Spatial Truncation in Models of Non-Linear Vibrating Systems

A Frequency Domain Method for Estimating the Parameters of a Non-Linear Structural Dynamic Model Through Feedback

“…In particular, the correct dofs must be used to compute the non-linear functions (X LG ( )), which account for the internal feedback forces. Otherwise, a kind of &spatial truncation' can signi"cantly a!ect the parameter estimates [14]. In other words, if the system is not well characterised, the parameter estimation problem is not well-posed because the NIFO formulation involves a correlated source of noise, which produces biased parameter estimates.…”