Academic Journal
BAROMETRIC ALTIMETER’S RELIABILITY CALCULATING METHOD
| Title: | BAROMETRIC ALTIMETER’S RELIABILITY CALCULATING METHOD |
|---|---|
| Source: | Information systems, mechanics and control; No. 9 (2013); 42-52 Информационные системы, механика и управление; № 9 (2013); 42-52 Інформаційні системи, механіка та керування; № 9 (2013); 42-52 |
| Publisher Information: | FASS, NTUU "Igor Sikorsky Kyiv Polytecnic Institute", 2013. |
| Publication Year: | 2013 |
| Subject Terms: | параметричний критерій відмови, frequency sensor, reliability, barometric altimeter, параметрический критерий отказа, частотний датчик, надійність, барометричний висотомір, надежность4 частотный датчик4 барометрический высотомер, parametric failure criterion |
| Description: | Frequency pressure sensor based barometric altimeter’s reliability largely depends on the efficiency of self-oscillating circuit frequency-dependent system of "mechanical resonator - excitation system oscillations," which at present are not effectively addressed. Development of methodology for calculating the reliability of such systems is relevant in terms of security and quality of technical objects and systems.The loss of stability of the system can be regarded as its rejection: an unstable system that is on the verge (aperiodic or oscillatory) stability is not workable: any slight deviation leads to its failure. If as a determinant parameter to consider its own oscillation frequency mechanical resonator (vibrating cylinder), then the change in frequency due to physical degradation of frequency-dependent system (aging, pollution, fatigue, wear, etc.) change the determining parameter in time will lead to reaching the limits of sustainability, i.e. the failure of the system. The problem of defining the boundaries of parametric stability in control theory solves the condition of parametric stability of the system.In terms of reliability, when finding the limits of parametric stability of the system considered in achieving this limit defining parameter system, consider the condition of parametric stability of automatic control systems for stationary systems, whose parameters may slowly change over time (by virtue of aging or other causes) that consider these systems as quasi-stationary or non-stationary. Also determine how this condition affects the reliability of the system.Scientific novelty of the work lies in the use of parametric failure criterion of robust stable systems, which combines the classic indicators of reliability of technical systems and the stability criteria for calculating the reliability of frequency-dependent automatic control systems, including barometric altimeters based pressure sensors with mechanical resonators.This criterion will also take into account the physical processes of degradation of the system during its operation the normalization adjusting next time (overhaul period duration).Using parametric failure criterion of robust stable systems allowed developing methodology for calculating barometric altimeters.The practical applicability. When analyzing the reliability of self-oscillating circuit frequency-dependent system of "mechanical resonator - excitation system oscillations' frequency barometric altimeter to use the proposed criterion, considering as a defining parameter own cylinder oscillation frequency mechanical resonator. To approximate mathematical model of frequency changes over time using a linear probability model physically change the natural frequency of a cylindrical cavity in time due to his physical degradation (thickening of the wall of the cylinder due to attached mass condensation and pollution working environment, change of elastic modulus due to fatigue and aging, etc.). Предлагается методика расчета надежности барометрического высотомера на основе робастного критерия отказа системы; критерий позволяет учитывать процессы физической деградации САК во время ее эксплуатации при нормировании времени следующего подрегулювания (длительности межремонтного периода) и рассчитывать время перехода САК от начала ее функционирования до момента потери параметрической (робастной) устойчивости, ограничивающей допустимое значение назначенного ресурса САК при ее проектировании. Пропонується методика розрахунку надійності барометричного висотоміра на основі робастного критерію відмови системи; критерій дозволяє враховувати процеси фізичної деградації САК під час її експлуатації при нормуванні часу наступного підрегулювання (тривалості міжремонтного періоду) і розраховувати час переходу САК з початку її функціонування до моменту втрати параметричної (робастної) стійкості, що обмежує допустиме значення призначеного ресурсу САК при її проектуванні. |
| Document Type: | Article |
| File Description: | application/pdf |
| Language: | Ukrainian |
| ISSN: | 2219-3804 2519-2256 |
| Access URL: | http://ismc.kpi.ua/article/view/54509 |
| Rights: | CC BY NC ND |
| Accession Number: | edsair.scientific.p..b9849078bae712d346e4489a7fc34ff3 |
| Database: | OpenAIRE |
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