Application of π Equivalent Circuit in Mathematic Modeling and Simulation of Gas Pipeline

2014 ◽  
Vol 496-500 ◽  
pp. 943-946 ◽  
Author(s):  
Jun Ru Wang ◽  
Tao Wang ◽  
Jun Zheng Wang
Keyword(s):  
Transfer Function ◽  
Modeling And Simulation ◽  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Gas Pipeline ◽  
Pipeline System ◽  
Frequency Responses ◽  
Mathematic Modeling ◽  
Analytic Process ◽  
Equivalent Circuit Models

To simplify the analytic process of the conventional modeling method, an equivalent circuit is constructed to simulate the dynamic analysis of pressurized gas pipeline system. The several π equivalent circuit models are built for a section of gas pressurized pipeline. The transfer function and scheme for the realization of the simulation model are given in detail. Based on the simulation of frequency responses for the π equivalent circuit models and the exact model, it is shown that the π equivalent circuit model is of high simulating accuracy.

scholarly journals Parameter identification of pulsed eddy current testing equivalent circuit model and its application to defect evaluation

2021 ◽  
pp. 002029402110203
Author(s):  
Zhiyuan Xu ◽  
Shanwei Fan ◽  
Tiejun Song
Keyword(s):  
System Identification ◽  
Transfer Function ◽  
Equivalent Circuit ◽  
Eddy Current ◽  
System Analysis ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Eddy Current Testing ◽  
Current Testing ◽  
Pulsed Eddy Current

The equivalent circuit model of pulsed eddy current testing (PECT) has simple mathematics but its applications are limited to qualitative analysis such as principle illustration and signal interpretation. In this paper, the parameters of equivalent circuit model are estimated using system identification method and quantitative relationships are found between some of the parameters and the size of the defect. The equivalent circuit equations were solved from the perspective of system analysis to yield the system transfer function. An m-sequence of 10 order was selected to excite the system and the probe current was used as the output. A set of experiment input-output data for system identification were obtained by performing experiments on two aluminium alloy 6061 slabs, one of which was machined with five slots of different widths, and the other one was machined with five depth-varied slots. The equivalent circuit parameters were finally estimated based on the identified transfer function parameters. It is found that the values of resistance and self-inductance of the secondary windings decrease greatly and monotonically with the increase of the slot width or depth. The self-inductance is more sensitive to the slot size variation than the resistance. Both of them have the potential to serve as the signal feature for defect evaluation in PECT applications.

Electrocircuit Modeling and Simulation Analysis of a Resonant Acoustic Gas Sensor

2013 ◽  
Vol 846-847 ◽  
pp. 563-568
Author(s):  
Ting Zhang ◽  
Shu Wang
Keyword(s):  
Resonant Frequency ◽  
Modeling And Simulation ◽  
Equivalent Circuit ◽  
Gas Sensor ◽  
Simulation Analysis ◽  
Equivalent Circuit Model ◽  
Gas Mixture ◽  
Measurement And Analysis ◽  
Impedance Curve ◽  
Link Model

A modified equivalent circuit model of an acoustic gas sensor with resonator is introduced in this paper. Based on FMYB and Babak models, our modified RCL-link model simulates the impedance curve in terms of amplitude and resonant frequency well. This modeling would be a helpful step to the gas mixture measurement and analysis.

scholarly journals An equivalent circuit model of a rectangular bracket shaped DGS and its microwave filter applications

2019 ◽  
Vol 70 (1) ◽  
pp. 32-38
Author(s):  
Baidenger Agyekum Twumasi ◽  
Jia-Lin Li
Keyword(s):  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Unit Cell ◽  
Microwave Filters ◽  
Microwave Filter ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Frequency Responses ◽  
Microwave Engineering

Abstract A lumped-LC equivalent circuit to model a novel rectangular bracket shaped defected ground structure (DGS) is presented in this paper. The presented equivalent circuit can accurately predicate the frequency responses, in terms of the magnitude and phase responses of S parameters, of the studied DGS. The lumped LC parameters of the presented model are extracted based on a unit cell of the DGS. Further, the model is found to be applicable in microwave engineering, including microwave filter designs. Some design examples are presented and examined. The studied DGS based microwave filters characterize maximum passband flatness, sharp skirt between the passband and stopband and wide stopband. The studied equivalent circuit model can accurately predicate the frequency responses including the magnitude and phase of S parameters.

Hoeffding Evolutionary Algorithm and its Application in Building Equivalent Circuit Models for Lithium-Ion Battery

2015 ◽  
Vol 713-715 ◽  
pp. 1099-1102
Author(s):  
Jing Jing Wu ◽  
Jing Huang ◽  
Hai Long Li ◽  
Wan Li Kang
Keyword(s):  
Evolutionary Algorithms ◽  
Evolutionary Algorithm ◽  
State Estimation ◽  
Lithium Ion Battery ◽  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Lithium Ion ◽  
The State ◽  
State Of Charge ◽  
Equivalent Circuit Models

There has been a growing interest in building equivalent circuit models for lithium-ion battery with evolutionary algorithms. One of the well-known algorithm is the Hoeffding bound based evolutionary algorithm (HEA). In this paper, we first introduce the definitions of the Hoeffding bound, selection operations and Hoeffding evolutionary algorithm. And then, we introduced the method for building equivalent circuit models, which composed of four fundamental functions, connection-modifying function, component-creating function, arithmetic-performing functions and automatically defined function. In this way, a Hoeffding-evolutionary-algorithm based equivalent-circuit-model for lithium-ion battery is modeled. With the model-based state estimation approaches, the obtained model can assess the state-of-charge (SOC) of cells precisely.

scholarly journals Investigation of the effects of the equivalent circuit parameters on induction motor torque using three different equivalent circuit models

2018 ◽  
Vol 157 ◽  
pp. 01019
Author(s):  
Mehmet Murat Tezcan ◽  
Asim Gökhan Yetgin ◽  
Ali Ihsan Canakoglu ◽  
Bariş Cevher ◽  
Mustafa Turan ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Induction Motor ◽  
Characteristic Curve ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Rotor Resistance ◽  
Equivalent Circuit Parameters ◽  
Torque Values ◽  
Cage Induction Motor ◽  
Equivalent Circuit Models

In this study, the most vital characteristic properties of induction motor, motor starting, maximum and nominal torque are analyzed for what are affected. For the analysis of torque, L type, T type and IEEE 112 equivalent circuit model is employed. Torque change is investigated with the help of codes developed in MATLAB to be used in electrical machines course. First, the slip-moment characteristic curve of the induction motor is divided into three working zones and it was determined which equivalent circuit model gave the best results in these study zones. Later, such parameters as stator and rotor resistance, stator and rotor reactance, magnetization reactance, core resistance and slip are researched for how torque values are affected from. The obtained values for each of the three equivalent circuit models are given and compared with experimental results. 50 HP squirrel cage induction motor parameters are used in analysis. In the analysis, the most influential parameters on the starting torque are found as rotor resistance and stator and rotor reactance. Change of other parameters’ impact ratio depending upon right proportion and inverse proportion is observed. When nominal torque variations are investigated, again rotor resistance is the most influential parameter and by selecting proper factor effecting rotor resistance during design, the result of acquiring desired rotor resistance is obtained. When the maximum torque variations are examined, it appears that the stator and rotor reactance values are effective. Starting, maximum and nominal torque expressions change with square of voltage alters the effect on them a lot. Therefore, triangle or star connection importance arises during machine design.

A Method to Construct Equivalent Circuit Model From Frequency Responses With Guaranteed Passivity

2011 ◽  
Vol 26 (1) ◽  
pp. 400-409 ◽  
Author(s):  
Iraj Rahimi Pordanjani ◽  
C. Y. Chung ◽  
Hooman Erfanian Mazin ◽  
Wilsun Xu
Keyword(s):  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Frequency Responses

A Research and Analysis on Equivalent Circuit Model of Lead-Acid Batteries of Armored Vehicles

2014 ◽  
Vol 654 ◽  
pp. 119-123
Author(s):  
Kuang Cheng Li ◽  
Yan Liu ◽  
Zheng Liu ◽  
Huai Bin Yang
Keyword(s):  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
The State ◽  
Equivalent Circuits ◽  
Lead Acid Battery ◽  
Lead Acid Batteries ◽  
Armored Vehicles ◽  
Equivalent Circuit Models ◽  
Lead Acid

To analyze the operation of the lead-acid battery of armored vehicles and facilitate the measurement of the state parameters, we need to see the lead-acid battery as a plurality of ideal components and establish the corresponding equivalent circuit model and characterize it. This paper describes several equivalent circuit models of commonly used lead-acid batteries, on this basis, we give the equivalent circuit model of lead-acid batteries of armored vehicles, and to analyze the variables of equivalent circuits.

An Equivalent Circuit Model for Vertical Comb Drive MEMS Optical Scanner Controlled by Pulse Width Modulation

2012 ◽  
Vol 132 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Satoshi Maruyama ◽  
Muneki Nakada ◽  
Makoto Mita ◽  
Takuya Takahashi ◽  
Hiroyuki Fujita ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Comb Drive ◽  
Optical Scanner
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