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A Method of Degradation Modeling and Life Prediction under Dynamic Conditions

A dynamic condition and life prediction technology, applied in design optimization/simulation, instrumentation, geometric CAD, etc., can solve problems that cannot solve engineering practical problems well, achieve the effect of eliminating errors and improving prediction accuracy

Active Publication Date: 2019-08-06
天航长鹰(江苏)科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0017] In product degradation modeling and life prediction, due to changes in the environment or loads, traditional methods cannot solve practical engineering problems well

Method used

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  • A Method of Degradation Modeling and Life Prediction under Dynamic Conditions
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  • A Method of Degradation Modeling and Life Prediction under Dynamic Conditions

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Embodiment Construction

[0064] The present invention uses a simulation method to verify its correctness. Suppose there are 100 products undergoing a 1300-hour degradation test, the environmental load (voltage) profile is as follows figure 2 shown. In the simulation process, the degradation data of the first 600 hours is used for model fitting, and then its reliability is predicted, and its prediction accuracy is verified by the failure data collected for the last 700 hours. Assuming that the product performance degradation process obeys the drift Brownian motion with cumulative effect term of degradation rate, stress damage and stress drift, the performance degradation process of the product can be written as:

[0065]

[0066]Among them, suppose the initial value X(0)=0, the diffusion parameter is σ, and the degradation rate function is the inverse power law function r(w(t))=a w(t) b , the sum of stress drift and impact damage Threshold D=6600, and its parameter settings are shown in Table 1...

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Abstract

The invention relates to a degradation modeling and life prediction method in a dynamic condition. The method comprises the steps of firstly collecting test data; secondly building a performance index degradation model, deleting an error caused by stress drift in the process, performing drift compensation, and estimating unknown parameters in the model; and finally performing life and reliability prediction. According to the method, the influence of environment and load changes on product performance degradation is considered, namely, the impact influence on a performance degradation rate and a degradation index is considered at the same time, so that the prediction method better meets the actual condition and the prediction precision is improved; and the impact damage caused by sudden environment and load changes is distinguished from the stress drift, so that the error of a prediction result due to the stress drift is eliminated.

Description

[0001] Technical field: [0002] The invention relates to a degradation modeling and life prediction method under dynamic conditions, and belongs to the technical field of degradation modeling and life prediction. [0003] Background technique: [0004] With the development of science and technology, the reliability requirements of products are getting higher and higher, especially in military fields such as aerospace, electronic ships, etc., the life and reliability of key components of weapons and equipment are very important. In view of the characteristics of long life and high reliability of military products, the method of performance degradation modeling is usually used to predict the life of products. Traditional degradation modeling methods are mainly carried out for static conditions. However, in the actual use of the product, the environment and load of the product may change over time, so the accuracy of the life prediction of the product using the traditional metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20G06F2119/06
Inventor 黄婷婷彭博周堃
Owner 天航长鹰(江苏)科技有限公司
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