Research on Vibration Fatigue of Pipeline Inspection Gauge Sealing Discs under Influences of Pipeline Defects

doi:10.3969/j.issn.1004-132X.2025.10.016

Abstract

Abstract:

When the pipeline inspection gauge was passing through defects， the vibrations and fatigue damages of sealing discs were intensified， affecting inspection reliability and leading to safety incidents. The ABAQUS software was used to investigate the interface contact vibration characteristics of sealing discs at defect locations within the pipeline， focusing on the intrinsic connections between the evolution of contact vibration behavior， the attenuation function， fatigue weak point locations， and fatigue life. The results show that the vibration processes of the sealing discs when passing through defects involve four stages： impact， deformation， near-elastic， and elastic. The dynamic stress amplitude of elastic vibration is found to follow an exponential decay pattern. The total number of vibrations is observed to increase with defect depth and friction coefficient， which is closely related to fatigue life. Fatigue weak points are concentrated at the contact points and the edges of the clamp， which is consistent with actual working conditions. The accuracy and feasibility of the proposed method are validated.

Key words: pipeline inspection gauge（PIG）, sealing disc, pipeline defect, vibration fatigue

摘要：

管道内检测器在经过管道缺陷时会加剧其密封盘的振动和疲劳损伤，影响检测可靠性并引发检测安全事故。借助ABAQUS软件研究了密封盘在管道内缺陷处的界面接触振动特性，重点探讨了接触振动的行为演化、衰减函数、疲劳脆弱点位置与疲劳寿命之间的内在联系。研究结果表明，密封盘经过管道缺陷时的振动过程包含碰撞、变形、近弹性和弹性4个阶段，其中弹性振动的动应力幅度呈指数衰减规律；总振动次数随管道缺陷深度和摩擦因数的增大而增大，且与疲劳寿命紧密相关；疲劳脆弱点集中在接触点和夹板边缘位置，与实际工况相符，验证了研究的准确性和可行性。

关键词: 管道内检测器, 密封盘, 管道内缺陷, 振动疲劳

CLC Number:

TE973.6

Xingyu WANG, Yanbao GUO, Zheng ZHANG, Zhangyu QIAO, Fa GAO, Jinzhong CHEN, Chang LIU. Research on Vibration Fatigue of Pipeline Inspection Gauge Sealing Discs under Influences of Pipeline Defects[J]. China Mechanical Engineering, 2025, 36(10): 2292-2299.

王星宇, 郭岩宝, 张政, 乔张宇, 高发, 陈金忠, 刘畅. 管道内缺陷影响下的内检测器密封盘振动疲劳研究[J]. 中国机械工程, 2025, 36(10): 2292-2299.

Figures/Tables 14

Tab.1 Element types and node numbers of simulation components

部件	单元类型	单元数量	节点数量
夹板	CAX4H；CAX3	509	553
直板	CAX4H	1124	1214
皮碗	CAX4H	780	848
管道	CAX4H；CAX3	3669	3807

Fig.1 Modeling of the sealing disc and pipeline

Fig.2 Schematic diagram of the simplified mechanical model for straight-plate motion

Tab.2 Material performance parameters

材料	密度/（kg·m^-3）	弹性模量 /GPa	泊松比
热塑性聚氨酯	1200
管道钢/夹板	7900	198.5	0.48

Tab.3 Parameters of the Ogden hyperelastic constitutive Model

参数	μ₁	μ₂	μ₃	α₁	α₂	α₃	D₁	D₂	D₃
值	36.27	8.58	$-$ 38.4	0.08	8.04	$-$ 0.69	0	0	0

Tab.3 Parameters of the Ogden hyperelastic constitutive Model

参数	μ₁	μ₂	μ₃	α₁	α₂	α₃	D₁	D₂	D₃
值	36.27	8.58	$-$ 38.4	0.08	8.04	$-$ 0.69	0	0	0

Fig.3 Contact pressure result contour of the sealing disc under the condition of μ =0.4， h =3.5 mm

Fig.4 Contact pressure vibration decomposition and fitting of the flat plate passing through pipeline defects under μ =4， h=3.5 mm conditions

Fig.5 Evolution of vibration behavior for the flat plate passing through pipeline defects under μ =4， h=3.5 mm conditions

Tab.4 Elastic fitting parameters of the flat plate traversing pipeline defects with varying depths

管道

缺陷

深度

h /mm

拟合

优度R²

峰

谷

数

3.5

-

-

0.3356

19.0

13.1

-

-

0.3421

19.1

13.2

-

1.9203

1.2876

0.849