Vibration response simulation analyzing method for rolling bearing with single-point failures

Abstract

The invention relates to a vibration response simulation analyzing method for a rolling bearing with single-point failures. On the basis of a Hertz contact theory, related knowledge about kinematics and kinetics are utilized to establish a five-degree-of-freedom nonlinear vibration mode of a rolling bearing and kinetic differential equations of the rolling bearing while influencing factors like slipping of rolling balls, oil slick rigidity and the like are taken into consideration, according to that the rolling balls change due to contact deformation is caused when the rolling balls roll through partial failures, a partial failure model of the rolling bearing is introduced into the kinetic differential equations of the rolling bearing, and the single-point failures of the rolling bearing are classified according to length-width ratios of the failures and size ratios between the failures and the rolling balls so as to establish different failure shape functions; the differential equations are solved by an ode solver in MATLAB (matrix laboratory) software, and vibration responses of the rolling bearing are simulated when an inner ring, an outer ring and the rolling balls of the rolling bearing are suffered from the single-point failures. By the aid of the vibration response simulation analyzing method, vibration responses of the bearings with failures in different sizes can be simulated. Compared with traditional methods for acquiring vibration responses of failed bearings, the vibration response simulation analyzing method has the advantages that an experimental period is short and experimental cost is saved. The computation for the vibration responses for the failed rolling bearings can lay the foundation of late failure diagnosis for the rolling bearings.

Description

technical field [0001] The invention belongs to the field of simulation analysis, and in particular relates to a vibration response analysis method, in particular to a vibration response simulation analysis method of a rolling bearing containing a single-point fault of an inner ring, an outer ring or a rolling body. Background technique [0002] Rolling bearings are common components commonly used in rotating machinery, and their dynamic behavior affects the dynamic behavior of the entire system. When a rolling bearing fails, it will induce the failure of the entire system. According to statistics, 30% of rotating machinery failures are caused by bearing failures. Therefore, it is very important to carry out condition monitoring and fault diagnosis research on rolling bearings to maintain the normal operation of equipment. However, due to unclear mechanisms, improper technology and unobvious characteristics Misdiagnosis and missed diagnosis caused by other reasons occur from...

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Problems solved by technology

The traditional method is to obtain vibration signals through artificial setting of faults or to wait for the na

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