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针对飞机复杂管路系统振动分析,提出了一种复杂空间管道系统流固耦合动力学模型,在模型中用梁单元对管道进行了离散,每个节点考虑了x、y、z这3个方向的平动以及绕x、y、z这3个方向的转动,共计6个自由度;在单元中考虑了流固耦合效应,计及了流体流速对管道振动的影响;建立了管道与基础、管道与管道间的弹性连接,以适应多个管道之间的耦合振动分析;模型采用Newmark-β数值积分法获取系统响应。针对实际液压试验台的空间管路系统,利用锤击法进行实验模态分析,将本文模型的仿真结果与实验结果和商用有限元软件ANSYS Workbench的计算结果进行了分析比较,验证了本文模型的正确性。最后,仿真计算了流固耦合作用下流速对管道系统固有频率的影响规律。
Aiming at the vibration analysis of complex pipeline system of aircraft, a fluid-solid coupling dynamics model of complex space pipeline system is proposed. In the model, the beam elements are used to discretize the pipeline. Each node considers the three directions of x, y and z Of the translation and the rotation around the three directions of x, y, z, a total of six degrees of freedom; in the unit to consider the fluid-structure coupling effect, taking into account the fluid flow velocity on the pipeline vibration; established the pipeline and the foundation, The flexible connection between pipe and pipeline can be used to analyze the coupling vibration among several pipelines. The model uses Newmark-β numerical integration method to obtain the system response. Aiming at the space pipeline system of actual hydraulic test rig, the experimental modal analysis by hammering method is carried out. The simulation results of this model are compared with the experimental results and the calculation results of commercial finite element software ANSYS Workbench. Correctness Finally, the influence of the flow velocity on the natural frequency of the pipeline system is calculated by simulation.