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SAE-RLDA Division Progress Meeting


SAE Fatigue Design and Evaluation Committee Meeting

Road Load Data Division

 

Unconfirmed Minutes

Manhattan, Kansas (March 31 - April 01, 1998)

 

Tuesday, March 31 Divisional Progress Meeting

  1. The minutes from the previous meeting were approved.
  2. Mark Pompetzki gave a status report on the Rainflow Format Standard.
  3. Andrew Whelan gave a status report on the Time History Standard.
  4. No report was given on multibody dynamics modeling project.
  5. Christoph Leser gave a status report on statistics analysis of multipass load data. He mentioned three approaches that are being used; rainflow histograms, exceedance plots, and time histories.
  6. Jason Roth, University of Illinois, gave a presentation on "Statistical Aspects of Load Histories". He uses exceedance plots along with rainflow histograms in the analysis. The analysis is used to predict load history results for a common operating condition if the condition is allowed to happen in the future. Also, for example if 10 runs are available the 99 percent load history can be predicted.
  7. Arthur Tang, Engineering Technology Associates, gave a presentation on "Virtual Proving Grounds". The presentation showed several examples of using computer modeling to predict stresses in various components during dynamic events.
  8. Alan Belfield, ARUP, gave a presentation on "Vehicle Performance Simulation".

 

Wednesday, April 01 Divisional Planning Meeting

Dan Morrow chaired the meeting. He announced that Christoph Leser will be taking over the duties of chairperson as of Fall 1998 and Ray Thompson will continue as vice-chairperson.

Rainflow standard - Mark Pompetzki lead a discussion about the current format of the proposed standard for rainflow data. The major uses for rainflow data are: fatigue life predictions, reconstruction of data, and manipulation of data. Mark would like to see some enhancements to the format for manipulation purposes. The enhancements include adding the bin numbers, including ½ cycles, adding from-to counts and including multi-channels in the file format. Mark will provide a sample of the proposed rainflow format with enhancements to the committee for approval.

Time history format - Andrew Whelan lead a discussion about the need for a common time history format for transferring data among various users. Some of the formats discussed were, nCode’s dac files, MTS’s RPCIII, and Somat’s sif files. Andrew will talk to these companies, and possibly others, to get their input for a proposed standard format for time history files.

Multi-body dynamics - Ric Mousseau was absent and no one else had information about the status of this project.

Statistical analysis of data - Christoph Leser lead a discussion about statistical analysis of multi-pass data. The ATV data that was collected in the Fall of 1996 is available for anyone to analyze. It is located on a server at the University of Illinois (joe.me.uiuc.edu/pub/download) which can be logged onto as anonymous. Jason Roth will be documenting the details of this data in his thesis. Jason is looking for other multi-pass data that he could try his statistical analysis procedure on.

New Business:

The road load division will be involved in the load measurements of the ATV project. Dan Morrow has agreed to lead that effort. Dan has asked that individuals submit a list of channels that they believe should be measured on the ATV.

Minutes submitted by Ray Thompson