Calculating sound absorption in air, water and various other materials. It requires gcc (tested with 5.4), GNU Make (tested with 4.1), ROOT (tested with 6.15), the latter also including the Minuit2 component (for the fitting).
This project is based on sound absorption formulas. For the case of air, it is based on:
- ANSI Standard S1-26:1995 (ISO 9613-1:1996)
- H.E. Bass et al J.Acoust.Soc.Am., 97(1), 680 (1995) For water, it is based on:
- Francois & Garrison, J.Acoust.Soc.Am., 72(3), 896 and J.Acoust.Soc.Am., 72(6), 1879, both 1982.
- Fisher & Simmons, J.Acoust.Soc.Am., 62, 558, 1977.
- Ainslie & McColm, J.Acoust.Soc.Am., 103(3), 1671, 1998.
For other, construction related materials, it is based on measurements of a Kiev-based company Acoustic Trafic.
It consists of codes of two kind:
- fitting the original formulas with a simplified version and determining the parameters
- using the simple formulas
- README.md: This README file
- Makefile: Using
make <basename>.exe, it will create an executable from any<basename>.cc - base_formulas_original.h: This contains all basic formulas from the original papers
- air_absorption_4component_fitter.cc: Fitting the original air absorption formulas with a simplified, piecewise formula, with 4 components
- air_absorption_5component_fitter.cc: Fitting the original air absorption formulas with a simplified, piecewise formula, with 5 components
- water_absorption_general.cc: Fitting the original water absorption formulas with a simplified, piecewise formula, with 3 components
- water_air_simpifield_formula.h: Calculation of the piecewise simple formula for water and air
- other_materials_ai.h: Calculation of the piecewise simple formula for other (construction-related) materials
- plot_simple_example.cc: Creating example plots using the simplified formulas
- air_approximation_T20_H30_P1.png: Example plot for air, created via
plot_simple_example.exe, solid green line is the original formula, dashed red is the approximation - water_approximation_T8_S35_D500_pH8.png: Example plot for water, created via
plot_simple_example.exe, solid green line is the original formula, dashed red is the approximation - othermat_approximation_nmat5.png: Example plot for a construction material, created via
plot_simple_example.exe, black circles are the original data points, dashed red is the approximation - plot_simple_example_noroot.cc: Printing out (via
stdout) original and simpified results for air, water and a constricution material as example, without ROOT; can then be plotted with one's favourite plotter (Gnuplot, Python, etc) - plot_simple_example_noroot.out: Example output created via
plot_simple_example_noroot.exe - nonroot_calculations_plotted.xlsx: Excel visualization of the output plot_simple_example_noroot.out
- absorption_project.ipynb: Python calculations of water and air absorption as a Jupyter notebook
- absorption_project.py: Python executable script version of absorption_project.ipynb
- other_materials_ai.txt: Other material absorption data to be imported in absorption_project.ipynb
- other_materials_names.txt: Other material names to be imported in absorption_project.ipynb
