TECHNICAL MAINTENANCE EFFICIENCY OF THE AIRCRAFT MAINTENANCE-FREE ON-BOARD SYSTEM BETWEEN SCHEDULED MAINTENANCES

The avionics concept of the maintenance-free on-board equipment implies the absence of necessity to maintain onboard systems between scheduled maintenance, preserving the required operational and technical characteristics; it should be achieved by automatic diagnosis of the technical condition and the application of active means of ensuring a failsafe design, allowing to change the structure of the system to maintain its functions in case of failure. It is supposed that such equipment will reduce substantially and in the limit eliminate traditional maintenance of aircraft between scheduled maintenance, ensuring maximum readiness for use, along with improving safety. The paper proposes a methodology for evaluating the efficiency of maintenance-free between scheduled maintenance aircraft system with homogeneous redundancy. The excessive redundant elements allow the system to accumulate failures which are repaired during the routine maintenance. If the number of failures of any reserve is approaching a critical value, the recovery of the on-board system (elimination of all failures) is carried out between scheduled maintenance by conducting rescue and recovery operations. It is believed that service work leads to the elimination of all failures and completely updates the on-board system. The process of system operational status changes is described with the discrete-continuous model in the flight time. The average losses in the sorties and the average cost of operation are used as integrated efficiency indicators of system operation. For example, the evaluation of the operation efficiency of formalized on-board system with homogeneous redundancy demonstrates the efficiency of the proposed methodology and the possibility of its use while analyzing the efficiency of the maintenance-free operation equipment between scheduled periods. As well as a comparative analysis of maintenance-free operation efficiency of the on-board system with excessive redundancy and on-board system with rational redundancy serviced by the strategy of "to failure" is carried out.

1. Bukov V., Kutahov V., Bekkiev A. Avionics of Zero Maintenance Equipment. 27th Congress of the International Council of the Aeronautical Sciences 2010 (ICAS 2010), 2010, pp. 3507–3514.

2. Chernyshov V.A., Ovodenko A.A., Bukov V.N., Sheynin Y.E., Shulman V.A., Boblak I.V. Opyt sozdaniya tekhnologii proektirovaniya i proizvodstva informacionno-vychislitel'noj sredy dlya kompleksov aviacionnogo bortovogo oborudovaniya na osnove koncepcij integrirovannosti, modul'nosti i neobsluzhivaemosti [Creation of designing and producing technology for informationcalculating environment for airborne equipment package on basis of integrating, moduleness and zero maintenance conceptions]. Vestnik akademii voennih nauk [Bulletin of the Russian Academy of Military Sciences], 2012, № 3 (40), pp. 132–138. (in Russian)

3. Chuyanov G.A., Kos'yanchuk V.V., Sel'vesyuk N.I. Perspektivy razvitiya kompleksov bortovogo oborudovaniya na baze integrirovannoj modul'noj avioniki [Prospects of development of complex onboard equipment on the basis of integrated modular avionics]. Izvestiya YuFU Tehnicheskiye nauki [Izvestiya of Southern Federal University. Engineering science], 2013, № 3 (140), pp. 55–62. (in Russian)

4. Barzilovich E.Yu., Bukreev A.A., Parfenov V.P., Ostashkevich V.A. Ehkspluataciya aviacionnyh sistem po sostoyaniyu (matematicheskie modeli i tekhnicheskaya realizaciya) [Operation of aviation systems (mathematical models and technical realization)]. Nauchniy Vestnik Moscovskogo Gosudarstvennogo Tehnicheskogo Universiteta Grazhdanskoy Aviatsii [Scientific Bulletin of MSTUCA], 2008, № 127, pp. 7–15. (in Russian)

5. Kuznecov S.V. Matematicheskie modeli processov i sistem tekhnicheskoj ehkspluatacii bortovyh kompleksov i funkcional'nyh sistem avioniki [Mathematical models of processes and systems of technical maintenance of onboard systems and functional systems of avionics]. Nauchniy Vestnik Moscovskogo Gosudarstvennogo Tehnicheskogo Universiteta Grazhdanskoy Aviatsii [Scientific Bulletin of MSTUCA]. 2017, vol. 20, № 1, pp. 132–140 (in Russian)

6. Vojtovich A.V., Grigor'ev K.L., Shul'gin A.E. Matematicheskaya model' opredeleniya optimal'nyh periodov upravleniya tekhnicheskim sostoyaniem sredstv slozhnoj organizacionnotekhnicheskoj sistemy [A mathematical model for determining optimal periods of control the technical condition of means and technical system]. Fundamentalniye issledovaniya [Fundamental research], 2015, № 11-5, pp. 858–862. (in Russian)

7. Ulanskij V.V., Machalin I.A. Pokazateli ehffektivnosti ehkspluatacii rezervirovannyh aviacionnyh radioehlektronnyh sistemy [Effectiveness’ indicators of redundant aircraft electronic systems’ use]. Matematicheskiye mashiny i sistemy [Mathematical machines and systems], 2006, Vol. 1, № 4, pp. 155–163. (in Russian)

8. Wang H., Pham H. Reliability and optimal maintenance. New York, Springer, 2006, 360 p.

9. Vovk S.P., Ginis L.А. Modelling and forecasting of transitions between levels of hierarchies in Difficult formalized systems. European Researcher, 2012, Vol. (20), № 5-1, pp. 541–545.

10. Bronnikov A.M., Morozov D.V. Dinamika tekhnicheskogo sostoyaniya neobsluzhivaemoj v mezhreglamentnyj period bortovoj sistemy letatel'nogo apparata [Process of changes of maintenance-free onboard system operational status between scheduled maintenance]. Nauchniy Vestnik Moscovskogo Gosudarstvennogo Tehnicheskogo Universiteta Grazhdanskoy Aviatsii [Scientific Bulletin of MSTUCA], 2017, Vol. 20, № 1, pp. 152–158. (in Russian)

11. Bronnikov A.M., Kohovec S.N., Morozov D.V. Optimizaciya periodichnosti uglublennogo nazemnogo kontrolya aviacionnyh kompleksov po kriteriyu minimuma poter' v samo-letovyletah [Optimization of the periodicity of ground monitoring of airborne integrated systems according by using the test for minimum losses in aircraft flights]. Nauchniy Vestnik Moscovskogo Gosudarstvennogo Tehnicheskogo Universiteta Grazhdanskoy Aviatsii [Scientific Bulletin of MSTUCA], 2012, № 185, pp. 13–18. (in Russian)

12. Bronnikov A.M., Kohovec S.N. Optimizaciya periodichnosti nazemnogo kontrolya aviacionnyh navigacionnyh kompleksov po kriteriyu minimuma poter' v samoletovyletah [Optimization of the periodicity of ground monitoring of airborne integrated navigation systems by using the test for minimum losses in aircraft flights]. Kontrol’ Diagnostika [Control. Diagnosis], 2013, № 1, pp. 39–46. (in Russian)

13. ARP4761. Guidelines and Methods for Conducting the Safety Assessment Process on Civil Airborne Systems and Equipment. M.: Aviaizdat, 2011, 266 p.

14. Obolenskij Yu.G. Upravlenie poletom manevrennyh samoletov [Flight control of maneuverable aircraft]. М., Military publishing, 2007, 480 p. (in Russian)