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Kent Gee

@kentlgee.bsky.social
15 followers 16 following 16 posts

Professor and acoustician

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Kent Gee @kentlgee.bsky.social · 15/03/2026
We continue to expand our measurements and insights regarding rocket ascent sonic booms in this area.
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Kent Gee @kentlgee.bsky.social · 07/03/2025
Welcome! I've been here a few weeks. Fun fact: I grew up in Bay Village and was offered a track scholarship to CWRU.
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Kent Gee @kentlgee.bsky.social · 05/03/2025
While you're waiting for Flight 8, read about how Starship's launch noise compares to Falcon 9 and SLS at the close, close distance of 1 km! doi.org/10.1121/10.0...
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Kent Gee @kentlgee.bsky.social · 27/02/2025
If you're interested in learning about Starship's noise: Flight 5 launch noise and sonic boom overview: doi.org/10.1121/10.0... Flights 5 and 6 launch noise comparison: doi.org/10.1121/10.0... The Flight 5/6 comparison contains a noise prediction for a Starship launch from KSC.
doi.org
Starship super heavy acoustics: Far-field noise measurements during launch and the first-ever booster catch
Far-field (9.7–35.5 km) noise measurements were made during the fifth flight test of SpaceX's Starship Super Heavy, which included the first-ever booster catch.
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Reposted by Kent Gee
Kent Gee @kentlgee.bsky.social · 25/02/2025
As Starship is prepped for Flight 8, here's a launch noise analysis of Flights 5 and 6. Atmospheric winds make a big difference in far-field sound levels. (Figure quality in the online version is meh; download the free pdf instead!) doi.org/10.1121/10.0... @asa-news.bsky.social
doi.org
Starship Super Heavy acoustics: Comparing launch noise from Flights 5 and 6
This Letter analyzes launch noise from Starship Super Heavy's Flights 5 and 6. While Flight-5 data covered 9.7–35.5 km, the stations during Flight 6 spanned 1.0
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Kent Gee @kentlgee.bsky.social · 27/02/2025
After your other fans are done watching, I know a couple of articles about Starship's acoustics that they can read... 😁 Here's the latest: doi.org/10.1121/10.0... (The thumbnail shows sound speed in different directions - the much larger differences during Flight 6 led to more variability.)
doi.org
Starship Super Heavy acoustics: Comparing launch noise from Flights 5 and 6
This Letter analyzes launch noise from Starship Super Heavy's Flights 5 and 6. While Flight-5 data covered 9.7–35.5 km, the stations during Flight 6 spanned 1.0
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Kent Gee @kentlgee.bsky.social · 25/02/2025
As Starship is prepped for Flight 8, here's a launch noise analysis of Flights 5 and 6. Atmospheric winds make a big difference in far-field sound levels. (Figure quality in the online version is meh; download the free pdf instead!) doi.org/10.1121/10.0... @asa-news.bsky.social
doi.org
Starship Super Heavy acoustics: Comparing launch noise from Flights 5 and 6
This Letter analyzes launch noise from Starship Super Heavy's Flights 5 and 6. While Flight-5 data covered 9.7–35.5 km, the stations during Flight 6 spanned 1.0
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Kent Gee @kentlgee.bsky.social · 23/02/2025
And here's a paper that compares launch, flyback boom, and landing noise of the Falcon 9: doi.org/10.1121/2.00... @asa-news.bsky.social @nasaspaceflight.com
doi.org
Flyback sonic booms from Falcon-9 rockets: Measured data and some considerations for future models
The SpaceX Falcon-9 rocket is a partially-reusable vehicle with a first-stage booster that lands propulsively after launch. As the booster falls toward the land
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Kent Gee @kentlgee.bsky.social · 23/02/2025
A student and I studied the sound power produced by (still) the world's most powerful *orbital* rocket, NASA's Space Launch System. We then compared its 202+ dB to the Saturn V. Despite the Saturn V having lesser thrust, it produced greater sound power. #openaccess doi.org/10.1121/10.0...
doi.org
Sound power of NASA's lunar rockets: Space Launch System versus Saturn V
To improve acoustical models of super heavy-lift launch vehicles, this Letter reports Space Launch System's (SLS's) overall sound power level (OAPWL) and compar
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Kent Gee @kentlgee.bsky.social · 22/02/2025
An important early publication for me answered: "Do regular sound metrics account for 'crackle' in shock-containing noise?" The answer led to a search for better metrics for jet and rocket noise. The #openaccess letter includes multimedia: doi.org/10.1121/1.24... @asa-news.bsky.social
doi.org
On the potential limitations of conventional sound metrics in quantifying perception of nonlinearly propagated noise
The use of conventional metrics to quantify the perception of nonlinearly propagated noise has been studied. Gaussian noise waveforms have been numerically prop
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Kent Gee @kentlgee.bsky.social · 21/02/2025
This was the first paper I published in JASA, where we looked global active noise control of small axial fan. We figured out where to place microphones to cause large sound power reductions. doi.org/10.1121/1.16... Even led to a patent: patents.google.com/patent/US200...
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Reposted by Kent Gee
Mark Anderson @aerospacemark.bsky.social · 20/02/2025
Why does the Falcon-9 booster make a triple sonic boom? New research by myself and @kentlgee.bsky.social explains why this happens! Go check it out! Full Study: doi.org/10.1121/10.0... Scilight News Feature: doi.org/10.1063/10.0...
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Kent Gee @kentlgee.bsky.social · 13/02/2025
We have another paper coming out in the next week or two that builds on the first study!
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Kent Gee @kentlgee.bsky.social · 13/02/2025
Thanks for the post! One point of clarification. 10x the acoustic energy doesn't mean 10x loudness. Loudness, unfortunately, is a complicated measure that we didn't get into. But for someone keeping track of launch cadence and impact, it does look like at least 10 Falcon 9s launching, energy-wise.
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Kent Gee @kentlgee.bsky.social · 13/02/2025
I have an excellent track record for losing ASA elections. I think I'm 0/5 now! It's all good. I'm happy working with POMA and other technical initiatives.
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Kent Gee @kentlgee.bsky.social · 13/02/2025
One of our recent articles has to do with noise measurements of Starship Super Heavy: doi.org/10.1121/10.0... We talk about the launch noise and the flyback sonic boom. We have another study coming out soon that compares two flights' launch noise.
doi.org
Starship super heavy acoustics: Far-field noise measurements during launch and the first-ever booster catch
Far-field (9.7–35.5 km) noise measurements were made during the fifth flight test of SpaceX's Starship Super Heavy, which included the first-ever booster catch.
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Kent Gee @kentlgee.bsky.social · 13/02/2025
We got a paper published today that answers a not-quite-age-old question: Why does the Falcon-9 booster make a triple sonic boom during flyback? Give it a read! doi.org/10.1121/10.0... A news summary of the article is here: doi.org/10.1063/10.0...
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Kent Gee @kentlgee.bsky.social · 10/02/2025
Hello, world. Thought I'd give this a shot. I'll mostly share research updates & publications here. For starters, here's a list of my publications: physics.byu.edu/faculty/gee/... If you're interested in but can't download one, let me know. And here's a rocket launch pic. (DIVH, NROL-70).
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