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1.

Implement a Portable Smart Device for Elder Health Care Ching-Sung Wang, S. M. Chen American Journal of Electrical and Electronic Engineering. 2020 8 (3). doi: 10.12691/ajeee-8-3-5 Keywords: automatic window glass opening device, emergency rescue, sensor, water level detection, abnormal gas detection Context: ...e art sensor technology, the intelligent sensor comes out to be capable of recording aged people’s essential tremor spectrum via fast Fourier transform (FFT) and their daily exercise simultaneously. With gathering both of detecting information, the sensor would be trans... Abstract Full Text (PDF) [Epub] Full Text (HTML)

2.

Vibration Analysis of Gas Turbine SIEMENS 162MW- V94.2 Related to Iran Power Plant Industry in Fars Province Omid Ali Zargar Journal of Mechanical Design and Vibration. 2014 2 (1). doi: 10.12691/jmdv-2-1-1 Keywords: gas turbine, turbine compressor, vibration data collector, utility, condition monitoring, non-contact probe, Relative Vibration, Absolute Vibration, Split Resonance, time wave form (TWF), fast Fourier transform (FFT) Context: ...achinery technical specification are introduced. Besides, absolute and relative vibration trends, turbine and compressor orbits, fast Fourier transform (FFT) in absolute vibrations, vibration modal analysis, turbine and compressor start up and shut down conditions, bode... Abstract Full Text (PDF) [Epub] Full Text (HTML)

3.

Characterization of Orthogonal Frequency Division Multiplexing (OFDM) Communication Links Rahmon Kamorudeen Adewale, Ogunti Erastus Olarewaju, Apena Waliu Olalekan American Journal of Electrical and Electronic Engineering. 2020 8 (3). doi: 10.12691/ajeee-8-3-4 Keywords: OFDM, BER, M-PSK, M-QAM, FFT, AWGN channel, Rayleigh channel, Rician channel Context: ...multipath fading channels in OFDM system. Bit error rate (BER) was used to evaluate the performance of the system; the number of fast Fourier transform (FFT) points used during the transmission was also examined. The results showed that for all the channels, lower order... Abstract Full Text (PDF) [Epub] Full Text (HTML)

4.

Investigations of Dynamic Characteristics of Eccentric Rotary Shaft of Wankelengine N. D. Pagar, S. H. Gawande Journal of Mechanical Design and Vibration. 2014 2 (2). doi: 10.12691/jmdv-2-2-3 Keywords: modal analysis, natural frequency, resonance, finite element analysis (FEA), fast Fourier transform (FFT) Context: Accurate prediction of critical speeds in rotating machinery is of great importance to designer and many attempts have been made to calculate it exactly. At the design stage it is necessary to predict accurately the dynamic behavior of rotating system of rotating parts of Wankelengine in order to avoid resonant conditions at operating speeds. Critical speed of a rotating shaft differs from its non-rotating natural frequency. The main reason for this difference is known to be the gyroscopic momentum. So it is quite great important to determine the natural frequency of the eccentric shaft in non-rotating condition (free-free condition) i.e. degrees of freedom are not restricted. In this study the natural frequency and mode shapes are predicted for the eccentric shaft in free-free condition (non-rotating) by using the commercial software package (ANSYS) in its modal analysis option. And results obtained from it are compared with experimental modal analysis (FFT analyzer). The verified results leads to the prediction of the dynamic behavior of the eccentric shaft viz. design calculations, natural frequencies, mode shapes. Abstract Full Text (PDF) [Epub] Full Text (HTML)