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In the future, the requirements of acoustic behavior in air intake systems will continue to increase. Active systems will be necessary to reach the higher legislative standards and customer expectations regarding noise levels. The optimization of the Active Noise Control System regarding the sound design in the interior is based on the transfer function between the engine and the passenger compartment as well as the design of the air intake system. This paper shows the development process, with a focus on the investigation of transfer functions in passenger cars and the computational calculation for the system configuration.

In the future plastic will require an improvement as a material for air intake manifolds due to the advantages in cost and weight compared with metal. New engines observe the future legislative limits of noise emissions, it will be necessary to improve the acoustic behavior of plastic air intake manifolds. An investigation evaluated alternative and common manufacturing methods. Extensive investigations of different plastic and non-plastic materials have been the foundation of a material database. In the following step FEM/BEM calculations with a model of a simplified inatke manifold have been done to determine design optimizations.