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    Wyświetlanie 1-5 z 5
    Tytuł:
    Dynamic reliability evaluation of buried corroded pipeline under rockfall impact
    Autorzy:
    Wang, Yifei
    Xie, Mingjiang
    Su, Chun
    Powiązania:
    https://bibliotekanauki.pl/articles/2087010.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    buried pipeline
    rockfall impact
    finite element simulation
    dynamic reliability
    Opis:
    Load impact, such as the rockfall, may bring significant threats to the integrity management of pipeline. This study is intended to evaluate the reliability of buried pipeline under rockfall impact, and so as to reduce the possible failure and unnecessary downtime. Firstly, the dynamic response of the buried pipeline under load is analyzed by Euler Bernoulli foundation beam. After that, the process of rockfall impact on buried corroded pipeline is simulated with nonlinear finite element method. Furthermore, the influence of rockfall’s parameters (including rockfall mass, impact velocity, impact position, etc.) on the pipeline’s equivalent stress is quantitatively analyzed. Eventually, a time-varying reliability model is established to calculate the failure probability. The results indicate that the mass and velocity of the rockfall have obvious influence on the pipeline’s failure probability, and the change of impact’s position has small influence. The proposed method can provide a theoretical reference for the design and maintenance of buried pipeline.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 2; 275--288
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismic behavior of buried pipelines subjected to reverse fault moti
    Autorzy:
    Sabet, S. A.
    Nayyeri, S. M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/103033.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    finite element method
    reverse fault
    normal fault
    buried pipeline
    Opis:
    Network of buried pipelines is one of the critical elements in infrastructure of today's modern cities that cover large geographic distances. That is why they face a variety of natural hazards due to permanent ground replacements or wave emissions. Reports suggest that the main cause of damage to these lines is not seismic vibrations but large and permanent ground deformations are major causes of infrastructures' demolition. Most recent studies are related to lines crossing the strike-slip faults, and only a few researchers have tried to study the behavior of structures against the reverse fault. This article discusses the behavior and response of structures and infrastructures against the movements of reverse faults using the finite elements method. In this study, the interaction between soil-soil and soil-pipe has been considered in modeling terms. By using Abacus finite element analysis software version 6.11, pipe as shell element and the material behavior as elastoplastic as well as the soil around the pipeline as a continuous volumetric elements were designed and analyzed.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 30; 84-88
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect recognition of buried pipeline based on approximate entropy and variational mode decomposition
    Autorzy:
    Ju, Haiyang
    Wang, Xinhua
    Zhang, Tao
    Zhao, Yizhen
    Ullah, Zia
    Powiązania:
    https://bibliotekanauki.pl/articles/221572.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Buried Pipeline
    Defect Recognition
    Geomagnetic Anomaly Detection
    Variational Mode Decomposition
    Approximate Entropy
    Opis:
    The study aimed to examine the use of Geomagnetic Anomaly Detection (GAD) to locate the buried ferromagnetic pipeline defects without exposing them. However, the accuracy of GAD is limited by the background noise. In the present work, we propose an approximate entropy noise suppression (AENS) method based on Variational Mode Decomposition (VMD) for detection of pipeline defects. The proposed method is capable of reconstructing the magnetic field signals and extracting weak anomaly signals that are submerged in the background noise, which was employed to construct an effective detector of anomalous signals. The internal parameters of VMD were optimized by the Scale–Space algorithm, and their anti-noise performance was compared. The results show that the proposed method can remove the background noise in high-noise background geomagnetic field environments. Experiments were carried out in our laboratory and evaluation results of inspection data were analysed; the feasibility of GAD is validated when used in the application to detection of buried pipeline defects.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 4; 739-755
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of soil models in the thermodynamic analysis of a submarine pipeline buried in seabed sediments
    Autorzy:
    Magda, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259219.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    submarine buried pipeline
    seabed thermal models
    shape coefficient
    heat transfer coefficient
    longitudinal temperature profile
    Opis:
    This paper deals with mathematical modelling of a seabed layer in the thermodynamic analysis of a submarine pipeline buried in seabed sediments. The existing seabed soil models: a “soil ring” and a semi-infinite soil layer are discussed in a comparative analysis of the shape factor of a surrounding soil layer. The meaning of differences in the heat transfer coefficient of a soil layer is illustrated based on a computational example of the longitudinal temperaturę profile of a -kilometer long crude oil pipeline buried in seabed sediments.
    Źródło:
    Polish Maritime Research; 2017, 4; 124-130
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of induced voltage on buried pipeline from HV power lines using grasshopper algorithm (GOA)
    Autorzy:
    Bouallag, Khadidja
    Djekidel, Rabah
    Bessedik, Sid Ahmed
    Powiązania:
    https://bibliotekanauki.pl/articles/1840901.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    buried pipeline
    grasshopper optimization algorithm
    GOA
    HV power lines
    AC induced voltage
    rurociąg podziemny
    linie wysokich napięć
    napięcie indukowane
    Opis:
    The buried metallic pipeline which parallels to the HV power line is subject to induced voltages from the AC currents flowing in the conductors, these voltages can affect the operating personnel, pipeline associated equipment, and the pipeline integrity. This paper analyses the induced voltage and current on the buried pipeline running parallel to HV power lines. It also presents an optimization procedure of different parameters that affect the level of the induced voltage in the pipeline during normal operating conditions. A comparison study between the proposed optimization algorithms (GOA, GE, DE and PSO) is done with a maximization of a given objective function. The simulation results establish that the GOA algorithm provides a faster convergence and better solution than the other optimization algorithms. Thus, the statistical analysis according to Friedman’s rank test confirmed the superiority of this proposed algorithm. Furthermore, the results show that the parameters optimization of the metallic pipeline is an effective approach to provide the best performance for mitigation which is generally sufficient to reduce the induced voltage experienced by the buried metallic pipeline to enforce the safety limit.
    Źródło:
    Diagnostyka; 2021, 22, 2; 105-115
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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