METHOD TO DETERMINE AERODYNAMIC COEFFICIENTS C AND C BASED ON DETECTION OF TOTAL TRACTION OF PROPULSION DEVICE ACCORDING TO RESULTS OF FLIGHT TESTS OF AIRCRAFT Russian patent published in 2014 - IPC G01M17/10 

FIELD: testing equipment.

SUBSTANCE: on the basis of using the methodology of previous detection of total traction of a propulsion device (PD) according to the results of the flight tests (FT) of the aircraft (AC) they determine aerodynamic coefficients C_x and C_y. This is achieved by building a system of measurements and processing of their results, which makes it possible to separate the force of traction and aerodynamic force according to the "physical" principle and organise the iteration process of measurement results processing. For this purpose in process of flight they measure overloads n_x1 and n_y1 to connected axes ox₁ and oy₁. Using the specified aerodynamic coefficients C_x and C_y they calculate the continuously changing angle of inclination of the auxiliary axis, in direction of which the AC is exposed to overload only from the traction force provided that the projection of the vector of total aerodynamic force is equal to zero. Using the measured values of the overload n_x1 and n_y1 to connected axes ox₁ and oy₁ they calculate the overload value, which depends only on the PD traction force. The aerodynamic components of the overload are corrected due to the iteration process according to the overload with account of the confirmed values of sought for values P, C_x, C_y.

EFFECT: increased accuracy of detection of total traction of a PD and aerodynamic coefficients C_x and C_y.

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