Browse Publications Technical Papers 2019-01-1502
2019-06-05

Reducing vehicle interior NVH by means of locally resonant metamaterial patches on a rear shock tower 2019-01-1502

Stringent regulations for CO2 emissions and noise pollution reduction demand lighter and improved NVH solutions in automotive industries. Designing light, compact and, at the same time, improved NVH solutions is often a challenge, as low noise and vibration levels often require heavy and bulky additions, especially to be effective in the low frequency regime. Recently, locally resonant metamaterials have emerged among the novel NVH solutions because of their performant NVH properties combined with lightweight and compact design. Thanks to stop band behavior, metamaterials beat the mass law, be it at least in some tunable frequency ranges. Previously the authors demonstrated how metamaterials can reduce the vibrations in a simplified shock tower upon shaker excitation. In this work, the authors apply the metamaterial concept on a real shock tower of a vehicle. As benchmark, a vehicle is chosen which has a 1.46 kg weight addition in the form of a lumped tuned vibration absorbers on each of the rear shock towers as NVH solution. It is shown that the metamaterial solution allows to achieve similar interior NVH performance, while reducing the added mass with 40%. The metamaterial additions are realized through 3D printing and are designed to be effective around 200Hz, as was the case for the original solution. Both experimental results and numerical validation of a road test will be presented.

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