Article describes the features and specificity of the identification of fast moving objects, mainly vane of wind turbines and helicopter rotors. Non-contact determination methods of the point coordinates of various elements of rotating wind wheel are considered. New method and device for the high-precision determination of the deviations of multi-sectional vane of wind wheel developed elements are proposed.
Blade sections are freely mounted on the wheel axle with eccentricity, which allows them to self-align and remain in aerodynamic equilibrium under the influence of wind force, the resistance to rotation from the counter flow of air and the load on the shaft of the windmill. Device for measuring the deflection angles of the vane section as function of external forces includes a laser source of visible light able to movethe bunch vertically and to fix it on a tripod and laser reflectors. The last areinstalled on the sections surfaces, in front of the wheel rotating in the wind tunnel and screen with established measuring scale. It is located behind the laser source at a certain distance from the wheel. Passing the point of encounter with the laser beam, the reflectors guide it to the screen.Value of the beam deflection is proportional to the deflection angle of the vane element. Example of estimating the change in the elements positions for multi-section vane of new type wind turbine is considered depending on the wind speed and the load on the windmill shaft. To determine the accuracy of the proposed method for different angles of wedging of the vane elements the tests are conducted. It is established that the deflection of the laser beam on the screen does not exceed two percent of the computed value. Increasing the accuracy is possible by growing the distance between the light detector and the rotating wind wheel. The method developed by the authors for measuring the angular positions of quickly rotating vane allows determine the parameters of aerodynamic characteristics promptly and exactly as well as research the promising ways forgaining the power of wind turbines. The method can also be applied for testing helicopter propellers and vane.
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