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In multiple attribute decision analysis (MADA) problems, one often needs to deal with assessment information with uncertainty. The evidential reasoning approach is one of the most effective methods to deal with such MADA problems. As a kernel of the evidential reasoning approach, an original evidential reasoning (ER) algorithm was firstly proposed by Yang et al, and later they modified the ER algorithm...
the increasing demand for light emitting diodes (LEDs) has been driven by a number of application categories. The construction of LEDs is somewhat similar to microelectronics, but there are functional requirements, materials, and interfaces in LEDs that make their failure modes and mechanisms unique. In this paper, the main failure modes and mechanisms of LED device and its driving module are investigated...
The structure design of ceramic package for packaging system in package is introduced in this paper. The reliability experiments of multi-layer ceramic package were simulated and analyzed by using the finite element method. We mainly studied the influence of the side size and sealing ring size on the reliability of the ceramic package structure, analyzed the stress and strain distribution of the ceramic...
A Multi-State System (MSS) is a mathematical model in reliability engineering that allows representing investigated system/object using several performance levels from perfect working to complete failure. A new approach for the analysis of a MSS based on mathematical methods of multiple-valued logic is proposed in this paper. In particular, the method for the calculation of critical system states...
The theory of belief functions is an effective tool to deal with the multiple uncertain information. In recent years, many evidence combination rules have been proposed in this framework, such as the conjunctive rule, the cautious rule, the PCR (Proportional Conflict Redistribution) rules and so on. These rules can be adopted for different types of sources. However, most of these rules are not applicable...
This presents a new model to support empirical failure probability estimation for a software-intensive system. The new element of the approach is that it combines the results of testing using a simulated hardware platform with results from testing on the real platform. This approach addresses a serious practical limitation of a technique known as statistical testing. This limitation will be called...
Modern electrical equipment of ships includes relatively sophisticated technical products, which are of great diversity in terms of both their functional purpose, and electrical power. Shipboard electrical equipment includes electrical power sources (generators, battery), the consumers electrical power (actuators, control systems, automation, lighting), and sewerage systems of electrical energy (electrical...
Gear box is a key component of wind turbine, its reliability improvement directly affects the reliability of the whole wind turbine. In this paper, two main failure modes of the wind turbine gear transmission system are analyzed based on the fault tree and Bayesian network. They are tooth surface contact fatigue pitting and tooth root bending fatigue fracture. The reliability index of the gear drive...
The fuzzy T — norms and T — conorms offer alternatives to compute the classical structural polynomial of a complex circuit. The reliability of a special complex 4-node circuit were evaluated, and it is show that, among a certain family of classic T — norms, the Frank T-norm provides a T — map emerging from the structural polynomial, which proves to be the best estimate for this reliability. Illustrative...
New device technologies such as spintronics, carbon nanotubes, and nanoscale CMOS incur random transient failures, where the failure probability is governed by the energy consumption through energy-failure functions. At the same time, there is growing use of deep neural networks for many inference applications, and specialized hardware is being developed with these nanotechnologies as physical substrates...
Radio-electronic means for various purposes are classified as complex systems and are characterized by a multilevel hierarchical structure in the form of separate units, blocks, and modules. As the system is influenced by a complex of factors in the process of operation, reliability of complex systems functioning depends on the reliability of the system elements and optimal distribution of reliability...
In order to evaluate the performance of smart electricity meter (SEM), this paper studies the reliability of the SEM. We introduce the indication of the reliability and analyze the standards and documents relevant to SEM. Then, we use the component stress method to predict the reliability of SEM based on the study of SEM. Finally, through an example, we obtain the expected failure rate of SEM from...
This paper develops a conversion function and method transforming from daily peak load curve used LOLED [days/year] to hourly load curve used LOLEH [hours/year] firstly. The indices can not only be conversed just arithmetically but also have different characteristics physically because of using their different load curves. The conversion function is formulated as variables of capacity and forced outage...
Wave energy is an important renewable source of electricity that can be exploited. The reliability is an important issue for these energy converters due to the fact that they must be installed in harsh environments. The paper presents a reliability analysis of the linear generator type wave energy converters and shows the impact of the environment on the components of these devices.
Large and complex equipment reliability evaluation is extremely dependent on equipment reliability experiment data, maintenance records, and failure data. With the informationalization and intellectualization of equipment (such as CNC machine tools, shield machines, and weaponry), large amounts of data (big data) will be produced during the equipment's operation. Abundant data provide a strong support...
A high-temperature gas-cooled reactor-pebble bed module (HTR-PM), as a demonstration nuclear power plant (NPP), is now under construction in the Shandong province of China. The reactor protection system (RPS) in an HTR-PM is a safety-related system and is mainly in charge of monitoring safety-related parameters according to the reactor protection requirements. Thus, an RPS is very important to operations...
This work focuses on a health-aware Model Predictive Control (MPC) scheme, which aims at enhancing the availability of the system. The objective is to extend the uptime of the system by delaying, as much as possible the system reliability decay. The weights of the MPC cost function are set according to some reliability importance measures. This work describes the main reliability importance measures...
A stochastic binary system is a mathematical model for reliability analysis. There is a logical function, called structure, that tells us whether the system survived or not after random failures on its components. The concept of duality in stochastic binary systems is here introduced. As corollary, the computational complexity of combinatorial problems from stochastic binary systems is fully characterized,...
Due to its advantages in terms of cost, size, weight, performance and availability, plastic encapsulated devices are used widely. However, the long-term reliability of plastic encapsulated devices is influenced by the internal connection failure between dies and lead frames, including first bond, second bond, bond wire and die-attach. The paper introduced five common failure mechanisms of internal...
Critical systems are systems that have direct effects on human health and life. Large production systems are an example of the critical system. Safety is a concept that is ubiquitous in our life but has never been clearly defined. A common confusion with safety is that safety is viewed to be the same as reliability. In this paper, we revisit the concept of safety and propose a new approach for design...
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