When the sound of the engine isn't dominating, you start to hear a lot of little rumbles and hums you never noticed before, and that's the engineering challenge.
It's not just about making things quiet; it's about making them the right kind of quiet. "You have to balance wind, road, and powertrain noise," Bohn continues. "Those are the three fundamental tones the driver hears in the car, and the absence of any one of them is a little disconcerting."For example, drivers expect to hear something when mashing the accelerator, even in an EV.
Bohn continues, "The problems in EVs start to show up around 500 to 600 hertz," the frequency at which many EV components, such as gears and motors, resonate. Since engineers can't cancel that sound, they have to dissipate it or tune it to be pleasant.Electric vehicles are heavy, but that doesn't mean they're fat. To save weight, engineers have shifted away from additional sound deadening to dampen vibrations.
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