为研究管路系统中振动能量的传递规律，建立了2根半无限长管道结构的纵弯耦合振动模型，基于波分析法，分别研究了2根管道在各类不同的连接边界条件下，弯曲波振动传递规律。引入无量纲系数，简化方程组，推导出弯曲波入射时在不同边界条件下的反射及透射系数。通过数值分析得到了弯曲波入射条件下，参数变化对振动能量传递规律的影响，研究结果表明两管连接刚度主要影响高频振动，两管夹角主要影响低频振动，扭转刚度会使振动能量曲线产生波谷，且当扭转刚度值较低时，对低频振动影响较大，计算结果对管路结构在不同工况下连接参数的选择具有指导作用。
A longitudinal-bending coupled vibration model of two semi-infinite long pipelines is put out in this paper. Vibration energy transmission of two semi-infinite long pipelines is indicated by wave approach under different kinds of boundary conditions. Several non-dimensional coefficients are introduced to simplify the equations, and the reflection and transmission coefficients are derived. Through numerical analysis, the parameter change on the vibration energy transfer is obtained, under the bending wave incidence. The results show that the vibration energy transmission is mainly affected by connecting rigidity at high frequency, and mainly affected by the angle at low frequency, and the rotational rigidity will cause vibrational energy transmission curves to generate troughs and has influence at low frequency under low rotational rigidity, which can be useful to the selection of transmission shafts parameters.
2019,41(2): 56-60 收稿日期：2018-02-28
DOI：10.3404/j.issn.1672-7649.2019.02.011
分类号：U664.84
作者简介：李正阳(1993-),男,硕士研究生,主要从事结构减振降噪研究
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