Software: BrgLibrary (Bearing Calculation) & BrgRotor (Bearing-Rotor Simulation)
(1) BrgLibrary can be a stand alone computer program or used as a module when integrated with a rotor/structure dynamic program. The program is capable for design/analysis of fifteen (15) bearing types. It covers widely used bearings including journal bearings, tilting-pad bearings, thrust bearings and rolling element bearings such as ball, roller and tapered roller bearings. As ceramic materials may be applied to bearing surfaces to improve durability of bearings, porous bearings or bearing with porous surfaces become popular. All fluid-film bearings can have both solid wall and porous wall (porous bearings). It also handles incompressible lubricants (oil/liquid bearings) as well as compressible lubricants( air/gas bearings).
Bearing dynamic coefficients, Stiffness and Damping are calculated as functions of the rotor speed and the applied load. In other words, it calculates dynamic coefficients based on the given rotor load and the rotor speed. This approach makes the program ready to be integrated with a rotor dynamic program to provide rotor-speed-dependent bearing coefficients.
(2) BrgRotor is a truly integrated bearing-rotor dynamic simulation program. It employs distributed-mass approach with rotary inertial and gyroscopic effects included in the dynamic equation formulation. It differs from lumped-mass approach in enabling rotary inertial to be included. It is different from finite element approach in being easier to deal with gyroscopic effects.
Currently, this program focuses on the lateral vibration of a flexural rotor. Bearing library software is integrated as a module to provide speed-dependent dynamic coefficients which includes cross-coupled stiffness and damping.
The program performs calculations of critical speed (without damping) , unbalance response, asynchronous resonance and response (with damping) and stability.