DYNAMIC STABILITY OF PIPELINE WITH CONCENTRATED DAMPERS

2021 ◽  
pp. 73-77
Author(s):  
D. LOLOV ◽  
◽  
S. LILKOVA-MARKOVA ◽  
V. I. BALABANOV
Keyword(s):  
Galerkin Method ◽  
Dynamic Behavior ◽  
Oil And Gas ◽  
Pipeline System ◽  
Theoretical Studies ◽  
Common Elements ◽  
Spectral Galerkin Method ◽  
The Subject ◽  
Concentrated Masses ◽  
The Stability

The article indicates that pipes with a liquid fl owing through them are one of the most common elements in various fields of industry. Pipelines in oil and gas and a number of other industries have valves and connections that can be modeled as concentrated masses. It is very important to consider their impact when investigating the dynamic behavior of pipelines. Developing fluctuations are the subject of research by many scientists. The article investigates a pipe with a static scheme of a beam freely lying on the supports with concentrated dampers. The stability of the system consisting of a pipe with concentrated dampers and a liquid fl owing through it is investigated. The spectral Galerkin method is used to determine the critical fl uid velocity. On the basis of theoretical studies, it has been established that a pipeline system with dampers loses its stability at 1.26 times lower fl uid fl ow rate (Vav = 122. 67, m/s) than in the case without dampers (Vav = 155 m/s).

Vibration Analysis for Pigging of Suspension Pipe Bridge

2012 ◽  
Vol 201-202 ◽  
pp. 669-672 ◽  
Author(s):  
Wen Ming Wang ◽  
Shi Min Zhang ◽  
Shang Na Song ◽  
Yin Li
Keyword(s):  
Theoretical Basis ◽  
Oil And Gas ◽  
Variable Load ◽  
Pipeline System ◽  
Liquid Loading ◽  
Dynamic Finite Element ◽  
Element Simulation ◽  
The Stability ◽  
Stability Of Structure ◽  
Strong Dynamic

Suspension pipe bridge is the key part of oil and gas pipeline system. Liquid loading during the pigging process will cause strong dynamic load of impact, thus the stability of structure will be destroyed. Paper establishes the pipeline pigging model suffered by the stress, analyzes the stress and vibration equation of the pigging pipeline. With the dynamic finite element simulation by the method of variable load, paper analyzes the vibration numeric of the pigging pipeline when the pig goes through the pipeline. The analysis of this paper provides the technical support and theoretical basis for pigging work.

On the stability of the space–time discontinuous Galerkin method for the numerical solution of nonstationary nonlinear convection–diffusion problems

2015 ◽  
Vol 23 (3) ◽  
Author(s):  
Monika Balázsová ◽  
Miloslav Feistauer ◽  
Martin Hadrava ◽  
Adam Kosík
Keyword(s):  
Galerkin Method ◽  
Discontinuous Galerkin ◽  
Discontinuous Galerkin Method ◽  
Space Time ◽  
Nonlinear Convection ◽  
Convection Diffusion ◽  
The Subject ◽  
The Stability ◽  
Theoretical Results ◽  
Diffusion Problems

AbstractThe subject of this paper is the analysis of the space-time discontinuous Galerkin method for the solution of nonstationary, nonlinear, convection-diffusion problems. In the formulation of the numerical scheme, the nonsymmetric, symmetric and incomplete versions of the discretization of diffusion terms and interior and boundary penalty are used. Then error estimates are briefly characterized. The main attention is paid to the investigation of unconditional stability of the method. An important tool is the concept of the discrete characteristic function. Theoretical results are accompanied by numerical experiments.

GEOLOGICAL AND PHYSICAL CHARACTERISTICS OF PRODUCING FORMATIONS AND THEIR ROLE IN OCCURRENCE OF OIL, GAS AND WATER SHOWINGS

2015 ◽  
pp. 117-120
Author(s):  
D. M. Chudnovskii ◽  
V. A. Dolgushin ◽  
J. S. Popova
Keyword(s):  
Oil And Gas ◽  
Physical Characteristics ◽  
The Subject ◽  
Oil Gas

The subject of this study are geological and physical characteristics of productive strata in oil and gas deposits.

scholarly journals On the Numerical Simulation of HPDEs Using θ-Weighted Scheme and the Galerkin Method

Mathematics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 78
Author(s):  
Haifa Bin Jebreen ◽  
Fairouz Tchier
Keyword(s):  
Differential Equation ◽  
Galerkin Method ◽  
Linear Ordinary Differential Equation ◽  
Time Interval ◽  
Hyperbolic Partial Differential Equation ◽  
Time Step ◽  
Numerical Examples ◽  
One Dimensional ◽  
The Stability ◽  
The Galerkin Method

Herein, an efficient algorithm is proposed to solve a one-dimensional hyperbolic partial differential equation. To reach an approximate solution, we employ the θ-weighted scheme to discretize the time interval into a finite number of time steps. In each step, we have a linear ordinary differential equation. Applying the Galerkin method based on interpolating scaling functions, we can solve this ODE. Therefore, in each time step, the solution can be found as a continuous function. Stability, consistency, and convergence of the proposed method are investigated. Several numerical examples are devoted to show the accuracy and efficiency of the method and guarantee the validity of the stability, consistency, and convergence analysis.

scholarly journals Small world and stability analysis of industrial coupling symbiosis network of ecological industrial park of oil and gas resource cities

2021 ◽  
pp. 014459872098361
Author(s):  
Yanqiu Wang ◽  
Zhengxin Sun ◽  
Pengtai Li ◽  
Zhiwei Zhu
Keyword(s):  
System Analysis ◽  
Oil And Gas ◽  
Small World ◽  
Industrial Park ◽  
Sharp Change ◽  
Connected Subgraph ◽  
Network Efficiency ◽  
Complex Network Theory ◽  
The Stability ◽  
Agglomeration Coefficient

This paper analyzes the small cosmopolitan and stability of the industrial coupling symbiotic network of eco-industrial parks of oil and gas resource-based cities. Taking Daqing A Ecological Industrial Park as an example, we constructed the characteristic index system and calculated the topological parameters such as the agglomeration coefficient and the average shortest path length of the industrial coupling symbiotic network. Based on the complex network theory we analyzed the characteristics of the scaled world, constructed the adjacency matrix of material and information transfers between enterprises, drew the network topology diagram. We simulated the system analysis and analyzed the stability of the industrial coupling symbiotic network of the eco-industrial park using the network efficiency and node load and maximum connected subgraph. The analysis results are as follows: the small world degree δ of Daqing A Eco-industrial Park is 0.891, which indicates that the industrial coupled symbiotic network has strong small world characteristics; the average path is 1.268, and the agglomeration coefficient is 0.631. The probability of edge connection between two nodes in a symbiotic network is 63.1%, which has a relatively high degree of aggregation, indicating that energy and material exchanges are frequent among all enterprises in the network, the degree of network aggregation is high, and the dependence between nodes is high; when the tolerance parameter is 0 to 0.3, the network efficiency and the maximum connected subgraphs show a sharp change trend, indicating that the topology of the industrial coupling symbiotic network of the eco-industrial park changes drastically when the network is subjected to deliberate attacks. It is easy to cause the breakage of material flow and energy flow in the industrial park, which leads to the decline of the stability of the industrial coupling symbiotic network of the eco-industrial park.

Gas pipeline leakage detection in the presence of parameter uncertainty using robust extended Kalman filter

2021 ◽  
pp. 014233122198911
Author(s):  
Mohadese Jahanian ◽  
Amin Ramezani ◽  
Ali Moarefianpour ◽  
Mahdi Aliari Shouredeli
Keyword(s):  
Kalman Filter ◽  
Extended Kalman Filter ◽  
Parameter Uncertainty ◽  
Oil And Gas ◽  
Estimation Error ◽  
Real Data ◽  
Gas Pipeline ◽  
Pipeline System ◽  
Parameter Uncertainties ◽  
Simulation Results

One of the most significant systems that can be expressed by partial differential equations (PDEs) is the transmission pipeline system. To avoid the accidents that originated from oil and gas pipeline leakage, the exact location and quantity of leakage are required to be recognized. The designed goal is a leakage diagnosis based on the system model and the use of real data provided by transmission line systems. Nonlinear equations of the system have been extracted employing continuity and momentum equations. In this paper, the extended Kalman filter (EKF) is used to detect and locate the leakage and to attenuate the negative effects of measurement and process noises. Besides, a robust extended Kalman filter (REKF) is applied to compensate for the effect of parameter uncertainty. The quantity and the location of the occurred leakage are estimated along the pipeline. Simulation results show that REKF has better estimations of the leak and its location as compared with that of EKF. This filter is robust against process noise, measurement noise, parameter uncertainties, and guarantees a higher limit for the covariance of state estimation error as well. It is remarkable that simulation results are evaluated by OLGA software.

Bankenwettbewerb und die Stabilität von Finanzsektoren

2021 ◽  
Vol 70 (1) ◽  
pp. 1-36
Author(s):  
Toni Richter
Keyword(s):  
Economic Policy ◽  
Precise Measurement ◽  
Policy Discourse ◽  
Competitive Effect ◽  
Too Big To Fail ◽  
Financial Systems ◽  
The Subject ◽  
State Of Research ◽  
The Stability ◽  
Elementary Basis

Abstract Since the financial crisis of 2008 and intensified during the corona crisis, the interdependence between the stability of the financial systems and the prevailing degree of competition (DC) has been the subject of scientific and economic policy discourse on fragmented markets and „too-big-to-fail“ banks. In theory and empiricism, two fundamentally contrary causal concepts are opposed, the elementary basis of which is the precise measurement of the DC: Competition-stability- versus Fragility-Hypothesis. Based on the recent state of research, it can be shown that alternative DC-Measurements consistently show significantly different competitive conditions and in consequence the evidence for or against a stability-enhancing competitive effect seems to be predetermined by the chosen DC-Measurement.

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