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A system which can remotely measure detailed deformations of vehicle structures during crush events was developed. The system uses ordinary video or 16 mm high speed movie to capture the crush event. This information is digitized and analyzed using personal computers to perform photogrammetric manipulations which yield accurate surface geometries. The output is useful for comparison to computer simulations. This paper presents preliminary results regarding the accuracy of this system.

TORSIONAL VIBRATION, which is always present in an automotive driveline, appears to be the major source of gear rattle. BORG-WARNER AUTOMOTIVE's approach to solving gear rattle problems is based on a systems approach. By utilizing linear and nonlinear models of the vehicle powertrain, trial design changes can be evaluated for the effect on gear rattle. By viewing the powertrain as a system, all critical areas that affect gear rattle are identified and can then be optimized before finalizing the production design. This paper presents the current status of active analytical and experimental studies of driveline noise and vibration with particular emphasis on how system component inertias, spring rates, and damping effect drive, coast, and neutral gear rattle.