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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, the requirements of acoustic behavior in air intake systems will continue to increase. Common passive or adaptive acoustic measures will not be able to reach higher standards while maintaining reasonable costs and packaging specifications. For new engines complying with future legislative limits in noise emissions, it will be necessary to develop active systems. This investigation analyzes the possibility of integrating an active noise cancellation system within the air intake system. An air intake system was optimized by one dimensional calculation. The components of the active system were defined according to the computational results. The acoustical feasibility of an active system were then measured and analyzed on an anechoic engine dynamometer.

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.