Motion and Deformation Parameters Measuring of a Full-Scale Aircraft Propeller Blades by the Stereogrammetric Method

Aeronautical and Space-Rocket Engineering


Аuthors

Kulesh V. P.*, Kuruliuk K. A.**, Nonkin G. E.*, Senyuev I. V.*

Central Aerohydrodynamic Institute named after N.E. Zhukovsky (TsAGI), 1, Zhukovsky str., Zhukovsky, Moscow Region, 140180, Russia

*e-mail: mera@tsagi.ru
**e-mail: ksusha_kp_13@mail.ru

Abstract

The greatest share of units and machines in the aerial vehicle layout consists of rotating objects and mechanisms such as air and main rotors, compressors, turbines etc. While rotation, they are being subjected to the complex of inertial, aerodynamic and other kinds of loads, which leads to their shape changing, as well as kinematic, aerodynamic and strength properties. The possibilities of the aircraft normal functioning and safety are vanishing. Thus, parameters measuring of motion and deformation of the rotating objects elements is necessary.
Optical videogrammetry methods are indisputably the most prospective and suitable in realization for the rotating objects deformation measuring due to their distinctive merits such as contactlessness, inertialessness, high informativity and practically unlimited temporal and spatial resolution. Recently, optical methods of videogrammetry has been actively applied in wind tunnels, experimental test benches and real flights at TsAGI while aerodynamic and strength testing.
The main purpose of the presented work consists in developing and applying specialized two-channel videogrammetric system for the motion and deformation parameters measuring of aircraft propeller blades during full-scale ground testing at the airfield. The objectives of the work were the videogrammetry method adaptating to the specific object and testing conditions, calibration technique developing for the system by measuring low-speed propeller rotation, and motion and deformation parameters measuring of the propeller blades.
The article describes the videogrammetry method in the stereogrammetry variant, as well as contains the specifics of performing calibration and measurement results processing of motion parameters of the object with a large number of degrees of freedom. The authors solved the problem of the blade movement division into two components with parametric hypothesis application in the image convergence method. The propeller movement as a whole rigid body is separated from its own shape changes as the result of the elastic deformations. The article adduces the brief results of the detailed studies of motion and deformations of the propellers of both engines of the twin-engine passenger aircraft under conditions of the airdrome tests, and demonstrates the examples of the 3D panoramic shapes of both flapping and angular motion of the blades.

Keywords:

stereogrammetric measurements, non-contact optical methods, propeller blades deformation, non-contact measurements of rotating objects

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