In this work, a PC-based FEM software is developed for modeling and dynamic analysis of rotor-bearing systems with rotational speed dependent parameters. The developed program is capable of calculating and displaying damped critical speeds, mode shapes, whirl speed charts and, in particular, asynchronous responses of flexible rotors supported in journal bearings as well as rolling element bearings. The main features of the program are the adoption of a powerful scheme in the calculation of asynchronous responses, which utilizes the concept of lambda-matrix, the flexibility in modeling due to the use of FEM technique, and the capability of systematic handling of rotational speed dependent parameters such as gyroscopic moments and bearing coefficients.
The program is designed to be user-friendly. Users can analyzed the dynamic characteristics of rotor-bearing systems and can also examine the effect of changes in existing designs. It consists of four modules: user interface, the input/edit, dynamic analysis and numeric output modules, which are all menu driven. Error handling routines with messages are also included for debugging.
Six illustrative examples are carefully sellected in order to demonstrate the power and the features of the developed program.
