Abstract: A new approach based upon the finite element method is put forth to improve the currently used transfer matrix method. With the approach, the variation of section parameters and the continuity of mass in elements can be allowded for when using the transfer matrix method in analysing a rotor-bases system, thus more precise results of analysis will be gained without need of increasing much CPU time. Several useful conclusions supported by a few of detailed examples are also obtained.

Key words: rotor, dynamic analysis, transfer matrix method, vi-bration