SAE Fatigue Design and Evaluation Committee Meeting

Unconfirmed Minutes

Bloomington, MN (October 19-21, 1998)

Christoph Leser moderated the meeting.

Deferred discussion of the Rainflow Format Standard and the Time History Standard status to the planning session.

David Salmon, from MTS, gave a talk on "Spinning Wheel Integrated Force Transducer". He discussed some of the design considerations including weight and durability of the transducer. The transducer fits between a reclaimed hub and wheel and can fit on passenger vehicles. The transducer measures the 3 forces and 3 moments going into the vehicle from the tire.

Christoph Leser chaired the meeting. The minutes from the previous meeting were approved.

Rainflow standard – No progress was made since the last meeting.

Time history format - Andrew Whelan has plans to send out a request (survey) for receiving comments on the need for a time history format standard. There was discussion amongst the group that there may not be a need for a standard format for time histories. One thought was that if the FD&E group can share time histories through the ATV project without problems, there may not be a great need in the industry for a time history format standard. Also, various "open formats", with reasonable acceptance in the industry, already exist.

Statistical analysis of data – Darrell Socie presented work from Jason Roth’s (former grad student) thesis on predicting future loads based on existing loads. Darrell gave a couple of examples of how the prediction process works with multi-pass data and multi-operator data. This process assumes the application or operation is similar. Darrell is interested in receiving load history examples from industry to try out the process. Darrell will make Jason's thesis available to Christoph Leser from whom other committee member can receive copies.

Christoph Leser will check with Virginia Tech on the work they were doing with statistical analysis of data.

ATV Contributions:

A channels list was provided by Darrell Socie. This list is what is used at the UIUC for student projects. The list includes front and rear suspension characteristics.

Some discussion about the need to instrument and measure the loads generated by the operator was conducted. These would include the seat, handle bars and foot pegs. Zhengxian Bai will investigate doing this.

A discussion about collecting load histories from other applications (besides the plywood course) was conducted. This could include ski slopes and trails in woods. The recommendation was not to collect additional load histories at this time. The effort of the group should concentrate on correlation the existing loads to digital models, not in trying to understand the customer use of an ATV.

New Business:

None

The meeting was adjourned.