NVH Optimization of an In-Line 4-Cylinder Powertrain

Paper #:
  • 951294

Published:
  • 1995-05-01
Citation:
Querengässer, J., Meyer, J., Wolschendorf, J., and Nehl, J., "NVH Optimization of an In-Line 4-Cylinder Powertrain," SAE Technical Paper 951294, 1995, https://doi.org/10.4271/951294.
Pages:
8
Abstract:
The NVH optimization is a key issue for the development of future powertrains. This includes the radiated noise in terms of noise level and sound quality as well as the structure-borne noise excitation via the engine mounts. Experience shows that there are generally no single noise relevant components on modern powertrains which dominate the NVH behaviour. In contrast, a good NVH performance can only be achieved if the optimization process includes every single component and excitation. Only the combination of these optimized designs can lead to a first-class powertrain NVH.Within this paper the NVH optimization process of an existing 4-cylinder in-line spark-ignition powertrain is described. Examples for positive NVH designs are presented and their effect on the NVH behaviour are explained. Combining all positive NVH features into the engine resulted in a noise reduction of 3-5 dBA without any negative effect on fuel economy and performance.
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