Establishing method of fractional-order damping rolling bearing fault dynamic gradual-change model
A technology of rolling bearings and fault models, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc.
Active Publication Date: 2019-06-28
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to ensure the safe and stable high-speed operation of the rotating machinery by improving the analysis method of the dynamic model of the rolling bearing, reduce the vibration and noise level, and improve the production efficiency
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[0104] The present invention will be further described below in conjunction with the accompanying drawings.
[0105] The rolling bearing surface damage fault dynamics modeling method of the present invention comprises the following steps:
[0106] Current rolling bearing fault models (such as figure 1 As shown), the model simplifies the fault into a rectangular groove, and the deformation will only be caused at the moment when the rolling element and the fault occur and break contact, and the amount of deformation is equal to the depth of the fault. And the actual rolling bearing fault should be (such as figure 2 As shown in the circular arc defect, the rolling body will not be completely deformed at the moment of contact with the fault, and the maximum deformation will only be reached when the rolling body touches the bottom of the fault.
[0107] 1. Rolling bearing inner ring fault model:
[0108] Assuming that when there is a local damage fault at a certain point on the...
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The invention discloses an establishing method of a fractional-order damping rolling bearing fault dynamic gradual-change model. On the basis that the contact equivalent rigidity and damping of a rolling bearing are obtained, influence of a lubricant and influence of a rolling body passing fault on the inner-ring self deflection are considered, and a rolling bearing gradual-change dynamic model with a single pitting erosion fault is established; and a fractional-order calculus theory is applied to the rolling bearing, a fractional-order damping force calculation formula is derived, and a rolling bearing inner ring fault model, a rolling bearing outer ring fault model and a rolling bearing rolling body fault model taking the fractional-order damping into consideration are established. The model is comprehensive, and can effectively reflect the historical dependence process of the system, a good effect can be achieved via few parameters; the physical value is clear, and expression is simpler; and influence of lubricating oil between the rolling body and the inner ring is considered in the model.
Description
technical field [0001] The invention relates to bearing dynamics and fault diagnosis technology, in particular to a method for establishing a fractional-order damping rolling bearing fault dynamics gradient model. Background technique [0002] Rolling bearings transmit motion in various machines. Rotors are the most important parts in rotating machines. They have the advantages of small friction, easy start-up, simple lubrication, and easy replacement. They are widely used in precision instruments, aerospace, automobiles, machine tools, and robots. . During the operation of rolling bearings, the bearings may be damaged prematurely due to poor lubrication, fatigue, wear, etc. Statistics show that 30% of rotating machinery failures are caused by bearings. Once the bearing fails, it will trigger a series of adverse reactions, which may lead to the strike of the running machine or even the shutdown of the production line, which will bring huge economic losses to the enterprise;...
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Inventor 李志农李云龙
Owner NANCHANG HANGKONG UNIVERSITY