Introduction: Bearing Optimization Approach

Hydrodynamic plain bearings play a crucial role in the overall reliability, vibration, and performance of rotary bearing systems. High-performance rotating machines operate at high speeds and subject bearings to significant static and dynamic loads. Consequently, bearing modeling must accurately simulate physical effects. However, the increasing complexity and demanding applications of bearings pose challenges for engineers striving to develop reliable designs.

One critical aspect of bearing design is optimizing the bearing clearance to prevent metal-to-metal contact, especially under heavy loading. This optimization is closely linked to the selection of the minimum oil film thickness (MOFT), which becomes a limiting factor during the process. Another limitation to consider is the maximum allowable level of bearing loading (eccentricity).

The variable parameters that can be considered in the optimization process are as follows:

• Bearing clearance (Cb)
• Radius (R)
• Bearing length (L)
• Bearing grooves positions
• Oil supply temperature (Tin)
• Oil viscosity (Visc)
• Load factor (Load_f)

 

­Objective functions and constraints:

• Minimum Power loss (Nfr)
• Minimal allowable oil film thickness (MOFT)
• Maximum allowable level of bearing loading (E)

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Since bearings are integral to the rotor system, the next optimization step involves analyzing the rotor dynamics simulation for a rotor-bearing system. This analysis ensures that resonances are avoided, and sufficient margins are provided to separate critical speeds from the operating speed. Continue reading “Bearing Optimization: Enhancing Reliability and Performance in High-Speed Machines” →