Modeling and verification of assembly angle error of force measuring components in vector thrust testing system
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摘要:
针对矢量推力测试系统中测力组件装配误差对测试精度影响机理未知问题，提出了测力组件转角误差影响规律分析建模方法。分析了转角误差主要影响的形变方向。构建了存在转角时的挠性件的局部解析形变模型，进一步获取了转角误差对于测力组件形变的影响规律。对挠性件与测力组件进行数值模型仿真分析。以转角为变量进行形变性能数值计算。开展挠性件及测力组件验证实验。对不同转角误差下结构性能进行了实验分析。通过理论分析、数值计算以及实验可以看出，装配转角误差对于结构形变性能影响很小，不同角度下性能误差最大仅为4.09%。表明在测力组件装配过程中转角误差可以忽略。该研究成果为简化测试装置装配过程提供了依据。
Abstract:To address the unknown influence mechanism of force component assembly error on test accuracy in the vector thrust testing system, a method for analyzing and modeling the influence rule of force component angle error was proposed. Firstly, the deformation direction mainly affected by the angle error was analyzed. Next, the local analytical deformation model for flexible parts was established to drive the influence law of the angular error on the force measuring components' deformations. The numerical model of the flexible part and the force measuring component was simulated and analyzed. The deformation was calculated with the angle of rotation as the variable. Angular errors on the structure’s mechanical properties were obtained. Finally, the verification experiments of flexible parts and force measuring components were carried out. The deformation properties under different angular errors were analyzed experimentally. Through theoretical analysis, numerical calculation, and experiment, it can be seen that the assembly angular error had little influence on the structural deformation performance. The maximum performance error at different angles was only 4.09%. It showed that the angular error between components can be ignored during the assembly of force measuring components. The research results provide a basis for simplifying the assembly process of the test device.
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Key words:
- vector engine /
- thrust test /
- force measuring component /
- assembly angle /
- error modeling
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图 2 测力组件3个方向变形图
Figure 2. Deformation diagram of force measuring components in three directions
图 3 测力组件侧向形变示意图
Figure 3. Schematic diagram of lateral deformation of force measuring component
图 5 测力组件中挠性件转角误差示意图
Figure 5. Angle error diagram of flexible part in force measuring component
图 7 不同转角下挠性件形变对比
Figure 7. Deformation comparison of flexible parts under different angles
图 8 测力组件转角下形变仿真
Figure 8. Simulation of deformation under rotation angle of force component
图 9 测力组件形变分解验证
Figure 9. Deformation decomposition verification of force measuring components
图 14 不同转角挠性件形变对比
Figure 14. Deformation comparison of flexible parts under different angles
图 16 测力组件转角性能实验
Figure 16. Performance experiment of force measuring component with angle
图 17 测力组件不同角度下局部形变
Figure 17. Local deformation of force measuring assembly at different angles
图 18 不同转角测力组件形变对比
Figure 18. Deformation comparison of force measuring components at different angles
表 1 挠性件形变计算值与实验值误差
Table 1. Error between calculated and experimental value of deformation of flexible part
力值/N 安装转角/（°） 0 15 30 45 60 75 90 100 1.53 3.52 0.59 0.55 2.24 3.42 1.53 200 1.33 1.87 1.01 1.50 0.46 0.92 0.31 300 0.71 1.36 1.12 2.14 0.31 0.56 0.65 400 0.94 1.08 1.19 2.49 0.03 0.06 1.71 500 1.63 0.91 1.24 2.70 0.16 0.34 0.82 
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表 2 不同力值下角度变化对挠性件形变影响
Table 2. Influence of angle change on deformation of flexible parts under different force values
力值/N 误差/% 力值/N 误差/% 100 4.08 400 3.48 200 3.32 500 3.52 300 3.43
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表 3 测力组件形变计算值与实验值误差
Table 3. Error between calculated and experimental value of deformation of force measuring components
β/（°） γ/（°） 输入力值/N 100 200 300 400 500 55.45 40.08 0.84 0.08 0.15 0.03 0.09 27.78 40.35 0.49 0.37 1.05 0.53 0.07 36.8 0 1.37 1.90 1.40 0.85 0.23 15.15 30.02 0.11 2.39 1.25 0.68 0.14 25.55 70.44 0.01 2.05 1.19 0.62 0.06
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表 4 不同力值下角度变化对测力组件形变影响
Table 4. Influence of angle change on deformation of force measuring components under different force values
力值/N 误差/% 力值/N 误差/% 100 2.20 400 0.88 200 2,41 500 0.23 300 1.40
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