I am looking for the polynomial coefficient's analytical form of 2nd and/or higher-order (ex: b0, b1, b2 ...in the force factor and k0, k1 k2... in stiffness).

Most of the available works of literature show only the measured data of the coefficients of nonlinearities like force factor and stiffness.

I am currently working on estimating Total Harmonic Distortion (THD) in an electromagnetic microspeaker and trying to check which nonlinearity has a high impact on its performance.

Is there any analytical method to estimate (not measure) the coefficients?

Any leads in this direction will be helpful.

Thanks in advance.

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