Air Intake System Optimization for Acoustic Advantage on Automotive Vehicles 2010-01-1985
Recently quietness has become an important quality parameter for automotive vehicles and as a result various improvements have been brought to reduce noise at system and vehicle level. Due to stringent noise emission norms on automotive vehicles and increasing desire of quieter in-cab performance by users, reduction of air intake noise tends to be an area of explanation. Air intake noise, which was relatively considered as a minor source of noise in the past, is now gaining importance.
To reduce air intake noise basically resonator and expansion chamber are used on automotive vehicles. Resonators are widely used for noise reduction of intake and exhaust systems, but due to increased number of components, its associated cost; complexity of the system increases. The next option that is an expansion chamber prevents the formation of large amplitude standing waves and dissipates sound energy, however use of such a device reduces engine torque at narrow range of engine speeds.
The objective of the paper is to propose a simple in construction, effective silencing device, which can achieve good results in minimizing the noise produced by air charge (drawn into the AIS) without drastically deviating the power ratings of engine. Air intake muffler (proposed) is used as noise reduction device in place of an intake pipe on the suction side of AIS. The proposed concept is able to submit an optimized design package on the vehicle and virtual simulations show significant improvement in the flow patterns of air charge that will enable good acoustic behavior by AIS. The project is considered for validation plan on real time vehicle application to realize the objective of the design as future scope of work.