METHOD OF AIRCRAFT ENGINE THRUST DETERMINING AT OPERATING MODE CHANGE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2016 - IPC G01L5/13 

FIELD: test equipment.

SUBSTANCE: invention relates to testing equipment and can be used for efficient aircraft engine thrust increment determination both in flight, and on ground. Method involves angle of attack and overload measurement along aircraft lengthwise axis and based on obtained measurements using constants, describing tested aircraft structure and aerodynamic characteristics, such as equivalent aircraft wing area S, engine axis angle of deviation from aircraft lengthwise axis φ_EN, a priori known input P_in0 and output P_out0 engine pulses, free fall acceleration g, aircraft weight m, and using least squares method, determination of efficient engine thrust increment. At that, process of determining is carried out during successively performed maneuvers, providing at engines operating mode change exemplary constant number M, height, angle of attack, that is consistency of flight parameters affecting engine thrust. Invention summary consists in fact that test mode is performed so, that from straight horizontal flight (SHF) stepped thrust control levers (TCL) deviation is performed, after which thrust change is compensated by flight path changing. In this case Mach number M and angle of attack remain approximately unchanged, height varies insignificantly (100…200 m), significantly changing are only effective thrust P_ef and output pulse P_out. Device implementing present method comprises angle of attack sensor, overloads transducer, squaring unit, two matrix formation units, three matrices multiplying units, matrix transposition unit, matrix reversing unit, error detection unit, two multipliers and four adders.

EFFECT: availability of data elements and corresponding links between them provides possibility of engine thrust increment determining with high accuracy without complicating design and engines operation process, while decreasing labor input amount during tests.

2 cl, 1 dwg