|
|
|
|
|
The FSAE Tire Test Consortium (FSAE TTC) is an organization of Formula SAE teams who pool their financial resources to obtain high quality tire force and moment data. The FSAE TTC's role is to gather funds from participating FSAE teams, organize and conduct tire force and moment tests and distribute the data to all participating teams. The FSAE TTC is co-directed by:
Denny Trimble (University at Washington) was also a co-founder and director. The FSAE TTC thanks Denny for his considerable contributions and wishes him well in his current endeavors. Additionally, the FSAE TTC is supported by:
The FSAE TTC is not affiliated with Milliken Research Associates, Inc. We thank FSAE Design Judge Doug Milliken for donating this webspace and agreeing to oversee the finances of the Consortium.
SUMMARY FSAE teams join the FSAE TTC at a cost of $500 as per the conditions below. In return, they receive all tire data measured by the FSAE TTC. Tire data includes tire force/moments and spring rate info as described below. With registration, teams are allowed to vote for four tire constructions they would like to see tested--the most popular are tested. To date, two rounds of testing have been completed and additional tests may follow as time and finances allow. Tire data includes tire force/moments and spring rate info as described below, for more techinical detail please see the SAE paper by Kasprzak and Gentz.
TEST PROCEDURE The first round of testing at Calspan was conducted on 27-29 July 2005. Five constructions were tested:
The second round of testing at Calspan was conducted in early February 2006. Five constructions were tested:
Tires were donated by The Goodyear Tire & Rubber Company and Hoosier Racing Tire. Future tests of additional constructions may occur as funds allow. Currently a third round of testing is being considered for 2007. Details will follow. Data is collected in a series of sweeps. Slip angle sweeps--where the slip angle varies from near-zero to a maximum, through zero to a minimum and back to zero--are used for lateral force data. Slip ratio sweeps are used for tractive/braking data. Sweeps are taken at fixed values of inclination angle, inflation pressure, road velocity and normal load. A collection of sweeps at different values of these set points composes the test matrix. The first two rounds of tests used the following test plan: Slip angle sweeps at 5 loads and 5 cambers using nominal pressure Tests were conducted on Calspan's flat-belt tire test machine using 120 grit belt paper and a velocity of 25 mph. Static and Dynamic (rolling) spring rate tests were run in conjunction with the lateral force tests. Longitudinal Force tests cannot be run on 10" tires due to limitations of the Calspan test machine. For what it's worth, conducting these tests on 5 tire constructions would cost approximately $19000 for an ordinary customer at Calspan. The FSAE TTC has negotiating a reduced price, and Calspan is eager to support FSAE through these tests. Note that the details of the tests (specific loads, inclination angles, etc.) are subject to revision in future rounds of testing, but will keep the same spirit of the tests as described above.
ROUND 3 -- AUGUST 2007 The third round of testing at Calspan was conducted in early August 2007. Four constructions were tested:
The test plan is similar to that used in the first two rounds of testing, with a few additions. These tires were tested on rim widths of 6, 7 and 8 inches to measure the effects of rim width on the tire characteristics. The drive/brake tests were conducted at a few non-zero slip angles to measure friction ellipse effects. The test plan also included a tire wear study. Data from this third round of tests is being shipped by DVD during the first week of October, 2007. All consortium members will receive a DVD.
TEST OUTPUT A video record of the tire tests was recorded on DVD and is delivered to all consortium members. Members may also send a representative to witness any future tests in person (interested parties please contact Dr. Kasprzak for details). Data was collected at 10-20Hz. Output channels include:
Data is provided in both USCS and SI units. Milliken Research Associates has provided an MRA Nondimensional Tire Model of the tire data, and Stackpole Engineering Services has provided Pacejka-based models. These models are included on the DVDs.
USE OF THE DATA Consortium members are free to use this data in the design and construction of their FSAE entries, other school projects and related academic activities. Any publication or presentation of the tire data must acknowledge Calspan and the FSAE TTC. Individuals and teams are prohibited from donating or selling the data to any other individual, group, team or university, or posting it on the internet. Anyone wishing to obtain the data may do so by joining the FSAE TTC, regardless of their affiliation (i.e., non-FSAE teams or individuals are welcome to join the FSAE TTC, although they won't have voting rights on tire constructions to be tested). The data may not be used in any commercial application.
FINANCIAL DETAILS AND REGISTRATION Registration remains open. All registered teams receive data from the July 2005 tests, the February 2006 tests, the August 2007 tests (rounds 1 through three, respectively) and any future tests. Registration involves completion of the Registration Form and submission of payment to FSAE TTC. Finances are overseen by FSAE Design Judge Doug Milliken, who wrote the following:
The "FSAE Tire Test Consortium" (FSAE TTC) will operate as
follows:
Payment must accompany registration. Due to problems with
electronic
Make the check payable to: III. Contribution by Milliken Research Associates, Inc. MRA is pleased to donate the following to the FSAE TTC:
ACKNOWLEDGEMENT Thanks to Doug Milliken and Milliken Research Associates, Inc. for providing the space for this webpage.
|
|
|
|
|
 
|
