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Statistical analysis method of accelerated life tests based on fuzzy theory

A technology of accelerated life test and fuzzy theory, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems such as accelerated life test fuzzy theory research, and achieve the effect of reference value and reasonable results

Active Publication Date: 2014-10-01
BEIHANG UNIV
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Problems solved by technology

[0008] However, so far there has been no study of fuzzy theory in accelerated life tests

Method used

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  • Statistical analysis method of accelerated life tests based on fuzzy theory
  • Statistical analysis method of accelerated life tests based on fuzzy theory
  • Statistical analysis method of accelerated life tests based on fuzzy theory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0090] In order to evaluate the average life of a certain type of motor under the operating voltage of 10V, four accelerated voltage levels were selected for constant addition test. The data of voltage level, sample size and failure number are shown in Table 1.

[0091] Table 1 Test data

[0092]

[0093] Step 1. Use fuzzy theory to reasonably fuzzify the constant plus truncated data to obtain fuzzy failure data

[0094] (1) Determine the life distribution and acceleration model of the product

[0095] A product follows an exponential life distribution. Obey the basic assumptions (1) and (2).

[0096] Model: The voltage is used as the acceleration stress, and the acceleration model is selected as the Irene model:

[0097]

[0098] (2) Fuzzy life data

[0099] In the present invention, the central value of the fuzzy failure time is set as the detection value, and the fuzzy amplitude is set as the detection time interval under the stress level. Therefore, the fuzzy am...

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Abstract

The invention discloses a statistical analysis method of accelerated life tests based on a fuzzy theory. The statistical analysis method comprises a first step of reasonably fuzzifying failure terminated censoring of constant-stress accelerated life tests, thereby obtaining fuzzy failure data, a second step of building a fuzzy statistical model of the accelerated life tests by use of a maximum likelihood method, and a third step of performing estimation on model parameters and fuzzy prediction on lifetime and reliability. The statistical analysis method is capable of providing the fuzzy estimation values of the model parameters according to the built model and further providing the fuzzy lifetime prediction interval and the fuzzy reliability interval of products; compared with point estimation values provided by a traditional statistical analysis method, the results of the statistical analysis method are more reasonable and have better reference value.

Description

technical field [0001] The invention is a statistical analysis method of accelerated life test based on fuzzy theory, belongs to the technical field of accelerated life test, and is used for solving technical problems in the field of reliability and system engineering. Background technique [0002] In today's reliability engineering at home and abroad, the life and reliability evaluation of long-life and high-reliability products such as aerospace electronic products and optoelectronic products has become a research problem. Accelerated Life Testing (ALT) is a On the basis of the same mechanism, by looking for the physical and chemical relationship between product life and stress—the accelerated model, using the life characteristics under high (accelerated) stress levels to extrapolate and evaluate the life characteristics under normal stress levels. It is the key technology to solve this problem at present. [0003] In the accelerated life test, according to the censoring ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 李晓阳许瀚孙富强
Owner BEIHANG UNIV
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