:

I'm running test3 MRA goodyear 20x7x13 - 7 rim data at 12psi, 2deg IA. I'm running ExpansionType = 4; % FY = f(FZ,SA,IA,mu)

instead of having a loop for the normal load, i'm setting it to 245lb. when the graph is plotted, my peak does not match my graph. what i mean is that the curve's peak is somewhere, and the dot that indicates the peak is off by 1deg SA and 100lb of FY. is this correct or there's a problem somewhere?

I've found the peak finder in the MRA models appears to be temperamental at best. If you use the loop to plot graphs and peaks for a couple of different tyres, you'll see that sometimes you see peaks that are no where near the graph, sometimes even of reversed sign. I would definitely believe the apparent peak on the graph rather than that indicated by the peak finder.

It's hard to know why it happens because the code for the models is a 'black box', but I'd suggest if you want to use the peak values for some other purposes, then you generate them yourself by looping through several slip angles and then simply reading the highest value in the output matrix (I haven't tried, but I bet there's a MAX function or something built in to Matlab that'll make life easy)

The TTC forums are now up. When you register you need to use a university email address, this is used to verify TTC membership. I’m assuming that a lot of people will be registering in the coming week, so it may take me a while to approve your registration request.

The forum can be access at: http://sae.wsu.edu/ttc

excellent. Do people feel it's sufficient identification that someone has an email address that is from a member university? Auckland has around 30,000 students, all of whom have @aucklanduni.ac.nz email addresses, but less than 30 are in the FSAE team. Should there be an extra identification required by an assigned member from each university? It's a lot more work, guess it depends what kind of information will be posted and how private it is desired to keep this data. Is there any consensus as to what is and isn't acceptable to discuss/post on the forum?

There's also the issue of what to do about industry guys that have supported the TTC (Goodyear, Hoosier, Stackpole, etc.)

Malcolm, you bring up an interesting point about other students at a member university. I hadn't thought of that, do you think other students trying to join will actually be an issue? If you have a simple way to ensure that someone is actually on the FSAE team, I'm all ears. Keep in mind that there are 199 members, so simple is key. I don't know now current the contact info is either, so telling everyone what the method is could also be a problem. Not saying its impossible, just that it would be a lot of work.

Zac, I'm going to take the easy way out and say that I'll leave that up to Doug and the other TTC organizers. Right now Doug Milliken, Bill Cobb, and Dr. Woods have accounts.

Bill Cobb is a TTC organizer?

Supplies.

http://www.youtube.com/watch?v=nmo_dkNZIHM

quote:

Originally posted by Brian S:
Malcolm, you bring up an interesting point about other students at a member university.
....

As I've been interpreting the TTC license, once a university/college/school joins, the data is available to any researcher at that institution. For example, a couple of TTC memberships have been paid by university libraries (clever way to stretch an FSAE/FStudent budget!) and the librarians maintain the data in a location that is only available to their students & faculty. This new private forum may be a good opportunity to revisit this policy if anyone feels that there is abuse of the TTC license?

quote:

There's also the issue of what to do about industry guys that have supported the TTC (Goodyear, Hoosier, Stackpole, etc.)

I think it's to everyone's advantage if the TTC supporters are allowed to join the private forum--if anyone has a reason to object perhaps they could post it here?

In answer to another post, Bill Cobb is the newest addition to the list of TTC supporters.

-- Doug Milliken for the TTC