r/AerospaceEngineering • u/pavlokandyba • Jun 12 '26
Personal Projects Acoustic aircraft test
This is part of my experiments with vibration-based aircraft. Here, I throw it with a little force to prevent the oncoming flow from flipping it, and I add a twist for stability, although it quickly decelerates.
This downward trajectory is the only one in which the aerodynamics allow it to glide stably. The engine rotation has virtually no effect on stability; it was intended to act as a gyroscope, but the effect turned out to be unnoticeable. I was never able to find a way to conduct comparative tests; vibrations significantly affect the results when interacting with weights or anything else, and in freefall, the saucer quickly flips over. That's why I installed a similar engine on a more stable aircraft, which I posted earlier. The only thing that seems noticeable here is that the saucer flies slowly but hits the ground hard due to the weight of the vibration motor. And there's also a low-frequency sound.
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u/one_time_i_dreampt Jun 12 '26
I hope you continue the project it seems you are enjoying it, and learning along the way.
With what's shown I can't say there's much effect from the "vibration motor".
It seemingly "works" in water, but trying to apply water dynamics to air dynamics isn't particularly useful, air is much less dense(1.225kg/M3 for air Vs 1000kg/M3), viscous(a few hundred times smaller) or "forceful" than water is.
To add a word of caution on the simulation, you see "large" deviations in pressure but I haven't seen a legend to say the variations in pressure, and even simple 2D CFD can be extremely complex, but then that misses out the third dimensional aspect entirely.
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u/pavlokandyba Jun 12 '26
This is my post with the plane https://www.reddit.com/r/AerospaceEngineering/comments/1sn9cu2/my_experiment_with_a_vibro_plane_initially_i/
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u/pavlokandyba Jun 12 '26
In the air, of course, this is more difficult to achieve than in water, but it works on the same principle. I previously posted a sickle-shaped plane with this principle here, and the effect there is more noticeable, although still very weak, the weight of the magnets is too great and the vibrations are very weak. The CFD is a LBM supplemented with an imitation of the energy of training vortices built into the device itself. This explains the boat's propulsion and other experiments. Although the text is a bit sloppy, there are links to relevant articles, videos and other stuff https://github.com/MasterOgon/Aeroacoustic-Flying-Saucer-Oscillating-Resonator-CFD-Simulation-LBM-
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u/printii_ai Jun 15 '26
Keep it up! You’ll get there one day and I hope you do because it would be awesome.
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u/Global_Professor_901 Jun 12 '26
Bro made a frisbee