Time-varying torsional stiffness identification on a vertical beam using Chebyshev polynomials
Chebyshev polynomials were used to identify the time-varying stiffness. Beam flexural modes had significant impact on torsional stiffness identification. Data was low-pass filtered to separate torsional and flexural modes of the beam.
chebyshev polynomials linear time-varying systems parameter identification dynamic systems experimental mechanical systems modal analysis