Design of Frequency Selection Circuit of Advanced Detector Receiving Device in Coal Mine Roadway

2015 ◽  
Vol 740 ◽  
pp. 507-510
Author(s):  
Xi Gao Liu ◽  
Zhi Min Liu ◽  
Jin Tao Zhang ◽  
Yi Ming Lv ◽  
You Zhou ◽  
...  
Keyword(s):  
Coal Mine ◽  
Circuit Simulation ◽  
Band Pass Filter ◽  
Dual Frequency ◽  
Pass Filter ◽  
Frequency Selection ◽  
Mine Roadway ◽  
Frequency Components ◽  
Band Pass ◽  
Field Excitation

Coal mine roadway advanced detector, including the transmitting and receiving devices, is a kind of geophysical instrument used in coal mine roadway advanced detection based on the dynamic and directional electric field excitation method. The transmitting device emits dual frequency modulated square wave current into the excavation face and the receiving device receives potential difference of coal and rock medium generated by induced polarization, of which the frequency selection circuit is to filter the interference of the harmonics of the signal and other frequency components. The paper derived expressions of emission current. Considering the actual working conditions, the paper proposed the design requirements of the frequency selection circuit and the scheme of a controller to control multiple frequency selection filter circuits. The paper completed the design of the control circuit consisting of a microcontroller and analog switch MAX313 and the band-pass filter circuit consisting of universal active filter UAF42. According to the circuit simulation and the analysis of the data with software of multisim, it proves the design of circuit meets the requirements.

scholarly journals Design of UWB Filter with WLAN Notch

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Harish Kumar ◽  
MD. Upadhayay
Keyword(s):  
Circuit Simulation ◽  
Ground Plane ◽  
Stop Band ◽  
Simulation Software ◽  
Pass Band ◽  
Area Network ◽  
Band Pass Filter ◽  
Frequency Range ◽  
Pass Filter ◽  
Band Pass

UWB technology- (operating in broad frequency range of 3.1–10.6 GHz) based filter with WLAN notch has shown great achievement for high-speed wireless communications. To satisfy the UWB system requirements, a band pass filter with a broad pass band width, low insertion loss, and high stop-band suppression are needed. UWB filter with wireless local area network (WLAN) notch at 5.6 GHz and 3 dB fractional bandwidth of 109.5% using a microstrip structure is presented. Initially a two-transmission-pole UWB band pass filter in the frequency range 3.1–10.6 GHz is achieved by designing a parallel-coupled microstrip line with defective ground plane structure using GML 1000 substrate with specifications: dielectric constant 3.2 and thickness 0.762 mm at centre frequency 6.85 GHz. In this structure aλ/4 open-circuited stub is introduced to achieve the notch at 5.6 GHz to avoid the interference with WLAN frequency which lies in the desired UWB band. The design structure was simulated on electromagnetic circuit simulation software and fabricated by microwave integrated circuit technique. The measured VNA results show the close agreement with simulated results.

scholarly journals BPF based Estimation and Mitigation of SSR with SSSC

2019 ◽  
Vol 9 (2) ◽  
pp. 5221-5226
Keyword(s):  
Reference Value ◽  
Electrical Network ◽  
Band Pass Filter ◽  
Algebraic Equations ◽  
Torsional Mode ◽  
Pass Filter ◽  
Minimum Number ◽  
Frequency Components ◽  
Band Pass ◽  
Damping Torque

The risk of Subsynchronous Resonance (SSR) may reduce with the hybrid of active and passive series compensations. The hybrid series compensation can be done with Static Synchronous Series Compensator (SSSC) (an active FACTS device) and fixed series capacitor (passive compensation). In this paper, we propose a Band Pass Filter (BPF) based Subsynchronous Damping Controller (SSDC) with SSSC. The aim of the paper is to increase the damping of all critical TMs with minimum number of highly frequency selective BPFs. The BPFs are used to extract the subsynchronous frequency components from electrical network. The extracted subsynchronous frequency components are used to modulate the reference value of SSSC injected voltage. Thereby, the SSSC injecting voltage can suppress the subsynchronous currents flowing in the transmission network. The linear (DQ) model is developed in MATLAB-Simulink using the differential and algebraic equations of the system. The damping torque, eigenvalue and transient simulation methods are performed with the linear model to carry out the analysis of SSR. The eigenvalue analysis is used to select the number of filters. The number of BPFs is selected in view of suppressing the torsional vibrations at all critical frequencies. The outcomes of the paper show that the negative damping is considerably diminished with the proposed SSDC in the entire range of torsional mode frequencies and mitigate SSR.

scholarly journals Automatic Detection of Myocardial Infarction Based on High-Frequency QRS Analysis

2020 ◽  
Vol 36 (1) ◽  
Author(s):  
Hoang Van Manh ◽  
Pham Manh Thang
Keyword(s):  
Myocardial Infarction ◽  
High Frequency ◽  
Decision Rules ◽  
Automatic Detection ◽  
Band Pass Filter ◽  
Qrs Complex ◽  
Pass Filter ◽  
Morphological Index ◽  
Frequency Components ◽  
Band Pass

In this paper, we present an algorithm for automatic detection of myocardial infarction using high-frequency components of the ECG signal. Firstly, the QRS complexes and their boundaries are identified. Then, the correlation matrix between the detected QRS complexes in each lead is determined to eliminate noises and ectopic oscillations. The dominant QRS complexes are finally determined using cluster analysis. These resulting values are averaged to have a unique representative QRS complex in a given lead. This averaged signal is then passed through a band-pass filter to obtain high-frequency components of the QRS complex. Finally, the High-Frequency Morphological Index (HFMI) for each lead is calculated and diagnosed with myocardial infarction based on decision rules. The performance of the proposed algorithm is evaluated on signals from the PTB database. The obtained results show that the proposed method reached satisfactory performance compared with the results from clinical studies. Keywords: Myocardial infarction, High-frequency ECG, RAZ, RMS, HFMI.  

OBSERVATION AND SIMULATION OF TSUNAMIS INDUCED BY THE 2003 TOKACHI-OKI EARTHQUAKE (M 8.0)

2015 ◽  
Vol 2 (3) ◽  
Author(s):  
Tatsuo Ohmachi ◽  
Shusaku Inoue ◽  
Tetsuji Imai
Keyword(s):  
Rayleigh Wave ◽  
Water Pressure ◽  
Near Field ◽  
Source Region ◽  
Tsunami Source ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Tsunami Simulation ◽  
Sea Bed ◽  
Band Pass

The 2003 Tokachi-oki earthquake (MJ 8.0) occurred off the southeastern coast of Tokachi, Japan, and generated a large tsunami which arrived at Tokachi Harbor at 04:56 with a wave height of 4.3 m. Japan Marine Science and Technology Center (JAMSTEC) recovered records of water pressure and sea-bed acceleration at the bottom of the tsunami source region. These records are first introduced with some findings from Fourier analysis and band-pass filter analysis. Water pressure disturbance lasted for over 30 minutes and the duration was longer than those of accelerations. Predominant periods of the pressure looked like those excited by Rayleigh waves. Next, numerical simulation was conducted using the dynamic tsunami simulation technique able to represent generation and propagation of Rayleigh wave and tsunami, with a satisfactory result showing validity and usefulness of this technique. Keywords: Earthquake, Rayleigh wave, tsunami, near-field

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