在低噪声泵喷推进器设计中，要求静止和转动部件的固有频率相互避开以实现低噪声设计。本文基于FEM理论，对转子和复合材料定子导管组合体的干、湿模态固有频率进行数值研究和试验验证，分析定子导管组合体受内壁面激励产生的振动响应。转子前3阶干、湿模态固有频率数值误差小于5%；定子导管组合体前3阶干模态固有频率数值误差分别为2.8%、0.6%、19.2%，湿模态固有频率数值误差分别为9.5%、10.4%、45%；受内壁面单位载荷激励时，定子导管组合体沿传动轴的振动加速度级最大，较侧向大4.2 dB。为实现最佳减振效果，在减振设计中定子导管组合体的固有频率预报值应考虑10%误差以完全避开转子前3阶轴频和叶频，同时应考虑固有振型对轴向耦合振动的影响。
In the design of low noise pump jet propulsor (PJP), the natural frequencies of stationary and rotating components are required to avoid each other to achieve low noise design. Based on the FEM theory, this paper conducts numerical research and experimental verification of the dry and wet modal natural frequencies of the rotor and composite stator conduit assembly, and then analyzes the vibration response of the stator conduit assembly excited by the inner wall. The numerical error of the first three dry and wet modal natural frequencies of the rotor is less than 5%. The numerical errors of the first three dry mode natural frequencies of the stator are 2.8%, 0.6% and 19.2%, respectively, and the numerical errors of the wet mode natural frequencies are 9.5%, 10.4% and 45%, respectively. When excited by the unit load on the inner wall, the vibration acceleration level of the stator conduit assembly along the axial direction is the largest, 4.2 dB higher than the lateral direction. In order to achieve the best vibration reduction effect, a 10% error should be considered for the predicted natural frequency of the stator conduit assembly in the vibration reduction design to avoid the first three order shaft and blade frequencies of the rotor. At the same time, the influence of natural vibration mode on axial coupled vibration should be considered.
2025,47(7): 37-42 收稿日期：2024-5-25
DOI：10.3404/j.issn.1672-7649.2025.07.008
分类号：U664.3
基金项目：国家自然科学基金资助项目（U2341242）
作者简介：王仁智(1996-),男,硕士,工程师,研究方向为推进器设计
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