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1. Previous Minutes:Minutes from the last meeting were accepted and are posted on the FD&E web site.2. Rainflow Standard File Format:The proposed standard J1795 has been sent out for re-ballot.Ric Mousseau presented an update on some of the current issues being addressed by the multibody dynamics modeling project. A model of the test stand is done and test stand modifications identified. Ric is currently working on reduced stiffness bushings. Testing is ready to start. 3. Presentations:Ric Mousseau spoke on "Modeling of Elastomeric Components for Force Prediction." Ric discussed the modeling requirements for static and dynamic responses. The influence of carbon black on damping and stiffness was discussed along with "Mullins effects" and loss factor testing. Several models used to represent bushings were presented and Ric showed some predicted versus test data using Morman’s model. Kevin Park presented a summary of statistical load measurements on a Honda 300 Four Trax ATV being performed at the University of Illinois. The ATV has been instrumented to measure upper and lower ball joint loads, suspension deflections, steering angle, vehicle speed and two strain gauged shock brackets. A baseline Cumulative Exceedance Diagram (CED) was generated from proving ground data on an automobile. Five track modules have been developed to represent different types of loading, such as curb, ripples, pot holes, etc. The CED from combinations of the track modules is compared to the baseline to try and produce a "typical" automotive history. For more information see Kevin Park or send e-mail to
k-park(at)coewl.cen.uiuc.edu. Minutes for 9 October 1996 SAE-RLDA Division Planning MeetingIn attendance: D. Morrow, R. Thompson, R. Mousseau. S. Downing, Z. Bai, A. Page, D. Socie, G. Marquis, C. Payne, M. Messman, A. Conle The following topics were discussed at the planning session.
1. Rainflow Data Format:It was mentioned that the rainflow data format was sent out to be re-balloted. 2. Time History Data File Formats:A discussion of existing generic file formats followed. A brief discussion of the ERD and NCSA data formats followed, and it was decided to wait for Charlie to report on the NCSA format during the next meeting before going into more detail on these. 3. Multibody Dynamics:Ric presented more details on the multibody dynamics modeling project. Steve Haeg is still instrumenting the control arms to measure loads at the reaction points, bushings and ball joints. Ric is in the process of getting bushing data. 4. Statistics in Road Load Data:Art presented more information on the data (of 12 channels and 7 passes of about 40 minutes for each pass) he presented at the last meeting. Art had performed some analysis on pass to pass comparisons and presented plots where the first pass was normalized to a life of 700 passes through Kf and the rest of the passes were compared to each other using the same Kf. Again, Art pointed out that the channels near the road, such as spindle acceleration and displacement, may have little pass to pass variability, but as you move away from the road inputs, the pass to pass variability increases. Darrell Socie led discussions on other ways to characterize the data using spectrum information (distribution shapes) to avoid being misled by unusual large occurrences in the baseline run. No new business was brought up and the meeting was adjourned.
AGENDASAE Fatigue Design and Evaluation Committee
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