An Effective Method for the Identification of Support Features in Multi-supported Systems

摘要

The mechanical properties of supports in a mechanical system strongly affect its dynamic behavior under real operating conditions. This work presents a new method for identifying the dynamical characteristics of local supports which has been developed along the lines of the work by Ozguven (Mech Syst Signal Process 4:53-63, 1990) and Debut et al. (Proceeding of the 19th international congress on sound and vibration, Vilnius, Lithuania, 2012), which combines measured frequency transfer functions and techniques from structural modifications. As typical for inverse problem, the noise in the frequency transfer functions lead to faulty identifications, so that regularization techniques have been implemented to mitigate noise amplification in the inverse problem. The proposed approach has been then numerically tested on a multi-supported structure, which can be seen as an idealized electricity generator rotor shaft. The results are satisfactory for noise-free data as well as under realistic noise levels.