Downsizing and downspeeding are important concepts for automotive combustion engines to further decrease fuel consumption. These engine technologies will play an important role in future efforts of the automotive industry to provide sustainable mobility and advance preservation of the environment and natural resources. However, these technologies are a major challenge with respect to the NVH performance of vehicles due to the increase in torsional irregularity, as well as, an increase of the low frequency excitation in the gas dynamics of induction and exhaust. Eventually, this could result in a lack of customer's acceptance and is therefore an important stepping stone for the broad introduction of it. On the other hand, a distinguished sound design has proven to be an essential messenger for core attributes of a brand such as expressive sportiness, cultivated power, robustness, and trustworthy safety. Superb sound quality certainly contributes to the creation of positive feelings like driving pleasure which turns a simple machine for moving people between places into a desirable object. In this context, active sound design could become an important enabler of fuel reduction technologies. But even though this technology creates virtually unlimited design space, there are indisputably guidelines based on customer's expectations and targeted vehicle images. In two studies, the potential of active exhaust silencers was investigated and compared to conventional muffler systems. For a typical downsized gasoline engine with 4 cylinders, turbocharged, and with direct injection, it could be confirmed that weight and muffler volume can be decreased with similar or even better results in backpressure and acoustics. In a second case, the motivation and results of the exhaust system development of a 6 cylinder diesel engine with dual turbocharger was reported. Here, the engine power and performance nearly competes that of conventional V8 gasoline engines without compromising on the fuel economy. To overcome the acoustic shortcomings inevitably associated with the engine concept, active sound design proved to be a powerful and efficient method. From the first automotive series production which started in 2011, valuable information could be gathered which will support further optimization of the ActiveSilence technology. At this point, all necessary components such as actuators, sensor, software, and electronic hardware are in the last pre-development phase and will be provided to the market after the entire completion of the durability validation.


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    Title :

    Active exhaust silencers - from noise reduction to sound design


    Contributors:


    Publication date :

    2013


    Size :

    15 Seiten, 10 Bilder, 1 Tabelle, 12 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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