Stabilised Layer Method for linear and nonlinear spatial non classical damping identification

In the Layer Method the damping matrix is written as a sum of several layers characterised by a semidefinite positive elementary matrix. Each layer is modulated by an unknown damping coefficient and finally expanded to the system total dimensions, using a localisation matrix based on the system topology. The linear and nonlinear spatial damping distribution most close to the real dissipations can be identified directly from experimental FRFs combining the Stabilised Layer Method approach with the inverse receptance method. In this paper the Stabilised Layer Method is experimentally applied to a simple nonclassically viscous damping system and to a quite complex industrial example as a body in white chassis. Finally a nonlinear system with a localised magnetic eddy-current damping is numerically investigated. The nonlinear damping coefficients are identified from numerical nonlinear frequency response functions with additional random noise.