`I_n = 1731 ( "n" ^2-1) { S(1 +B/8)+3B/(1+B)[| "a" / "L" -sqrt(S)|^3 + | "b" / "L" - sqrt(S)|^3]}`

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This Inharmonicity equation computes the degree to which the frequencies of overtones (also known as partials or partial tones) depart from whole multiples of the fundamental frequency (harmonic series).

NOTES

Acoustic factor in the unit of cents.

Note, stiffness (S) `= d^4/(139439 L^2 T)`.

Also note, that `B = A( D^2/b^2 -1)`, where A is a function of the wire wrapping material (copper,iron,aluminum,none).

REFERENCE

[1] inharmonicity
Source:   Wikipedia
URL: https://en.wikipedia.org/wiki/Inharmonicity
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