| 朱文若,高忠信,陆力,王福军.离心泵叶轮水中固有频率经验下降系数分析及优化[J].水利学报,2013,44(12): |
| 离心泵叶轮水中固有频率经验下降系数分析及优化 |
| Analysis and optimization on natural frequencies depreciation coefficient of centrifugal pump impeller in water |
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| DOI： |
| 中文关键词: 流固耦合 模态分析 下降系数 离心泵叶轮 |
| 英文关键词: Fluid-structure interaction Modal analysis Depreciation coefficient Centrifugal impeller |
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| 中文摘要: |
| 在工程实际中，通常采用结构在空气中的自振频率乘以一个经验影响系数得出水中的自振频率，但是通过传统经验影响系数得出的结果与现实相比有很大的误差。本文选用能更加清楚表达水体对叶轮固有频率影响大小的下降系数进行研究。运用基于流固耦合的有限元方法对圆柱模型和两种离心泵叶轮进行模态计算，通过对结果的分析和比较发现：下降系数与结构的固有频率和振型有很大关系，采用分段取值更为合理，模态低阶取小值，高阶取大值，旋转振型取小值。最后对离心泵叶轮模型计算结果进行二次优化，得到更加符合实际的经验下降系数：模态前6阶除第3阶取0.05外，其余取0.15，第7—10阶取0.40。 |
| 英文摘要: |
| Normally，in real project，the natural frequency of a structure in water can be obtained by Natural frequency of the structure in air times an influence coefficient. However， there are big errors between the result obtained by traditional experience influence coefficients and realistic ones. For more clearly expressing the influence on structure by water， depreciation coefficient rather than influence coefficient was chosen to discuss. Finite element method based on the fluid-structure interaction was used in cylinder and impeller model analysis and a new set of experience depreciation coefficient was put forward. The results showed that depreciation coefficient has great relationship with natural frequency and vibration mode. It is reasonable to use segment value suggesting that the small value was applied in the low order level and rotation vibration mode， and the high value was applied in the high order. At last， secondary optimization was made in the calculation result of impeller model and the depreciation coefficients which are more consistent with realistic ones show that，in 1，2，4，5 and 6 order，the depreciation coefficient is 0.15; in 3 order， the depreciation coefficient is 0.05 and in 7， 8， 9 and 10 order， the depreciation coefficient is 0.40. |
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