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Journal articles on the topic 'FFT Analyzer'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Betta, G., M. D'Apuzzo, C. Liguori, and A. Pietrosanto. "An intelligent FFT-analyzer." IEEE Transactions on Instrumentation and Measurement 47, no. 5 (1998): 1173–79. http://dx.doi.org/10.1109/19.746578.

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2

Watanabe, Akio, Haruo Sugiyama, and Toshihiko Ishigami. "Spectral measurement method with FFT Analyzer." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 73, Appendix (1989): 95. http://dx.doi.org/10.2150/jieij1980.73.appendix_95.

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3

Kalaiarasi, N., and Sahitya Bhoumik. "FFT Spectrum Analyzer using Goertzel Filter." International Journal of Applied Information Systems 4, no. 5 (October 10, 2012): 20–24. http://dx.doi.org/10.5120/ijais12-450706.

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4

ANDOH, Yoshiaki, Masaki KURIHARA, Motoyuki SUZUKI, Hajime MIYASHITA, and Kohji HASEGAWA. "Analysis of bruxism sounds using the FFT analyzer." Nihon Shishubyo Gakkai Kaishi (Journal of the Japanese Society of Periodontology) 28, no. 3 (1986): 825–36. http://dx.doi.org/10.2329/perio.28.825.

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5

., Namdev A. Patil. "VIBRATION ANALYSIS OF CI ENGINE USING FFT ANALYZER." International Journal of Research in Engineering and Technology 05, no. 01 (January 25, 2016): 293–98. http://dx.doi.org/10.15623/ijret.2016.0501060.

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6

Cai, Lin. "The Design of Power Harmonic Analyzer Based on UC/OS-II." Advanced Materials Research 1055 (November 2014): 118–21. http://dx.doi.org/10.4028/www.scientific.net/amr.1055.118.

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In this paper, we discuss the applications of UC/OS-II and DSP(digital signal processor) in area of harmonic analyzing. In this research, the FFT algorithm is employed, and the realization of FFT on DSP is discussed. The whole system is based on UC/OS-II operation system, which coordinate all the tasks about the system. The system based on DSP+ARM and UC/OS-II improve the reliability and real time quality. The hardware design and software design are proposed in this paper, with flow chart and part of routine codes shown.

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7

Liguori, C., and A. Paolillo. "Implementing Uncertainty Auto-Evaluation Capabilities on an Intelligent FFT Analyzer." IEEE Transactions on Instrumentation and Measurement 53, no. 3 (June 2004): 700–708. http://dx.doi.org/10.1109/tim.2004.827074.

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8

Betta, G., C. Liguori, and A. Pietrosanto. "A multi-application FFT analyzer based on a DSP architecture." IEEE Transactions on Instrumentation and Measurement 50, no. 3 (June 2001): 825–32. http://dx.doi.org/10.1109/19.930461.

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9

Metri, Prabhakar. "Fault Diagnosis of Rotary Machine Using FFT (Fast Fourier Transformation) and Orbital Analyzer." International Journal for Research in Applied Science and Engineering Technology 9, no. VII (July 31, 2021): 2673–81. http://dx.doi.org/10.22214/ijraset.2021.36933.

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In different industries we use different machines and most of the machines are rotary machines. The small fault in machine cause vibrations in machines. These vibrations may cause effect on machine or product produced by machine. So, it is important to study these faults present in the machines. In this paper we are going to discuss fault detection techniques. We are discussing two technique FFT (Fast Fourier Transformation) and Orbital Analysis. In FFT we are getting graphs with respect to frequencies and according to peak frequencies we predict fault while in Orbital Analysis we are getting different orbital shape graph and according to shape we predict fault in machine.

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10

Ahmadi, H., M. Subchan, R. E. Rachmanita, R. D. Audora, and A. Wibuana. "Vibration analysis of Kartini reactor secondary cooling pump using FFT analyzer." Journal of Physics: Conference Series 1511 (April 2020): 012080. http://dx.doi.org/10.1088/1742-6596/1511/1/012080.

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11

Zhou, Li Qing, Da Xu, Shuang Hu, and Peng Xu. "A New Portable Harmonic Analyzer Based on MSP430." Advanced Materials Research 971-973 (June 2014): 1059–63. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1059.

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In this paper, a new portable digital instrument is developed to measure the frequency, rms voltage, rms current and harmonic of power grid. Three phase voltage and current are sensed with precise transformer and then processed by signal conditioning unit before sampling. Synchronous AC sampling technique is introduced to avoid leakage effect of FFT. Consequently, frequency estimation, rms measurement and harmonic estimation are achieved based on MSP430. The experiment results indicate that this analyzer provides accurate frequency estimates with error in the range of 0.001Hz and amplitude estimates with error in the range of 0.1%, which can meet the need of offline application.

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12

Liguori, C., A. Paolillo, and A. Pignotti. "An Intelligent FFT Analyzer With Harmonic Interference Effect Correction and Uncertainty Evaluation." IEEE Transactions on Instrumentation and Measurement 53, no. 4 (August 2004): 1125–31. http://dx.doi.org/10.1109/tim.2004.831473.

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13

Sansaloni, Trini, Asun Perez-Pascual, Vicente Torres, VicenÇ Almenar, JosÉ F. Toledo, and Javier Valls. "FFT Spectrum Analyzer Project for Teaching Digital Signal Processing With FPGA Devices." IEEE Transactions on Education 50, no. 3 (August 2007): 229–35. http://dx.doi.org/10.1109/te.2007.900025.

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14

Patil, Rajhans. "Design Optimization of Radiator Fan Blade Using Fiber-Reinforced Plastic Material." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (August 31, 2021): 1327–37. http://dx.doi.org/10.22214/ijraset.2021.37591.

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Abstract: The Aim of this paper is to study failures in radiator fan blades due to Resonance and optimization in design, which will withstand the failure conditions. The Modal Analysis is carried out in ANSYS and it is validated through Experimental Techniques. The correlation between modal analysis and experimental analysis is determined. Suitable material which withstands the resonance is determined and validated in ANSYS and FFT Analyzer. In absence of design data, the reverse engineering process is considered as a major tool for modeling. Using the data the solid model of the radiator blade is created in CAD. We have used modal analysis to calculate the natural frequencies and mode shapes of a Radiator fan. The natural frequencies and mode shapes are critical components in the design of any structure. Experimental Analysis is accomplished using FFT Analyzer with DEWESOFT software. The final results of CAE model and Experimental tested model are correlated. Keywords: Natural Frequency, Mode Shapes, FFT, FEA.

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15

Chikada, Y., M. Ishiguro, H. Hirabayashi, M. Morimoto, K. Morita, T. Kanzawa, H. Iwashita, et al. "A 6 × 320-MHz 1024-channel FFT cross-spectrum analyzer for radio astronomy." Proceedings of the IEEE 75, no. 9 (1987): 1203–10. http://dx.doi.org/10.1109/proc.1987.13873.

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16

Cawley, P., and L. G. Rigner. "Rapid Measurement of Modal Properties Using FFT Analyzers With Random Excitation." Journal of Vibration and Acoustics 108, no. 4 (October 1, 1986): 394–98. http://dx.doi.org/10.1115/1.3269361.

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The use of a Nyquist plot of the H2 (Syy/Sxy*) frequency response function estimates produced by an FFT based spectrum analyzer with random excitation to obtain modal amplitudes and hence modal constants has been investigated. It has been proved that, irrespective of the frequency resolution used, the H2 estimates always lie on the true modal circle so even at coarse frequency resolution, a circle fitted to these points gives accurate values of modal amplitude. The conventional H1 (Sxy/Sxx) estimates lie inside the true modal circle. Use of the H2 technique results in major savings in the testing time required for a modal survey, particularly when measurements are to be taken at many points on the test structure.

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17

Wang, Xiang Yi, Wei Wang, and Wei Min Chen. "Design of Power Harmonic Analyzer Based on LabVIEW and HHT." Applied Mechanics and Materials 291-294 (February 2013): 2522–26. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2522.

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For shortcomings and deficiencies of FFT and Wavelet Transform, Hilbert Huang Transform is used in power harmonic analysis, EMD method is applied to decompose these signals from the timescale of its characteristics to realize adaptive signal of the band, And then the characteristics of frequency and amplitude of each disturbance signal are extracted on the basis of Hilbert transform. Furthermore, the paper designed a data processing platform based on the integrated software LabVIEW and Matlab with NI PXI-1042 as the carrier. The system can analyze and process the power harmonic data in real-time with the calculation of HHT, compared with the traditional analyzer, with simple operation, processing ability, graphics output etc. Experiments have proved the stability, fast calculation capability, and high precision of the system.

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18

Yamauchi, Tomohiko. "Effectiveness of Newly-developed Portable FFT Analyzer for Acoustic & Vibration Analysis on Site." Journal of The Japan Institute of Marine Engineering 50, no. 2 (2015): 186–89. http://dx.doi.org/10.5988/jime.50.186.

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19

., Ramesh S. "EXPERIMENTAL MODAL ANALYSIS OF PASSENGER CAR ENGINE OIL PAN USING FEM AND FFT ANALYZER." International Journal of Research in Engineering and Technology 06, no. 03 (March 25, 2017): 1–5. http://dx.doi.org/10.15623/ijret.2017.0603001.

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20

., Nagappa Y. Tirlapur. "IMPLEMENTATION OF TURBOCHARGER ON SINGLE CYLINDER DIESEL ENGINE AND VIBRATION ANALYSIS USING FFT ANALYZER." International Journal of Research in Engineering and Technology 05, no. 09 (September 25, 2016): 64–70. http://dx.doi.org/10.15623/ijret.2016.0509009.

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21

Fleischmann, Patrick, Heinz Mathis, Jakub Kucera, and Stefan Dahinden. "Implementation of a Cross-Spectrum FFT Analyzer for a Phase-Noise Test System in a Low-Cost FPGA." International Journal of Microwave Science and Technology 2015 (September 17, 2015): 1–7. http://dx.doi.org/10.1155/2015/757591.

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The cross-correlation method allows phase-noise measurements of high-quality devices with very low noise levels, using reference sources with higher noise levels than the device under test. To implement this method, a phase-noise analyzer needs to compute the cross-spectral density, that is, the Fourier transform of the cross-correlation, of two time series over a wide frequency range, from fractions of Hz to tens of MHz. Furthermore, the analyzer requires a high dynamic range to accommodate the phase noise of high-quality oscillators that may fall off by more than 100 dB from close-in noise to the noise floor at large frequency offsets. This paper describes the efficient implementation of a cross-spectrum analyzer in a low-cost FPGA, as part of a modern phase-noise analyzer with very fast measurement time.

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22

Wakayama, Toshitaka, Toru Yoshizawa, and Yukitoshi Otani. "Spectroscopic Birefringence Mapping by Channeled Spectrum." Applied Mechanics and Materials 70 (August 2011): 452–57. http://dx.doi.org/10.4028/www.scientific.net/amm.70.452.

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Birefringence mapping of objects has attracted great interest in the fields of material technology and biomedical science. This paper describes spectroscopic birefringence mapping using a channeled spectrum. To perform spectroscopic birefringence mapping using a microscope, an acousto-optical tunable filter (AOTF) was employed as a spectrometer. The AOTF can select a specific wavelength from a white light source. The optical arrangement consists of a white light source, the AOTF, a polarizer, two retarders with high-order retardance, two objective lenses, an analyzer, and a CCD camera. The polarizer and the first retarder can modulate the polarization state and they function as polarizing optics, while the second retarder and the analyzer can analyze the polarization state and they function as analyzing optics. A sample is inserted between the polarizing and analyzing optics. Images obtained at a specific wavelength generate 128 data points at visible wavelengths. A channeled spectrum (i.e., the intensity distribution) can be generated from the images obtained. A Fourier spectrum can be obtained by the fast Fourier transform (FFT) method. The birefringence properties of the sample can be derived by calculating the inverse FFT. We used this technique to measure the polarization properties of a nematic liquid crystal droplet.

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23

Cawley, P. "The Accuracy of Frequency Response Function Measurements Using FFT-Based Analyzers With Transient Excitation." Journal of Vibration and Acoustics 108, no. 1 (January 1, 1986): 44–49. http://dx.doi.org/10.1115/1.3269302.

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The accuracy of the frequency response measurement obtained using impact excitation and a Fast Fourier Transform based spectrum analyzer has been investigated. It has been shown that with impact excitation, provided the impacts are reproducible and the extraneous noise level is low, the coherence estimates obtained from the analyzer are unity, irrespective of the frequency resolution employed. Hence the H1 (Sxy/Sxx) and H2 (Syy/Sxy*) frequency response function estimates are identical. However, these frequency response function estimates are affected by a bias error caused by inadequate frequency resolution so unity coherence does not necessarily imply accurate results. The results with impact excitation are compared with those obtained using random excitation where both the coherence and frequency response function estimates are affected by bias error. The bias error in the frequency response function estimates with impact excitation is intermediate between that in the H1 and H2 estimates when random excitation is used. The theoretical predictions have been verified by tests on an analogue computer and on a built-up structure.

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24

Hemour, Simon, Florence Podevin, and Pascal Xavier. "An RF spectrometer for fast wide band measurement." International Journal of Microwave and Wireless Technologies 1, no. 6 (December 2009): 537–42. http://dx.doi.org/10.1017/s1759078709990821.

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A new type of spectrum analyzer using RF interferometry is presented. The stationary wave integrated Fourier transform spectrometer is dedicated to the measurement of transient wideband signals. The spectrometer is mobile and cheap. It consists of spatial samplers placed along a waveguide ended by a short circuit. The standing wave caused by the short circuit is sampled and the spectrum is obtained by an FFT computation. A 0.3–5 GHz analyzer was built as a proof-of-principle demonstration and an application to RF dosimetry is shown.

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25

KASAI, Minoru, Atsushi HIBINO, and Haruki YASHIRO. "Identify of Vibration Damping Mechanisms of Porous Sintered Material by Frequency Response Function of FFT Analyzer." Journal of the Japan Society of Powder and Powder Metallurgy 60, no. 11 (2013): 475–81. http://dx.doi.org/10.2497/jjspm.60.475.

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26

Rangel-Magdaleno, Jose de Jesus, Rene de Jesus Romero-Troncoso, Roque Alfredo Osornio-Rios, Eduardo Cabal-Yepez, and Aurelio Dominguez-Gonzalez. "FPGA-Based Vibration Analyzer for Continuous CNC Machinery Monitoring With Fused FFT-DWT Signal Processing." IEEE Transactions on Instrumentation and Measurement 59, no. 12 (December 2010): 3184–94. http://dx.doi.org/10.1109/tim.2010.2047130.

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27

Survase, Ganesh, Suraj Sutar, Tushar and AkshayRajmane Pawar, and Akshay Rajmane. "STUDY & VIBRATION ANALYSIS OF WORM AND WORM WHEEL GEAR BOX BY USING FFT ANALYZER." International Journal of Mechanical, Robotics and Production Engineering VII, no. I (July 1, 2020): 34. http://dx.doi.org/10.30696/ijmpe.vii.i.2020.34-40.

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28

Betta, G., C. Liguori, A. Paolillo, and A. Pietrosanto. "A DSP-based FFT-analyzer for the fault diagnosis of rotating machine based on vibration analysis." IEEE Transactions on Instrumentation and Measurement 51, no. 6 (December 2002): 1316–22. http://dx.doi.org/10.1109/tim.2002.807987.

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29

KASAI, Minoru, and Atsushi HIBINO. "Analysis of Vibration Damping Mechanisms of Cu-Sn/Graphite Composite Material by Frequency Response Function of FFT Analyzer." Journal of the Japan Society of Powder and Powder Metallurgy 62, no. 10 (2015): 511–18. http://dx.doi.org/10.2497/jjspm.62.511.

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30

KASAI, Minoru, Fumitaka FUJITSUKA, and Atsushi HIBINO. "1003 Identify of vibration damping mechanisms of metal/ceramics composite material by Frequency Response Function of FFT analyzer." Proceedings of Conference of Hokuriku-Shinetsu Branch 2014.51 (2014): _1003–1_—_1003–2_. http://dx.doi.org/10.1299/jsmehs.2014.51._1003-1_.

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31

OHZAWA, Hirotaka, Syuntaro YAMAMOTO, and Atsushi HIBINO. "Vibration Damping Analysis of Cu-Sn/Carbon Fiber Sintered Composite Materials by Frequency Response Function of FFT Analyzer." Journal of the Japan Society of Powder and Powder Metallurgy 64, no. 7 (2017): 338–44. http://dx.doi.org/10.2497/jjspm.64.338.

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32

Sanchez-Gonzalez, Arturo, Nicolas Medrano, Belen Calvo, and Pedro A. Martinez. "A Multichannel FRA-Based Impedance Spectrometry Analyzer Based on a Low-Cost Multicore Microcontroller." Electronics 8, no. 1 (January 1, 2019): 38. http://dx.doi.org/10.3390/electronics8010038.

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Impedance spectrometry (IS) is a characterization technique in which a voltage or current signal is applied to a sample under test to measure its electrical behavior over a determined frequency range, obtaining its complex characteristic impedance. Frequency Response Analyzer (FRA) is an IS technique based on Phase Sensitive Detection (PSD) to extract the real and imaginary response of the sample at each input signal, which presents advantages compared to FFT-based (Fast Fourier Transform) algorithms in terms of complexity and speed. Parallelization of this technique has proven pivotal in multi-sample characterization, reducing the instrumentation size and speeding up analysis processes in, e.g., biotechnological or chemical applications. This work presents a multichannel FRA-based IS system developed on a low-cost multicore microcontroller platform which both generates the required excitation signals and acquires and processes the output sensor data with a minimum number of external passive components, providing accurate impedance measurements. With a suitable configuration, the use of this multicore solution allows characterizing several impedance samples in parallel, reducing the measurement time. In addition, the proposed architecture is easily scalable.

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33

Tonnesen, J., and J. W. Lund. "Impact Excitation Tests to Determine the Influence Coefficients for Balancing Lightly Damped Rotors." Journal of Engineering for Gas Turbines and Power 110, no. 4 (October 1, 1988): 600–604. http://dx.doi.org/10.1115/1.3240177.

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Experiments have been conducted to evaluate a supplementary method for balancing lightly damped rotors. The rotor, while running, is excited by an impact generator, and the response is measured at the bearings by transducers for displacement, force, and acceleration. An FFT analyzer is employed to obtain the frequency-dependent transfer functions from which the corresponding influence coefficients can be calculated. The results are compared with the values obtained from the conventional trial weight method, and they are also used in a successful balancing of the rotor.

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34

Avitabile, Pete. "MODAL SPACE: A Reference DOF is Needed for all Modal Software Systems. Why is the FFT Analyzer Reference Different?" Experimental Techniques 32, no. 2 (March 2008): 9–10. http://dx.doi.org/10.1111/j.1747-1567.2008.00329.x.

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35

Qin, Bai, Jun Peng Shao, Bo Zhang, Yan Ni, Yan Jiang Zhao, Gui Hua Han, and Yan Qin Zhang. "Research on Simulation Optimization and Experiment of Dynamical Vibration Absorption Boring Bar with Damping." Key Engineering Materials 419-420 (October 2009): 749–52. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.749.

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The build-in dynamical vibration absorption system with damping is applied to increase the dynamic stiffness of a boring bar. According to construction and vibration features, multi flexible body dynamical model of the vibration absorption system is built up by using the software of ADAMS and ANSYS. Also the vibration characteristic of an actual boring bar is analyzed by using SA-78 2ch FFT analyzer. Through the analysis of simulation results and experimental data the accuracy of the model is validated. On this basis the influence of the radial stiffness coefficient of rubber brushes, the damping coefficient of damping fluid and the mass of heavy turning body on the vibration system is discussed by using the vibration analyses module of ADAMS. The simulation results verify the feasibility of the initial structure design; establish the design key points in the actual design. The multi flexible body dynamical model of the vibration absorption system has been simulated, optimized and analyzed. And optimized parameters are obtained finally. With these optimized parameters, actual dynamical vibration absorption boring bar with damping can be designed, and the dynamic stability of the bar is enhanced thereby.

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36

YAMAMOTO, Shunntaro, Nakano WATARU, and Atsushi HIBINO. "Effect of microstructure on vibration damping behavior of Al-Si based sintered materials by frequency response function of FFT analyzer." Proceedings of Conference of Hokuriku-Shinetsu Branch 2018.55 (2018): A012. http://dx.doi.org/10.1299/jsmehs.2018.55.a012.

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37

Fakhfakh, Leila, Slim Abid, and Anis Ammous. "Measurements and Modeling of Conducted EMI in a Buck Chopper." Advanced Materials Research 324 (August 2011): 419–22. http://dx.doi.org/10.4028/www.scientific.net/amr.324.419.

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The high increase of power electronic devices use (speed control, lighting, heating, automotive, etc...) requires the electrical, thermal and electromagnetic behavior studies. In this paper we developed a model to predict the conducted EMI level in a DC/DC converter. Measurement methodology was done using a network analyzer in order to evaluate the equivalent impedance model of each converter element. The full circuit model is then implemented in the Saber® simulation tool using time domain simulation followed by fast Fourier transformation (FFT) in the frequency range 150 KHz -100 MHz. A comparison between simulation results and those obtained by measurements is used to validate the developed model.

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38

KISHIMOTO, Kikuo, Masaaki KURODA, Shigeru AOKI, and Masaru SAKATA. "A measuring system for dynamic stress intensity factors using a FFT analyzer - Application to drop weight impact three point bend testing." Journal of the Society of Materials Science, Japan 35, no. 395 (1986): 850–53. http://dx.doi.org/10.2472/jsms.35.850.

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39

Maeda, Toshiyuki. "An algorithm for calculation of material loss factors using single degree of freedom method and digital data measured by FFT analyzer." Journal of the Acoustical Society of America 103, no. 5 (May 1998): 2929. http://dx.doi.org/10.1121/1.422147.

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40

Kumar, Dhotre Pavan, and Chikkol V. Srinivasa. "Modal Characterization of Sandwich Skew Plates." Acta Mechanica et Automatica 15, no. 3 (September 1, 2021): 143–53. http://dx.doi.org/10.2478/ama-2021-0019.

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Abstract The current work focuses on the experimental and finite element free vibration studies of laminated composite sandwich skew plates. The comparison was made between the experimental values obtained by the Fast Fourier transform (FFT) analyzer and a finite element solution obtained from CQUAD8 finite element of The MacNeal-Schwendler Corporation (MSC) / NASA STRucture Analysis (NASTRAN) software. The influence of parameters such as aspect ratio (AR) (a/b), skew angle (α), edge condition, laminate stacking sequence, and fiber orientation angle (θ°) on the natural frequencies of sandwich skew plates was studied. The values obtained by both the finite element and experiment approaches are in good agreement. The natural frequencies increase with an increase in the skew angle for all given ARs.

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41

Nasaruddin, M. A., Mohd Kameil Abdul Hamid, Ahmad Razimi Mat Lazim, and Abd Rahim Abu Bakar. "Effects of External Hard Particles on Brake Noise of Disc Braking System." Applied Mechanics and Materials 388 (August 2013): 213–16. http://dx.doi.org/10.4028/www.scientific.net/amm.388.213.

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The open design and position of disc brake that is closed to road surfaces enable contaminants to enter the brake gap and caused noise and tribological disturbance at the brake interface. Contaminants such as dirt and soil can be present and are expected to influence the occurrence of brake squeal that produce an annoying sound during braking action. The objective of this study was to examine the effect of external hard particles at different disc sliding speed on generation of brake squeal using a brake dynamometer. Different rotational speed of disc brake was selected and the experiments squeal noise data was collected and analyzed using the Fast Fourier Transformation (FFT) analyzer. From the experiments, the presence of external particle and the rotation speed of disc brake promotes the generation of brake squeal phenomenon by changing the surface roughness and effective contact of brake interface. Results obtained from the experiment also showed that higher rotating disc generate higher sound level meter or squeal frequency and increase numbers of squeal noise generated.

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42

KASAI, Minoru, Fumitaka FUJITSUKA, and Atsushi HIBINO. "Analysis of Vibration Damping Mechanisms of Cu-Sn/Al₂O₃Composite Material by Frequency Response Function of FFT Analyzer." Journal of the Japan Society of Powder and Powder Metallurgy 62, no. 8 (2015): 400–407. http://dx.doi.org/10.2497/jjspm.62.400.

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43

Gajbhiye, Sachin O., and Satinder P. Singh. "Experimental Investigation of Static and Dynamic Characteristics of Multiwall Carbon Nanotubes Reinforced Polypropylene." Applied Mechanics and Materials 592-594 (July 2014): 927–31. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.927.

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The change in static and dynamic characteristics of polypropylene (PP) of grade H110MA by adding 2% multi walled carbon nanotubes (MWCNT) was investigated experimentally in this paper. The nanocomposite material is prepared by mixing neat PP and MWCNT in an extruder in a specified proportion. The extruded material is then used in an injection molding machine to make tensile test and impact test specimen. Tensile test specimen is tested on universal testing machine (UTM) to check the Young’s modulus of nanocomposite material. The impact test specimen is used to find the dynamic characteristics of this material by using the technique of experimental modal analysis using Single point Laser Doppler Vibrometer (SLDV), modal hammer and FFT analyzer. The scanning electron microscopic (SEM) images were taken to check the orientation and dispersion of carbon nanotubes in polypropylene.

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44

Karthik, K., R. Rohith Renish, I. Irfan Ahmed, and T. Niruban Projoth. "Free Vibration Test for Damping Characteristics of Hybrid Polyester Matrix Composite with Carbon Particles." Nano Hybrids and Composites 11 (October 2016): 1–6. http://dx.doi.org/10.4028/www.scientific.net/nhc.11.1.

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In this research aims to study the damping characteristics of hybrid polymer composite, which can be used in engineering structures and in many other applications. Hybrid composites are namely Glass fiber and carbon filler reinforced with polyester and epoxy matrix have been prepared by vacuum bag molding fabrication technique. Then the free vibration test were conducted using FFT analyzer with Lab VIEW software. The damping ratio and natural frequency were investigated for fabricated composites. Then through ANSYS, the mode shapes and natural frequencies were determined and the results were compared with experimental results. The damping ratio increases with increased volume fractions of E-glass fibers for both the types of polymer composites. Vibrations are concerned to large structures such as aircraft, as well as small structures such as electronic equipments.

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Barzegar, Ramin, Mehran Mahboubkhah, and Mir Mohammad Ettefagh. "A Study on Modal Parameters of Cylindrical Grinding Machine Structure through Experimental Test and FEM." Applied Mechanics and Materials 307 (February 2013): 275–78. http://dx.doi.org/10.4028/www.scientific.net/amm.307.275.

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Machine tool vibrations have great impact on machining process. Dynamic parameters such as the modal frequencies and damping constant of their components are the essential technical information required in engineering analysis and design. In addition, this information is needed for numerical simulations and finite element modeling to predict the response of the structures to a variety of dynamic loadings. In this work, experimental modal testing of a cylindrical grinding machine has been performed to obtain the mode shapes and modal frequencies. A Fast Fourier Transform (FFT) Analyzer, Pulse lab shop was used to obtain the Frequency Response Functions (FRF) and subsequent extraction of modal data was performed using Me’scope modal analysis software. These modal parameters were then checked using finite element analysis software, Ansys which were found to comply with the experimental results

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Same, Mohammad Hossein, Gabriel Gandubert, Gabriel Gleeton, Preslav Ivanov, and René Landry. "Simplified Welch Algorithm for Spectrum Monitoring." Applied Sciences 11, no. 1 (December 24, 2020): 86. http://dx.doi.org/10.3390/app11010086.

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Power Spectral Density (PSD) is an essential representation of the signal spectrum that depicts the power measurement content versus frequency. PSD is typically used to characterize broadband random signals and has a variety of usages in many fields like physics, engineering, biomedical, etc. This paper proposes a simple and practical method to estimate the PSD based on the Welch algorithm for spectrum monitoring. The proposed method can be easily implemented in most of software-based systems or low-level Field-Programmable Gate Arrays (FPGAs) and yields a smooth overview of the spectrum. The original Welch method utilizes the average of the amplitude squared of the previous Fast Fourier Transform (FFT) samples for better estimation of frequency components and noise reduction. Replacing the simple moving average with a weighted moving average can significantly reduce the complexity of the Welch’s method. In this way, the amount of required Random Access Memory (RAM) is reduced from K (where K is the number of FFT packets in averaging) to one. This new method allows users to adjust the dependency of the PSD on the previous observed FFTs and its smoothness by setting only one feedback parameter without any hardware change. The obtained results show that the algorithm gives a clear spectrum, even in the noisy situation because of the significant Signal to Noise Ratio (SNR) enhancement. The trade-off between spectrum accuracy and time convergence of the modified algorithm is also fully analysed. In addition, a simple solution based on Xilinx Intellectual Property (IP), which converts the proposed method to a practical spectrum analyzer device, is presented. This modified algorithm is validated by comparing it with two standard and reliable spectrum analyzers, Rohde & Schwarz (R&S) and Tektronix RSA600. The modified design can track any signal type as the other spectrum analyzers, and it has better performance in situations where the power of the desired signal is weak or where the signal is mixed with the background noise. It can display the spectrum when the input signal power is 5 dB lower than the visible threshold level of R&S and Tektronix. In both narrowband and wideband scenarios, the new implemented design can still display frequency components 5 dB higher than the noise, while the output spectrum of other analyzers is completely covered by noise.

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MAKINAGA, Goichi, Hideki KONDO, Naoya OCHI, Kishio MATSUMURA, Keiji AKASHI, Tatsuyuki FURUKAWA, Yosho TEI, Shigemi TANAKA, Ziro KANEKO, and Tsuyoshi NISHIMURA. "A New Automatic Analysis System for Continuous and Simultaneous Monitoring of Cerebral Blood Flow Velocity, Using the Doppler Wave Probe with an FFT Analyzer." Neurosonology 6, no. 2 (1993): 59–63. http://dx.doi.org/10.2301/neurosonology.6.59.

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Krishnan, Padmanabhan, and K. K. Manchit Kumar. "A Comparison of the Vibrational Responses of Four Different Uniform and Tapered Composite Beams." International Journal of Surface Engineering and Interdisciplinary Materials Science 6, no. 1 (January 2018): 44–58. http://dx.doi.org/10.4018/ijseims.2018010104.

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A combined experimental and finite element approach was used to compare the vibrational response of the composite beams with different configurations of internal taper and uniform cross sections. Composite beams were made using the hand lay-up process. Glass fibre was used as reinforcement in the form of a bidirectional fabric and a general-purpose epoxy resin as the matrix for the composite material. Experimental dynamic tests were carried out on FFT analyzer using specimens with different taper configurations. From the results, the effect of different taper configurations on the flexural natural frequencies and mode shapes was investigated. Finite element analysis of the same problem was carried out on software package ANSYS and the results were validated using the experimental results. From the results, a thorough comparison was made between the natural frequencies, loss factors, displacements and mode shapes of the specimens with different taper configurations and uniform cross sections considered. The aerospace implications are provided.

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Samanta, Nirmalya, and Hrilina Ghosh. "High Performance Nanostructured Silicon Oxide Impedance Biosensor System with Online Noise Spectroscopy Analysis." Advanced Materials Research 1064 (December 2014): 191–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1064.191.

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In this paper, noise spectroscopy has been reported earlier as an efficient tool for enhancing the selectivity of biosensors and the analysis was carried out by desktop spectrum analyzer. There were no reports, however, on the efficacy of this method in complex mixture. We have performed here for the first time, noise spectroscopy analysis on complex mixture of food toxin samples and observed that the first cut-off frequencies are indicative of the fact whether the solution has only specific antigen, mixture of specific and nonspecific antigen or no specific antigen at all. To realize a portable immunosensor, we have developed an electronic interface using digital signal processor (DSP) chip of Microchip Technology which has the embedded Fast Fourier Transform (FFT) algorithm for computation of noise spectrum. The entire system has been successfully demonstrated to detect 0.1 fg/ml aflatoxin B1 (AfB1) from a complex mixture with as high as 1000ng/ml non-specific toxins.

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Morgan, Darrell D., and Anthony G. Moss. "The Effects of Cigarette Smoke on Porcine Airway Epithelium." Microscopy and Microanalysis 4, S2 (July 1998): 1076–77. http://dx.doi.org/10.1017/s1431927600025502.

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Cephalad pulmonary mucociliary clearance driven by cilia of the ciliated airway epithelium provides probably the most important line of defense against inhaled toxins and particulate material for organs of the thoracic cavity. We demonstrate the reorganization of the cytoskeleton and the endoplasmic reticulum of airway epithelial cells upon cigarette smoke inhalation by employing DIC, LSCM, TEM and widefield fluorescence microscopy and have correlated this reorganization to changes in ciliary beat frequency (CBF) via FFT analysis. Neonatal pigs were used to provided healthy tracheal epithelial tissue. Exposure to cigarette smoke causes rapid ultrastructural changes including: ciliary distortion and detachment, ciliary abscission and severe alteration in endoplasmic reticulum structure suggesting profound disruption of essential membrane-cytoskeletal linkages.To examine changes in CBF we describe a simple approach, using a laser scanning confocal microscope (LSCM) and an analog-to-digital computer converter/analyzer for the acquisition of data from biological systems that undergo rapid periodic movement, such as ciliary motion.

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