Modeling and Correlation of the Human Bodyís Filters/Response to Acceleration During Vehicle Shifting and Transfer to the Laboratory Environment, 03-R9576Printer Friendly Version
Inclusive Dates: 09/01/05 12/28/05
Background - Determining the quality of automatic transmission shifting has historically been performed by human calibrations and in-vehicle applications. This methodology has always been affected by road conditions and inconsistencies in driverís subjective ratings. There has been a need for a more objective rating system that would mimic human assessment through mathematical computations. This system would eventually allow engineers to perform shift quality in a more controlled laboratory environment.
Approach - The main objective of the project was to develop a process that would allow SwRI engineers to quickly instrument a vehicle with accelerometers and acquire vibration data used to assess the quality of the shift needed for the development and correlation of laboratory tools.
Accomplishments - A special laptop-based system was built to interface accelerometers and acquire data during shifting. Additionally, the system included a graphical user interface that allowed the driver to subjectively rate the shift and subsequently execute a series of analytical filtering routines that were post-processed. A series of vehicle acceleration runs were performed, and the code was applied to objectively characterize individual shifts. These data have become part of a database that will be used to develop future laboratory-based transmission shift assessment.