六分量大阻力复合式结构天平研制与应用

着陆巡视器和探月返回舱等短钝体风洞试验模型具有更大的阻力测量范围和更短的长度尺寸,为了提高该类模型在风 洞试验中的测量精准度,研制了一种新型复合式结构大阻力六分量应变天平。 与传统串联式结构天平相比,复合式结构天平结 构紧凑而阻力承载能力更强,能够完全安装于模型内部从而减少温度对天平测量精准度的影响;数值模拟结果表明,复合式结 构天平的平均应变、灵敏度、强度等能够满足风洞试验要求;复合式结构天平静态校准综合校准准度优于 0. 21%,满足国军标相 关技术指标。

Development of a six-component large axial force strain gauge balance based on complex structure

To improve the measurement accuracy in wind tunnel experiments for short blunt model which has larger axial force and shorter model length such as landing patrol device and lunar return cabin. A six-component large axial force strain gauge balance based on complex structure was developed. The complex structure balance was compact design and has larger axial force capacity compare with the conventional series structure balance, meanwhile, the complex structure balance could be installed in the model lumen completely to reduce the influence of temperature. The results of numerical simulation indicate that the mean strain, sensitivity and strength of complex structure balance meet the measurement requirements of the wind tunnel experiments. Calibration data show that the accuracy of the complex structure balance is less than 2. 1%, which satisfied the technical index of National Military Standard.