Vibration response analysis of free-spanning pipeline based on inner pipe excitation signal

被引：1
|
作者：
Zhang, Hang [1 ]
Lu, Na [1 ]
Cui, Can [1 ]
Du, Shugiang [1 ,2 ]
机构：
[1] China Univ Petr, Coll Mech & Storage & Transportat Engn, Beijing 102249, Peoples R China
[2] CSIC Pride Nanjing Cryogen Technol Co Ltd, Nanjing, Jiangsu, Peoples R China
来源：
ADVANCES IN MECHANICAL ENGINEERING | 2018年 / 10卷 / 11期
基金：
中国国家自然科学基金;
关键词：
ANSYS; excitation signal; transient dynamic response analysis; free-spanning pipe; pipe-soil coupling; INTERACTION-MODEL; LEAKAGE;
D O I：
10.1177/1687814018814660
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Pipeline is important for gas transportation. Free span of buried pipeline may cause safety problem as a result of decreasing the load-carrying capacity of the pipeline. A method for detecting the free span of buried pipelines based on the inner pipe excitation signal was proposed. Vibration characteristics analysis of the pipe and its surrounding coupling system were discussed by means of the finite element method. A three-dimensional pipe model containing a free-spanning segment with a certain length was established. Transient dynamic response analysis was adopted. Frequency response function plots were generated to analyze the results of simulation. The effects of soil type, the length of the free-spanning segment, and the excitation signal on detection were studied. The results show that (1) the obvious change of the first natural frequency of the pipe with different surroundings can be used to detect the free-spanning segment of pipeline; (2) the harder the soil medium is, the higher the first natural frequency of the pipe and soil surrounding system will be; (3) the longer the length of the free-spanning segment is, the lower the first natural frequency will be.
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页数：9
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