Shimanovskaya N. Formation of the models of thermal and stress condition of details for the multimode airplane engines lifetime monitoring systems

The object of research is aircraft gas turbine engine; the objective of the research is enhancement of integrity and accuracy of control over multiple-mode aircraft engines resource based on identification of temperature and stress condition dynamics of main parts. Research methods: methods of dynamics of systems in the space of conditions, finite-element approximation and analysis of thermostressed condition of parts, nonparametric and parametric identification. Obtained scientific results allow to create program complexes of operational monitoring of temperature and stress condition of parts for systems of monitoring of aircraft engines resource. Scientific novelty: for the first time analytical dependences were obtained that connect inaccuracy of resource monitoring of a part to inaccuracies of monitoring models of its temperature and stress condition within two concepts of engine operation - without damage and with admissible damage level of main parts; for the first time analytical dependence was obtained that describes asymptotic similarity of transition characteristics of temperature and stress condition of parts; new monitoring models of temperature and temperature stress dynamics in a part were introduced, based on displaying their transition characteristics with exponential series with coefficients dependent on heat exchange conditions; new method of temperature and stress condition of parts identification according to high level models was introduced, which consists in serial estimation of coefficients of exponential series in areas with different number of significant exponents. Implied: accuracy requirements for temperature and stress condition; temperature and stress condition monitoring models. Efficiency: industrial. Application: aviation propulsion engineering.