This page presents for the most common types of bearing units in rotating machines. The company experts have accumulated years of experience in the simulation of various bearing properties. Users of the DYNAMICS R4 are provided with methods for simulation and analysis of rotor systems with ROLLING BEARINGS , HYDRODYNAMIC BEARINGS , GAS DYNAMIC BEARINGS and MAGNETIC BEARINGS.
Rolling bearings
The most commonly used in turbomachinery are single row ball and roller bearings. The bearings are described with 2-degree or 5-degree of freedom models.
In the calculator mode, the 5-point models allows to obtain bearing stiffness matrices taking into account geometry, ring interference, clearances, axial and centrifugal forces, etc.
Hydrodynamic bearings
In the DYNAMICS R4 software there is a DynFB module for analysis of sleeve bearings.
The bearing input data are its geometry, the type of lubricant and its performance, external loads and their direction, gravity force, the rotor shaft speed, the lubricant supply temperature, the temperature of the parts surrounding the bearing – the shaft and housing.
The transfer of dynamic characteristics to the rotor calculation model is carried out automatically, which reduces the time for rotor model preparation. Both stationary non-stationary analysis for a quasi-linear or non-linear model can be carried out.
Gas dynamic bearings
The [DynFB] module includes algorithms for calculation of the gas dynamic, or airfoil bearing static and dynamic characteristics. DYNAMICS R4 provides with 3 templates and examples of their filling with initial data.
The input data are the bearing geometry, the elastic rings in bearing clearance geometry, the type and characteristics of the bearing operational gas, the shaft speed, the gas temperature at the bearing inlet, external and weight loads, and others.
Like in the hydrodynamic bearings, the transfer of dynamic characteristics to the calculation model of the rotor is carried out automatically.
Magnetic bearings
Nowadays the active magnet bearings are becoming in demand, as they allow increase of the rotor support durability up to the values that far longer than the rolling and plain bearing one. The main direction of their application is stationary turbo drives and pumps, electric motors, turbo-generators. The issues of magnetic bearings application in gas turbines are also considered.
Our company specialists have considered the issues of the dynamic characteristics control in the engines with AMB, which allows, in throughput modes, to completely get rid of resonant situations associated with critical rotor speeds. At the same time, methods of adaptive control have been developed for rigid and flexible rotors.
