METHOD OF DETERMINING STATIC AND OSCILLATORY AERODYNAMIC DERIVATIVES OF MODELS OF AIRCRAFTS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC G01M9/00 

FIELD: aviation.

SUBSTANCE: testing is carried out both in the flow and without flow in the aerodynamic tunnel, the model by strain-gage weighers and holders are mounted in the movable support device, the model is oscillated with a fixed frequency and small amplitude alternatively about axes Ox, Oy and Oz. Then the load acting on the model is measured in time, and its angular position, the inertia and weight loads are subtracted, in the process of testing the model together with the holder and the strain-gage weighers are turned by fixed angles of heel, the experimental results with fluctuations relative to the axes Oy and Oz are treated together. The device comprises a turning table in the working part of the aerodynamic tunnel, the stand on the turning table, the movable L-shaped frame, the holder of the model with strain-gage weighers, mounted in the bearing assembly of the frame, the connected by rods with the frame and the holders, the sensors of the frame rotation angle and the holders. The holder is made with the ability of remotely controlled unit at a predetermined angle of heel using the mechanism consisting of a housing mounted on the bearing assembly of the frame coaxially to the holder by means of bearings, the electric gear motor, the output shaft with elastic drive-pinion connected to the free end of the holder, the pneumatic brake of the disc, the additional sensor of the mounting angle of the holder in roll, which is spaced from the axis of the holder and is connected to the drive-pinion, outside the housing is provided with a lever-clip for fixing mechanism relative to the frame and for connection by the rod with the drive.

EFFECT: increasing the capabilities of determining static and oscillatory aerodynamic derivatives of aircraft models in the aerodynamic tunnel in the presence of slip angle in the whole range of angles of attack.

2 cl, 7 dwg