Passenger Car Tyre Noise Improvement by Body Panel Damping using Resonant Structural Metamaterials
摘要
The recent race to electrification of passenger cars has changed the balance of noise sources inside the vehicle cabin, giving even higher importance – especially at low speeds, where the aerodynamic noise is low – to the tyre rolling noise (also called “road noise”). Tyre noise acts across a wide range of frequencies. Due to its prominent tonality, the noise associated with tyre cavity resonances – which usually acts in the range of 200 Hz due to the geometrical characteristics of the tyre – is probably the most annoying in customer’s perspective. Concurrently, due to the importance of fuel economy and the increased cost of raw materials, there is a strong need for lightweight, high performance NVH solutions that provide an improvement compared to the “classical” damping materials or an alternative to structural modifications that might be hard to implement due to the trade-off with other performances, increased mass, and cost. In this paper, a distribution of 3D printed resonant elements is used to dampen the vibration of a vehicle body panel that radiates tyre noise inside the cabin. Experiments are conducted on a full vehicle showing high potential for vibration reduction in the tuned “stopband” which is matched by an improvement in interior noise.