Abstract
In order to study the influence of torque load on the lubrication and wear of the sliding bearing of the rigid rotor system, the theoretical and experimental researches on the single-span rotor system with low speed were carried out. A special force sensor was used to measure the bearing load under different torque excitations, and the oil film pressure was calculated. The oil film pressure and thickness of sliding bearing under low speed (210r/min) were simulated by combining the lubrication theory. Based on the film thickness ratio theory, the corresponding relationship between the lubrication state and the torque load value was deduced. In addition, the wear rate and abrasive grain morphology of sliding bearing with different torque values were analyzed by means of oil sample preparation to verify this correspondence. The results show that the film thickness ratio has a logarithmic function relationship with the constant torque load, and the film thickness ratio curve can be used to determine the corresponding torque values under different lubrication states. The wear rate under mixed lubrication state increases exponentially with the torque load, and the main wear mechanism is adhesive wear and abrasive wear. The research results have certain guiding significance to the adjustment of the actual running condition of sliding bearing and its life prediction.
Highlights
For large-sized rotating machines such as steam turbines, kinematic pairs between journals and bearings are sliding friction pairs, and the frictional wear of friction pairs directly affects the operating performance of rotor systems
This paper, based on the single-span double-disc rotor test bench, studies changes in the bearing load, oil film pressure, and oil film thickness of sliding bearings of rigid rotor systems under constant torque loads and identifies the lubrication states of sliding bearings under constant rotating speeds and torque loads based on the film thickness ratio
The motor and rotating shaft are connected via the elastic pin coupling, both ends of the disc are supported by the sliding bearing, and the bearing force transducer between the sliding bearing and bearing block are used for collecting load information of supports of the rotor system under different torque loads
Summary
For large-sized rotating machines such as steam turbines, kinematic pairs between journals and bearings are sliding friction pairs, and the frictional wear of friction pairs directly affects the operating performance of rotor systems. Sun et al [29] studied the law of axis changes of rotor systems subjected to abrupt torque loads, considering the effects of torque loads on bearing loads. The wear particles generated in wear, fatigue, and corrosion are important information carriers of bearing wear They can be directly collected from lubricating oil samples and monitored in a real-time manner. This paper, based on the single-span double-disc rotor test bench, studies changes in the bearing load, oil film pressure, and oil film thickness of sliding bearings of rigid rotor systems under constant torque loads and identifies the lubrication states of sliding bearings under constant rotating speeds and torque loads based on the film thickness ratio. This paper studies the effect of torque loads on wear volumes of sliding bearings through ferrography of the collected oil samples to provide a theoretical basis for further prediction of the wear and residual life of sliding bearings under torque loads
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