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Journal articles on the topic 'Frequency response characteristics'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

MOHTADI, C., S. L. SHAH, and D. G. FISHER. "Frequency response characteristics of MIMO GPC†." International Journal of Control 55, no. 4 (April 1992): 877–900. http://dx.doi.org/10.1080/00207179208934264.

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2

Birlasekaran, S., and Yu Jianhong. "Frequency response characteristics of gas sensors." Measurement 26, no. 4 (December 1999): 229–47. http://dx.doi.org/10.1016/s0263-2241(99)00043-3.

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3

Tian, Feng, Fei Sun, and Xinyu Chen. "Avionics Frequency Response Characteristics Testing System." International Journal of Hybrid Information Technology 9, no. 12 (December 31, 2016): 299–308. http://dx.doi.org/10.14257/ijhit.2016.9.12.27.

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4

Keidser, Gitte, Harvey Dillon, and Denis Byrne. "Candidates for Multiple Frequency Response Characteristics." Ear and Hearing 16, no. 6 (December 1995): 562–74. http://dx.doi.org/10.1097/00003446-199512000-00003.

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5

Choi, Jong-Hyuk, and Bok-Hee Lee. "Frequency Response Characteristics of a Grounding Grid." Journal of the Korean Institute of Illuminating and Electrical Installation Engineers 30, no. 5 (May 31, 2016): 66. http://dx.doi.org/10.5207/jieie.2016.30.5.066.

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6

Sanyal, Sucharita. "Frequency response characteristics of a birefringent lens." Optical Engineering 41, no. 3 (March 1, 2002): 592. http://dx.doi.org/10.1117/1.1430420.

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7

Melcer, Jozef, and Daniela Kuchárová. "Frequency Response Functions of a Lorry." Advanced Materials Research 969 (June 2014): 188–91. http://dx.doi.org/10.4028/www.scientific.net/amr.969.188.

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There are characteristics which uniquely determine the dynamic individuality of every dynamical system. The frequency response functions can by considered as such characteristics. They are employed usually within the solution in frequency domain. These characteristics can be obtained by the numerical or experimental way. In the submitted paper the frequency response functions are analyzed for the lorry Tatra by numerical way. They are needed within the numerical analysis of moving load effect on pavement in the frequency domain.

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8

Yeom, Keong-Tae, Kwan-Kyu Kim, Do-Geun Heh, and Yong-Kab Kim. "Analysis of Frequency Response Characteristics in Optical Microphone." Journal of the Korea Contents Association 8, no. 6 (June 28, 2008): 8–15. http://dx.doi.org/10.5392/jkca.2008.8.6.008.

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9

Shi, Zhan, Ryo Kikuuwe, and Motoji Yamamoto. "1P1-P05 Frequency Response Characteristics of Parabolic Sliding Mode Filters(New Control Theory and Motion Control (1))." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2014 (2014): _1P1—P05_1—_1P1—P05_3. http://dx.doi.org/10.1299/jsmermd.2014._1p1-p05_1.

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10

Yang, Baozhong, and C. Steve Suh. "On the Characteristics of Bifurcation and Nonlinear Dynamic Response." Journal of Vibration and Acoustics 126, no. 4 (October 1, 2004): 574–79. http://dx.doi.org/10.1115/1.1805007.

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Spectral analysis has been widely applied to the detection of bifurcation and the determination of the extent to which dynamic instability and chaotic responses develop. However, because spectral analysis employs stationary sinusoids in representing time-varying signals of inherent nonlinearity, the use of Fourier domain methodologies would inexorably risk misinterpreting the true characteristics and obscuring the underlying physics of the nonlinear system being investigated. The fact that the amplitude and frequency of all the individual spectral component of a nonlinear, nonstationary dynamic response are modulated and coupled in time necessarily implies that, if the inception and transition of a bifurcated state of unstable motion is to be fully characterized, amplitude modulation and frequency modulation need to be temporally decoupled. The fundamental notion of instantaneous frequency defines frequency as the temporal gradient of phase and thus provides a powerful mechanism through which amplitude modulation and frequency modulation can be disassociated. Results of applying instantaneous frequency to the characterization of bifurcation and evolution of instability for a cracked rotor also indicate that instantaneous frequency interprets nonlinear rotary responses with sound physical bases.

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11

Isaev, Alexander E., and Bulat I. Khatamtaev. "Determination of the hydrophone phase-frequency response by its amplitude-frequency response." Izmeritel`naya Tekhnika, no. 7 (2021): 48–53. http://dx.doi.org/10.32446/0368-1025it.2021-7-48-53.

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One of the tasks of the COOMET 786/RU/19 pilot comparisons is to check the correctness of the hydrophone model proposed in VNIIFTRI, consisting of an advance line and a minimum-phase part, including the effect of sound diffraction and resonance properties of the active element. This model makes it possible to use the Hilbert transform to obtain the phase-frequency response from the amplitude-frequency response as well as for inverse operation. The results of measuring experiments performed using facilities of the State Primary Standard GET 55-2017 are presented. For many practical tasks, it is not necessary to obtain the phase-frequency response for an acoustic center of the receiver. It is enough to determine the shape of the phase-frequency response using much less laborious methods. The question of which of the characteristics is expedient to determine during calibration - for an acoustic center, or for a point on the surface of an active element, deserves a discussion among specialists performing acoustic measurements.

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12

Drieberg, Micheal, and Nirod Chandra Sahoo. "On Resonance and Frequency Response Characteristics of Electrical Circuits." International Journal of Electrical Engineering & Education 50, no. 4 (October 2013): 368–83. http://dx.doi.org/10.7227/ijeee.50.4.3.

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13

Pandey, Anshuman, and James W. Gregory. "Frequency-Response Characteristics of Polymer/Ceramic Pressure-Sensitive Paint." AIAA Journal 54, no. 1 (January 2016): 174–85. http://dx.doi.org/10.2514/1.j054166.

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14

Tyazhev, A. I. "Adaptive digital corrector for channel amplitude-frequency response characteristics." Infokommunikacionnye tehnologii 14, no. 2 (June 2016): 188–91. http://dx.doi.org/10.18469/ikt.2016.14.2.13.

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15

Wang, Wei Wei. "Time and frequency response characteristics of bacteriorhodopsin-based photodetectors." Optical Engineering 45, no. 8 (August 1, 2006): 084001. http://dx.doi.org/10.1117/1.2335888.

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16

Ohigashi, Hiroji, Toru Itoh, Kuniko Kimura, Toshiharu Nakanishi, and Miyo Suzuki. "Analysis of Frequency Response Characteristics of Polymer Ultrasonic Transducers." Japanese Journal of Applied Physics 27, Part 1, No. 3 (March 20, 1988): 354–60. http://dx.doi.org/10.1143/jjap.27.354.

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17

Alhargan, F. A., and S. R. Judah. "Frequency response characteristics of the multiport planar elliptic patch." IEEE Transactions on Microwave Theory and Techniques 40, no. 8 (1992): 1726–30. http://dx.doi.org/10.1109/22.149519.

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18

Papic, I., and A. M. Gole. "Frequency response characteristics of the unified power flow controller." IEEE Transactions on Power Delivery 18, no. 4 (October 2003): 1394–402. http://dx.doi.org/10.1109/tpwrd.2003.817729.

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19

Wang, F., and M. H. J. Bollen. "Frequency-Response Characteristics and Error Estimation in RMS Measurement." IEEE Transactions on Power Delivery 19, no. 4 (October 2004): 1569–78. http://dx.doi.org/10.1109/tpwrd.2004.835280.

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20

Papic, I., and A. M. Gole. "Frequency Response Characteristics of the Unifled Power Flow Controller." IEEE Power Engineering Review 22, no. 12 (December 2002): 65. http://dx.doi.org/10.1109/mper.2002.4311935.

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21

Comparin, R. J., and R. Singh. "Non-linear frequency response characteristics of an impact pair." Journal of Sound and Vibration 134, no. 2 (October 1989): 259–90. http://dx.doi.org/10.1016/0022-460x(89)90652-4.

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22

Dinu, C., D. E. Beasley, and R. S. Figliola. "Frequency Response Characteristics of an Active Heat Flux Gage." Journal of Heat Transfer 120, no. 3 (August 1, 1998): 577–82. http://dx.doi.org/10.1115/1.2824314.

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The transient response and frequency response of a constant-temperature platinum film gage are computationally modeled for application to heat flux measurement. The probe consists of a thin platinum film (sensor) deposited on a Pyrex substrate, and coated with aluminum oxide. The probe is exposed to a convective environment, and the power required to maintain the sensor at a constant temperature is a direct indication of the local, instantaneous heat transfer rate. In application, the probe is mounted in a heated, high thermal conductivity material, creating an isothermal heat transfer surface. A two-dimensional numerical model was developed to represent the sensor, the Pyrex substrate and the coating. Ideally, the probe would be operated with the platinum at identically the same temperature as the isothermal surface. In the present study, the effects of non-ideal operating conditions, resulting in differences between the sensor and surface temperature, are examined. Frequency response characteristics are presented in a nondimensional form. The results of this modeling effort clearly indicate the importance of precise control over the sensor temperature in employing the present method for heat flux measurement. With the sensor temperature equal to the isothermal surface temperature, the probe calibration is insensitive to the heat transfer rate over a wide range of heat transfer coefficients. However, a 0.5°C difference between the sensor and surface temperatures yields a change in the calibration of approximately 20 percent over a range of heat transfer coefficient of 500 W/m2K. At an input frequency of 10 Hz and an average heat transfer coefficient of 175 W/m2K, amplitude errors increase from 3 percent to 35 percent as the temperature difference changes from zero to 1°C. These results are useful guide to calibration, operation, and data reduction in active heat flux measurement.

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23

Ohigashi, H., T. Itoh, K. Kimura, T. Nakanishi, and M. Suzuki. "Analysis of frequency response characteristics of polymer ultrasonic transducers." NDT & E International 25, no. 3 (1992): 155. http://dx.doi.org/10.1016/0963-8695(92)90456-q.

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24

Lin, Huan, and Leihou Sun. "Vibration responses characteristics of a Ginkgo biloba tree excited under harmonic excitation." PLOS ONE 16, no. 8 (August 20, 2021): e0256492. http://dx.doi.org/10.1371/journal.pone.0256492.

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The most effective method of the fruit harvesting is the mechanical harvest. The frequency spectrum of different testing positions on a Ginkgo biloba tree under the impact excitation was tested in the laboratory. The acceleration responses under the harmonic excitation were measured at the frequency of the peak and trough points in the frequency spectrum curves. Results of this research indicate that the frequency spectrum presented the consistency on the same branch but distinction among different branches. There was a correspondence between the frequency spectrum characteristics and the vibration responses. The vibration responses could be strengthened at the resonant frequency. Merely, the acceleration responses at low frequency were very weak. At higher frequency, the vibration responses were strong but presented different characteristics among different branches. The acceleration response on the trunk was always the weakest. On the same branch, the dynamic responses presented the similar characteristics and the acceleration amplitude increased gradually as the testing position was located away from the excitation point on the trunk. Among different branches, the strongest dynamic response appeared at different frequencies. Our results indicate that it was difficult to induce the strong vibration response of all the branches at the single frequency during the practical mechanical harvesting of fruits.

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25

Su, Xunwen, Dongmei Zhu, Chao Zheng, and Mileta M. Tomovic. "Frequency response characteristics of finite periodic chiral structures with three ligaments." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 12 (February 2019): 4623–34. http://dx.doi.org/10.1177/0954410019827170.

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The frequency response model of the chiral structure with three ligaments is built using finite element method. By the unit harmonic excitation force, the displacement responses of the point of applying unit force and a point far away from that point are obtained. The effects of different geometric parameters and the filler in the nodes on the response characteristics under medium–low frequency are studied. The results indicate that the node radius, ligament thickness, and ligament length have significant effects on the frequency response characteristics of the chiral structure with three ligaments. The starting frequency and the gap width of the frequency gap can be adjusted by changing the node radius of the limited periodic chiral structure. The filler in the nodes can change the starting frequency and width of the frequency gap. Hence, the narrow band gap under low frequency is obtained. When the frequency of the vibration is in the band gap, the chiral structure with the three ligaments has good attenuation characteristics. The results of this paper can provide the references for the design of chiral structure in the aeronautic and aerospace engineering.

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26

GOWRISANKARAN, SOWJANYA, J. JASON McANANY, and KENNETH R. ALEXANDER. "Poststimulus response characteristics of the human cone flicker electroretinogram." Visual Neuroscience 30, no. 4 (July 2013): 147–52. http://dx.doi.org/10.1017/s0952523813000333.

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AbstractAt certain temporal frequencies, the human cone flicker electroretinogram (ERG) contains multiple additional responses following the termination of a flicker train. The purpose of this study was to determine whether these poststimulus responses are a continuing response to the terminated flicker train or represent the oscillation of a resonant system. ERGs were recorded from 10 visually normal adults in response to full-field sinusoidally modulated flicker trains presented against a short-wavelength rod-saturating adapting field. The amplitude and timing properties of the poststimulus responses were evaluated within the context of a model of a second-order resonant system. At stimulus frequencies between 41.7 and 71.4 Hz, the majority of subjects showed at least three additional ERG responses following the termination of the flicker train. The interval between the poststimulus responses was approximately constant across stimulus frequency, with a mean of 14.4 ms, corresponding to a frequency of 69.4 Hz. The amplitude and timing characteristics of the poststimulus ERG responses were well described by an underdamped second-order system with a resonance frequency of 70.3 Hz. The observed poststimulus ERG responses may represent resonant oscillations of retinal ON bipolar cells, as has been proposed for electrophysiological recordings of poststimulus responses from retinal ganglion cells. However, further investigation is required to determine the types of retinal neurons involved in the generation of the poststimulus responses of the human flicker ERG.

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27

Urata, Eizo. "The frequency response of rectangular ducts." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 6 (July 1, 2014): 1103–11. http://dx.doi.org/10.1177/0954406214542037.

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This article considers the oscillatory laminar flow of an incompressible fluid in a rectangular duct and expresses the flow rate due to an oscillatory pressure gradient using a frequency transfer function. For the description of the frequency characteristics, selection of a reference length suitable to the duct cross section is important. The selected reference length in this article is the radius of a circular tube whose flow rate is equal to that of the rectangular duct when the fluids are the same, and applied steady pressure gradients are the same. This reference length makes it easier to distinguish changes in the dynamic characteristics due to magnitude variation of duct cross sections from those due to shape variation of the duct cross sections. Numerical investigation of the exact transfer function reveals that a first-order system accurately approximates the transfer function. The aspect ratio of the rectangle determines the cut-off frequency of the first-order system.

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28

Gioanni, Henri, Annie Sansonetti, and Mohamed Bennis. "Characteristics of cervico-ocular responses in the chameleon." Visual Neuroscience 14, no. 6 (November 1997): 1175–84. http://dx.doi.org/10.1017/s095252380001186x.

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AbstractThe cervico-ocular reflex (COR) was investigated in the chameleon. Two kinds of responses were observed by oscillating the body (sine-wave stimuli) in the fixed-head animal: a "smooth response" of very low gain (around 0.08) and a saccadic response composed of 1–12 saccades per cycle of stimulation (depending on the stimulation frequency). Both responses were elicited in the compensatory direction (same direction as the stimulation) and exhibited a frequency dependence with low-pass properties. The saccadic response was especially developed and displayed a higher gain (up to 0.4) than the smooth response. In darkness, the saccades were triggered near the zero point (head-body alignment), whereas in the presence of a fixed visual surround they were elicited more regularly throughout the stimulation cycle. The amplitude of saccades was increased in the light. Consequently, the gain and the phase lag of the saccadic reponse were enhanced by the visual input. No visuo-cervical interaction was observed for the smooth response. Oscillating the body at a constant velocity (seesaw or ramp stimuli) revealed a frequency effect on the number of saccades (during a cycle of stimulation), but not on the gain of the response. Increasing the amplitude of oscillations augmented only very slightly the amplitude of saccades and consequently decreased the gain. Hence, the best working range of the saccadic response corresponds to body or head movements of low amplitude (up to ±20 deg) and low frequency (up to 0.25 Hz), and is improved by a visual input. These properties are discussed on a comparative point of view. It is proposed that, in chameleons, the saccadic response could contribute to gaze stabilization and add to the vestibulo-ocular and the optokinetic responses.

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29

Ying, Zu-Guang, and Yi-Qing Ni. "Vibrational Amplitude Frequency Characteristics Analysis of a Controlled Nonlinear Meso-Scale Beam." Actuators 10, no. 8 (August 3, 2021): 180. http://dx.doi.org/10.3390/act10080180.

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Vibration response and amplitude frequency characteristics of a controlled nonlinear meso-scale beam under periodic loading are studied. A method including a general analytical expression for harmonic balance solution to periodic vibration and an updated cycle iteration algorithm for amplitude frequency relation of periodic response is developed. A vibration equation with the general expression of nonlinear terms for periodic response is derived and a general analytical expression for harmonic balance solution is obtained. An updated cycle iteration procedure is proposed to obtain amplitude frequency relation. Periodic vibration response with various frequencies can be calculated uniformly using the method. The method can take into account the effect of higher harmonic components on vibration response, and it is applicable to various periodic vibration analyses including principal resonance, super-harmonic resonance, and multiple stationary responses. Numerical results demonstrate that the developed method has good convergence and accuracy. The response amplitude should be determined by the periodic solution with multiple harmonic terms instead of only the first harmonic term. The damping effect on response illustrates that vibration responses of the nonlinear meso beam can be reduced by feedback control with certain damping gain. The amplitude frequency characteristics including anti-resonance and resonant response variation have potential application to the vibration control design of nonlinear meso-scale structure systems.

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30

Smith, D. I., and J. H. Mills. "Low-frequency component of the gerbil brainstem response: Response characteristics and anesthesia effects." Hearing Research 54, no. 1 (July 1991): 1–10. http://dx.doi.org/10.1016/0378-5955(91)90130-2.

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31

Noskov, Vladyslav Ya, Kirill A. Ignatkov, and Kirill D. Shaidurov. "Dynamic characteristics of frequency-locked autodynes." ITM Web of Conferences 30 (2019): 12009. http://dx.doi.org/10.1051/itmconf/20193012009.

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The results of research into the dynamic characteristics of microwave oscillators under the influence of both their own reflected radiation and external synchronising effect are presented. The basic relations for the analysis of signals during fast movement of the target are obtained, when the signal period is comparable to the autodyne response time constants. The results of numerical modelling of the characteristics are confirmed by the experimental data obtained on the example of an oscillator based on the Gunn diode of the 8-mm range.

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32

Stauss, Harald M., Erling A. Anderson, William G. Haynes, and Kevin C. Kregel. "Frequency response characteristics of sympathetically mediated vasomotor waves in humans." American Journal of Physiology-Heart and Circulatory Physiology 274, no. 4 (April 1, 1998): H1277—H1283. http://dx.doi.org/10.1152/ajpheart.1998.274.4.h1277.

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In a recent study, we demonstrated that transmission from peripheral sympathetic nerves to vascular smooth muscles is strongest in the frequency band from 0.2 to 0.5 Hz in conscious rats. In contrast, sympathetic modulation of vasomotor tone in humans is suggested to be reflected in the power spectrum of arterial blood pressure in a frequency range centered around ∼0.1 Hz. Therefore, we addressed whether frequency response characteristics of sympathetic transmission from peripheral sympathetic nerves to vascular smooth muscles in humans differ from those in rats. In 12 male subjects, skin-sympathetic fibers of the left median nerve were electrically stimulated via microneurography needles with stimulation frequencies ranging from 0.01 to 0.5 Hz. Simultaneously, blood flow in the innervated skin area at the palm of the ipsilateral hand was recorded by a laser-Doppler device. The skin blood flow in the same area of the contralateral hand was recorded as a control. Median nerve stimulation produced transient decreases in skin blood flow in the ipsilateral hand. At frequencies ranging from 0.025 to 0.10 Hz, median nerve stimulation evoked high-power peaks at the same frequencies in the skin blood flow power spectra of the ipsilateral but not of the contralateral hand. The greatest responses were found in the frequency range from 0.075 to 0.10 Hz. Therefore, these data indicate that the transmission from peripheral sympathetic nerves to cutaneous vascular smooth muscles in humans is slower than in rats. In addition, the frequency range believed to be most important in sympathetic modulation of vasomotor activity in humans corresponds to the frequency band of the greatest response of cutaneous vascular smooth muscle contraction to sympathetic nerve stimulation.

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33

Guan, Fuwang, Hong Xiao, Meiwu Shi, and Fumei Wang. "The frequency response characteristics of planar frequency selective fabrics (FSFs) with cross-shaped units." Textile Research Journal 86, no. 20 (July 21, 2016): 2169–78. http://dx.doi.org/10.1177/0040517515621134.

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In this paper, a computer-based carving experiment was conducted to make frequency selective fabrics (FSFs) with cross-shaped units. Different samples with varying frequency selective fabric types, structure parameters, conductive layers, base fabrics and unit shapes were prepared and the transmission characteristics were tested using the Shielding Room Method. The reflection characteristics under different electromagnetic (EM) wave incidence angles were also tested to study the angle stability. Experimental results showed that in the given frequency range of 4–14 GHz, two types of frequency selective fabrics had good complementary transmission characteristics, with ideal bandwidths and resonance peaks, and the aperture frequency selective fabrics showed certain stability to small electromagnetic wave incidence angles. Structure parameters played a very important role in determining frequency response characteristics and base fabrics with different effective dielectric constant could also exert a great influence. However, the change of electrical conductivity within a certain extent would not affect the transmission characteristics and related work should be continued to explore the effect rule. Through rational control of the unit shape to increase or decrease the conductive material mass, broad-spectrum shielding or passing-through properties could be obtained. In the paper, the experimental results were discussed and analyzed in detail aiming at different parameters, and internal causes were further investigated, which could provide reference values for the relevant design and product development process.

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34

Su, Lining, Xiaohui Qin, Shang Zhang, Yantao Zhang, Yilang Jiang, and Yi Han. "Fast frequency response of inverter-based resources and its impact on system frequency characteristics." Global Energy Interconnection 3, no. 5 (October 2020): 475–85. http://dx.doi.org/10.1016/j.gloei.2020.11.007.

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35

Mark, J. G., and D. A. Tazartes. "Tuning of Coning Algorithms to Gyro Data Frequency Response Characteristics." Journal of Guidance, Control, and Dynamics 24, no. 4 (July 2001): 641–47. http://dx.doi.org/10.2514/2.4770.

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36

Yusivar, F., H. Haratsu, M. Sato, S. Wakao, K. Kondo, K. Matsuoka, and T. Kawamatsu. "The Modeling of Lead-Acid Battery by Frequency-Response Characteristics." IEEJ Transactions on Fundamentals and Materials 122, no. 8 (2002): 715–21. http://dx.doi.org/10.1541/ieejfms.122.715.

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37

Wen, Chang Bao, Tiao Yang, Cheng Fei Xue, and Yong Feng Ju. "Automatic Test System for Frequency Response Characteristics of SAW Device." Applied Mechanics and Materials 644-650 (September 2014): 1201–4. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.1201.

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To solve complex measurement and difficult remote operation in the test for frequency response characteristic of SAW device, an automatic test system for frequency response characteristic of SAW device based on vector network analyzer is proposed. The system consists of the vector network analyzer, the crossover cable, the computer, the fixtures and the SAW device. The user interface of test system is developed with the VB language. By means of calling the VISA-COM library, the SCPI commands can send to the vector network analyzer. Many functions of the automatic test system for frequency response characteristic of SAW device include the settings of measurement parameters, the measurement calibration, the data storage, the data display, the data transmission, the marker analysis and the data output. By the actual measurement of a SAW device with the center frequency at 101.764MHz, the experimental results show that the transmission loss of SAW device is-27.532dB, and the reflection loss is-7.715 dB.

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38

Shin, Sang Ha, Se Jeong Lee, and Hong Hee Yoo. "Statistical characteristics of frequency response localization in nearly periodic systems." Journal of Sound and Vibration 294, no. 4-5 (July 2006): 1039–50. http://dx.doi.org/10.1016/j.jsv.2006.01.002.

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39

Maaswinkel, Hans, and Lei Li. "Spatio-temporal frequency characteristics of the optomotor response in zebrafish." Vision Research 43, no. 1 (January 2003): 21–30. http://dx.doi.org/10.1016/s0042-6989(02)00395-4.

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40

Ortmeyer, T. H., and T. Hiyama. "Frequency response characteristics of the fuzzy polar power system stabilizer." IEEE Transactions on Energy Conversion 10, no. 2 (June 1995): 333–38. http://dx.doi.org/10.1109/60.391900.

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41

Kolb, Brittany, Diane L. Rotella, and Harald M. Stauss. "Frequency response characteristics of cerebral blood flow autoregulation in rats." American Journal of Physiology-Heart and Circulatory Physiology 292, no. 1 (January 2007): H432—H438. http://dx.doi.org/10.1152/ajpheart.00794.2006.

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Transfer function analysis of blood pressure and cerebral blood flow in humans demonstrated that cerebrovascular autoregulation operates most effectively for slow fluctuations in perfusion pressure, not exceeding a frequency of ∼0.15 Hz. No information on the dynamic properties of cerebrovascular autoregulation is available in rats. Therefore, we tested the hypothesis that cerebrovascular autoregulation in rats is also most effective for slow fluctuations in perfusion pressure below 0.15 Hz. Normotensive Wistar-Kyoto rats ( n = 10) were instrumented with catheters in the left common carotid artery and jugular vein and flow probes around the right internal carotid artery. During isoflurane anesthesia, fluctuations in cerebral perfusion pressure were elicited by periodically occluding the abdominal aorta at eight frequencies ranging from 0.008 Hz to 0.5 Hz. The protocol was repeated during inhibition of myogenic vascular function (nifedipine, 0.25 mg/kg body wt iv). Increases in cerebral perfusion pressure elicited initial increases in cerebrovascular conductance and decreases in resistance. At low occlusion frequencies (<0.1 Hz), these initial responses were followed by decreases in conductance and increases in resistance that were abolished by nifedipine. At occlusion frequencies of 0.1 Hz and above, the gains of the transfer functions between pressure and blood flow and between pressure and resistance were equally high in the control and nifedipine trial. At occlusion frequencies below 0.1 Hz, the gains of the transfer functions decreased twice as much under control conditions than during nifedipine application. We conclude that dynamic autoregulation of cerebral blood flow is restricted to very low frequencies (<0.1 Hz) in rats.

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42

Hickey, D. D., and J. Zaharkin. "Low-frequency response characteristics of three Grass model 7 polygraphs." Journal of Applied Physiology 58, no. 3 (March 1, 1985): 1026–30. http://dx.doi.org/10.1152/jappl.1985.58.3.1026.

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A low-frequency response analysis of three Grass model 7 polygraphs was undertaken. Observed error was generally found to fall within the manufacturer's stated range of +5 to -10% of DC signal height over the frequency range of human respiration (0.1–3 Hz), but this was not the case for frequencies greater than 6 Hz under certain circumstances. The magnitude of error was seen to vary directly with frequency and indirectly with pen-deflection amplitude and paper speed. The pen-oscillograph apparatus was the predominant source of low-frequency error, and this is probably due to pen inertia and pen friction on the writing surface. Two schemes to reduce such error are presented.

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Jau-Wen Chen, Dae-Kaen Kim, and M. B. Das. "Transit-time limited high-frequency response characteristics of MSM photodetectors." IEEE Transactions on Electron Devices 43, no. 11 (1996): 1838–43. http://dx.doi.org/10.1109/16.543016.

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Zhao, Yongjie. "Kineto-Elastodynamic Characteristics of the Six-Degree-of-Freedom Parallel Structure Seismic Simulator." Journal of Robotics 2011 (2011): 1–17. http://dx.doi.org/10.1155/2011/489695.

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Based on the kineto-elastodynamic assumptions, the dynamic model of the six-degree-of-freedom parallel structure seismic simulator is developed by virtue of the finite element method and the substructure synthesis technique. The kineto-elastodynamic characteristics represented by the natural frequency, the sensitivity analysis, the energy ratios, and the displacement response of the moving platform are investigated. It is shown that the second-order natural frequency is much higher than the first-order natural frequency, and the first-order natural frequency is sensitive to the radius of the strut and the radius of the lead screw. In order to improve the dynamic characteristic of the manipulator, the mass of the moving platform should be reduced or the stiffness of the strut should be increased especially for the sixth strut. For the investigated trajectory, the displacement response of the moving platform along thexdirection is smaller than these displacement responses along theydirection and along thezdirection. The angular displacement response of the moving platform rotating aboutz-axis is slightly larger than those angular displacement responses rotating about thex-axis and about they-axis.

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Zhang, Ai Guo, Tie Jun Yang, Jing Tao Du, Peng Lv, and Xin Guang Li. "Finite Element Analysis of Piezoelectric Materials." Advanced Materials Research 860-863 (December 2013): 872–75. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.872.

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The ANSYS finite element techniques were used for modeling and analysis of piezoelectric materials. The single piezoelectric sheet model was presented. The basic characteristic of the piezoelectric materials were analyzed and the affecting factors of characteristics were derived. The high frequency simulation results showed that the displacement responses of piezoelectric materials were very large delay in boost and buck under the high frequency voltage signal, and that was adverse to the vibration control. The low frequency voltage simulation results showed that the displacement response frequency and voltage signal frequency were exactly the same. The model thickness greatly affected its stiffness and indirectly affected its output characteristics.

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Zahraddeen, ABBATI, FULONG Zhao, SICHAO Tan, JIARUI Chen, KUN Cheng, CHUAN He, IBRAHIM Shehu Adam, and K. Abd El Gawad. "TRANSIENT RESPONSE CHARACTERISTICS IN MULTI-LOOP NATURAL CIRCULATION SYSTEM USING FREQUENCY RESPONSE TESTING METHOD." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27 (2019): 1221. http://dx.doi.org/10.1299/jsmeicone.2019.27.1221.

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Zheng, Gao. "Low-Order Frequency Response Model in the Application of Frequency Control." Advanced Materials Research 518-523 (May 2012): 3820–25. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.3820.

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This paper introduces a low-order system frequency response model (SFR). SFR model is simplified from other models, which can be used to estimate the frequency response of a large power system, or sudden load disturbance of the island.SFR model is based on the neglecting nonlinear power system of u the units equation, which is controlled by the steam turbine generator . This means that the generator inertia and reheat time constant make system average frequency response. In addition, because of the two time constant , the resulting frequency response can be calculated in the closed loop form, which provides a simple and accurate method to estimate the essential characteristics of the system frequency response.

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Pan, Hong Xia, Ming Zhi Pan, Run Peng Zhao, and Hai Feng Ren. "An Automaton Fault Diagnosis Based on Shock Response Analysis." Applied Mechanics and Materials 226-228 (November 2012): 745–48. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.745.

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Shock and vibration response is a particularly important signal to characterize the system state. This paper analyzes the reason of fault generated high speed machine, vibration response mechanism and its frequency characteristic. According to the measured vibration signals, done time and frequency domain features analysis, wavelet packet analysis and frequency domain energy analysis, put forward a kind of fault comprehensive diagnosis method with accurate and rapid identification characteristics, can adapt to the complex vibration response signal with interference and low signal to noise ratio.

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Li, Yajie, Zhiqiang Wu, Qixun Lan, Yujie Cai, Huafeng Xu, and Yongtao Sun. "The modulation of response caused by the fractional derivative in the Duffing system under super-harmonic resonance." Thermal Science 25, no. 3 Part B (2021): 2357–67. http://dx.doi.org/10.2298/tsci191201126l.

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The dynamic characteristics of the 3:1 super-harmonic resonance response of the Duffing oscillator with the fractional derivative are studied. Firstly, the approximate solution of the amplitude-frequency response of the system is obtained by using the periodic characteristic of the response. Secondly, a set of critical parameters for the qualitative change of amplitude-frequency response of the system is derived according to the singularity theory and the two types of the responses are obtained. Finally, the components of the 1X and 3X frequencies of the system?s time history are extracted by the spectrum analysis, and then the correctness of the theoretical analysis is verified by comparing them with the approximate solution. It is found that the amplitude-frequency responses of the system can be changed essentially by changing the order and coefficient of the fractional derivative. The method used in this paper can be used to design a fractional order controller for adjusting the amplitude-frequency response of the fractional dynamical system.

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Zhang, Xing Wu, Xue Feng Chen, Shang Qin You, Xiao He, Yi Jie Wang, and Zheng Jia He. "Study on Active Control of Structural Frequency Response." Advanced Materials Research 199-200 (February 2011): 1036–40. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1036.

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As the requirements for industrial operation and military work, the frequency characteristics should be changed artificially sometimes. Active control is a good choice, but the current active control mainly focuses on time domain for vibration control. In this paper, the structural active control on frequency domain is studied through theory and experiment. Firstly, multivariable wavelet finite element method with two kinds of variables (TWFEM) which is suitable for modeling of great and complex structures with high efficiency and precision is used to construct the mathematical model for the controlled structure and do static and dynamic analysis. Then the control algorithm based on neural network including two parts, identification implement and controller is constructed. The present study takes frequency response as control objective, and can not only do vibration control but also change the vibration frequency characteristics, providing a new perspective for active control.

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