不考虑内流影响的悬跨管道涡激振动模态分析
Vortex-Induced Vibration Modal Analysis of Free Spanning Pipelines without Considering the Effect of Internal Flow
DOI: 10.12677/IaE.2021.93012, PDF,   
作者: 徐学波：山东京博石油化工有限公司，山东 滨州；刘晓亮：山东滨化滨阳燃化有限公司，山东 滨州
关键词: 涡激振动；端部约束；悬跨长度；内压荷载；轴向受力；模态分析；Vortex-Induced Vibration； End Restraint； Span Length； Internal Pressure Load； Axial Force； Modal Analysis
摘要: 为了理清悬跨管道自振固有频率的影响因素，采用数值仿真方法开展悬跨管道涡激振动模态分析研究，研究了端部约束条件、悬跨长度、内压荷载、轴向受力条件对悬跨管道涡激振动模态的影响。结果表明：通过网格无关性验证及仿真结果实验验证，数值仿真得到的悬跨管道各阶模态自振频率结果是可靠的；悬跨长度对管道模态的影响以乘幂函数呈现，轴向力和端部约束条件对管道模态的影响以对数函数呈现；内压荷载对管道各阶自振频率的影响存在临界值，超过临界值自振频率快速升高；当轴向拉力不太高时，悬跨管道自振频率随轴向拉力呈现线性函数变化趋势，随着模态阶数的提高，线性函数变化的临界轴向拉力值变小；超过线性函数变化的临界轴向拉力值，曲线变化趋势不明显；悬跨管道自振频率随轴向拉力呈现线性函数的变化趋势。
Abstract: In order to clarify the influence factors of natural frequency of free vibration of free spanning pipeline, vortex-induced vibration modal analysis of free spanning pipeline was carried out by numerical simulation method, the effects of end restraint condition, span length, internal pressure load and axial force condition on vortex-induced vibration modes are studied. The results show that the numerical simulation results of the natural frequencies of each mode are reliable through the mesh-independent verification and the simulation experiment, and the influence of the length of the span on the modal is presented as a power function, the influence of the axial force and the end restraint conditions on the pipeline modes is presented as a logarithmic function; the influence of the internal pressure load on the natural frequencies of the pipeline has a critical value, and the natural frequencies increase rapidly beyond the critical value; the natural frequency of free vibration of free spanning pipeline presents a linear function change trend with the axial tension, the critical axial tension value of the linear function change decreases with the increase of the modal order, and the critical axial tension value of the linear function change exceeds the linear function change, the change trend of free vibration frequency of free spanning pipeline is linear function with the axial tension.
文章引用：徐学波, 刘晓亮. 不考虑内流影响的悬跨管道涡激振动模态分析[J]. 仪器与设备, 2021, 9(3): 74-81. https://doi.org/10.12677/IaE.2021.93012

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