Development of a single-fixed sheet hinge moment balance with axial force measurement
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摘要: 受大展弦比试验模型和天平结构条件限制，在高速风洞中采用传统结构的片式铰链力矩天平难以实现对操纵舵气动力的精确测量，其主要原因是传统片式铰链力矩天平无阻力测量单元，无法测量阻力，使得阻力对铰链力矩测量的干扰无法修正，同时传统结构的片式铰链力矩天平在试验中受机翼变形影响较大，影响试验数据精准度。针对这一问题，在中国空气动力研究与发展中心高速所开展了单固支带阻力元片式铰链力矩天平结构设计研究，并成功应用于某飞机模型舵面铰链力矩测力试验。校准数据以及试验结果表明，该天平能够有效测量阻力，基本消除了机翼变形对测量的影响，同时还可以减小附加力矩，增加天平载荷匹配性，有效提高试验数据质量。Abstract: Restricted by the condition of the test model and the wind tunnel balance structure, it's hard to measure the aerodynamic loads of the control flap accurately by using the normal sheet hinge moment balance. The main reason is there is no axial force measurement on the typical hinge moment balance, and therefore the interference due to the axial force can't be avoided. Moreover, The data quality of the balance measurement is depressed seriously due to the wing flexibility. To solve this problem, we put efforts to optimize the balance structure at the High Speed Aerodynamic Institution of CARDC. We designed a single-fixed sheet hinge moment balance with axial force measurement, which has been used in a certain airplane model hinge moment test successfully. The results of the balance calibration and the test data show that this balance can measure the axial force effectively, almost eliminate the influence of the wing flexibility, and increase the matching characteristic of the forces by decreasing additional moment. Using this type of hinge moment balance can increase the quality of the test data efficiently.
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Key words:
- hinge moment /
- wind tunnel balance /
- aspect ratio /
- axial force
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图 3 单固支铰链力矩天平安装示意图
Figure 3. Installation sketch of the single-fixed hinge moment balance
图 4 传统片式天平安装示意图
Figure 4. Installation sketch of the normal sheet hinge moment balance
图 6 单固支天平受机翼变形影响应变分析图
Figure 6. Strain analysis of the single-fixed hinge moment balance under wing flexibility influence
图 7 传统片式天平受机翼变形影响应变分析图
Figure 7. Strain analysis of the typical three-components hinge moment balance under wing flexibility influence
表 1 外置电桥修正对天平加载测值结果影响
Table 1. Influence of the balance calibration results by external bridge amend
右外副翼20°天平 加载误差 未修正 修正后 +Y 侧向力Y 14% 1% 方向 铰链力矩Mj 48% 0.2% 20kg 滚转力矩Mx 54% 5% -Y 侧向力Y 13% 1.5% 方向 铰链力矩Mj 51% 2% 20kg 滚转力矩Mx 44% 5% 
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表 2 天平设计载荷参数和静校结果
Table 2. Design parameters and static calibration results of the balance
项目 单元 法向力
Y铰链力矩
Mj滚转力矩
Mx轴向力
X设计载荷/(N, N·m) 560 19 14 240 平均应变/(10-6) 182 377 106 110 实际最大输出/mV 8.83 17.84 5.08 2.20 综合校准精度/% 0.03 0.03 0.03 0.03 综合校准准度/% 0.25 0.14 0.28 0.2 机翼上加载误差/% 0.3 0.18 0.32 --- 机翼变形对测量的影响/% 0.12 0 0.03 0
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