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Experimental assessment reveals that viscosity index and oil temperature influence rotor vibration, suggesting improvements for mechanical stability.
The viscosity index of lubricating oil is a key factor influencing the vibration behavior of flexible rotors and the operational stability of equipment. This study investigates the effects of disk position and oil temperature on rotor vibration under varying viscosity indices, using a dual-disk loading setup. A vibration testing platform for flexible rotors with dual disks was established, and experiments were conducted under different operating conditions using four lubricating oils with varying viscosity indices. The results indicate that vibration amplitude variations are not entirely consistent across different lubrication conditions, reflecting the regulatory effect of lubrication performance on structural dynamics. Shifting the disk to the right alters the system's dynamic characteristics; low-viscosity oils tend to increase vibration amplitude and reduce critical speed, whereas high-viscosity-index oils contribute to system stabilization. Lubricants with a low viscosity index show an increase in amplitude at high temperatures, indicating poor film stability, while high viscosity index oils reduce amplitude, suppress vibrations, and offer better stability. This study provides deeper insights into the influence of viscosity index on rotor characteristics, offering theoretical support for optimizing lubrication systems, reducing vibration, and enhancing the mechanical operational stability.
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Guo et al. (2025) studied this question.
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