宁夏大学学报（自然科学版）2024，Vol.45Issue(3)：259-266,8.
L形输流管道三维振动固有特性研究
Research on Natural Characteristics of Three-Dimensional Vibration of L-shaped Pipe
摘要
Abstract
Fluid-conveying pipelines are crucial in various engineering fields for transporting media,and their vibration characteristics are a key focus for dynamics researchers.Due to the diversity of pipeline shapes,con-structing dynamic models for complex configurations is particularly important.This study employs the Absolute Nodal Coordinate Formulation(ANCF)to establish a three-dimensional dynamic model for pipelines and ana-lyzes an L-shaped pipeline with elastic supports at both ends as a case study.The system dynamic equations were derived using the generalized extended Lagrange equations.The modal results were validated using ANSYS software,and the effects of vertical and torsional spring stiffness,fluid velocity,structural parame-ters,and internal fluid filling rate on the natural frequencies were analyzed.The results indicate that increasing vertical and torsional stiffness enhances the natural frequencies,with vertical stiffness having a more significant impact.The inflection points of the low-order frequency curves appear earlier than those of the high-order fre-quencies.Increasing wall thickness,pipe diameter,and shortening pipe length significantly raise the natural fre-quencies and critical velocity.Changes in the filling rate do not significantly affect the natural frequencies at low flow velocities but significantly change the critical velocity.This study provides a reliable three-dimensional dynamic model for analyzing flow-induced vibrations in complex-structured pipelines.关键词
绝对节点坐标法(ANCF)/三维L形管道/弹性支撑/固有频率/临界流速Key words
absolute nodal coordinate formulation(ANCF)/three-dimensional L-shaped pipeline/elastic sup-ports/natural frequency/critical velocity分类
建筑与水利引用本文复制引用
郭宇辰,丁虎..L形输流管道三维振动固有特性研究[J].宁夏大学学报（自然科学版）,2024,45(3):259-266,8.基金项目
国家杰出青年科学基金资助项目(12025204) （12025204）
