scholarly journals AC Equivalent Circuit Model of an Electrochemical Accelerometer for 3D Numerical Simulation in the Low-Frequency Range

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4686
Author(s):  
Qiuzhan Zhou ◽  
Yuzhu Chen ◽  
Jikang Hu ◽  
Boshi Lyu
Keyword(s):  
Numerical Simulation ◽  
Equivalent Circuit ◽  
Characteristic Curve ◽  
Equivalent Circuit Model ◽  
Low Frequency ◽  
Circuit Model ◽  
Frequency Range ◽  
Element Analysis ◽  
Amplitude Frequency Characteristic ◽  
Vibration Sensors

The electrochemical principles presented in this paper can be applied to the manufacture of vibration sensors for oil and gas exploration, as well as long-period vibration sensors for the observation of natural earthquakes. To facilitate the manufacture of high-volume electrochemical accelerometer (EAM), this paper presents an AC equivalent circuit model of an EAM in a low-frequency range. A 3D time-dependent numerical simulation based on finite element analysis was designed to combine a complex chemical reaction with electric circuit theory. A sensitive chip channel model was constructed by using partial differential equations and the problem caused by a designed mathematical model was solved by using multi-physics finite element analysis. When the electrochemical properties of an electrochemical vibration sensor and its design parameters as well as the parameters of the AC equivalent circuit model are considered, the abstract processing of the sensor on the equivalent circuit is better accomplished. The effectiveness of the proposed simulation model and the equivalent circuit model were verified by comparing the amplitude-frequency characteristic curve of the equivalent circuit with the amplitude-frequency characteristic curve of the single-channel simulation model of the sensitive chip. These model not only have great significance for the design guidance of an external conditioning circuit but also provide an effective method to decouple the output signal and noise of the sensor reaction cavity.

scholarly journals Quad-Band Bowtie Antenna Design for Wireless Communication System Using an Accurate Equivalent Circuit Model

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Mohammed Moulay ◽  
Mehadji Abri ◽  
Hadjira Abri Badaoui
Keyword(s):  
Equivalent Circuit ◽  
Communication Systems ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Mobile Wimax ◽  
Frequency Range ◽  
Band Frequency ◽  
Low Profile ◽  
Bowtie Antenna ◽  
Successful Design

A novel configuration of quad-band bowtie antenna suitable for wireless application is proposed based on accurate equivalent circuit model. The simple configuration and low profile nature of the proposed antenna lead to easy multifrequency operation. The proposed antenna is designed to satisfy specific bandwidth specifications for current communication systems including the Bluetooth (frequency range 2.4–2.485 GHz) and bands of the Unlicensed National Information Infrastructure (U-NII) low band (frequency range 5.15–5.35 GHz) and U-NII mid band (frequency range 5.47–5.725 GHz) and used for mobile WiMAX (frequency range 3.3–3.6 GHz). To validate the proposed equivalent circuit model, the simulation results are compared with those obtained by the moments method of Momentum software, the finite integration technique of CST Microwave studio, and the finite element method of HFSS software. An excellent agreement is achieved for all the designed antennas. The analysis of the simulated results confirms the successful design of quad-band bowtie antenna.

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.

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