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SAE-RLDA Division Progress Meeting


SAE Fatigue Design and Evaluation Committee Meeting

Road Load Data Division

Unconfirmed Minutes

Cedar Falls, IA (April 4-5, 2000)

 

Tuesday, April 4 - Divisional Progress Meeting

  1. Christoph Leser moderated the meeting.
  2. Minutes from previous meeting were approved.
  3. The Rainflow standard format has been finalized and this project is closed. Al Conle will forward the results to be posted on the FD&E web site.
  4. The time history format project has been closed. There are various formats used commercially with reasonable acceptance in the industry. Also, there are many existing translators available to convert one format to another (ref. Fall 1999 minutes).
  5. ASCII data for web page – A common format for sequential data is needed to allow web page fatigue calculations. Andrew Whelan will investigate and provide a proposed format.
  6. A request was made for future presentations addressing the statistical analysis of road load measured data. Also talks dealing with "why" we collect road load data and "what" we do with the data would be desired for future meetings.
  7. Christoph Leser gave a presentation entitled "Modeling of Non-stationary Variance in Vehicle Loading Histories".
  8. A discussion evolved about the purpose of field data collection with respect to the ATV project. Several data runs with 58 measured channels have been collected on the ATV while operating at SunDown (Dubuque, IA) ski slopes. Dynamic modeling folks would like to have data collected while the vehicle traverses discrete events or test tracks of known profile. This data would be used for correlation purposes to the dynamic models. Mark Earley and Steve Edwards will follow up on this idea with the possibility of running the instrumented ATV over test tracks at Deere, in Moline. Dan Klann also suggest the possibility of collecting data on the Deere test tracks at Waterloo.
  9. Additional discussion on the advantages (and disadvantages) of basing dynamic modeling on wheel loads or known road profiles was conducted. It appears that the Road Loads Division will provide both types of data. It was encouraged that individuals model the ATV using their preferred methods and report the results back to the general committee.

Wednesday, April 5 - Divisional Planning Meeting

Christoph Leser chaired the meeting.

Analysis of data collected on the ATV at the SunDown ski slope was discussed. Mark Earley will do some data reduction (noise spike replacement, drift removal, etc.). He will also do the conversion of the wheel forces and moments from rotating coordinates to non-rotating coordinates. The data will then be placed on the FD&E web site. Gary Mauritzson will provide data to Christoph, probably in nCode’s dac format (see item 4 above). Run descriptions, channel descriptions and vehicle configuration details will also be posted (including photos and video).

There was some discussion about the process of data reduction of the ATV data. Charlie Sieck and other individuals would like to do this procedure as well. The raw data will be sent to them upon request to Mauritzson. It is desired that anyone participating in this exercise present their results at the next meeting.

Gary Mauritzson and others from Deere committed to running the ATV over the Deere test tracks at Moline. Individuals doing dynamic models have requested this data. Information will be provided to describe the profile of the test tracks and any discrete events.

ASCII data file format was discussed. It was suggested to check out the Windows.ini file formats for this purpose. Andrew Whelan was assigned to do this.

The meeting was adjourned.

Minutes submitted by Ray Thompson