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The paper describes a theoretical and experimental approach to solve vibration and noise problems in the powertrain with vibration control products on an elastomer basis. Crankshaft dampers can reduce the torsional, and - if properly tuned and designed - also the bending vibrations. The paper compares the crankshaft vibrations for different damper designs which shows the potential for further vibration and noise reductions. Shafts in the drivetrain are excited to torsional and bending vibrations by the inertia and gas forces of the engine, cardan joints and gear mesh. For the following two problems vibrations and noise are investigated: 1. A torsional resonance of a driveshaft 2. A bending resonance of a halfshaft Measurements show that noise and vibrations from the drivetrain can also be reduced significantly with tuned elastomer dampers.

The paper describes a theoretical and experimental approach to solve vibration and noise problems in the powertrain with vibration control products on an elastomer basis. Crankshaft dampers can reduce the torsional, and - if properly tuned and designed - also the bending vibrations. The paper compares the crankshaft vibrations for different damper designs which shows the potential for further vibration and noise reductions. Shafts in the drivetrain are excited to torsional and bending vibrations by the inertia and gas forces of the engine, cardan joints and gear mesh. For the following two problems vibrations and noise are investigated: 1 A torsional resonance of a driveshaft 2 A bending resonance of a halfshaft Measurements show that noise and vibrations from the drivetrain can also be reduced significantly with tuned elastomer dampers.

The ability to utilize existing infrastructure i.e. tools, equipment and machinery to generate a unique acoustic product offering with minimal changes is important. This is because no generic acoustic solution ( material or composite ) exists for different vehicle configurations. Also, recent developments in predictive acoustic engineering and enhanced CAE capabilities as applied to development of optimal flat sample criteria for in-vehicle transmission loss and absorption performance allow for reverse engineering of the noise control systems. This reverse engineering coupled with a flexible manufacturing system will allow customization or tuning for any given program. Cost effective acoustic systems that can provide optimal insertion loss/absorption ratios utilizing a common manufacturing process will be the enabler to sustain competitive advantage.