期刊文献+
共找到1,103篇文章
< 1 2 56 >
每页显示 20 50 100
Detection of Partial and Extended Blockages: A Case Study of Edible Oil Pipeline System
1
作者 Babatunde Victor Omidiji Ayodele Abeeb Daniyan +1 位作者 Adeniyi Taiwo Kunle Michael Oluwasegun 《Journal of Minerals and Materials Characterization and Engineering》 2024年第3期204-223,共20页
This work focuses on the development and implementation of a simulation-based approach for the detection of partial and extended blockages within an edible oil pipeline system. Blockages, whether partial or extended, ... This work focuses on the development and implementation of a simulation-based approach for the detection of partial and extended blockages within an edible oil pipeline system. Blockages, whether partial or extended, pose a significant operational and safety risks. This study employs computational fluid dynamics (CFD) simulations to model the flow behaviour of edible oil through pipeline under varying conditions. It leverages advanced computational fluid dynamics (CFD) simulations to analyze pressure, velocity, and temperature variations along the pipeline. By simulating scenarios with different blockage characteristics, there is establishment of distinctive patterns indicative of partial and extended obstructions. Through extensive analysis of simulation data, sensing element, and monitoring system, processing signal input and response output, the system can accurately pinpoint the location and severity of blockages, providing crucial insights for timely intervention. The detection system represents a significant advancement in pipeline monitoring technology, offering a proactive and accurate approach to identify blockages and mitigate potential risks and ensure the uninterrupted flow of edible oil, thereby enabling timely intervention and maintenance. 展开更多
关键词 Computational Fluid Dynamics (CFD) Simulations pipeline Blockages
下载PDF
Experimental Investigation and Optimization Design of Multi-Support Pipeline System 被引量:12
2
作者 Xiantao Zhang Wei Liu +1 位作者 Yamei Zhang Yujie Zhao 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2021年第2期135-149,共15页
The design of aircraft hydraulic pipeline system is limited by many factors,such as the integrity of aviation structure or narrow installation space,so the limited clamp support position should be considered.This pape... The design of aircraft hydraulic pipeline system is limited by many factors,such as the integrity of aviation structure or narrow installation space,so the limited clamp support position should be considered.This paper studied the frequency adjustment and dynamic responses reduction of the multi-support pipeline system through experiment and numerical simulation.To avoid the resonance of pipeline system,we proposed two different optimization programs,one was to avoid aero-engine working range,and another was to avoid aircraft hydraulic pump pulsation range.An optimization method was introduced in this paper to obtain the optimal clamp position.The experiments were introduced to validate the optimization results,and the theoretical optimization results can agree well with the test.With regard to avoiding the aero-engine vibration frequency,the test results revealed that the first natural frequency was far from the aero-engine vibration frequency.And the dynamic frequency sweep results showed that no resonance occurred on the pipeline in the engine vibration frequency range after optimization.Additionally,with regard to avoiding the pump vibration frequency,the test results revealed that natural frequencies have been adjusted and far from the pump vibration frequency.And the dynamic frequency sweep results showed that pipeline under optimal clamp position cannot lead to resonance.The sensitivity analysis results revealed the changing relationships between different clamp position and natural frequency.This study can provide helpful guidance on the analysis and design of practical aircraft pipeline. 展开更多
关键词 Multi-support pipeline system Clamp position optimization Frequency adjustment design Dynamic responses
下载PDF
Study of beat phenomenon on a pile-supported pipeline system subjected to wave loading
3
作者 孟珣 Huang Weiping Li Huajun 《High Technology Letters》 EI CAS 2007年第1期48-52,共5页
Classical beat phenomenon has been observed in most combined systems. The focus of this paper is to provide a better understanding of this phenomenon in an offshore pile-supported pipeline system. The beat phenomeon i... Classical beat phenomenon has been observed in most combined systems. The focus of this paper is to provide a better understanding of this phenomenon in an offshore pile-supported pipeline system. The beat phenomeon is caused by the coupling movement of the pipeline and its vertical pile support under certain conditions. It can induce excessive vibration and cause fatigue failure at pipe elbow. However, in some circumstances it does not exist. Numerical results in both frequency and time domains are presented to elucidate this phenomenon in a combined pipeline system. The conclusions of this paper could give constructive guidance to future design of simply supported pipeline systems. 展开更多
关键词 pipeline pile-supported pipeline system beat phenomenon pipe elbow wave loading time history analysis
下载PDF
State of art of seismic design and seismic hazard analysis for oil and gas pipeline system 被引量:4
4
作者 Aiwen Liu Kun Chen Jian Wu 《Earthquake Science》 CSCD 2010年第3期259-263,共5页
The purpose of this paper is to adopt the uniform confidence method in both water pipeline design and oil-gas pipeline design.Based on the importance of pipeline and consequence of its failure,oil and gas pipeline can... The purpose of this paper is to adopt the uniform confidence method in both water pipeline design and oil-gas pipeline design.Based on the importance of pipeline and consequence of its failure,oil and gas pipeline can be classified into three pipe classes,with exceeding probabilities over 50 years of 2%,5% and 10%,respectively.Performance-based design requires more information about ground motion,which should be obtained by evaluating seismic safety for pipeline engineering site.Different from a city's water pipeline network,the long-distance oil and gas pipeline system is a spatially linearly distributed system.For the uniform confidence of seismic safety,a long-distance oil and pipeline formed with pump stations and different-class pipe segments should be considered as a whole system when analyzing seismic risk.Considering the uncertainty of earthquake magnitude,the design-basis fault displacements corresponding to the different pipeline classes are proposed to improve deterministic seismic hazard analysis(DSHA).A new empirical relationship between the maximum fault displacement and the surface-wave magnitude is obtained with the supplemented earthquake data in East Asia.The estimation of fault displacement for a refined oil pipeline in Wenchuan MS8.0 earthquake is introduced as an example in this paper. 展开更多
关键词 seismic hazard assessment oil and gas pipeline fault displacement
下载PDF
Evaluation of the submarine debris-flow hazard risks to planned subsea pipeline systems: a case study in the Qiongdongnan Basin, South China Sea 被引量:1
5
作者 Mingquan Huang Xuesheng Qian +1 位作者 Jingping Xu Xuecheng Li 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2023年第5期139-153,共15页
The ever-increasing deepwater oil and gas development in the Qiongdongnan Basin,South China Sea has initiated the need to evaluate submarine debris-flow hazard risks to seafloor infrastructures.This paper presents a c... The ever-increasing deepwater oil and gas development in the Qiongdongnan Basin,South China Sea has initiated the need to evaluate submarine debris-flow hazard risks to seafloor infrastructures.This paper presents a case study on evaluating the debris-flow hazard risks to the planned pipeline systems in this region.We used a numerical model to perform simulations to support this quantitative evaluation.First,one relict failure interpreted across the development site was simulated.The back-analysis modeling was used to validate the applicability of the rheological parameters.Then,this model was applied to forecast the runout behaviors of future debris flows originating from the unstable upslope regions considered to be the most critical to the pipeline systems surrounding the Manifolds A and B.The model results showed that the potential debris-flow hazard risks rely on the location of structures and the selection of rheological parameters.For the Manifold B and connected pipeline systems,because of their remote distances away from unstable canyon flanks,the potential debris flows impose few risks.However,the pipeline systems around the Manifold A are exposed to significant hazard risks from future debris flows with selected rheological parameters.These results are beneficial for the design of a more resilient pipeline route in consideration of future debris-flow hazard risks. 展开更多
关键词 submarine debris flow pipeline MANIFOLD hazard evaluation route optimization Qiongdongnan Basin
下载PDF
Dynamic optimization analysis of hydraulic pipeline system based on a developed response surface method
6
作者 Hongquan QU Jianlin SUN +5 位作者 Xu YAN Yuanlin ZHANG Xuefeng LIU Tao YU HuaweiHAN Langjun XU 《Mechanical Engineering Science》 2020年第2期7-14,I0004,共9页
When designing a complex pipeline with long distance and multi-supports for offshore platform,it is necessary to analyze the vibration characteristics of the complex pipeline system to ensure that there is no harmful ... When designing a complex pipeline with long distance and multi-supports for offshore platform,it is necessary to analyze the vibration characteristics of the complex pipeline system to ensure that there is no harmful resonance in the working conditions.Therefore,the optimal layout of support is an effective method to reduce the vibration response of hydraulic pipeline system.In this paper,a developed dynamic optimization method for the complex pipeline is proposed to investigate the vibration characteristics of complex pipeline with multi-elastic supports.In this method,the Kriging response surface model between the support position and pipeline is established.The position of the clamp in the model is parameterized and the optimal solution of performance index is obtained by genetic algorithm.The number of clamps and the interval between clamps are considered as the constraints of layout optimization,and the optimization objective is the natural frequencies of pipeline.Taking a typical offshore pipeline as example to demonstrate the effectiveness of the proposed method,the results show that the vibration performance of the hydraulic pipeline system is distinctly improved by the optimization procedure,which can provide reasonable guidance for the design of complex hydraulic pipeline system. 展开更多
关键词 Hydraulic pipeline Multi-Support Response surface method Optimization analysis
下载PDF
A probabilistic estimation model for seismic physical portfolio loss of a water supply pipeline system
7
作者 Samantha Louise N.Jarder Osamu Maruyama Lessandro Estelito O.Garciano 《Resilient Cities and Structures》 2024年第1期44-54,共11页
Losses due to hazards are inevitable and numerical simulations for estimations are complex.This study proposes a model for estimating correlated seismic damages and losses of a water supply pipeline system as an alter... Losses due to hazards are inevitable and numerical simulations for estimations are complex.This study proposes a model for estimating correlated seismic damages and losses of a water supply pipeline system as an alternative for numerical simulations.The common approach in other research shows average damage spots per mesh estimated statistically independent to one another.Spatially distributed lifeline systems,such as water supply pipelines,are interconnected,and seismic spatial variability affects the damages across the region;thus,spatial correlation of damage spots is an important factor in target areas for portfolio loss estimation.Generally,simulations are used to estimate possible losses;however,these assume each damage behaves independently and uncorrelated.This paper assumed that damages per mesh behave in a Poisson distribution to avoid over-dispersion and eliminate negative losses in estimations.The purpose of this study is to obtain a probabilistic portfolio loss model of an extensive water supply area.The proposed model was compared to the numerical simulation data with the correlated Poisson distribution.The application of the Normal To Anything(NORTA)obtained correlations for Poisson Distributions.The proposed probabilistic portfolio loss model,based on the generalized linear model and central limit theory,estimated the possible losses,such as the Probable Maximum Loss(PML,90%non-exceedance)or Normal Expected Loss(NEL,50%non-exceedance).The proposed model can be used in other lifeline systems as well,though additional investigation is needed for confirmation.From the estimations,a seismic physical portfolio loss for the water supply system was presented.The portfolio was made to show possible outcomes for the system.The proposed method was tested and analyzed using an artificial field and a location-based scenario of a water supply pipeline system.This would aid in pre-disaster planning and would require only a few steps and time. 展开更多
关键词 Spatial correlation Probable maximum loss Risk management Water supply pipeline Portfolio loss estimation
下载PDF
Frequency-domain analysis of fluid-structure interaction in aircraft hydraulic pipeline systems: numerical and experimental studies
8
作者 Yang DENG Zongxia JIAO Yuanzhi XU 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2024年第8期605-617,共13页
The fluid-structure interaction(FSI)in aircraft hydraulic pipeline systems is of great concern because of the damage it causes.To accurately predict the vibration characteristic of long hydraulic pipelines with curved... The fluid-structure interaction(FSI)in aircraft hydraulic pipeline systems is of great concern because of the damage it causes.To accurately predict the vibration characteristic of long hydraulic pipelines with curved segments,we studied the frequency-domain modeling and solution method for FSI in these pipeline systems.Fourteen partial differential equations(PDEs)are utilized to model the pipeline FSI,considering both frequency-dependent friction and bending-flexibility modification.To address the numerical instability encountered by the traditional transfer matrix method(TMM)in solving relatively complex pipelines,an improved TMM is proposed for solving the PDEs in the frequency domain,based on the matrix-stacking strategy and matrix representation of boundary conditions.The proposed FSI model and improved solution method are validated by numerical cases and experiments.An experimental rig of a practical hydraulic system,consisting of an aircraft engine-driven pump,a Z-shaped aero-hydraulic pipeline,and a throttle valve,was constructed for testing.The magnitude ratio of acceleration to pressure is introduced to evaluate the theoretical and experimental results,which indicate that the proposed model and solution method are effective in practical applications.The methodology presented in this paper can be used as an efficient approach for the vibrational design of aircraft hydraulic pipeline systems. 展开更多
关键词 Fluid-structure interaction(FSI) Frequency-domain analysis Aircraft hydraulic pipeline pipeline vibration Transfer matrix method(TMM)
原文传递
Development of a Low-Cost Prototype System for Pipeline Operational and Vandalism Spillage Detection and Validation Framework
9
作者 Buloere Florence Ekeu-Wei Iguniwari Thomas Ekeu-Wei 《Advances in Internet of Things》 2024年第2期21-35,共15页
Crude oil spillage is a major challenge in Nigeria. It affects the environment, health, life, and livelihood of residents of the Niger Delta region, where oil is explored, processed, and transported via a network of p... Crude oil spillage is a major challenge in Nigeria. It affects the environment, health, life, and livelihood of residents of the Niger Delta region, where oil is explored, processed, and transported via a network of pipelines. Oil spillage is primarily caused by vandalization/sabotage and operational issues such as corrosion, equipment failure, operation, and maintenance errors. Thus, prompt response is required to mitigate the impact of oil spills. In this study, we deployed low-cost Arduino systems, including sensors (vibration and flow), modules (GPS and Wifi) and an IoT platform (ThingSpeak) to detect spillage caused by vandalism and operational inefficiencies proactively. The results demonstrate that low-cost sensors can detect changes in the flow volume between the inflow and outflow attributable to spillage, and vibration shocks caused by vandalism can be detected and linked to the cause of the spillage and communicated in real time to inform response action. Moreover, we proposed a framework for field validation utilizing KoboToolBox (a crowdsourcing/citizen science platform). The prototype system designed and programmed showed promising results, as it could detect spillage for vandalism and operational scenarios in real-time, quantify the volume of spillage, and identify the location and time of spillage occurrence;indicators relevant for response planning to minimize the impact of oil spillage. A video demonstration of the prototype system developed is accessible via: https://youtu.be/wKa9MZvYf1w. . 展开更多
关键词 Crude Oil LEAKAGE pipeline VANDALISM ARDUINO Crowdsourcing Niger Delta
下载PDF
Water hammer in the pump-rising pipeline system with an air chamber 被引量:12
10
作者 KIM Sang-Gyun LEE Kye-Bock KIM Kyung-Yup 《Journal of Hydrodynamics》 SCIE EI CSCD 2014年第6期960-964,共5页
Water hammer following the tripping of pumps can lead to overpressure and negative pressure. Reduction in overpressure and negative pressure may be necessary to avoid failure, to improve the efficiency of operation an... Water hammer following the tripping of pumps can lead to overpressure and negative pressure. Reduction in overpressure and negative pressure may be necessary to avoid failure, to improve the efficiency of operation and to avoid fatigue of system components. The field tests on the water hammer have been conducted on the pump rising pipeline system with an air chamber. The hydraulic transient was simulated using the method of characteristics. Minimizing the least squares problem representing the difference between the measured and predicted transient response in the system performs the calibration of the simulation program. Among the input variables used in the water hammer analysis, the polytropic exponent, the discharge coefficient and the wave speed were calibrated. The computer program developed in this study will be useful in designing the optimum parameters of an air chamber for the real pump pipeline system. The correct selection of air chamber size and the effect of the inner diameter of the orifice to minimize water hammer have been investigated by both field measurements and numerical modeling. 展开更多
关键词 air chamber design parameter field test pump pipeline system water hammer
原文传递
Thermo-Hydraulic Characteristics of Non-Isothermal Batch Transportation Pipeline System with Different Inlet Oil Temperature 被引量:3
11
作者 CHEN Zhimin YUAN Qing +2 位作者 JIANG Weixin LI Zongze YU Bo 《Journal of Thermal Science》 SCIE EI CAS CSCD 2023年第3期965-981,共17页
The batch transportation process of several kinds of crude oil is accomplished by an entire coupled pipeline system,which exhibits complex thermo-hydraulic characteristics.Based on the coupled characteristics among so... The batch transportation process of several kinds of crude oil is accomplished by an entire coupled pipeline system,which exhibits complex thermo-hydraulic characteristics.Based on the coupled characteristics among soil,pipelines and devices(including pumps,heating furnaces and valves),a coupled simulation model of batch transportation for the crude oil pipeline system is established,and a novel coupled simulation algorithm is proposed.The simulation results are in good agreement with the field data of an actual crude oil pipeline system.In addition,based on the numerical simulation,thermo-hydraulic characteristics of pipeline system are investigated,and some new thermo-hydraulic characteristics are obtained.In the batch transportation process with constant flowrate,the change trends of temperature at the outlet of each pipeline segment are hysteretic and the change ranges of temperature become small along mileage.And the adjustment of devices influences thermohydraulic characteristics to some extent.In the batch transportation process with variable flowrate,the complex thermo-hydraulic characteristics are exhibited,which are induced by the comprehensive influence of the changes of oil type,flowrate and absorbed/released heat.Compared with the transportation process with constant flowrate,the high-viscosity oil exhibits similar minimum temperature and lower maximum pressure in the transportation process with variable flowrate,which means that the higher transportation safety of pipeline system is obtained.This study can provide a scientific reference for making the safer batch transportation scheme of crude oil pipeline system. 展开更多
关键词 crude oil pipeline system batch transportation coupled simulation variable flowrate thermo-hydraulic characteristics
原文传递
A novel methodology for forecasting gas supply reliability of natural gas pipeline systems 被引量:1
12
作者 Feng CHEN Changchun WU 《Frontiers in Energy》 SCIE CSCD 2020年第2期213-223,共11页
In this paper,a novel systematic and integrated methodology to assess gas supply reliability is proposed based on the Monte Carlo method,statistical analysis,mathematical-probabilistic analysis,and hydraulic simulatio... In this paper,a novel systematic and integrated methodology to assess gas supply reliability is proposed based on the Monte Carlo method,statistical analysis,mathematical-probabilistic analysis,and hydraulic simulation.The method proposed has two stages.In the first stage,typical scenarios are determined.In the second stage,hydraulic simulation is conducted to calculate the flow rate in each typical scenario.The result of the gas pipeline system calculated is the average gas supply reliability in each typical scenario.To verify the feasibility,the method proposed is applied for a real natural gas pipelines network system.The comparison of the results calculated and the actual gas supply reliability based on the filed data in the evaluation period suggests the assessment results of the method proposed agree well with the filed data.Besides,the effect of different components on gas supply reliability is investigated,and the most critical component is identified.For example,the 48th unit is the most critical component for the SH terminal station,while the 119th typical scenario results in the most severe consequence which causes the loss of 175.61×10^4 m^3 gas when the 119th scenario happens.This paper provides a set of scientific and reasonable gas supply reliability indexes which can evaluate the gas supply reliability from two dimensions of quantity and time. 展开更多
关键词 natural gas pipeline system gas supply reliability evaluation index Monte Carlo method hydraulic simulation
原文传递
Solutions to improve the quality management of medical gas pipeline systems in China 被引量:1
13
作者 林硕 Hélène van den Brink +1 位作者 Eric Fouassier Alejandro Berardi 《Journal of Chinese Pharmaceutical Sciences》 CAS 2010年第3期169-176,共8页
Gases have long been used for medical applications across the world. Medical oxygen, one of the most important medical gases, has been widely applied both in hospitals and at home. It is defined as a drug and its pipe... Gases have long been used for medical applications across the world. Medical oxygen, one of the most important medical gases, has been widely applied both in hospitals and at home. It is defined as a drug and its pipeline distribution systems are medical devices whose quality and management should conform to specific standards. In China, several deficiencies relating to the distribution and use of medical oxygen, which may lead to a number of fatal accidents like gas pipeline explosion and cause illicit product use, have been revealed in health facilities. They are the result of a lack of the relevant standards, management and practical experiences. To overcome these failures, it might be interesting to refer to the experience and regulations of other countries, for example, those of France. 展开更多
关键词 Medical gas pipeline systems OXYGEN Standardisation QUALITY China
原文传递
THE FLOW CONTROL IN PIPELINE SYSTEM
14
作者 Xu Zu-xin(National Laboratory of Pollution Control and Resource Reuse, Tangji University Shanghai200092, P. R. China)R. Guercio(Department of Hydraulics, Transportaion and Highway, University of Rome, Rome00184, Italy) 《Journal of Hydrodynamics》 SCIE EI CSCD 1996年第4期49-55,共7页
An automatic control technique for the flow regulation in pipeline systems is developed in the paper. The improvement for the previous work is the use of an optimal observer that reduces greatly the time of changing n... An automatic control technique for the flow regulation in pipeline systems is developed in the paper. The improvement for the previous work is the use of an optimal observer that reduces greatly the time of changing now states and the adaptability for the regulation of frictioness now. By first order Taylor-expanding the frictioness flow equations of motion and continuity at equilibrium states, a set of linear equations are obtained then, the linear quadratic design technique in automatic control theory is used to control the now states. In order to avoid measuring all states, an optimal state estimator is constructed. A pipeline system is taken as example. The regulation results are satisfactory. If the changes of discharges are within 20%, the method developed in this paper is effective for valve-motion synthesis in real pipeline systems. 展开更多
关键词 automatic control flow regulation observer linear guadratic theory pipeline system
原文传递
Vibration analysis and control technologies of hydraulic pipeline system in aircraft:A review 被引量:43
15
作者 Peixin GAO Tao YU +2 位作者 Yuanlin ZHANG Jiao WANG Jingyu ZHAI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第4期83-114,共32页
Vibrations in aircraft hydraulic pipeline system,due to multi-source excitation of high fluid pressure fluctuation and serious vibration environment of airframe,can cause the pipeline system vibration failures through... Vibrations in aircraft hydraulic pipeline system,due to multi-source excitation of high fluid pressure fluctuation and serious vibration environment of airframe,can cause the pipeline system vibration failures through overload in engineering field.Controlling the vibrations in hydraulic pipeline is a challenging work to ensure the flight safety of aircraft.The common vibration control technologies have been demonstrated to be effective in typical structures such as aerospace structures,shipbuilding structures,marine offshore structures,motor structures,etc.However,there are few research literatures on vibration control strategies of aircraft hydraulic pipeline.Combining with the development trend of aircraft hydraulic pipeline system and the requirement of vibration control technologies,this paper provides a detailed review on the current vibration control technologies in hydraulic pipeline system.A review of the general approaches following the passive and active control technologies are presented,which are including optimal layout technique of pipeline and clamps,constrained layer damping technique,vibration absorber technique,hydraulic hose technique,optimal pump structure technique,and active vibration control technique of pipeline system.Finally,some suggestions for the application of vibration control technologies in engineering field are given. 展开更多
关键词 AIRCRAFT Hydraulic pipeline Vibration analysis Vibration control Vibration failure
原文传递
A dynamic modeling approach for nonlinear vibration analysis of the L-type pipeline system with clamps 被引量:12
16
作者 Qingdong CHAI Jin ZENG +2 位作者 Hui MA Kun LI Qingkai HAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第12期3253-3265,共13页
There exists a lot of research on the nonlinear vibration of the pipeline system with different boundary conditions.To the best of our knowledge,little research on the actual constraint of the clamp has been performed... There exists a lot of research on the nonlinear vibration of the pipeline system with different boundary conditions.To the best of our knowledge,little research on the actual constraint of the clamp has been performed.In this paper,according to hysteresis loops of the clamp obtained from experimental test,the simplified bilinear stiffness and damping model is proposed.Then the Finite Element(FE)model of L-type pipeline system with clamps is established using Timoshenko beam theory in combination with aforementioned stiffness-damping model.Both hammering and shaker tests verify the FE model via the comparisons of natural frequencies and vibration responses.The results show that the maximum errors of natural frequencies and vibration responses are about 8.31%and 17.6%,respectively.The proposed model can simulate the dynamic characteristics of the L-type pipeline system with clamps well,which is helpful to provide some guidance for the early design stage of pipeline in aero-engine. 展开更多
关键词 CLAMP Dynamic modeling Experimental test Finite element Nonlinear vibration pipeline
原文传递
Building Information Modeling-Based Secondary Development System for 3D Modeling of Underground Pipelines 被引量:3
17
作者 Jun Chen Rao Hu +1 位作者 Xianfeng Guo Feng Wu 《Computer Modeling in Engineering & Sciences》 SCIE EI 2020年第5期647-660,共14页
Underground pipeline networks constitute a major component of urban infrastructure,and thus,it is imperative to have an efficient mechanism to manage them.This study introduces a secondary development system to effici... Underground pipeline networks constitute a major component of urban infrastructure,and thus,it is imperative to have an efficient mechanism to manage them.This study introduces a secondary development system to efficiently model underground pipeline networks,using the building information modeling(BIM)-based software Revit.The system comprises separate pipe point and tubulation models.Using a Revit application programming interface(API),the spatial position and attribute data of the pipe points are extracted from a pipeline database,and the corresponding tubulation data are extracted from a tubulation database.Using the Family class in Revit API,the cluster in the self-built library of pipe point is inserted into the spatial location and the attribute data is added;in the same way,all pipeline instances in the pipeline system are created.The extension and localization of the model accelerated the modeling speed.The system was then used in a real construction project.The expansion of the model database and rapid modeling made the application of BIM technology in three-dimensional visualization of underground pipeline networks more convenient.Furthermore,it has applications in pipeline engineering construction and management. 展开更多
关键词 Building information modeling secondary development underground pipeline 3D modeling visualization.
下载PDF
WAVELET TRANSFORM THRESHOLD NOISE REDUCTION METHODS IN THE OIL PIPELINE LEAKAGE MONITORING AND POSITIONING SYSTEM 被引量:3
18
作者 Gao Chao Zhou Shanxue 《Journal of Electronics(China)》 2010年第3期405-411,共7页
This letter investigates the wavelet transform, as well as the principle and the method of the noise reduction based on wavelet transform, it chooses the threshold noise reduction, and discusses in detail the principl... This letter investigates the wavelet transform, as well as the principle and the method of the noise reduction based on wavelet transform, it chooses the threshold noise reduction, and discusses in detail the principles, features and design steps of the threshold method. Rigrsure, heursure, sqtwolog and minimization four kinds of threshold selection method are compared qualitatively, and quantitatively. The wavelet analysis toolbox of MATLAB helps to realize the computer simulation of the signal noise reduction. The graphics and calculated standard deviation of the various threshold noise reductions show that, when dealing with the actual pressure signal of the oil pipeline leakage, sqtwolog threshold selection method can effectively remove the noise. Aiming to the pressure signal of the oil pipeline leakage, the best choice is the wavelet threshold noise reduction with sqtwolog threshold. The leakage point is close to the actual position, with the relative error of less than 1%. 展开更多
关键词 Wavelet transform Decreasing-noise THRESHOLD Oil pipeline leakage MATLAB
下载PDF
Optimal design of the gas storage surface pipeline system with injection and withdrawal conditions 被引量:4
19
作者 Jun Zhou Liuling Zhou +4 位作者 Guangchuan Liang Shaobo Wang Tiantian Fu Xuan Zhou Jinghong Peng 《Petroleum》 CSCD 2021年第1期102-116,共15页
Underground natural gas storage(UNGS)is an important part of the natural gas supply system to ensure a balanced energy supply.The surface system,as an important part of the gas storage,undertakes the functions of gas ... Underground natural gas storage(UNGS)is an important part of the natural gas supply system to ensure a balanced energy supply.The surface system,as an important part of the gas storage,undertakes the functions of gas injection and gas production of the gas storage,and its investment economy is of vital importance.In fact,the UNGS surface pipeline network has two-way injection and production characteristics,which is different from the one-way production characteristics of conventional oil&gas gathering and transportation systems.This paper takes the minimum investment of the pipeline network as the objective function,considers the gas injection and gas withdrawal flow conditions and esablishes a mixed integer non-linear programming model(MINLP)for the surface pipeline network of the UNGS to optimize its pipeline layout and diameter parameters.Constraints including the well affiliation,the number of stations,the gathering radius,the processing capacity and the flow/pressure equilibrium equations,are also taken into consideration.Taking an UNGS in China as an example,the results of the optimal structure and diameter of the pipeline network,as well as the pipe flow,node pressure,and maximum/minimum flowrate during gas injection and gas withdrawal are obtained.Finally,the effects of constraints such as processing capacity and radius on the structure layout and investment of the UNGS are analyzed,verifying the reliability and effectiveness of the model. 展开更多
关键词 Optimal design pipeline network Natural gas storage Injection and withdrawal
原文传递
Vision-Based System of AUV for An Underwater Pipeline Tracker 被引量:2
20
作者 张铁栋 曾文静 +1 位作者 万磊 秦再白 《China Ocean Engineering》 SCIE EI 2012年第3期547-554,共8页
This paper describes a new framework for detection and tracking of underwater pipeline, which includes software system and hardware system. It is designed for vision system of AUV based on monocular CCD camera. First,... This paper describes a new framework for detection and tracking of underwater pipeline, which includes software system and hardware system. It is designed for vision system of AUV based on monocular CCD camera. First, the real-time data flow from image capture card is pre-processed and pipeline features are extracted for navigation. The region saturation degree is advanced to remove false edge point group after Sobel operation. An appropriate way is proposed to clear the disturbance around the peak point in the process of Hough transform. Second, the continuity of pipeline layout is taken into account to improve the efficiency of line extraction. Once the line information has lbeen obtained, the reference zone is predicted by Kalman filter. It denotes the possible appearance position of the pipeiine in the image. Kalman filter is used to estimate this position in next frame so that the information of pipeline of each frame can be known in advance. Results obtained on real optic vision data in tank experiment are displayed and discussed. They show that the proposed system can detect and track the underwater pipeline online, and is effective and feasible. 展开更多
关键词 A UV navigation pipeline detection Hough transform reference zone
下载PDF
上一页 1 2 56 下一页 到第
使用帮助 返回顶部