Method of detecting life state of spatial rolling bearing based on vibration-sensitive time-frequency characteristics

A time-frequency feature, rolling bearing technology, applied in the field of life state detection of space rolling bearings, can solve problems such as high-dimensional classification and recognition, and achieve the effects of enhanced representation, good application effect, and easy pattern recognition.
CN104807640AInactive Publication Date: 2015-07-29CHONGQING JIAOTONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
CHONGQING JIAOTONG UNIVERSITY
Publication Date
2015-07-29
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention relates to a method of detecting life state of a spatial rolling bearing based on vibration-sensitive time-frequency characteristics and belongs to the technical field of reliability estimation and life prediction for rolling bearings. The method includes: establishing a life state characteristic set of the spatial rolling bearing via vibration frequency-domain characteristic parameters to represent the life state; removing non-sensitive characteristics in the life state characteristic set by means of life sensitivity index computation, and establishing a life state sensitive characteristic subset to enhance representation of the life state; subjecting the life state sensitive characteristic subset to dimensionality reduction and redundancy removal by a linear local tangent space alignment algorithm so as to obtain a low-dimensional life state characteristic set with good class characteristics; using a nearest neighbor classifier to recognize different life states of the spatial rolling bearing. The method allows the life state of the spatial rolling bearing to be accurately recognized and is better in application effect.
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Description

technical field

[0001] The invention belongs to the technical field of reliability evaluation and life prediction of rolling bearings, and relates to a method for detecting the life state of space rolling bearings based on vibration-sensitive time-frequency characteristics. Background technique

[0002] The life of a space rolling bearing refers to the total number of turns or total hours of normal operation of the bearing under a certain working environment and conditions (such as speed and load). In engineering practice, due to factors such as the speed, load and working environment of space bearings, it is impossible to test and count the number of bearing rotations, so it is necessary to seek new characteristic quantities to characterize and evaluate the bearing life. At present, for space rolling bearings, the commonly used test methods at home and abroad include tribological characteristic analysis, friction torque test and temperature test, but these characteristic qu...

Claims

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