The noise and the sound of passenger cars has been dominated by the acoustic characteristics of the combustion engine for a long time. But now there is a change: Over the years acoustic engineers have reduced the sound level of the combustion engines in exterior noise as well as in interior noise. So other noise sources, like accessories and servomotors became noticeable and annoying. Today electrical devices are getting more powerful not only attending but also substituting the combustion engine like the e-motors of hybrid powertrains. But not only the electric powertrains are getting more and more relevant for the acoustics of passenger cars. Missing the covering sound and the mechanical power of the combustion engine in several operating conditions of the car, more and more electric powered units for power steering, brake booster, air conditioning, etc. are getting relevant for the sound. In the end, there is no combustion engine anymore like in fuel cell powertrains and the acoustics of these cars is totally different from the cars we use today. The challenges are numerous and complex: What kind of sound is expected from tomorrows cars and which kind of sound is possible using acoustic measures?
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