According tomedia reports, vehicle vibration noise has been a problem for automotive engineers for decades, and its combination of sound and sensation generated by traditional automotive systems, as well as road noise and environmental noise, such as urban noise, makes it difficult to eliminate it. In the field of electric vehicles, this problem is even more difficult to solve because the noise base of cars is much lower.
A “noise substrate” is the sum of all unwanted sounds that must be overcome when measuring a particular sound. For example, when you want to chat with a friend at a rock concert, but your friend can’t hear you, because the music and the voices of other people together raise the noise base in the room.
Since electric vehicles’ powertrains will be largely noise-free, Nissan engineers seem to have found a good way to cover up noise from other sources, such as roads.
On Tuesday, Nissan unveiled its latest acoustic super-bright material at CES in Las Vegas. This material differs from conventional soundproofing in that it uses two layers of lightweight plastic, and between them a honeycomb-shaped oblique structure. This structure mainly uses air to capture relatively low frequency vibrations (500Hz to 1200 hz), and road noise is within this range.
Acoustic super-intelligent materials are particularly interesting in the field of electric vehicles because they are designed to reduce weight. Nissan estimates that the material weighs about a quarter of the weight of conventional materials, and that the lighter the performance, while increasing the range of the car.
Although Nissan only showed the acoustic super-bright material on its Ariya concept car this year, the company has been developing it since 2008. Initially, however, the technology was used as part of a highly sensitive antenna that measured electromagnetic waves.