Considering a semicoherent system made up of n components having i.i.d. continuous lifetimes, Samaniego defined its structural signature as the n-tuple whose k-th coordinate is the probability that the k-th component failure causes the system to fail. This n-tuple, which depends only on the structure of the system and not on the distribution of the component lifetimes, is a very useful tool in ...

Abstract: The paper presents an example of qualitative and quantitative application of a method for assessing component importance of a reliability structure in the case of a complex technical system based on the example of the subsystem of a marine power plant, that is, a lube oil system for sealing a stern tube. An example of the importance of the analysis considered in terms of not only reli...

This dissertation contains contributions to the management of optical transport networks. The focus is on traffic modeling, analysis of failure mechanism, and the development of a novel semi-automatic network management system. The developed service oriented traffic models serve as input parameters for the network management system and include the special routing of the analyzed services. An ev...

Measurement errors and other uncertainties place an interval of ambiguity around the mean value of system probability of failure and each path and component failure probability. Associated with a specified reliability R that a failure probability will lie within an interval is a confidence C in that reliability. The statement that the system probability of failure lies within a specified interv...

A reliable prognostics framework is essential to address failure mode mitigation and life cycle cost of aerospace systems. Metallic aircraft components are subject to a variety of inservice loading conditions and prediction of fatigue life remains a critical challenge. A hybrid prognostic model, which can accurately predict the crack growth regime and the residual useful life estimate (RULE) of...

Although our Readers, as well as ourselves, have just cause to be tired of the subject of this volume; yet while fever continues to ravage on the vitals of the community, arid men of experience to lay before their brethren the results of their observations, it is the duty of the Journalist to pourtray, and of the Reader to patiently audit, these records of passing events, in which all are more ...

Article history: Received 22 May 2015 Received in revised form 15 June 2015 Accepted 23 June 2015 Available online xxxx GaN-based LEDs often use polymermaterial as chip coating. The most used polymer coatings are siloxane-based materials such as poly(methyl-phenyl-silixane) – PMPS – or poly(dimethylsiloxane) — PDMS. Although their thermal properties offer great possibilities to justify their in...

Wafer-level testing of surface-micromachined sensors provides ncw challenges to the test community. Currently, there is no method available for performing direct measurements to assess faulty micromechanical structures. Most commercial methods use electrical measurements to deduce the physical source of failures in the micromechanical structure. As a result, the process of identifyang various f...

The paper analyses possible types, shapes and locations of defects in a life cycle according to such factors of a urea reactor as material, structure, manufacture approach, work environment, operating medium and failure mode. Then suitable nondestructive testing methods are chosen to test a urea reactor on service on the basis of characteristics of various nondestructive testing methods. And te...

Unscheduled boiler outages in process industries are a major problem resulting not only in expensive emergency repairs, but also loss of production. This paper draws on the experience of the author's company relating to common failures of pressure parts of boilers. The paper identifies the most common types of pressure part failure and the metallurgical mechanism involved. With a knowledge of t...