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A small sample reliability evaluation method of carrier drive axle

A bridge boy and reliability technology, which is used in the field of reliability evaluation of carrier drive axles

Active Publication Date: 2019-01-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for evaluating the reliability of a small sample of a loader drive axle, which solves the defect that the sample of a loader drive axle is less and cannot be evaluated by existing test methods

Method used

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  • A small sample reliability evaluation method of carrier drive axle
  • A small sample reliability evaluation method of carrier drive axle
  • A small sample reliability evaluation method of carrier drive axle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] A method for evaluating the reliability of a loader drive axle, comprising the following steps:

[0118] 1) Three fatigue life experimental data of the drive axle of the loader were measured by the experiment x (0) (1) = 39476.16h, x (0) (2) = 42275.04h, x (0) (3) = 41181.92h;

[0119] 2) Establish a GM(1,1,k) model, such as figure 2 , image 3 shown;

[0120] by the original sequence: x (0) ={39476.16, 42275.04, 41181.92}, for non-negative original sequence x with no rules to follow (0) Through formula (1):

[0121]

[0122] Carry out an accumulation to get: x (1) ={39476.16,81751.2,122933.12}.

[0123] Where: n is the total number of experimental data, n=3 in this example.

[0124] Mathematics proves that accumulative generation can convert any non-negative sequence to keep x (0) A monotonically increasing sequence of information,

[0125] This makes forecasting regular. At the same time, the cumulative generation has probabilistic significance. It ca...

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Abstract

The invention provides a method for evaluating the small sample reliability of a loader drive axle, which comprises the following steps: 1, respectively carrying out fatigue life tests on n loader drive axle samples to obtain n test data; 2, establishing a GM model according to the n test data obtained in the step 1, and expanding the n original test data obtained in the step 1 to m + n sample data by a GM grey prediction method to obtain a test sample X; 3, obtaining the life average value uY and the standard deviation sigma of the test sample X obtain in the step 2 by using the Bootstrap method; 4, obtaining the lower limit value uYmin of the life average value uY of the test sample corresponding to the confidence level of 75% according to the life average value uY and the standard deviation sigma of the test sample obtained in the step 3; 5, calculating the reliability index of the loader drive axle according to the lower limit value uYmin obtained in the step 4. The invention can effectively estimate the probability density function by using a small number of samples obtained, and solves the problem of reliability analysis of the loader drive axle with small sample characteristics.

Description

technical field [0001] The invention belongs to the technical field of reliability evaluation of mechanical products, and in particular relates to a method for evaluating the reliability of a small sample of an aircraft drive axle. Background technique [0002] Loader belongs to the category of shovel transport machinery, is a very versatile construction machinery, can be used for loading and unloading, handling, leveling materials and light shoveling operations, widely used in construction, mines, highways, railways, hydropower, national defense projects and urban infrastructure. [0003] When the loader is working: the drive axle further increases the torque transmitted from the output shaft of the transmission, and further reduces the speed to overcome the resistance of the wheels, and at the same time transfers the input power to the wheels by changing the direction of 90°; the drive axle solves the problem through the differential. The differential speed of the left an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/13G06F17/18
CPCG06F17/13G06F17/18G06F2111/10G06F2119/04G06F30/17G06F30/20
Inventor 曹蕾蕾王严曹露露刘奎白杰古玉锋樊浩
Owner CHANGAN UNIV
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