Add cubic and quadratic nonlinearities #18
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Add a function for an nonlinear stiffness matrix which uses an analytic quadratic differentiation and a function for a calculating it numerically. Add an example to use quadratic nonlinearities.
…cond-order-nonlin
Add Nonlinearity class to handle different nonlinear types. Update nonlinear example script. Remove stationary nonlinear simulation.
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Add functionality for possible custom/rayleigh cubic/quadratic nonlinearities. Right now only the quadratic and cubic rayleigh-type nonlinearities are fully implemented.
Add WIP example code for FEM Harmonic Balancing.
Add example script for running nonlinear simulations.