Effects of overload on the overturning behavior of metal diaphragm
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摘要:
为研究过载对金属隔膜翻转行为的影响，本研究采用仿真及试验验证的方法，深入探讨了过载作用下金属隔膜翻转过程中质心偏移的规律，并设计了一种能够控制质心偏移的筋结构隔膜。根据本文研究，可得出如下结论：当隔膜的轴线与过载方向一致时，隔膜的翻转弯边受到均匀背压，导致隔膜翻转至锥段处无显著偏心，但翻转至球段处则会出现质心偏移；而当隔膜的轴线与过载方向存在角度时，隔膜的翻转弯边受到的背压不均匀，导致隔膜翻转至锥段处便产生质心偏移，并且在翻转至球段处时质心偏移加剧，此外加速度值或角度的增加会导致隔膜质心偏移程度增大。与传统隔膜相比，筋结构隔膜通过筋结构提供的额外启动压力，能够有效地纠正过载排放过程中产生的质心偏移，从而展现了出色的质心控制性能。
Abstract:To study the effect of overload on the overturning behavior of metal diaphragm, the rule of centroid offset during the overturning process of metal diaphragm was deeply investigated by numerical simulations and experimental verification, and a stiffened-structure diaphragm which can control centroid offset was designed. According to the research in the study, the following conclusions can be drawn: when the axis of the diaphragm is consistent with the direction of overload, the turning edge of the diaphragm is subject to uniform back pressure, resulting in no significant centroid offset of the diaphragm when the diaphragm turns to the cone section, but a centroid offset will occur when it flips to the spherical section. When there is an angle between the axis of the diaphragm and the overload direction, the turning edge of the diaphragm is subjected to inconsistent back pressure, resulting in centroid offset of the diaphragm when the diaphragm flips to the cone section, and the centroid offset is further aggravated when it turns to the the spherical section. In addition, an increase in the acceleration value or angle will result in a greater degree of centroid offset for the diaphragm. Compared with the traditional diaphragm, the stiffened-structure diaphragm can correct centroid offset caused by the overload discharge through the additional initial pressure provided by its stiffened structure, thereby demonstrating superior centroid control capability.
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Key words:
- overload /
- metal diaphragm /
- overturning /
- centroid offset /
- stiffened-structure
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图 4 隔膜质心偏移要求及改进隔膜质心偏移设计（计算）
Figure 4. Requirement of centroid offset of diaphragm and the design value of centroid offset of improved diaphragm （calculation）
图 10 质心测试试验示意图（隔膜排放工装）
Figure 10. Schematic diagram of centroid test experiment （diaphragm discharge tool）
图 12 质心测试试验平台（隔膜排放工装）
Figure 12. Platform of centroid test experiment （diaphragm discharge tool）
图 13 不同加速度值下隔膜翻转过程中的顶点径向位移变化曲线（仿真）
Figure 13. Change of vertex radial displacement during the overturning process of the diaphragm with different acceleration values （simulation）
图 14 不同顶点轴向位移时隔膜翻转变形云图对比（加速度值为10g）
Figure 14. Comparison of overturning deformation contours at different vertex axial displacement （acceleration value is 10g）
图 15 不同角度下隔膜翻转过程中的顶点径向位移变化曲线（仿真）
Figure 15. Change of vertex radial displacement during the overturning process of the diaphragm with different angles （simulation）
图 16 金属隔膜受力分析图（隔膜轴线与过载方向一致时）
Figure 16. Stress analysis diagram of metal diaphragm （when the axis of the diaphragm is consistent with the direction of overload）
图 17 金属隔膜受力分析图（隔膜轴线与过载方向成夹角时）
Figure 17. Stress analysis diagram of metal diaphragm （when there is an angle between the axis of the diaphragm and the overload direction）
图 18 贮箱质心偏移-排放量曲线（试验）
Figure 18. Centroid offset - discharge value curve of tank （experiment）
图 20 隔膜质心偏移-排放量曲线（试验）
Figure 20. Centroid offset-discharge value curve of diaphragm （experiment）
图 21 翻转至第一根筋条位置隔膜质心偏移情况（受过载后隔膜）
Figure 21. Centroid offset of the diaphragm when it is turned over to the first rib position （diaphragm after overload）
图 22 翻转至第一根筋条位置隔膜状态（受过载后隔膜）
Figure 22. State of the diaphragm when it is turned over to the first rib position （diaphragm after overload）
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