气力输送管道固有频率及共振分析

摘要

Pneumatic conveying pipeline is used to convey granular material, and the pipeline structure is de-signed according to the quantity of particles and time.Empirical formulas are used to get the gas column natural frequency and excitation frequency.It uses modal analysis ANSYS Workbench and theoretical calculation to cal-culate the natural frequency of the pipe and the fluid-structure interaction effect on the natural frequency of the pipeline structure.The results show that under the action of fluid-structure interaction, natural frequency of the pipe increases slightly, when the pipe length reaches a certain scope, pipelines, gas column or excitation source are in the resonance region.This provides a theoretical basis for the pipeline vibration analysis and structural de-sign of the pipeline.%利用气力输送管道输送颗粒状物质,根据输送颗粒量及时间设计出管道结构. 利用经验公式得到气柱固有频率及激振频率,用ANSYS Workbench进行模态分析和理论计算,得到管道的固有频率以及流固耦合对管道固有频率的影响. 结果表明,流固耦合作用下,管道固有频率稍有增大;当管道长度在某一范围内时,管道固有频率、气柱固有频率或激振源频率处于共振区. 研究结果为管道振动分析与管道结构设计提供了理论依据.