Parametric analysis of the higher-order modal correction factor C5 for pipeline vibration stress-velocity relationship
DONG Xiangxiang
GAO Hongbo
WANG Shuchang
LIN Lei
XU Decheng
ZHOU Shuai
Abstract：Vibration-induced fatigue failure in pipelines,which serve as critical fundamental components for fluid transport in heavy machinery and major technical equipment,presents a significant hazard to operational safety and stability.To enable accurate and efficient vibration assessment,existing criteria(such as the ASME OM3 standard)utilize a stress-velocity relationship.However,the higher-order modal correction factor(C5)within this relationship is difficult to obtain directly in engineering design and inspection,leading to a reliance on empirical values that lack conservative justification.To address this issue,this study performs a systematic modal analysis of single-span straight pipes based on the classic Euler-Bernoulli beam theory for structural vibration,combined with the traveling wave method.By conducting over fifty thousand parametric calculations covering variations in pipe length,diameter,wall thickness,and boundary constraints,the behavior of the C5 factor was investigated in depth.The results demonstrate that under the vast majority of working conditions,the C5value is highly concentrated around 1.0 and does not exceed a maximum of 1.11.Based on this statistical distribution,this paper proposes the unified adoption of a conservative value of C5=1.11 for the design and vibration assessment of pipelines in heavy equipment.This research provides a theoretical basis and data support for the vibration assessment and design optimization of pipeline components in major technical equipment,holding significant engineering value for enhancing equipment safety and reliability.
Keywords：vibrationstress-velocity relationshipASME OM3correction factor
Publication Date：2025-11-20
Online Publishing Date：2026-01-06(First online date of this platform, not the publication date of the document)
Pages：7( 49-55 )