Rapid drop time on-line Fast Fourier Transform faradaic admittance measurements

1978 ◽  
Vol 50 (8) ◽  
pp. 1073-1079 ◽  
Author(s):  
Roger J. O'Halloran ◽  
Jerome C. Schaar ◽  
Donald E. Smith
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
On Line ◽  
Drop Time ◽  
Rapid Drop

scholarly journals Real-Time Monitoring of Micro-Electricity Generation Through the Voltage Across a Storage Capacitor Charged by a Simple Microbial Fuel Cell Reactor with Fast Fourier Transform

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2610 ◽  
Author(s):  
Jung-Chieh Su ◽  
Szu-Ching Tang ◽  
Po-Jui Su ◽  
Jung-Jeng Su
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Microbial Fuel Cells ◽  
Oxygen Demand ◽  
Electricity Production ◽  
Storage Capacitor ◽  
Anaerobic Sludge ◽  
Piggery Wastewater ◽  
On Line ◽  
Cell Reactor

The pattern of micro-electricity production of simple two-chamber microbial fuel cells (MFC) was monitored in this study. Piggery wastewater and anaerobic sludge served as fuel and inocula for the MFC, respectively. The output power, including voltage and current generation, of triplicate MFCs was measured using an on-line monitoring system. The maximum voltage obtained among the triplicates was 0.663 V. We also found that removal efficiency of chemical oxygen demand (COD) and biochemical oxygen demand (BOD) in the piggery wastewater was 94.99 and 98.63%, respectively. Moreover, analytical results of Fast Fourier Transform (FFT) demonstrated that the output current comprised alternating current (AC) and direct current (DC) components, ranging from mA to μA.

scholarly journals Diagnosis of rotor faults by fast Fourier transform using an auxiliary winding voltage

2021 ◽  
Vol 24 (2) ◽  
pp. 680
Author(s):  
Yakout Khadouj Jelbaoui ◽  
Lamiaa El Menzhi ◽  
Abdallah Saad
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Early Stage ◽  
Induction Machine ◽  
Load Level ◽  
Maintenance Cost ◽  
Fast Fourier Transform Analysis ◽  
Squirrel Cage ◽  
On Line ◽  
System Breakdown

<p>Condition monitoring and on-line detection have attracted several researchers in order to carry out an efficient diagnosis of machine failures. Therefore, the detection in early stage avoids system breakdown and reduce the maintenance cost. This paper presents a new diagnosic approach to detect the broken bars and broken end ring faults for a squirrel cage induction machine based on the fast Fourier transform analysis applied on a new signature as the voltage of an auxiliary winding. The auxiliary winding is a small coil inserted between two of the stator phases, the explicit expression of its voltage is presented. The signal is monitored in six faults cases under a different load level, the emergence of the fault frequencies changes for each kind of failure. The successfully simulation results obtained show the effectiveness of this approach.</p>

High speed synchronous data generation and sampler system: application to on-line fast Fourier transform faradaic admittance measurements

1977 ◽  
Vol 49 (12) ◽  
pp. 1797-1805 ◽  
Author(s):  
R. J. Schwall ◽  
A. M. Bond ◽  
R. J. Loyd ◽  
J. G. Larsen ◽  
D. E. Smith
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
System Application ◽  
High Speed ◽  
Data Generation ◽  
On Line

Direkte digitale Abschätzung von Leistungsdichtespektren an Kernreaktoren

1974 ◽  
Vol 22 (1) ◽  
Author(s):  
H. A. Hoermann
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
On Line ◽  
Direktes Verfahren

Bei der digitalen On-Line-Abschätzung von Leistungsdichtespektren über große Frequenzbereiche ergeben sich hinsichtlich Speicherkapazität bzw. Arbeitsgeschwindigkeit Probleme, wenn mittlere Prozeßrechner eingesetzt werden sollen. Es wird ein direktes Verfahren mit vorgeschalteter Grobfilterung beschrieben, das im Gegensatz zur ,Fast Fourier Transform‘ eine frequenzproportionale Auflösungsbandbreite zuläßt und ohne umfangreiche Datenspeicherung auskommt.

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