Alveocel micro-perforated foam
Dulcet Tones Despite Being a Diesel
For all the advances that have been made, diesel engines are still noisy. Nonetheless, owners of upper and luxury class models expect the passenger compartments to have as little vehicle noise as possible, even at high revs. Carmakers therefore place great value on efficient absorber systems. For a sports limousine fitted with a high-performance diesel engine, Röchling Automotive developed an additional absorber and then sought out a suitable material that would cover a broad frequency range. It found the solution at Sekisui Alveo AG, headquarters: Lucerne, Switzerland, a manufacturer of polyolefin foams: Alveocel micro-perforated foam offers exceptional acoustic efficiency. Used in flat absorbers composed of multiple layers of foam, Alveocel optimally reduces diesel engine noise, thereby providing the desired acoustic quality in the vehicle interior.
Alveocel meets all requirements imposed on the absorber material. Just one layer of the micro-perforated foam covers a broad frequency range through a combination of the Helmholtz resonance effect and dissipation. The absorption effect is enhanced by employing several foam layers. Nevertheless, the flat absorber takes up much less space than a box absorber. This was a crucial requirement, because the overall aerodynamic design of the vehicle and the tightly designed engine compartment required a flat solution. In addition, the rugged PP foam possesses permanent heat resistance of up to 130°C and, due to its closed cell structure, absorbs negligible amounts of moisture. All of which are excellent preconditions for applications near the engine, especially for spirited driving.
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