| 小直径杆式应变天平轴向力元件设计问题的探讨 |
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| 引用本文： | 熊琳,宫建,王金印,刘训华,曾宪政.小直径杆式应变天平轴向力元件设计问题的探讨[J].气动实验与测量控制,2013(5):75-78. |
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| 作者姓名： | 熊琳 宫建 王金印 刘训华 曾宪政 |
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| 作者单位： | 中国航天空气动力技术研究院,北京100074 |
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| 摘 要： | 在小直径风洞中由于模型尺寸的限制,飞行器的全弹（箭）测力试验必须使用内置小直径杆式天平,其直径往往小于20mm。横向布置的轴向力元件显著降低了天平的局部刚度,致使轴向力元件的尺寸、相对位置和结构形式共同决定了干扰输出特性。在给出了FD-07风洞使用的两支Φ20mm杆式应变天平静校结果中的轴向力分量干扰输出情况后,通过有限元计算结果分析了造成两支天平轴向力单元干扰输出差别悬殊的原因,指出了真实边界条件对轴向力测量元件设计的显著影响。针对小直径杆式天平提出了降低轴向力单元干扰输出的既简单又有效的两种设计方法。
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| 关 键 词： | 天平 轴向力单元 干扰 有限元法 应力分析 |
Discussion about axial force element design of bending-beam strain-gauge balance with small diameter |
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| Authors: | XIONG Lin GONG Jian WANG Jin-yin LIU Xun-hua ZENG Xian zheng |
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| Institution: | (China Academy of Aerospace Aerodynamics, Beijing 100074, China) |
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| Abstract: | Only small diameter bending-beam strain-gauge balance（less thanΦ20mm）can be used in small wind tunnel because of the incapacious space in the model.Transverse arrangement of the axial force element reduces the local rigidity obviously.So the dimension,relative location and structural form determine the interaction output of axial component jointly,which may cause low accuracy of the measurement.The interaction output characteristics of twoΦ20mm balances used in theΦ0.5msupersonic wind tunnel in CAAA are presented.And the reasons of great difference between them are analyzed by means of finite element computation.Two design conceptions of how to restrain the interaction output of axial component are put forward. |
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| Keywords: | balance axial component interaction finite element method stress analysis |
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