Noise is one of the key nuisances from which the car is the source. One of those noise sources, the air induction line of the Internal Combustion Engine (ICE), can use some noise attenuation systems as damping isolated volumes (called resonators), or porous ducts, before the air filter. Those solutions can attenuate designated frequencies or range of frequencies. The issue is that those solutions can be bulky, especially for resonators, expensive or even generate some drawbacks on performances. Elements like hot air ingestion, pressure drops or even generation of new noises are some significant areas where performances can be deteriorated through the implementation of such acoustic device on the air induction line.
It has then invented and developed a brand new type of acoustic device, designed to ensure optimal performances for a very low packaging. This solution preserves performances and cost, and tend to cope with most of the drawbacks of usual technologies.
This paper describes and explains the design process, the evaluations methodology and results done to identify the optimum product.
Then, this optimized concept has been benchmarked versus conventional technologies, both on a test bench as well as on engine bench to assess its performances.
Results on intake noise attenuation, acoustic emissivity, pressure drops, temperature elevation and size has finally shown a best-in-class solution, able to overpass usual technologies on all those fields.
This leads to an essential solution, saving space and noise emissions, ideal to cope with latest Noise Emission Regulations and challenging packaging constraints.