3 ms·

Unsurprisingly the paper is more interesting: https://pubs.aip.org/asa/jel/article/4/11/113601/3320807/Starship-super-heavy-acoustics-Far-field-noise https://pu

Unsurprisingly the paper is more interesting: https://pubs.aip.org/asa/jel/article/4/11/113601/3320807/Starship-super-heavy-acoustics-Far-field-noise https://pubs.aip.org/asa/jel/article/4/11/113601/3320807/Sta... “Notably, a supersonic Concorde flying at an altitude of 18 km produced a sonic boom with a PL of ∼105 dB at the ground. With a difference of 5 dB, one approximation for a Starship flyback boom at 20 km is a ∼50% increase in loudness over the Concorde boom (where 9 dB represents a loudness doubling; see Stevens, 1972).”

delichon 2y ago
I thought it was logarithmic and it doubled for each 10 db. Why 9 db? Lots of confusion online about this but 9 db isn't one of the values mentioned much. This piece says sound pressure doubles each 6 db: https://sengpielaudio.com/calculator-levelchange.htm https://sengpielaudio.com/calculator-levelchange.htm
- Bjartr 2y ago
  The paper they reference[1] is a paper that describes an approach to formalize human perception of loudness. This is distinct from the sound pressure due to the construction of the human auditory system. Here's the relevant excerpt, but you'd have to read the paper to see why they claim this as accurate. > The perceived magnitude (loudness or noisiness) grows as the 2/3 power of the sound pressure, so that perceived magnitude doubles with each increase of 9 dB. [1] Stevens, S. S. (1972). “ Perceived level of noise by Mark VII and decibels (E),” J. Acoust. Soc. Am. 51(2B), 575–601.https://doi.org/10.1121/1.1912880 https://doi.org/10.1121/1.1912880 Available in full from sci-hub