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Full Authority Digital Engine Control (FADEC) systems are widely used in commercial aircraft engines nowadays and system reliability has an important effect on the safety of aircraft operation. A reliability analysis framework is proposed in this study. Bayesian networks (BNs) are used to obtain the reliability function of the system which is able to analyze FADEC systems in the continuous time domain...
Due to the promotion of the globalization of environmental protection process, some high reliability requirements of electronic products have to be passive to the backward compatible soldering process. Compared to the traditional Sn-Pb soldering process, the backward compatible soldering process has to face with a smaller process window and a higher process implementation difficulty. In this paper,...
Based on hardware and software integration testing and model driven testing binding requirements, we propose a model based on the needs of embedded software driver initial framework to analyze and identify the needs of embedded systems hardware and software object creation object interaction model, then the model analysis and testing constraints and on the basis of test scenarios, and then establish...
This study analyzed the process of reliability assessment for a turbine-driven auxiliary feedwater (AFW) pump according to the date of a domestic nuclear power plant, starting from the onsite data collection up to the analysis of these data, and evaluation of the reliability parameter. The content includes scope and boundary definition of a turbine-driven AFW pump, reliability data collection and...
As new equipment development cycles are too long, there is an urgent need for comprehensive evaluation in the virtual prototype stage for equipment maintainability. This paper takes the characteristics of the design stage to construct a comprehensive evaluation index system, and puts forward subjective and objective weighting methods in a combination weighting method for an index of weights. Finally,...
Based on MCGS (Monitor and Control Generated System) software a training diagnosis system for a certain kind of equipment is designed and developed. Through analysis of the structure of the equipment composition and working principles of the process a two-dimensional simulation model is established. The model can achieve simple operation training. Using common equipment for fault modeling, a fault...
The Modified Condition Decision Coverage (MC/DC) test criterion is a mandatory requirement for the testing of avionics software as per the DO-178B standard. In the implementation of safety-critical software, there are many complex logics and testing requirements are relatively high. In structure-based testing, MC/DC coverage has a strong ability to detect errors compared to decision or condition coverage...
DC-DC converter is an electronic circuit that converts a source of direct current (DC) from one voltage level to another. It's widely used because of its short design period and high reliability. It is very important to evaluate technology readiness level (TRL) of DC-DC converter accurately. In this paper, Analytic hierarchy process (AHP) based evaluation method is proposed to calculate TRL value...
Wave soldering is one of the most widely used soldering methods in the electronics industry. However there are many influences that caused to soldering failure. This article presents a typical case about poor vertical fill failure analysis during wave soldering. Base on a series analysis, such as surface element detected, vertical cross section, thickness of inter-metallic compound (IMC) measurement,...
For structural system with multiple failure modes extensively present in engineering practice, two regional mode importance measures are proposed on the basis of the existing mode importance measures, i.e., the regional mode importance measure based on failure probability and the regional mode importance measure based on sample mean of output response. Compared with the existing global mode importance...
The reliability of electronic devices depends not only on the quality of components but also on the environmental condition, such as the humidity and the density of contaminants. For example, electrostatically enhanced dust deposition typically produces a dendritic deposit which induces a short circuit in adjacent conductors. In order to investigate contaminant deposition mechanisms on a printed circuit...
The mean cumulative function (MCF) characterizes the failure behavior of a repairable system. Typical model for modeling failure process is the power-law model. It is only applicable for the situations where the empirical MCF is concave or convex. In practical applications, the empirical MCF can be S-shaped. The intensity function associated with an S-shaped MCF is unimodal. The unimodal failure intensity...
A new method based on Dynamic Bayesian Network (DBN) is proposed to assess the car engine reliability because of the limitation that the existing reliability analysis methods can only be used in static system reliability assessment. Firstly, define the failure mode and effect analysis table (FMEA) and the failure rates of the main components of the car engine and construct Bayesian network (BN) model...
A defender protects a target from being attacked. It can carry out two kinds of strategies. One is passive defense strategy. The other is active defense strategy. When the defender executes the passive defense strategy, it can deploy camouflage to misinform the attacker. When the defender runs the active defense strategy, it strikes the attacker preventively. Then, the defender will reveals itself...
Large numbers of experiments have shown that grinding chatter is one of the major forms of host fault performance in grinding processes. In view of this, more advanced monitoring techniques are required to ensure the high reliability of grinders. The empirical mode decomposition (EMD) technique has shown promise for meeting this requirement. In general, EMD has been limited to processing one-dimensional...
Based on the analyses systems of fuzzy fault tree and event tree, this paper proposes a method for a reliability risk analysis to mitigate problems associated with risk modeling of fuzzy and uncertain information. Risk event occurrence probabilities were obtained with fuzzy linguistic variables instead of exact values used in fault tree analysis. Quantitative analysis was applied to the fuzzy fault...
Nowadays, railway systems are expected to have high reliability, availability, maintainability, and safety. Thousands of ZPW-2000A track circuits are in operation on the mainline and high-speed railway network in China. This paper presents a scheme for reliability assessment of ZPW-2000A track circuit using Bayesian network. First, a fault tree is built based on expert experience and failure investigation...
When it comes to the reliability allocation of Computerized Numerical Control (CNC) turrets, there are two problems. One problem is that the corresponding reliability index is only allocated into each subsystem; another problem is that neglecting the coordination between each subsystem will affect the results of reliability allocation. To solve these two problems a new research method for CNC turret...
With increasing critical business organizations focusing on the quality of service in cloud applications, high availability (HA) has become critical for the product level cluster of cloud applications. Existing availability evaluation methods or testing projects for cloud platforms, however, cannot sufficiently verify cluster tolerance to various reasonable environmental faults. This paper proposes...
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