3 ms·
Unsurprising to me. Good engineering includes efficiency, i.e. little energy wasted to acoustical output.
by ironmagma 4y ago
Unsurprising to me. Good engineering includes efficiency, i.e. little energy wasted to acoustical output.
- semi-extrinsic 4y agoNo, that's incorrect. Low noise from a car means using several well designed mufflers on the exhaust (and ribs etc. on the air intake as well), which increase the flow resistance and decrease the power output slightly. And if you think about it, 1 horsepower is 750 watts. A 750 watt speaker system at full volume is extremely loud, but 1 horsepower is way smaller than the statistical standard deviation in engine output.
- TylerE 4y agoAlso, turbos. Lots of sound reduction there. Some economy cars don't even have mufflers anymore - the turbo is enough.
- ironmagma 4y agoThat’s one way low noise can be achieved. Another is by being more efficient like with electric cars.
- semi-extrinsic 4y agoNo, that's a complete non sequitur. Efficiency and noise production are not directly related, and can frequently be anti-correlated. Just to take an example, the single-speed helical gearboxes used e.g. by Tesla are a prime example of sacrificing efficiency in an EV just to reduce noise. Using a straight-cut transmission like they do e.g. in Formula E would be more efficient, more lightweight at the same torque rating, and a lot more noisy.