水锤激励下黏弹性输流直管轴向振动响应特性

发布时间：2018-06-30 06:00

  本文选题：流固耦合 + 水锤　； 参考：《振动工程学报》2017年02期

【摘要】：针对水箱-管道-阀门系统,基于考虑了管壁黏滞作用的输流直管轴向振动流固耦合四方程模型,利用有限差分法和隐式欧拉法,配合牛顿-拉夫逊方法,研究弹性和黏弹性管道在水锤激励下的轴向耦合振动响应特性,对比分析了泊松耦合和连接耦合对管道振动响应特性的影响,并与前人的数值结果和实验成果对比,吻合良好。结果表明:两种耦合作用对管道轴向振动影响不容忽视;只考虑泊松耦合时,管内脉动压力水头增大明显,振动加快;同时考虑泊松耦合和连接耦合时,振动更加复杂,压力水头响应曲线更加不规则;黏弹性管道与弹性管道轴向振动响应特性差别明显,黏弹性管道脉动压力水头会随时间迅速衰减,且相位较弹性管道延迟,而弹性管道脉动压力水头无衰减趋势。
[Abstract]:Aiming at the water tank pipe valve system, based on the four equation model of fluid solid coupling in the axial vibration of a flow direct pipe, the finite difference method and the implicit Euler method are used to study the axial coupled vibration response characteristics of the elastic and viscoelastic pipes under the water hammer excitation, and the Poisson coupling is compared and analyzed. The effects of coupling and coupling on the vibration response characteristics of the pipeline are compared with the previous numerical results and experimental results. The results show that the effect of the two coupling effects on the axial vibration of the pipe can not be ignored. When the Poisson coupling is only considered, the vibration of the pressure water head in the tube is accelerated, and the Poisson coupling and connection coupling are considered at the same time. When the vibration is more complex and the response curve of the pressure head is more irregular, the response characteristic of the axial vibration of the viscoelastic pipe and the elastic pipe is distinctly different. The pressure water head of the viscoelastic pipe will decay rapidly with the time, and the phase is delayed more than the elastic pipe, and the pressure water head of the elastic pipe has no attenuation trend.
【作者单位】： 福州大学土木工程学院;台湾海洋大学河海工程系;
【基金】：国家自然科学基金资助项目(51679042)
【分类号】：TV134
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本文编号：2085222