Central Aerohydrodynamic Institute
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TsAGI’s development in metrology of aerodynamic models

30 May 2019

The key factor for the successful simulation study is the accuracy of the models’ manufacturing. To control this, the Zhukovsky Central AeroHydrodynamic Institute (TsAGI, a member of the National Research Center “Zhukovsky Institute”) measures the surface points of the models and their individual units using the Coordinate measuring machines (CMM).

Since there is a pattern model of the manufacturing surface in the form of a digital description, the CMM software defines the differences between the standard model and the measured points. To measure the discrepancy is generally sufficient to estimate the accuracy of mechanical engineering products. But this is insufficient for aircraft models. For their units, particularly with an aerodynamic roll forming (such as the wing, empennage, rotor blades, fan blades, etc.), one has to separately control the spanwise twist distribution, axis configuration, roll forming. Additionally, it is necessary to assess the assembling accuracy of the model and its setting into the wind tunnel. Specialists of TsAGI’s Research and Manufacturing complex developed an appropriate methodology for this.

“Basically it is the algorithm of the optimum most suitable superposition of the digital measurement and description,” explained Prokopy Nokolaev, one of the authors of the study. “The sequential comparison of the measurements with a digital description in general shows the way the model is installed in the wind tunnel’s axes. It is performed for each unit and determines the accuracy of the assembly. Superposing the measured surface coordinates allows to determine the geometrical distributed parameters (for example, wash and V-shape for wings) and the profiling.”

Vladimir Vermel, Maria Arkhangelskaya, Vladimir Zabaluev, Prokopy Nikolaev presented the study “Metrology of aerodynamic models, manufactured to provide the aircraft’s experimental working off” at the 15-th Moscow International Innovation Forum “Precision Measurements — the Basis of Quality and Safety” in the middle of May and received the approval of experts.

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