Bearing load online monitoring method based on eddy current displacement sensor

Abstract

A bearing load online monitoring method based on an eddy current displacement sensor comprises the steps of firstly, arranging the eddy current displacement sensor on a widened bearing inner ring, andmonitoring radial, axial and angular static displacement s of a bearing under different loads and rotating speeds; then constructing a quasi-static model of a bearing: K (alpha).s=F; analyzing an influence degree of a bearing design parameter K(alpha) on a bearing displacement by applying finite element simulation software, and screening out a design parameter alpha T with a greater influence; obtaining an error between an experiment result and a simulation result by utilizing a calculation method, and further correcting the design parameter alpha T with a relatively large error mean value; and finally, constructing an association model by applying a graph neural network method, and identifying the contact state of the bearing by utilizing a deep learning algorithm to realize online monitoring and evaluation of the precision of the load monitoring model under a bearing operation condition so as to judge whether the load displacement relationship of the bearing needs to be calibrated again.

Description

technical field [0001] The invention relates to the technical field of bearing load monitoring, in particular to an online bearing load monitoring method based on an eddy current displacement sensor. Background technique [0002] Load is a key physical quantity that reflects the operating state of the bearing. Its measurement method has always been a hot spot in the field of bearings. Continuous load measurement, on the one hand, helps to detect abnormal loads and avoid serious accidents caused by bearing failures. On the other hand, it can be used as a system control The effective input of the control bearing service status. At present, there are two common methods of bearing load monitoring, direct monitoring and indirect monitoring. [0003] Direct monitoring is to use various force sensors, such as elastic rings, custom force sensors, etc. to directly measure the bearing load. However, due to the large size of the force sensor, this solution is difficult to integrate in...

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Problems solved by technology

Deformation monitoring mainly uses strain gauges or optical fiber sensors to monitor the micro-deformation of bearing components to achieve load monitoring, but this method requires modification of the bearing components themselves, and the surface where the strain gauges are located cannot be directly stressed, so it is only suitable for specific occasions; based on static The displacement monitoring method directly monitors the static displacement of the inner and outer rings, and calculates the bearing force by using the relationship between displacement and load. The nonlinear mapping function of the bearing changes with the working conditions of the bearing (such as speed, load, temperature, etc.), so establishing a nonlinear mapping function under each working condition becomes the key and difficulty of load monitoring based on static displacement

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