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Static component of the temperature error of the strain-gauge balance: determination of the temperature sensitivity coeficient
https://doi.org/10.32446/0368-1025it.2021-10-8-13
Abstract
High precision strain gauge balances are used for the testing of the arcraft models in wind tunnels. The precision of the strain gauge balances depends on the balance temperature. The basic physical factors affecting the balance readings with temperature variation are reviewed and estimated. We considered the effect of static component of the temperature error on the readings of the strain gauge balance. A method of application of temperature corrections to the balance readings by means of the temperature sensitivity coefficient is described. We developed the method of determining coefficient of temperature sensitivity of balance components during a fulfilment of the test campaign in a wind tunnel. The experimental equipment and the experimental investigations carried out are described. The experimental results of determining the effect of the static temperature component on the readings of six-component balance are presented. Characteristic value of the sensitivity coefficient was found to be approximately 0.04 %/°C. It is shown that the standard deviation of the balance readings exceeds the balance calibration standard deviation when the balance temperature varies more than 3–4 °C. The temperature systematic error has to be excluded from results of the balance measurement in the form of correction to the sensitivity coefficient or electrical signal. The method was verified by the results of measurement of the weight of the aircraft model and the weight of the metric parts of the strain-gauge balance’s longitudinal and normal force components in the wind tunnel.
About the Authors
A. R. Gorbushin
Moscow Institute of Physics and Technology (National Research University);
Central Aerohydrodynamic Institute
Russian Federation
Russian Federation
Anton R. Gorbushin
Dolgoprudny, Moscow region
Zhukovsky, Moscow region
E. A. Krapivina
Central Aerohydrodynamic Institute
Russian Federation
Russian Federation
Ekaterina A. Krapivina
Zhukovsky, Moscow region
M. N. Tytyk
Central Aerohydrodynamic Institute
Russian Federation
Russian Federation
Marina N. Tytyk
Zhukovsky, Moscow region
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Review
For citations:
Gorbushin A.R., Krapivina E.A., Tytyk M.N. Static component of the temperature error of the strain-gauge balance: determination of the temperature sensitivity coeficient. Izmeritel`naya Tekhnika. 2021;(10):8-13. (In Russ.) https://doi.org/10.32446/0368-1025it.2021-10-8-13
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