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I have found it surprisingly easy to find information on jet engines; however, I've been unable to find acoustic information so I can make a noise spectrum model. I'm looking for oscillations from 100Hz up to 1MHz. I could make some guesses based on the number of blades, diameter and rotation speed, but I believe this information is out there because there exists noise reduction insulation on aircraft, and environmental noise rules. In my search, I've found that NASA as analysis tools for acoustic liners, but nowhere have I found a study where these frequencies are described (I realize they will be different for different engines)

Ideally, what I'm trying to find is a decibel vs. frequency chart.

My motivation is purely academic as I have found (I think) that certain capacitors inject noise via ultrasonic oscillation into electronics, and I'm trying to find the frequencies involved. (I'm pretty sure that I'm going to have to make a blade/stage/rpm/thrust model for the noise, but I'm really hoping that the acoustic information is out there.) At this point, it's possibly down to nomenclature and that I am not looking for the correct term as aviation is full of lingo.

Has anyone ever seen acoustic data for a jet engine anywhere?

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    $\begingroup$ Have you looked at fly-over spectrograms? These are available in scientific literature, but of course they include the complete aircraft. Is that maybe what you're looking for? Otherwise there are some very simple models to model the noise of the engine based on some parameters. $\endgroup$ – Daniel Dec 28 '18 at 23:56
  • $\begingroup$ @Daniel No, but I'll take a look for those. The complete aircraft would be fine, and I'm just hoping to get a general feel for concentrations of noise energy. I'll dig in the library. $\endgroup$ – b degnan Dec 29 '18 at 1:32

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