热力耦合作用下的风洞应变天平校准技术

为研究温度对风洞应变天平测量的影响，以热力耦合作用下的天平校准技术为着力点，通过响应面实验设计方法确立热力耦合加载矩阵，基于六自由度校准系统及构建的温度环境对一台六分量风洞应变天平实施热力耦合加载，采用多元回归方法建立了包含温度、力、力矩参数的天平公式，最后利用验证载荷检验天平公式的准确性，检验结果显示：温度及力/力矩载荷作用下，天平各分量的综合加载误差优于0.3%;天平公式能准确表征天平在热力耦合作用下的综合性能。研究结果表明，热力耦合作用下的风洞应变天平校准技术能够用于评定及修正温度对天平测量的影响。

The calibration technology of wind tunnel strain-gage balance under the action of thermo-mechanical coupling

To study the influence of temperature on the measurement of wind tunnel strain-gage balance, the calibration technology under the action of thermo-mechanical coupling is taken as the focus of the research. The thermo-mechanical coupling loading matrix is established through the response surface experimental design method. The thermo-mechanical coupling loading is implemented on a six components wind tunnel strain-gage balance based on the six-degree of freedom calibration system and the constructed temperature environment. The balance formula including temperature, force and moment parameters is established by the multivariate regression method. Finally, the verification load is used to test the accuracy of the balance formula. Results show that the comprehensive loading error of each component of the balance is better than 0. 3% under the action of temperature, force and moment load. The balance formula can accurately characterize the comprehensive performance of the balance under the action of thermo-mechanical coupling. Results show that the calibration technology of wind tunnel strain-gage balance under the action of thermo-mechanical coupling can be used to evaluate and correct the influence of temperature on balance measurement.