scholarly journals Research on the Reliability Allocation Method of Smart Meters Based on DEA and DBN

2021 ◽  
Vol 11 (15) ◽  
pp. 6901
Author(s):  
Juan Zhou ◽  
Zonghuan Wu ◽  
Zhonghua Yu
Keyword(s):  
Structural Complexity ◽  
Dynamic Bayesian Networks ◽  
Accelerated Life Test ◽  
Design Stage ◽  
Smart Meters ◽  
Allocation Model ◽  
Reliability Allocation ◽  
Allocation Method ◽  
Accelerated Life ◽  
Manufacturing Testing

Reliability allocation can reasonably determine the reliability index of each unit in the system to ensure product quality in design, manufacturing, testing and acceptance. In the design process of the smart meter, the preliminary reliability allocation results may be unreasonable, so in the middle and later stages of the design stage, the reliability needs to be reallocated. The traditional allocation method has some limitations, such as strong subjectivity, large amount of calculation and too much reliance on expert judgment. In order to solve these problems, this paper presents a multi-method fusion method of reliability allocation. First, this paper uses the goal-oriented methodology (GO methodology) to integrate dynamic Bayesian networks (DBNs) to predict the reliability of smart meters. Second, a data envelopment analysis (DEA) reliability allocation model is established, the posterior probability obtained by DBN reasoning together with the failure rate and structural complexity of each unit are used as the output indicators of this model. Finally, the reliability allocation weight is calculated by using the efficiency value obtained from the DEA reliability allocation model. The validity and accuracy of this method is verified by an accelerated life test. This provides a new idea for reliability reallocation of smart meters.

Reliability Analysis of CNC Machine Tools Based on Fuzzy Theory

2015 ◽  
Vol 713-715 ◽  
pp. 7-10 ◽  
Author(s):  
Li Tao
Keyword(s):  
Machine Tools ◽  
Comprehensive Evaluation ◽  
Fuzzy Theory ◽  
Fuzzy Comprehensive Evaluation ◽  
Cnc Machine Tools ◽  
Uncertain Information ◽  
Cnc Machine ◽  
Allocation Model ◽  
Reliability Allocation ◽  
Allocation Method

There are many factors influencing the reliability allocation of CNC machine tools and some are difficult to analyze quantitatively, a comprehensive reliability allocation method is proposed using interval analysis, fuzzy comprehensive evaluation and analytic hierarchy process. Many influence factors were considered and endowed with different weight respectively according to the influence degree. In this paper, a reliability allocation model is proposed for CNC machine tools, which used interval number instead of real number to express uncertain information. It could make use of the field test information and experts’ experience comprehensively. Finally, the application of this method is illustrated with an example, and the results showed that the allocation method is feasible and effective for the reliability allocation of CNC machine tools.

A Fuzzy Similarity-Based Approach to Reliability Allocation of Diesel Engine

2011 ◽  
Author(s):  
Zhong-Zhe Chen ◽  
Yu Liu ◽  
Hong-Zhong Huang ◽  
Dan Ling ◽  
Li-Ping He
Keyword(s):  
Diesel Engine ◽  
New Products ◽  
New Product ◽  
New Method ◽  
Design Stage ◽  
Reliability Allocation ◽  
Reliability Indices ◽  
Domain Experts ◽  
Fuzzy Similarity ◽  
Allocation Method

Most of new products evolve based upon existing products. The reliability indices and maintenance records of existing products are very important to provide useful information for the reliability allocation of the new evolutionary products. In this paper, a fuzzy similarity-based reliability allocation method which considers not only the similarity between the new product and old ones, but also the judgments from domain experts, is proposed to realize a reasonable reliability allocation at the initial design stage of diesel engines. The new method allows for using both the objective information from the old products and the subjective judgments from experts simultaneously, and it is more comprehensive and objective compared to the traditional reliability allocation method.

A Comprehensive Reliability Allocation Method of Feed Mixers Based on Fuzzy Synthetic Assessment

2015 ◽  
Author(s):  
Dong Yang ◽  
Yu Sun ◽  
Kai Wu
Keyword(s):  
Fuzzy Number ◽  
Influence Factors ◽  
Triangular Fuzzy Number ◽  
Uncertain Information ◽  
Allocation Model ◽  
Reliability Allocation ◽  
Allocation Method ◽  
Fuzzy Synthetic Assessment ◽  
Comprehensive Reliability ◽  
Synthetic Assessment

To solve the problem that there are many factors influencing the reliability allocation of feed mixers, and some of which are difficult to analyze quantitatively, a comprehensive reliability allocation method is researched using triangular fuzzy number, fuzzy synthetic assessment and analytic hierarchy process. In this paper, a reliability allocation model is proposed for feed mixers, which considered several influence factors, and used triangular fuzzy number instead of real number to express uncertain information. It could make use of the reliability test information and experts’ experience comprehensively. Finally, the application of this method is illustrated with an example, and the result showed that the allocation method is feasible and effective for the reliability allocation of feed mixers.

scholarly journals A New and Practical Reliability Allocation Method for a Complex System of NC Turrets

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Wei Hu ◽  
Fei Chen ◽  
Yankun Wang ◽  
Qunya Xie
Keyword(s):  
Complex System ◽  
Failure Modes ◽  
Expert Knowledge ◽  
Fault Tree ◽  
Complete Information ◽  
Design Stage ◽  
Reliability Allocation ◽  
Early Design ◽  
Early Design Stage ◽  
Allocation Method

Existing methods cannot satisfy the reliability allocation demands of the early design phase for the modern complex system of NC turrets. Motivated by the need of practical application, this paper proposes a new and practical reliability allocation method in the early design stage for NC turrets considering failure mode and system complexity, information inaccessibility, and expert knowledge limitation. First, the fault tree of a NC turret is quickly built to clear the relationship between the system’s compositions and failure modes up. Second, the happening probability of each failure event in the fault tree is firstly calculated by fuzzy expert evaluation to provide the reliability allocation with complete information. Third, by discussing the practical meaning of every layer in the fault tree, the proposed allocation strategy is within the experts’ knowledge scope for evaluating accurately. Eventually, the application result of the AK36100 A turret is presented and compared with some existing allocation methods, illustrating the rationality of the proposed allocation method.

Study of High-Power White LED's Lifetime Based on Accelerated Life Test

2013 ◽  
Vol 800 ◽  
pp. 205-209 ◽  
Author(s):  
De Sheng Li ◽  
Nian Yu Zou ◽  
Yun Cui Zhang ◽  
Xiao Yang He ◽  
Yi Yang
Keyword(s):  
High Power ◽  
Accelerated Life Test ◽  
Reliability Test ◽  
White Led ◽  
Life Test ◽  
Arrhenius Model ◽  
White Leds ◽  
Accelerated Life ◽  
Temperature Levels

The study of LED reliability becomes more and more important with LED widely used in various areas, and accelerated life test (ALT) as an element of reliability test is widely used to predict the lifetime of LED. In this paper, ALTs have been carried out at various current levels and various temperature levels. In the current ALT experiment, three kinds of stressing currents were demonstrated for 1W white LEDs and lumen flux of the tested LEDs were studied, and based on Eyting model, lifetime of the tested LEDs is calculated about 6.86×105h. In the temperature ALT experiment, two kinds of stressing temperature were demonstrated for the same type of white LEDs and lumen flux were also studied, and based on Arrhenius model, lifetime of the tested LEDs is calculated about 7.41×105h. In addition, the color shifting velocity is faster than lumens depreciation velocity was observed in our experiment, which means the lifetime evaluating of white LED should be paid more attention.

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