Frequency-domain subspace identification for nonlinear mechanical systems
A new method for the identification of nonlinear mechanical systems is introduced. This subspace-based method exploits frequency-domain data. Nonlinearities are seen as feedback forces exciting the underlying linear system. The technique is first demonstrated using two academic examples. The experimental identification of a nonlinear beam is then addressed.
nonlinear system identification subspace method frequency domain characterisation criterion numerical and experimental data