PRELIMINARY STUDY OF AN ARDUINO CONTROLLED SHAKE TABLE TO LOW-FREQUENCY TEST

2021 ◽  
Author(s):  
Ledymar F. Moreno ◽  
Marcus V. G. de Morais ◽  
Suzana M. Avila
Keyword(s):  
Low Frequency ◽  
Shake Table ◽  
Frequency Test ◽  
Preliminary Study

scholarly journals Preliminary study of new load shedding method considering LFC control

2020 ◽  
Vol 152 ◽  
pp. 01006
Author(s):  
Hiroto Kageyama ◽  
Nobuyuki Yamaguchi
Keyword(s):  
Power Generation ◽  
Power Output ◽  
Solar Power ◽  
Low Frequency ◽  
Load Ratio ◽  
Load Shedding ◽  
Target Area ◽  
Entire System ◽  
Photovoltaic Power ◽  
Preliminary Study

The introduction of a large amount of photovoltaic power generation reduces the load on the entire system when the low frequency load is interrupted, but the photovoltaic power generation connected to the relevant line is also separated, so that it becomes an independent operation in the partial system, and the supply power is also reduced. There is a possibility of reduction. In conventional UFLS, after observing the frequency, the load is cut off in units of several seconds. The load shedding amount is determined by the load ratio of the entire system at that time. In this study, the UFLS model will be added to the existing IEEJ AGC30. The demand and solar power output in the target area are divided into substations to create data, and the solar power output of each substation is taken into account to grasp a more accurate load. The validity of this model is verified by simulating frequency fluctuation and LFC operation.

Effect of Infrasound and Low Frequency Sound Exposure at Intensities below 100 dB(SPL) on the Rota-Rod Treadmill Performance of Guinea Pigs

1983 ◽  
Vol 2 (3) ◽  
pp. 37-41 ◽  
Author(s):  
Naoki Maehara ◽  
Reiko Kishi ◽  
Terukazu Sadamoto ◽  
Izumi Harabuchi ◽  
Kohtaroh Yamamura
Keyword(s):  
Guinea Pigs ◽  
Motor Coordination ◽  
Low Frequency ◽  
Vestibular Function ◽  
Moderate Intensity ◽  
Endurance Time ◽  
Frequency Sound ◽  
Sound Exposure ◽  
Preliminary Study

A preliminary study to investigate whether or not long-term exposure to very low frequency sound at a moderate intensity below 100 dB(SPL) affects the vestibular function and/or motor coordination in guinea pigs was carried out. At first, optimal conditions of Rota-Rod Treadmill performance for guinea pigs were determined. Then, 20 and 40 Hz-low frequency sound at 80–90 dB(SPL) exposure was used for 150 minutes and measurement of the endurance time on the Rota-Rod Treadmill was carried out at rotation speeds of 8 rpm or 10 rpm. At 10 rpm rotation speed, and 20 Hz, 90 dB(SPL) stimulus, the endurance time was significantly reduced at 150 minutes, compared with that of the control, whereas no significant reduction in endurance time was obtained at 85 dB(SPL).

scholarly journals A study on Electron Oscillations in the Magnetosheath of Mars with Mars Express observations

2016 ◽  
Vol 12 (S328) ◽  
pp. 230-232
Author(s):  
Adriane M. de Souza ◽  
Ezequiel Echer ◽  
Mauricio J. A. Bolzam ◽  
Markus Fränz
Keyword(s):  
Wavelet Transform ◽  
Electron Density ◽  
Low Frequency ◽  
Morlet Wavelet ◽  
Space Plasmas ◽  
Density Data ◽  
Mars Express ◽  
Preliminary Study ◽  
Morlet Wavelet Transform ◽  
Low Frequency Waves

AbstractWavelet analysis was employed to identify the major frequencies of low-frequency waves present in the Martian magnetosheath. The Morlet wavelet transform was selected and applied to the electron density data, obtained from the Analyzer of Space Plasmas and Energetic Atoms experiment (ASPERA-3), onboard the Mars Express (MEX) spacecraft. We have selected magnetosheath crossings and analyzed electron density data. From a preliminary study of 502 magnetosheath crossings (observed during the year of 2005), we have found 1409 periods between 0.005 and 0.06Hz. The major frequencies observed were in the range 0.005-0.02 Hz with 58.5% of the 1409 frequencies identified.

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