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A Study on Online Elimination for Oil Oscillation of Journal-Bearing System

Author: HeGuangMing
Tutor: DuanZiHua
School: Taiyuan University of Technology
Course: Physical and chemical
Keywords: Oil whirl The oil film oscillation Fault diagnosis Line elimination of
CLC: TH133.31
Type: Master's thesis
Year: 2011
Downloads: 154
Quote: 1
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Abstract


In With the the development of of scientific, technical and industrial economy,, sliding bearings machinery and equipment widely used in enough some industries of the power plants, Petroleum \u0026 Chemical, etc., and toward the large-scale, high-speed-scale, continuous, and the development of the automation the direction of, thereby makes the the the stability of the of the sliding bearing machinery and equipment the more to the more eye-catching. Oil whirl and the oil film oscillation failure Frequently Asked failure, in the is the sliding bearing rotating machinery equipment in the and a lot of destructive, Once the such failures occur on, the losses caused by will be very serious. On the the summed up the our predecessors a large number of the relevant the the basis of of the sliding bearing the oil whirl and the oil film oscillation characteristics, fault diagnosis, and and so on on research work, the the author in the, in order to achieve line elimination of oil oscillation for the purpose of, from the theoretical and experimental two aspects studied the sliding bearing - the rotor system caused by the the oil film force of the self-excited oscillation and their characteristics. In this paper, according to the the the theoretical basis of of the sliding bearing - fluid power lubrication theory, has derivation of the Reynolds equation of the dynamic pressure bearing of the, indicating that the bearing clearance oil film force was mainly due to the of the wedge-shaped of the fluid effect and the squeeze effect. And analyzed the the the factors that of the the oil film distribution of in the within the the affect the bearing with the journal gap and the size of the oil film force, the size of the the the geometric of the change in of the the the freedom of boundary of of the oil film with the bearing, roughness of the lubrication the surface of the, the the state of parameters and the physical properties of of the oil quality, the oil film movement Renault the number of Re and parameters of the movement of the bearing and other relevant. On the bearing motion of the rotor at the same time carried out force analysis of derivation of vibration equation in the under the the oil film vortex of moving the state and analyze the its vibration characteristics of. When the the the of vortex dynamics is greater than damping force when, the the bearing rotor system in an unstable state. Expounded the mechanisms and properties of of the oil whirl with the oil film Vibration Fault, and put forward the system factors influencing the stability and discriminant guidelines. On the sliding bearing oil film oscillation carried out experimental research, including as pivot shafts work rotational speed, lubricating oil the supply the amount of and viscosity of the-of its the impact of, as well as the the relationship between of the rotating shaft with the the axle bush gap volume of oil spills with the the work rotational speed, oil film oscillation in the operation the process of, and oil film the oscillation line elimination of made a The analysis of research was supported by the following conclusions: (1) in the 2n. Occurred near the the phenomenon of oil film oscillation, the rotor rotate the vibration displacement up-to-larger with, the pair of sliding bearing the the destructive of the - Rotor System is large, and half-frequency the impact of of the ingredients accounted for the dominant position. When the rotating machinery work rotational speed asked to higher than the 2nc when, it should be in the the close to the 2nc when liters at a to a more rapid rate-speed, weakened oscillation a in the the the under the action of of time on the system of the the extent of damage to. The (2) for oil slick the oscillation the phenomenon of of generated with the bearing - inter-bearing pads oil slick accumulation amount there is a direct Relationship between. When the the the amplitude of the the rotary shaft vibration is quick guide when the rising, the System-labile the oscillation start exacerbate, the boundary of the Lube membrane rupture Usage Frequency faster, susceptible to thrown off; the when the higher of the amplitude of the Continuing, the the amount of leakage of of the oil is almost zero; Continuing for a period of time after, with the the the improvement of of the forward to rotational speed, bearings, the oil of the bearing clearance was forced to thrown off, at the same time the amplitude gradually decreased, the oil film oscillation will automatically elimination of. Therefore, it can by controlling the that the the oil supply speed is indirect regulation and control the amount of lubricating oil the accumulation of in while the to achieve line elimination of oil oscillation. (3) The of of different lubricants the the impact of of the viscosity on the oil film oscillation is different, and the For the inherent critical speed different bearing rotor system used in conjunction with the the lubricating oil of the different viscosity, the on the the the impact of of the the amplitude of the oil film oscillation is is not the same. Experimental get the the four combinations of of the critical speed and viscosity: high η and high nc, low η and low nc, low-η and high nc, high η and the the low under the nc of, the the the phenomenon of oil film oscillation in turn strengthen the, that is, high-viscosity, low-the critical speed most prone to oil film oscillation, while the the critical rotational speed of the high viscosity and high the most is not easy to appear the oil film oscillation. Therefore, for the system of the different inherent of the critical speed, the appropriate choice of viscosity of the lubricant, is a kind of can guarantee the better the lubrication of effect also can weaken the the the a means of of the the phenomenon of oil film oscillation. In short, the the combined with of the sliding bearing rotor system of their own characteristics, such as the a combination of factors of the load rating, Operating Temperature, the rotational speed, the spindle with the bearing clearance and bearing structure, etc., selection of suitable lubricating oil and the quantity of lubricating oil as well as shaft speeds loading rate, the use of these means of to the achievement of oil film oscillation line elimination of have a very positive meaning, for the future the mechanical design of the sliding bearing, manufacture and use provides a wealth of experimental data and theoretical basis.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Moving parts > Bearing > Plain bearings
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