Accelerated stress level selection method for accelerated life test of space grease lubricated bearings
An accelerated life test and accelerated stress technology, which is applied in the direction of mechanical bearing testing, etc., can solve the problem that the accelerated stress level of the accelerated life test of grease lubricated bearings cannot be reasonably selected, and achieve the effect of ensuring consistency
Active Publication Date: 2020-06-16
SICHUAN UNIV
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0006] The technical problem to be solved by the present invention is to propose a method for selecting the accelerated stress level of the accelerated life test of the space grease lubricated bearing to solve the problem that the accelerated stress level of the accelerated life test of the grease lubricated bearing cannot be reasonably selected
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] For rolling ball bearings, the selection of accelerated stress during the accelerated life test is very important for the accelerated life test. Appropriate selection of accelerated stress can not only effectively carry out accelerated life test, but also greatly save the budget economically. Combined with increasing the load and increasing the speed, they are combined as the accelerated stress, and the accelerated life test is carried out on the test slewing bearing, which makes up for the shortcomings caused by the single loading stress. While ensuring the same failure mechanism, the appropriate accelerated stress can be selected Level, and achieve a greater acceleration effect, while loading the speed and loading load to achieve the effect of acceleration stress controllability.
[0030] (1) Selection of accelerated stress
[0031] It can be known from the bearing rating life calculation formula:
[0032]
[0033] Among them, C is the basic rated dynamic load, P...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to the field of machinery device life test, discloses an acceleration stress level selection method for the space grease-lubricated bearing acceleration life test and aims to solve a problem that the acceleration stress level of the grease-lubricated bearing acceleration life test cannot be reasonably selected. The method is characterized in that firstly, the ratio lambda ofthickness of an oil film to roughness of a contact surface when a bearing is working under normal stress level is calculated, based on the obtained lambda, minimum grease film thickness H between bearing balls and an inner ring surface is calculated, according to the H, minimum oil film thickness hmin between the bearing balls and an inner ring is obtained, the speed threshold specified in a grease design manual is then utilized as the speed n of the acceleration life test, the maximum bearing load Qmax of the balls is calculated according to the hmin and the n, the acceleration stress for theacceleration life test is then solved based on the Qmax, whether the obtained acceleration stress exceeds a bearing range of a test bench is determined, if yes, the n value is lowered down through adjustment, and Qmax is recalculated till requirements are met. The method is advantaged in that the method is suitable for the bearing acceleration life test.
Description
technical field [0001] The invention relates to the field of life testing of mechanical devices, in particular to a method for selecting accelerated stress levels for accelerated life tests of space grease lubricated bearings. Background technique [0002] Due to the existence of complex conditions such as alternating temperature, high vacuum, microgravity, strong radiation, and atomic oxygen in space, aerospace machinery products are expensive, long-lived, and irreparable. The aerospace field puts forward higher requirements on the reliability and life prediction of mechanical components. The actual working time of the bearing can be as many as several years or even more, especially the bearings used in the aerospace field, so the 1:1 life reliability verification test is carried out on the bearing in the actual environment Still unacceptable in terms of time. Therefore, we need to verify the reliable working ability of the bearing and the remaining life prediction of the...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/04
Inventor 苗强曾小飞王剑宇刘慧宇莫贞凌张恒
Owner SICHUAN UNIV