Investigation of maximum fatigue load and life in bearings using fatigue criteria and multiaxial loading control methods

The mechanism of the vibration system includes the shaft vibration system, bearings, impeller, electric motor, controllers and sensors. In this article, despite the differences, the basis of the vibration system mechanism design is similar to the wind turbine mechanism. By making changes to the design of the vibration system mechanism and replacing the fluid flow, the performance of the vibration system mechanism can be simulated as the performance of rotating machinery, such as rotary compressors and centrifugal pumps in the oil, gas, and petrochemical industries. The goals of the vibration system mechanism design are to reduce fatigue loading, increase the life of rotating equipment, and properly control the performance resulting from output variables. This article consists of two parts. In the first part of the article, the maximum fatigue load and the bearing life were investigated. To determine the maximum fatigue load, the old MHCF criterion was presented. According to the MHCF criterion, the distribution of subsurface stresses of the vibration system and the characteristic points were analyzed by Abaqus CAE software and the graphs were drawn with other software. Based on the characteristic points, the Bielajev maximum shear stress theory with a maximum stress of ۲۲۸ MPa and the von Mises theory with a maximum stress of ۲۰۵ MPa have maximum fatigue loads. In another study, the Shimizu criterion for determining the maximum fatigue load related to the estimation of the bearing life showed that the changes in the normal stress curve of the vibration system equipment are greater than the fatigue life cycles compared to the shear stresses. It is necessary that the maximum fatigue load of the vibration system and the estimation of the bearing life are determined by the stress analysis of Abaqus CAE software and fatigue criteria. In the second part of the article, multiaxial loading control methods including input power control, torsion angle control, predictable fatigue load control, deformation control, and multiaxial loading control with sensors were examined. According to the control diagram of the vibration system mechanism, which has ۲ input variables and ۶ output variables, linear accelerations and rotational accelerations corresponding to output forces and output moments in the transverse direction have the highest values. In order to reduce multiaxial fatigue loading

کلیدواژه ها:

Fatigue load ، Bearing life ، Vibration system ، Multiaxial loading control ، Fatigue criteria