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Reliability of Engineering Systems and Technological Risk von Rykov, Vladimir (eBook)

  • Erscheinungsdatum: 16.08.2016
  • Verlag: Wiley-ISTE
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Reliability of Engineering Systems and Technological Risk

In this book three main aspects are considered together: mathematical models for engineering systems reliability, the main concepts for technogeneous risk study, and insurance as methods for risks management. In the first part the author considers some special statistical problems concerning reliability data elaboration. The second part deals with the strong mathematical concept of risks and some problems for technogeneous risks insurance.


    Format: PDF
    Kopierschutz: AdobeDRM
    Seitenzahl: 100
    Erscheinungsdatum: 16.08.2016
    Sprache: Englisch
    ISBN: 9781119347415
    Verlag: Wiley-ISTE
    Größe: 2742 kBytes
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Reliability of Engineering Systems and Technological Risk

Reliability of Engineering Systems

1.1. Basic notions and characteristics of reliability

1.1.1. Basic notions

The notions described below correspond to the usual terminology used in reliability theory and most of the literature sources on reliability. Reliability theory deals with the following basic notions.

An object in reliability theory means a unit (an element or article), an apparatus, an engineering product and any system or its part at all, considering from the point of view of their reliability. Furthermore, the term unit is used for simple objects, which is considered a single entity. For complex objects, the term system is used and the term element means the minimal component of a system.

An exploitation of an object (unit or system) means the collection of all its existence phases (creation, transportation, storage, using, maintenance and repair).

Reliability of an object is its complex property, consisting of its possibility to fulfill assign to it functions under given exploitation conditions 1 .

According to the definition of Gnedenko [GNE 65], reliability theory is a scientific discipline about the requirements that should be used for projecting, producing, testing and exploitation of an object in order to get the maximal effect from its use. Reliability theory deals with such notions as: reliability, failure (breakdown), longevity, repair, repair-ability, etc.

Reliability means the possibility of an object to maintain its workability during a given time period under a given exploitation condition.

A failure is a partial or full loss of the object's workability. Therefore, we should distinguish full and partial failures.

In addition, failures are divided into sudden , for which the object suddenly (unexpected) loses its workability, gradual , for which the workability of an object is lost gradually (usually as a result of some physical parameters of the object going out of the admissible level) and halting (temporary loss of the workability).

Longevity is the ability of an object to be used for a long time under needed technical service.

Repair is the procedure that renews objects' reliability.

Repair-ability is the property of an object to predict, detect and remove its failures.

Safety is the property of an object (system, unit) not to allow situations that could be dangerous for people and the environment.

Further notions and definitions are introduced in the chapter if necessary.

Given the complex property of an object, the reliability is described by many different characteristics and indexes. Furthermore, the term characteristic is used for complex (functional) reliability characteristics, and the term index is usually used for numerical (simple) characteristics.

Among the different reliability characteristics, we first consider those that are used for units and systems which work up to the first failure.
1.1.2. Reliability of non-renewable units

In this section, the reliability of an object is studied independently of the reliability of its components as a single entity, and therefore instead of the term "object", here, the term "unit" is used. Suppose that the unit can be in only two states from the point of view of its reliability: "workable" (up) and not workable or "failure" (down). Denote by T the lifetime of the unit. It is a random variable (r.v.) and its basic characteristic is its cumulative distribution function (c.d.f.) that is the probability that this time is not greater than the fixed time t ,
Here and later, the symbol P {·} is used for the probability of the event in brac

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