4 ms·
That's really neat - it sounds like a violin. I can barely keep a tune so I'm wondering if anyone knows anything special about the melody
by asciii 2y ago
That's really neat - it sounds like a violin. I can barely keep a tune so I'm wondering if anyone knows anything special about the melody
- gorlilla 2y agoThey sound just like stepper motors to me. Especially when they're operating to create a radius/arc in a 2-D plane.
- bmicraft 2y agoWell, those VVVF frequency converters were specifically tuned to have their "steps" on full notes/chords. It doesn't sound like that by accident.
- rob74 2y agoDetailed explanation (in German) here: https://de.wikipedia.org/wiki/Siemens_ES64U2#Ger%C3%A4uschentwicklung https://de.wikipedia.org/wiki/Siemens_ES64U2#Ger%C3%A4uschen... > Google translation: When switching on from a standing start, a noise can be heard that is reminiscent of playing through a scale on a tenor saxophone. It is created in the three-phase motors by controlling the power converters. The noise is twice the clock frequency of the pulse inverters, which is gradually increased. The frequency changes in whole and semitone steps over two octaves from d to d" in the tone pool of the root tones. It is a Dorian scale on the root D. Theoretically, it would be possible to program the locomotive in such a way that it emits completely different sounds. However, the manufacturer has opted for a scale because these sounds are perceived as pleasant by the human ear. This makes it possible for a four-voice tone to result when the wheelsets are spinning (for example due to wet rails). No wonder the Austrians (who have a reputation of being music lovers) have most of these engines...