Wind tunnel test is an accurate measurement method of aerodynamic load.Aiming at the measurement characteristics of high frequency and multi-dimensional aerodynamic force in wind tunnel test,a box balance suitable for high frequency and six-dimensional aerodynamic force measurement in wind tunnel test is developed by using piezoelectric measuring elements.The theoretical output model between input and output is established according to the balance relationship between force and torque.Through force transfer relationship and finite element simulation,the passive output of the balance under the action of aerodynamic heat is analyzed.The performance index of the balance is obtained through the calibration test.The results show that the developed box balance can resist the temperature change interference in the test process in terms of structure and material.Temperature change influence coefficient is less than 0.5%.Its linearity and repeatability errors are lower than 0.4%and 0.5%respectively.The maximum mutual interference after decoupling is lower than 1.5%,and the three-way first-order natural frequency is higher than 3 000 Hz.It has excellent performance of high natural frequency and high precision.
关键词
风洞试验/高频多维气动力/压电盒式天平/气动热作用分析/标定实验
Key words
wind tunnel test/high frequency multi-dimensional aerodynamics/piezoelectric box balance/analysis of aerodynamic heat effect/calibration experiment
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