Wei Dong Liu

Nanchang University

The failure mode risk evaluation results of FMEA are affected by multi-uncertainties. This paper proposes a risk evaluation methodology for controlling multi-uncertainties in the assessment process. First, the fuzzy confidence interval number (FCIN) evaluation model is provided to control the uncertainty in assessing the severity (S), occurrence (O...

PV modules are characterized by high reliability and long life. Accurately assessing the field reliability of PV modules is extremely important for manufacturers and users. However, how to further determine the applicable geographical regions of reliability assessment results obtained at certain installation locations, which is of great significanc...

It is urgent to solve the problems of low efficiency, high cost and lack of system integrity when PFMEA identifies potential process failure modes in the process of multi-variety and small batch production. Current study innovatively proposes a machine identification method of potential process failure modes based on the combination of process cons...

Solar photovoltaic (PV) technologies have developed rapidly in recent years. As the core part of PV system, performance of PV modules largely determines the output of PV system. Module performance gradually degrades during operation, and the degradation is generally variant at different sites due to the differences in climatic stresses. Thus, it is...

This study proposes a methodology to optimize photovoltaic (PV) module tilt angle based on regional clustering and cost evaluation. The factors that affect the power generation of PV module have significant geographical differences and coupling characteristics, and the impact of each influencing factor varies at different installation parameters. I...

The field reliability of photovoltaic modules is important to make investment, design, operation and maintenance decisions in PV power generation projects. By minimizing the field reliability differences between the congeneric regions of PV modules, a regional clustering method based on the factors influencing field reliability is proposed, and a m...

Despite the various advantages of existing warranty designs, these designs are still limited to inherent reliability and ignore the interaction between use reliability and regional difference. A new sub-region warranty differential pricing strategy based on the regional granularity of use reliability is proposed to solve these issues. A use reliabi...

Planners and designers of production systems must frequently evaluate the similarities in the manufacturing process of various products to achieve efficient and economical production. The purpose is to reasonably arrange mixed production. The similarity of manufacturing technique processes is an important basis for classifying product manufacturing...

Failure mode and effects analysis (FMEA) is a prospective risk assessment tool used to identify, assess, and eliminate potential failure modes (FMs) in various industries to improve security and reliability. However, the traditional FMEA method has been criticized for several shortcomings and even the improved FMEA methods based on predefined lingu...

Aiming at hardware product’s reliability step change during the phase switch process, this study analyzes the factors that affect the reliability step change from the structural and nonstructural factors of the manufacturing system. The evaluation index system and evaluation model of reliability step change based on catastrophe theory are establish...

Based on the systematic analysis of the factors which influence the warranty strategy and the business performance, a new regional warranty differential pricing strategy on the basis of operational reliability was proposed. A mathematical model reflecting the quantitative relationship between operational reliability and different geographical regio...

Based on the analysis of factors which influenced the operational reliability of Air Conditioning (AC), aiming at the minimum difference of operational reliability of AC in similar regions, a multivariable high-dimensional clustering model of operational reliability on the basis of working environmental factors and user habit factors was establishe...

Concurrent design is a systematic approach that aims to help developers consider all elements related to the product life cycle, including quality, cost, schedule and user requirement. This approach is challenging because designers conduct these elements manually in the design process. In addition, studies on the formation mechanism of design defec...

To research the influence of warranty period on business performance and to make the enterprise design a more scientific and reasonable warranty period, the interaction between maintenance strategy and enterprise business performance factors from two dimensions of technology and marketing was analyzed. By considering the continuous quality improvem...

Design defects do not only degrade the quality of products, but also overrun budgets, extend schedules, and even jeopardize the success of product development (PD). Defect propagation result in a high probability of defect occurrence. In this study, a novel weighted directed network model for defect propagation is proposed from the perspective of d...

With an aim to overcome low efficiency and improve the performance of fuzzy clustering, two novel fuzzy clustering algorithms based on improved self-adaptive cellular genetic algorithm (IDCGA) are proposed in this paper. The new dynamic crossover and entropy-based two-combination mutation operations are constructed to prevent the convergence of the...

With an aim to minimize the difference of use reliability of air conditioning (AC) systems in different regions, a clustering method for classifying regions based on factors of the reliability of AC systems is proposed. This study establishes a comprehensive evaluation model of regional clustering on the basis of analysis and investigation about th...

To overcome the shortages of traditional PFMEA which suffered heavy working load and more mistakes, the group evaluation approach was proposed on the basis of evidence theory. The evaluation dimension of risk factors, the corresponding converted coefficients and the corresponding complete sets of grade parts were determined. Various forms of expert...

The identification of potential process failure mode in multi-varieties and small-batch custom-built production and its effect evaluation were researched. The model of process elements was adopted to propose an innovative identification program and criteria of potential process failure mode. A multi-dimensional evaluation model based on principle o...

In view of the problem of generational product consistent form feature is difficult to be predicted quantitatively, this paper presents a novel approach based on grey theory, Back propagation neural network (BP NN) and Markov chain, which is hereafter called the improved Grey-BP model with Markov chain (IGMBPM model). In the process of forecasting,...

To objectively and accurately evaluate the risk of process failure mode, an evaluation method was proposed based on fuzzy theory and maximum entropy principle. The experts' opinions on three factors which were Severity(S), Occurrence (O) and Detection (D) of the failure were characterized by estimating interval, fuzzy factor and confidence coeffici...

To research the generation of design defect systematically and its developing process with design activity from perspective of design defect formation mechanism, based on the design activity of mechanical product design processes, the formation and development processes of design defect were researched by analyzing the types of design activity as w...

A rapid reliability evaluation method of LED lamp was proposed based on the acceleration degradation test. In order to evaluate the service life of lamps, the accelerated degradation test(ADT)was conducted under the integrated stress of temperature-electrical, and a general procedure for an accelerated degradation test was used to analyze the usefu...

The assessment on hardware design defects plays an important role in the product development process. In order to improve the design quality through mitigating design defects, a model for assessing hardware product design defects is developed in this paper based on the design defects formation mechanism of product. A novel assessment method by appl...