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There are many linear consecutive connected systems with multi-phase missions, such as the modem water diversion system. In each phase, they can be treated as a linear consecutively-connected system (LCCS), and the whole system with multi-phase missions can be modelled as the phase mission linear consecutive connected system (PM-LCCS). With the development of bypass transportation system, every phase...
Military aircraft is a complex repairable system, reliability evaluation of it in the mission stage is a very complicated problem. A new method of reliability modeling in the mission stage is presented. Firstly, the mission-driven system reliability modeling process is analyzed based on topology and logic relationship of system reliability block diagram. Secondly, the system and components universal...
The use of Solid State Drives (SSDs) has been increased in storage systems due to high performance and low power consumption. However, some inherent properties of SSDs result in different behavior for SSDs in comparison with Hard Disk Drives (HDDs). As an inherent property, the Bit Error Rate (BER) of SSDs increases, when the number of Program/Erase (P/E) cycles arises. This increment leads to two...
Nowadays, the nuclear island and conventional island make use of sea water to cooling in most of nuclear power plant, in order to maintain the heat dynamic balance of nuclear power plant, and to protect the safety of nuclear power plants. As a result, the safety of the cold source system for nuclear power plant production and operation has a very important role. In this paper, by analyzing the threat...
In this paper we take one of the cutting edge algorithms for computing the all-terminal reliability and the k-terminal reliability of a network and use it to compute the reliability of a real life gas distribution network in the Netherlands. To do this we estimate network properties using industry knowledge and combine several different techniques to make the problem computable. This is the first...
Analysis of breath sounds for the purpose of diagnosing respiratory pathology is of great interest in recent years. In this paper, classification of normal, wheeze, rhonchi, line and coarse crackles using breath sound signal recording is performed using signal processing and machine learning tools. Breath sounds were filtered from noise and segmented into breath cycles followed by feature extraction...
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...
Extreme load value is a critical part in load spectrum compiling. To make a reliable spectrum to improve the reliability and durability of component, it is necessary to do research on extreme load. In this paper, the extreme value theory (EVT) is used to do extreme load value analysis with short time load spectrum to avoid the shortcoming of long traditional test time. The whole process of extreme...
High reliability Safety Instrumented Systems (SIS) in critical applications employ external or built-in testing to detect dangerous failures. In a nuclear power plant, typically, electromagnetic relays are used to communicate shutdown signals between various parts of safety instrumentation. Relay contact welding is a failure mode of concern. An online technique to diagnose this failure mode has already...
In order to analyze the effect of random vibration on the accuracy of disc magazine in tool changing process, dimensionless dynamics model of tool change system is established, using the model to study the random vibration of disc magazine in tool changing process. Through the study of peak beyond as basis failure criterion for evaluation of vibration reliability, a vibration reliability analysis...
This paper presents a semi-analytical simulation which combines analytical model and Monte Carlo technique to simulate the operation of discrete production lines. The purpose is to rapidly evaluate the availability for lines with unreliable machines and finite buffers in the design phase. Firstly, description of production line and availability definition are exhibited. Then, an output and inventory...
With the increasing role of software in every field, concern has grown over the quality of software products. One such measure of software quality is the reliability, which is the probability of failure-free operation of a computer program in a specified environment for a specified time. Prior to the release of software, failure data are obtained during testing, using which, future reliability of...
The operation system of oil tanker berthing and handling is complicated. Once oil spill accident occurs, consequences are beyond measure. The bosv-tie model is established to have a comprehensive analysis of the causes and consequences of the oil spill during the operation of tanker berthing and handling. The fault tree analysis is applied to analyze the risk factors associated with oil spill, while...
This article studies problems related to the control of inbound traffic in a given country. Its objective is to give a visibility on the inbound traffic. With this intention, we suggest an architecture allowing controlling the incoming calls effectively. The proof of the good working order of our system was made by the use of the servers linked with activation of CDR. Then, a monitoring interface...
Designing fault-tolerant systems implicates a redundant architecture of most critical system components. Traditional techniques — DMR and TMR, require a compromise with either incapability of a failed system masking or with an extremely high complexity and voter discrepancy. This paper presents a novel, warm redundancy architecture on FPGA based on a 32-bit microcontroller, which eliminates the drawbacks...
Mobile devices such as smartphones and tablets have become an integral part of a person's life. These portable devices opened up a new software market for mobile application development resulting in various applications from healthcare, banking till entertainment. Therefore, there is a need for mobile applications to be reliable and maintainable. In this paper we introduce an equivalent class based...
Every machine has mechanical moving parts in recent generate internal stresses in its structure. These efforts are manifested by the vibration of the whole structure of the machine. For the collection of data necessary to analyze the origin of these efforts are often used vibration sensors, whose function is to transform mechanical energy into a proportionate and measurable electrical signal. In the...
BI (Business Intelligence) is an important discipline for companies and the challenges it faces are strategic. A central concept in BI is the data warehouse, which is a set of consolidated data from heterogeneous sources (usually databases in 3NF). To model the data warehouse, the Inmon and Kimball approaches are the most used. Both solutions monopolize the BI market However, a third modeling approach...
This paper focuses on design analysis issues of direct driven permanent magnet synchronous generator (DDPMSG) which are widely used in large scale wind turbines. The permanent magnet synchronous generator (PMSG) of 1.5 MW output power which is driven directly without gear system is analyzed by Maxwell 2D RMxprt. The characteristics of generator include the cogging torque, induced coil voltages at...
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