Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: service lifetime

Sortuj według:

Ogranicz wyniki do:

A model for service life control of selected device systems

Zieja M., Ważny M.

Polish Maritime Research

2014

nr 2

45--49

This paper presents a way of determining distribution of limit state exceedence time by a diagnostic parameter which determines accuracy of maintaining zero state. For calculations it was assumed that the diagnostic parameter is deviation from nominal value (zero state). Change of deviation value occurs as a result of destructive processes which occur during service. For estimation of deviation increasing rate in probabilistic sense, was used a difference equation from which, after transformation, Fokker-Planck differential equation was obtained [4, 11]. A particular solution of the equation is deviation increasing rate density function which was used for determining exceedance probability of limit state. The so-determined probability was then used to determine density function of limit state exceedance time, by increasing deviation. Having at disposal the density function of limit state exceedance time one determined service life of a system of maladjustment. In the end, a numerical example based on operational data of selected aircraft [weapon] sights was presented. The elaborated method can be also applied to determining residual life of shipboard devices whose technical state is determined on the basis of analysis of values of diagnostic parameters.

Evaluation of service lifetime of avionic hydrostatic drives on the background of information acquired from the human-independent flight control devices

Ułanowicz L.

Journal of KONBiN

2006

No. 2

345--360

The paper discloses the method for evaluation of service lifetime of on board avionic hydrostatic drives on the background of information acquired from human independent flight control devices on the basis of description how the structural parameters of the system subject to alterations over the equipment lifetime. The description of structural parameters related to the hydrostatic drives takes advantage of these data from the human-independent flight control devices that have not been used so far and establishes correlation between these data and the measurement signals that are typical for the drives. Evaluation of the service lifetime employed by the presented method consists in comparison between the values for actual structural parameters and adequate threshold limits under provision that specific parameters affecting the process of predicted lifetime evaluation as well as describing the technical condition of the devices are mutually independent. Identification of structural parameters attributable to avionic hydrostatic drives was carried out on the basis of information that can be acquired from human-independent flight control devices. The theoretical backgrounds for the proposed method related to assessment of technical condition of an avionic hydrostatic drive and evaluation of its expected lifetime on the background of information acquired from the human-independent flight control devices are presented, as well as measurement data are listed whereas the data had been acquired from human-independent flight control devices and they refer to structural parameters of avionic hydrostatic drives for two types of aircrafts that are operated by Polish Air Forces.