Influence of surface texture on dynamic characteristics of rotor–bearing system of centrifugal pump

The consequence of equipment vibrations is casual hitches and outages of such critical systems in the mining industry as pumping units, which leads to grave financial aftereffects connected with in-process losses and higher repair expenses. This study analyzes modification of face of a radial hydrodynamic sliding bearing of a centrifugal pump with a special microtexture, and the influence of the latter on the dynamic characteristics and stability of the rotor–bearing system. The calculation of the local and integral characteristics of stiffness and damping used a dimensionless modification of the Reynolds equation including non-stationarity and the finite difference approximation. The stability estimate involved an equivalent stiffness, logarithmic damping decrement, instability speed, as well as the orbits calculated by integrating of equations of rotor motion using a stable multi-step method. It is shown that the proposed type of the surface texture intensifies the response of an oil wedge and increases the marginal stability: at the eccentricity of 0.5, the increment in the equivalent stiffness reaches 40%, and at the eccentricity of 0.8, the increment exceeds the three-time level of a relatively smooth surface; the critical speed elevates by up to 5 times. Within a working range of the eccentricity, the damping decrement remains comparable with a smooth bearing, which points at the preserved damping capacity. The analysis of the orbits shows a decrease in the area of the static loop by 49%, which conforms with the contraction of the amplitude of stationary vibrations. In this manner, the special surface texture enables higher vibration resistance in the rotor–bearing systems of pumps, and can be a tool of the system dynamics adjustment in severe operation conditions. 

Bashmur K. A., Zagulyaev A. V. Influence of surface texture on dynamic characteristics of rotor–bearing system of centrifugal pump. MIAB. Mining Inf. Anal. Bull. 2026;(5):20-38. [In Russ]. DOI: 10.25018/0236_1493_2026_5_0_20.

K.A. Bashmur¹, Graduate Student, Senior Lecturer, e-mail: bashmur@bk.ru, Scopus Author ID: 57209698696, ORCID ID: 0000-0002-9977-473X,
A.V. Zagulyaev¹, Graduate Student, Teaching Assistant, e-mail: shura.zagulyaev@mail.ru, Scopus Author ID: 57216805089,
¹ Siberian Federal University, 660025, Krasnoyarsk, Russia,

K.A. Bashmur, e-mail: bashmur@bk.ru.

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