Browse Publications Technical Papers 2010-01-1419
2010-06-09

Influence of Low-Frequency Powertrain-Vibrations on Driveability-Assessments 2010-01-1419

Cost- and time-efficient vehicle development is increasingly depending on the usage of adequate software tools to enhance effectiveness. The aim is a continuous integration of simulation tools and test environments within the vehicle development process in order to save time and costs.
This paper introduces a procedure to reveal the cause of low-frequency powertrain vibrations and the influences on the dynamic behavior of a vehicle on a roller test bench. The affected longitudinal acceleration signal is an arbitrative criterion for the driveability assessment with AVL-DRIVE™, a well-known driveability analysis and development tool for the objective assessment concerning NVH and driveability aspects of full vehicles. These experimental studies are embedded into an approach, which describes the functional assembly of three applied test environments "road," "roller test bench" and "simulation" with according tools in order to facilitate an integrated driveability development process.
The low powertrain vibrations are identified by performance of positive load-change maneuvers (Tip-In) in the vehicle on a roller test bench. A parallel recording of acceleration signals by the driveability analysis sensor system and of defined surfaces by a 3D Laser-Scanning Vibrometer (LSV) allows an identification of possible vibration causes by analysis of the appearing frequency spectrum.
Furthermore is elucidated, how the influences of different tires at the vehicle affect its longitudinal dynamic behavior. Hence the rim surface is scanned with a 3D Laser-Scanning Vibrometer focusing its longitudinal acceleration stimulation in the range of 1 - 100 Hz. The gained knowledge from these investigations helps to determine room for improvement of vehicle driveability and NVH behavior but as well for advancement of simulation models.

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