GAS TURBINE ENGINE RESOURCE TESTS METHOD Russian patent published in 2019 - IPC G01M15/14 G01M13/00 

FIELD: engines.

SUBSTANCE: invention relates to aircraft engine building, namely, to aircraft gas turbine engines testing methods. Method of gas turbine engine resource tests involves splitting the working area of rotor rotation frequency with working blades into several ranges and operating time in each loading time range T, upon passage of which in the absence of damages on the working blades, a resource confirmation conclusion is made. For all working blades frequency of their natural oscillations is determined from first bending form f₁, and by the lowest natural oscillation frequency f_1min determining loading time T by relationship: , where N is normative loading base equal to 20⋅10⁶ cycles, then working area of rotor rpm for tested engine is divided into platforms with width of 0.4–0.5 % of minimum value of working area frequency, after that, at each site, time is worked out at time of loading T at average rotation frequency of rotor for this site.

EFFECT: invention increases reliability of confirming dynamic strength of rotor blades.

1 cl, 1 dwg