考虑流体介质影响的管路模态特性分析

李继世; 张大义; 王立; 林丹; 洪杰

doi:10.13224/j.cnki.jasp.2019.03.019

考虑流体介质影响的管路模态特性分析

doi: 10.13224/j.cnki.jasp.2019.03.019

李继世¹,
张大义²,
王立³,
林丹⁴,
洪杰⁵

1.
北京航空航天大学能源与动力工程学院，北京 100191
2.
北京航空航天大学能源与动力工程学院，北京 100191；北京航空航天大学航空发动机结构强度北京市重点实验室，北京 100191
3.
中国航空发动机集团有限公司湖南动力机械研究所，湖南株洲 412002
4.
中国船舶工业集团有限公司系统工程研究院，北京 100036
5.
北京航空航天大学能源与动力工程学院，北京 100191；先进航空发动机协同创新中心，北京 100191

基金项目: 国家自然科学基金(11772022，51475021)

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出版历程
- 收稿日期: 2018-08-07
- 刊出日期: 2019-03-28

Modal characteristics analysis for pipelines considering influence of fluid medium

摘要

摘要: 针对航空发动机外部管路的动力学设计需求及湿模态特性求解问题。应用铁摩辛柯梁理论和能量法推导得到流体质量、压强、流速等综合影响下的管路湿模态振动方程，并基于软件ANSYS现有管单元，通过引入自定义附加刚度和阻尼单元建立了流体压强和流速影响项的等效方法，实现了考虑流体因素影响的管路模态特性计算。结果表明：流体压强引起的横向压力差会降低管路弯曲刚度，而压强引起的轴向张力会提高弯曲刚度，压强作用效果与管支点的轴向约束程度和管材泊松比有关。流体速度对管路湿模态影响与边界条件、振型和管路轴向伸长有关，在高流速时，模态频率可能为零，即出现屈曲失稳现象。
- 管路 /
- 航空发动机 /
- 湿模态 /
- 有限元 /
- ANSYS软件
Abstract: According to the requirement for the dynamic design of the external pipelines of aero-engine, and for solving the wet modal characteristics of complex pipelines, the Timoshenko beam theory and the energy method were used to derive the equation of the vibration of pipeline, in consideration of the effects of mass, pressure and velocity of fluid. Based on the existing pipe element in the ANSYS, an equivalent method to consider the pressure and velocity of fluid was established by using the stiffness and damping element, and it can be used in wet modal calculation of pipelines in ANSYS. Results showed that, the lateral force difference caused by the pressure of fluid could reduce the bending stiffness of the pipeline, and the axial tension caused by pressure could increase the bending stiffness; the effect of the pressure was related to the degree of axial constraint of the supports, and the Poissons ratio. The effect of the fluid velocity on the wet modal of the pipeline was related to the boundary conditions, the modes of vibration and the axial elongation of the pipeline. At high velocity, the modal frequency was zero, that was, the buckling instability occurring.
- pipeline /
- aero engine /
- wet modal /
- finite element method /
- ANSYS software

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