Mathematical modeling and simulation of pigging operation in gas and liquid pipelines

Numerical simulation of contact force on bi-directional pig in gas pipeline: At the early stage of pigging

Experimental study on dynamics of rotatable bypass-valve in speed control pig in gas pipeline

Free vibration analysis of a functionally graded graphene nanoplatelet reinforced disk-shaft assembly with whirl motion

Effect of blockage ratios on the characteristics of methane/air explosion suppressed by BC powder.

In this paper, a robust optimal fuzzy controller based on the Pulse Width Modulation (PWM) technique is proposed to control a laboratory parallel robot using inexpensive on/off solenoid valves. The controller coefficients are determined using Modified Cuckoo Optimization Algorithm. The objective function of this method is considered such that the results show the position tracking by the robot with less force and more efficiency. Regarding the results of experimental tests, the control strategy with on/off valves indicates good performance such that the maximum value of RMS of error for a circular path with increasing force on the system is 3.1mm. Furthermore, the results show the superiority of the optimal fuzzy controller compared with optimal PID controller in tracking paths with different conditions and uncertainties.

Simulation and experimental control of a 3-RPR parallel robot using optimal fuzzy controller and fast on/off solenoid valves based on the PWM wave.

Dynamic analysis and simulation of long pig in gas pipeline

The derivation and solution of the two and three dimensional dynamic equations for a small pipeline inspection gauge (Pig) through a liquid pipeline is the main aim of this work. These equations can be used for synthesis of speed controller of a pig by using a bypass port in Pig. Momentum and energy equations are employed to study the influence of flow field on the Pig’s trajectory. The pig is assumed to be a small rigid body with a bypass hole in its body. The variation of the diameter of the bypass port, which is controlled by a valve, is considered in this formulation. The path of the pig or geometry of the pipeline is assumed to be 2D and 3D curve. 2D and 3D simulations of the pig motion are performed individually and a case has been solved and discussed for each of them. The simulation results show that the derived equations are valid and effective for online estimating of the position, velocity and forces acting on the pig at any time of its motion.

https://jafmonline.net/JournalArchive/download?file_ID=15366&issue_ID=208

Dynamic Analysis of Small Pig through Two and Three- Dimensional Liquid Pipeline

Active Vibration Control of an FGM Rectangular Plate using Fuzzy Logic Controllers

To provide an efficient inspection of pipeline, pigging operations must be executed at a constant speed. This paper presents an efficient and simple method based on Quantitative Feedback Theory (QFT), which is a well-known robust controller scheme, for speed control of a pig with bypass flow in a liquid pipeline. This classical-type controller commands the valve installed in the body of the pig to open or close. Then, the pig is controlled using the amount of bypass flow across its body. For this purpose, the nonlinear dynamic equation of motion of the pig is converted to a family of linear uncertain equivalent plants using Sobhani-Rafeeyan’s method (SR method). Then, for this family of uncertain equivalent plants, a QFT-type controller is synthesized. The presented method is developed for two-dimensional pipelines in two cases. The designed controllers are simulated numerically using the Simulink toolbox of the MATLAB software. The simulation results show that the designed controller can be used for speed control of the pig with good performance when it runs in the liquid pipelines.

/pdf/speed-control-of-pipeline-pig-using-the-qft-method-ln3eim9vy4.pdf

Mansour Rafeeyan

Papers

Simulation and experimental control of a 3-RPR parallel robot using optimal fuzzy controller and fast on/off solenoid valves based on the PWM wave.

Dynamic analysis and simulation of long pig in gas pipeline

Dynamic Analysis of Small Pig through Two and Three- Dimensional Liquid Pipeline

Active Vibration Control of an FGM Rectangular Plate using Fuzzy Logic Controllers

Speed Control of Pipeline Pig Using the QFT Method