https://github.com/garrrikkotua/bachelor_diploma

Computation of the noise intensity spectrum induced by turbulent boundary layer on the surface of subsonic passenger aircraft using eigen frequencies approach.
https://github.com/garrrikkotua/bachelor_diploma

aeroacoustics aerodynamics jupyter-notebook monte-carlo-integration python vegas

Last synced: about 1 month ago
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Computation of the noise intensity spectrum induced by turbulent boundary layer on the surface of subsonic passenger aircraft using eigen frequencies approach.

• Host: GitHub
• URL: https://github.com/garrrikkotua/bachelor_diploma
• Owner: garrrikkotua
• Created: 2021-02-07T17:53:01.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2021-08-31T09:41:35.000Z (about 3 years ago)
• Last Synced: 2024-01-28T02:09:23.666Z (10 months ago)
• Topics: aeroacoustics, aerodynamics, jupyter-notebook, monte-carlo-integration, python, vegas
• Language: Jupyter Notebook
• Homepage:
• Size: 9.97 MB
• Stars: 0
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# diploma

 Jupyter Notebooks for my Bachelor Thesis @ MIPT 


My bachelor thesis is devoted to the computation of the noise spectrum induced by turbulent boundary layer on the fuselage of subsonic passenger aircraft.

Broadly, calculations involve four main steps:



  
Finding eigen modes of shell vibration

  
Computing displacement spectrum using Efimtsov model and numerical integration

  
Obtaining displacement spectrum in the frequency domain through Fast Fourier Transform

  
Calculating noise intensity spectrum using Vegas implementation of the Monte Carlo algorithm



 Perfomance Details 


All cimputations are done in the tensor fashion (because they are quite heavy) and implemented via Numpy arrays. One can simply use Numba to speed up computations (GPU version of Numpy),

however the last part with Vegas integration requires converting Numba tensors back to Numpy. Unfortunately, it kills all the perfomance. That's why caching is used as a complexity-perfomance trade-off.

Visualization of eigen modes


Some exmaples of natural vibrations of the cylindricall shell (small part of its surface).

![Alt Text](3mode.gif)

![Alt Text](3x4mode.gif)