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Journal articles on the topic 'Frequency response test'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Maletic, Mladen, Hrvoje Domitrovic, and Ivan Djurek. "Frequency response measurement with composed audio test signal." Journal of the Acoustical Society of America 105, no. 2 (February 1999): 1367. http://dx.doi.org/10.1121/1.426472.

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2

Saunders, R. M. "Synchronous-machine standstill frequency-response test data analysis." IEEE Transactions on Energy Conversion 6, no. 3 (1991): 564–71. http://dx.doi.org/10.1109/60.84336.

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3

Yudaningtyas, Erni, Achsanul Khabib, Waru Djuriatno, Zakiyah Amalia, and Ramadhani Kurniawan Subroto. "Low-frequency response test device of electret condenser microphone." TELKOMNIKA (Telecommunication Computing Electronics and Control) 18, no. 3 (June 1, 2020): 1368. http://dx.doi.org/10.12928/telkomnika.v18i3.14831.

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4

Banaszak, Szymon, and Wojciech Szoka. "Cross Test Comparison in Transformer Windings Frequency Response Analysis." Energies 11, no. 6 (May 25, 2018): 1349. http://dx.doi.org/10.3390/en11061349.

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5

Norman, K. D. "Multiple-bump roadholding test: Description and metric interpretation." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 216, no. 4 (April 1, 2002): 251–58. http://dx.doi.org/10.1243/0954407021529084.

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Road vehicle roadholding comprehends directional response to road inputs. This response is primarily a function of the roadway's frequency content and amplitude and the vehicle's inertial, suspension and tyre characteristics. There is also evidence that suspension kinematic and compliance steer properties can have a significant contribution (Rill, G. Steady state cornering on uneven roadways. SAE paper 860575, 1986). The multiple-bump roadholding test measures vehicle response to a periodic bump of varying frequency while cornering. By driving a vehicle at different speeds over a set of periodic bumps placed on circles of different diameters, it is possible to observe the response to different fundamental bump excitation frequencies at a particular lateral acceleration. This paper describes the test procedure, measured vehicle responses and the metrics calculated.

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6

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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7

Hansen, A. C., and T. E. Hausfeld. "Frequency-Response Matching to Optimize Wind-Turbine Test Data Correlation." Journal of Solar Energy Engineering 108, no. 3 (August 1, 1986): 246–51. http://dx.doi.org/10.1115/1.3268100.

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Pre-averaging is often applied to wind turbine test data to improve correlation between wind speed and power output data. In the past, trial and error or intuition have been used in the selection of pre-averaging time and researchers and institutions have differed widely in their pre-averaging practice. In this paper a standardized method is proposed for selection of the optimum pre-averaging time. The method selects an averaging time such that the test data are low-pass-filtered at the same frequency as the response frequency of the test wind turbine/anemometer system. A theoretial method is provided for estimation of the wind system transfer function as a function of the anemometer location, rotor moment of inertia, the stiffness of the connection between the rotor and the electrical grid, hub height, rotor speed and wind speed. The method is based in proven theory, repeatable, easy to use and applicable to a wide range of wind turbines and test conditions. Results of the transfer function predictions are compared with the measured response of two wind systems. Agreement between the predicted and measured response is completely adequate for the purposes of the method. Example results of calculated averaging times are presented for several wind turbines. In addition, a case study is used to demonstrate the dramatic effects of test design and data analysis methods on the results of a power coefficient measurement.

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8

Belqorchi, Abdelghafour, Ulas Karaagac, Jean Mahseredjian, and Innocent Kamwa. "Standstill Frequency Response Test and Validation of a Large Hydrogenerator." IEEE Transactions on Power Systems 34, no. 3 (May 2019): 2261–69. http://dx.doi.org/10.1109/tpwrs.2018.2889510.

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9

Wang, Dongyang, Lijun Zhou, Xuejiao Chen, Junfei Jiang, and Lujia Wang. "Modelling the low‐frequency dielectric response test of insulation oil." IET Electric Power Applications 11, no. 3 (March 2017): 323–30. http://dx.doi.org/10.1049/iet-epa.2016.0673.

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10

Alexander, Joshua M. "The S-SH Confusion Test and the Effects of Frequency Lowering." Journal of Speech, Language, and Hearing Research 62, no. 5 (May 21, 2019): 1486–505. http://dx.doi.org/10.1044/2018_jslhr-h-18-0267.

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PurposeFrequency lowering in hearing aids can cause listeners to perceive [s] as [ʃ]. The S-SH Confusion Test, which consists of 66 minimal word pairs spoken by 6 female talkers, was designed to help clinicians and researchers document these negative side effects. This study's purpose was to use this new test to evaluate the hypothesis that these confusions will increase to the extent that low frequencies are altered.MethodTwenty-one listeners with normal hearing were each tested on 7 conditions. Three were control conditions that were low-pass filtered at 3.3, 5.0, and 9.1 kHz. Four conditions were processed with nonlinear frequency compression (NFC): 2 had a 3.3-kHz maximum audible output frequency (MAOF), with a start frequency (SF) of 1.6 or 2.2 kHz; 2 had a 5.0-kHz MAOF, with an SF of 1.6 or 4.0 kHz. Listeners' responses were analyzed using concepts from signal detection theory. Response times were also collected as a measure of cognitive processing.ResultsOverall, [s] for [ʃ] confusions were minimal. As predicted, [ʃ] for [s] confusions increased for NFC conditions with a lower versus higher MAOF and with a lower versus higher SF. Response times for trials with correct [s] responses were shortest for the 9.1-kHz control and increased for the 5.0- and 3.3-kHz controls. NFC response times were also significantly longer as MAOF and SF decreased. The NFC condition with the highest MAOF and SF had statistically shorter response times than its control condition, indicating that, under some circumstances, NFC may ease cognitive processing.ConclusionsLarge differences in the S-SH Confusion Test across frequency-lowering conditions show that it can be used to document a major negative side effect associated with frequency lowering. Smaller but significant differences in response times for correct [s] trials indicate that NFC can help or hinder cognitive processing, depending on its settings.

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11

Yan, Xiao Yu, Li Hui Wang, and Xiu Li Du. "Shaking Table Test on Seismic Pounding Response of Reinforced Concrete Bridge." Advanced Materials Research 671-674 (March 2013): 1519–23. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1519.

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To investigate the response of the bridge pounding, shaking table test was performed using 1/10 scaled reinforced concrete rigid frame bridge specimen. The influence of traveling effect on pounding and the anti-impact capability using dampers were discussed. The experimental results demonstrate that the acceleration responses of the girder and bridge piers, the frequency and the impact force are increased when the traveling wave excitation is considered. Moreover, relatively displacement of the adjacent bridge frames increased magnitudely. Dynamic responses, the frequency and the impact force are decrease when the dampers are installed.Therefore, installation of the dampers is a sustainable and effective way to improve the anti-impact capability.

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Yan, Xiao Yu, Li Hui Wang, and Xiu Li Du. "Shaking Table Test on Seismic Response of Isolated Bridge." Applied Mechanics and Materials 275-277 (January 2013): 1034–39. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1034.

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In order to investigate isolation effectiveness on seismic performance of the continuous rigid frame bridge, shaking table test with nine sub-tables on 1/10 scaled reinforced concrete rigid frame bridge specimen was performed. The experimental results demonstrate that isolation devices provide flexibility to transform natural period of the scaled model, and additional it can improve the ability of energy dissipation when lead is used. The initial first frequency is 8.17Hz for plate-type rubber bearing and 9.12Hz for leading rubber bearing. The plate rubber bearing and lead-rubber bearing are quite sensitive to seismic wave frequency. The use of various isolation devices affects response of the bridge model. The results show that the more difference in the isolation devices, the more difference in response. Moreover, isolation effect of lead-rubber bearing show obviously more advantage than the one of plate-type rubber bearing, especially in controlling responses of the bridge during major earthquakes.

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Wang, Dong, Xingrui Ma, and Gangtie Zheng. "Extraction of free body frequency response functions from flexibly constrained test." Mechanical Systems and Signal Processing 46, no. 1 (May 2014): 163–78. http://dx.doi.org/10.1016/j.ymssp.2014.01.003.

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14

Qiang, Yan, Yingzhou Wang, Lan Luo, Gang Wang, Yuyang Zhao, and Liejiang Wei. "Method for filtering proportional valve-frequency-response test data containing impulsive noise." Advances in Mechanical Engineering 11, no. 3 (March 2019): 168781401983629. http://dx.doi.org/10.1177/1687814019836298.

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Impulsive noise, generated by inverters and other equipment used in the field, tends to easily enter test channels in scenarios where continuous frequency conversion signals are employed to test the frequency response of electrohydraulic proportional valves. Interference caused by such noise reduces the signal-to-response ratio of response signals, thereby influencing the accuracy of the frequency response of proportional valves. To address this concern, in this article, an integrated filtering method that combines ensemble empirical mode decomposition with median filtering is proposed. The proposed method first preprocesses the response signals of the systems and subsequently obtains frequency-response diagrams using fast Fourier transforms. Simulation results demonstrate that the proposed method reduces the root mean square error associated with the amplitude–frequency characteristic curves of the proportional directional valve considered from 2.1 to 0.3, whereas that associated with phase–frequency characteristic curves is reduced from 78.0 to 1.4 with signal-to-noise ratios in the high-frequency band being of the order of –20 dB. Experimental results also reveal that the proposed method reduces the root mean square error of the amplitude–frequency characteristic curves of the proportional directional valve by 52.5% and that of the phase–frequency characteristic curves by 71.2%.

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15

Hou, Zhi Wei, Min Zhao, Ai Min Dong, Qiong Wu, and Qiu Feng Li. "Compact Method to Calibrate Frequency Response of Ultrasonic Transducer." Advanced Materials Research 171-172 (December 2010): 416–20. http://dx.doi.org/10.4028/www.scientific.net/amr.171-172.416.

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Frequency response character of ultrasonic transducer often influences on the test signal partly, and then test errors arise. To the problem, a compact method is proposed to calibrate the frequency response in this paper. The experiment data was obtained in water- immerging test of the transducers, and a discrete transfer function is established based on system identification algorithms and then used for transducer calibration. The method is validated effective by experiment. Not only can the characteristic of transducers be indicated, but also a referenced method is presented for calibrating frequency response of LTI system.

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16

Liu, Ji, Daning Zhang, Xinlao Wei, and Hamid Reza Karimi. "Transformation Algorithm of Dielectric Response in Time-Frequency Domain." Mathematical Problems in Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/547105.

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A transformation algorithm of dielectric response from time domain to frequency domain is presented. In order to shorten measuring time of low or ultralow frequency dielectric response characteristics, the transformation algorithm is used in this paper to transform the time domain relaxation current to frequency domain current for calculating the low frequency dielectric dissipation factor. In addition, it is shown from comparing the calculation results with actual test data that there is a coincidence for both results over a wide range of low frequencies. Meanwhile, the time domain test data of depolarization currents in dry and moist pressboards are converted into frequency domain results on the basis of the transformation. The frequency domain curves of complex capacitance and dielectric dissipation factor at the low frequency range are obtained. Test results of polarization and depolarization current (PDC) in pressboards are also given at the different voltage and polarization time. It is demonstrated from the experimental results that polarization and depolarization current are affected significantly by moisture contents of the test pressboards, and the transformation algorithm is effective in ultralow frequency of 10−3 Hz. Data analysis and interpretation of the test results conclude that analysis of time-frequency domain dielectric response can be used for assessing insulation system in power transformer.

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17

Machmudi Isa, Isa Yassir Arafat, Mohd Azman Zainul Abidin, and S. Mansor. "Acceleration Response in Determining Vehicles Objective Driveability Assessment." Applied Mechanics and Materials 663 (October 2014): 121–26. http://dx.doi.org/10.4028/www.scientific.net/amm.663.121.

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Vehicle driveability defined as smoothness of a vehicle operation at the will of the driver under all driving conditions. Driveability evaluation is conducted by giving subjective rating based certain test standard procedures. A group of test evaluators performed driveability test and gave individual rating based on subjective feeling. After discussion, a final overall rating is generated with consensus from all evaluators. Human subjective rating can be inconsistent due to physical health condition and individual preferences.Vehicle's acceleration profile can be associated with second order response. Every acceleration profileshas specific damping factorandnatural frequency.A study is conducted to determine the possibility of using second order parameter to setup an objective driveability assessment. Test vehicles with different acceleration conditionsare evaluated to determine driveability subjective rating. Acceleration profile for each vehicles is analyzed to determine its damping factorand natural frequency. A relation of damping factorand natural frequency with subjective driveability rating is established. The established relation of driveability is essential in providing guideline for future ECU calibration and tuning.

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18

Gianesini, B. M., V. H. F. Brito, R. N. C. Lima, and I. N. Santos. "Frequency Response Test of MV Inductive Voltage Transformers for Power Quality Applications." Renewable Energy and Power Quality Journal 18 (June 2020): 556–61. http://dx.doi.org/10.24084/repqj18.433.

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19

TAKEUCHI, Tomoaki, and Toshiharu KAGAWA. "Applicability of Frequency Response Test for Stability Evaluation of Gas Pressure Regulator." Transactions of the Society of Instrument and Control Engineers 49, no. 8 (2013): 747–54. http://dx.doi.org/10.9746/sicetr.49.747.

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20

Vahidi, B., and M. R. Bank Tavakoli. "Standstill frequency response test analyzer by using Excel Macros for educational purposes." Computer Applications in Engineering Education 20, no. 3 (February 22, 2010): 474–83. http://dx.doi.org/10.1002/cae.20415.

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21

Mor, A. Rodrigo, and L. C. Castro Heredia. "Practical frequency response characterization of a test circuit for partial discharge measurements." IEEE Transactions on Dielectrics and Electrical Insulation 25, no. 4 (August 2018): 1535–44. http://dx.doi.org/10.1109/tdei.2018.006884.

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22

Zhang, Zhao-Dong, Zhen-Le Chi, Hui-Min Chen, and Guo-Yu Luan. "Test of frequency characteristic for well and its response to seismic waves." Acta Seismologica Sinica 12, no. 3 (May 1999): 365–67. http://dx.doi.org/10.1007/s11589-999-0047-9.

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23

Chen, Xi-ming, Bao-he Yang, Xiao-guo Wu, and Yi-zhuo Wu. "Test method of frequency response based on diamond surface acoustic wave devices." Optoelectronics Letters 7, no. 4 (July 2011): 291–93. http://dx.doi.org/10.1007/s11801-011-0076-1.

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24

Yang, Y. B., Bin Zhang, Yao Qian, and Yuntian Wu. "Contact-Point Response for Modal Identification of Bridges by a Moving Test Vehicle." International Journal of Structural Stability and Dynamics 18, no. 05 (May 2018): 1850073. http://dx.doi.org/10.1142/s0219455418500736.

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The response of the contact point of the vehicle with the bridge, rather than the vehicle itself, is proposed for modal identification of bridges by a moving test vehicle. To begin, approximate closed-form solutions were derived for the vehicle and contact-point responses, and they were verified by finite element solutions. The contact-point acceleration is born to be free of the vehicle frequency, an annoying effect that may overshadow the bridge frequencies in case of rough surface. From the frequency response function (FRF) of the vehicle with respect to the contact point, it was shown that the contact-point response generally outperforms the vehicle response in extracting the bridge frequencies because it could identify more frequencies. In the numerical simulations, the contact-point response was compared with the vehicle response for various scenarios. It is concluded that in each case, say, for varying vehicle speeds or frequencies, for smooth or rough road surfaces, with or without existing traffic, the contact-point response outperforms the vehicle response in extracting either the frequencies or mode shapes of the bridge.

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25

Chen, Zhiyi, Pengfei Huang, and Wei Chen. "Seismic response characteristics of multi-story subway station through shaking table test." Advances in Structural Engineering 24, no. 10 (February 11, 2021): 2185–200. http://dx.doi.org/10.1177/1369433221993296.

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A series of shaking table tests were carried out to investigate the seismic response characteristics of a multi-story subway station. Dynamic responses, including accelerations of the soils and the underground structure, layer drift, dynamic earth pressure, and lateral deformation of soils were recorded and analyzed. Several seismic characteristics of multi-story subway station structures are figured out. It is found that in addition to the racking deformation, the rotation vibration is observed for the multi-story subway station subjected to acceleration waves. From the viewpoint of frequency, the low-frequency component and high-frequency component of the acceleration response of the subway station represent the translation and rotation component of the multi-story subway structure, respectively. In addition, the rotation vibration of the deep-depth structure leads to the local squeezing and detachment from the surrounding soils alternately at both top and bottom ends of the sidewalls. This results in the hump-shaped distribution of dynamic earth pressure. The racking deformation of the multi-story subway station has a linear relationship with the dynamic earth pressure at a certain area along the sidewall, where the top of hump-shaped distribution of dynamic earth pressure is.

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26

Way, Thomas C. "Stereopsis in Cockpit Display — A Part-Task Test." Proceedings of the Human Factors Society Annual Meeting 32, no. 2 (October 1988): 58–61. http://dx.doi.org/10.1177/154193128803200211.

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The benefit of adding retinal disparity to color raster display was tested with two formats. Six pilots flew a tracking task and periodically responded to “failures” in the two represented systems, providing a total of 4320 trials. Response time and error frequency were both reduced when disparity augmented monocular cues to “real world” depth. Response time and error frequency were not affected when disparity was used to make an element of an otherwise flat display more noticeable.

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27

Duan, Qiu Hua, and Meng Lin Lou. "Shaking Table Model Test for Vertical Seismic Response of Bent-Type Aqueduct." Advanced Materials Research 163-167 (December 2010): 4156–64. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4156.

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Based on the shaking table model test of a bent-type aqueduct on the rigidity foundation, the dynamic characteristics and seismic performance of the aqueduct structure subjected to vertical seismic waves are discussed. The test indicates that (1) Water in the aqueduct makes the mass of the structure larger and the frequency of the model structure lower. The water in aqueduct makes fundamental frequency of the model reduce 32% and the modal damping increase 38.5% averagely. (2)The hydrodynamic pressure response at the bottom of the aqueduct is the highest. (3)The dynamic effect of El waves on the aqueduct structure is greater than that of all SEW waves. (4) Different types of earthquake waves have different frequency spectrum characteristics, so that the aqueduct model responses differently to different waves. (5) The water in the aqueduct sometimes plays a role as TLD damping in certain scope. If surpassing this scope, the water sloshing makes the vertical acceleration response of the aqueduct increase. The results of the test not only lead to some significant conclusions for the earthquake-resistant design of large bent-type aqueducts, but also provide a ground for further studies on the effects of soil-pile-aqueduct interaction.

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28

Plessers, P., and R. Snoeys. "Dynamic Identification of Convergent Externally Pressurized Gas-Bearing Gaps." Journal of Tribology 110, no. 2 (April 1, 1988): 263–70. http://dx.doi.org/10.1115/1.3261597.

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The dynamic behavior of externally pressurized gas bearings is described by means of frequency response functions, from which dynamic stiffness and damping coefficients are derived. A numerical method is presented to calculate the frequency response function for plane circular thrust bearings with convergent gap geometry. A test procedure is described for measuring the frequency response function of an air film in order to verify computational, results. The comparison reveals a fairly good agreement between measured and calculated frequency responses. Finally, the effect of bearing parameters on the frequency response function of the air film is investigated.

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29

Zhu, Rui, Qingguo Fei, Dong Jiang, and Xiaochen Hang. "Using Sherman–Morrison theory to remove the coupled effects of multi-transducers in vibration test." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 4 (January 18, 2018): 1364–76. http://dx.doi.org/10.1177/0954410017753805.

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Modal parameter identification is adversely affected by the mass loading of the transducer in experiments, especially when multi-transducers are arranged on the lightweight structure. In order to remove the coupling effects of transducers on each measurement point, a hierarchical multi-transducers eliminations method based on Sherman–Morrison theory is investigated. The method consists of two steps: (1) Decomposition: multiple elimination is decomposed into multi-levels, the relationship of the frequency response functions between each level is illustrated in the tree diagram; (2) Elimination: according to the relationship between each level, the measured frequency response functions are modified level by level. Numerical simulation is conducted by employing a three-degrees-of-freedom spring-mass system and the robustness is verified in the noise case. Experimental investigations are undertaken by employing a lightweight cantilever beam: Laser Doppler vibrometer is adopted to obtain measured frequency response functions without transducer mass loading effect, which are regarded as the target data. The initial frequency response functions are obtained in the case, in which multi-accelerometers are arranged and the effects should be removed. The result shows that the method can effectively decouple the frequency response functions due to transducers. In the elimination process, it is necessary to delete duplicate information (frequency response functions), which can greatly reduce the amount of calculation. And the effects of multi-transducers mass can be removed and the corrected frequency response functions are in quite good agreement with the target values.

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30

Li, Qiang, Shuo Zhang, Yujun Wang, Weiwei Xu, and Zhenbo Wang. "A dynamic response test rig of a full-scale rotor–journal bearing system." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 4 (December 6, 2018): 649–59. http://dx.doi.org/10.1177/1350650118817183.

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A design strategy of a test rig for the dynamic behavior of a rotor supported by two full-scale journal bearings was proposed. A special part, called “intermediate”, was set up to allow the convenient changing of the bearing structure. An electromagnetic exciter was used to obtain the natural frequency, and software running on the Microsoft Visual C++6.0 operating platform was programmed for signal acquisition and analysis. Then, the test rig was constructed. The field dynamic balance and natural frequency testing were carried out. The journal orbits and frequency spectrums were used to measure the dynamic response of different structure full-scale journal bearings. The experimental results showed that an acceptable balance effect was achieved after the field dynamic balance. The natural frequency of the rig agreed with the numerical results. Stability was improved through changing the bearing structure. This revealed that this rig can effectively test the dynamic behavior of a rotor supported by a full-scale journal bearing system, which is critical to the design of journal bearings.

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31

Falcão Arantes Filho, João Otávio, and Donizeti de Andrade. "Management Process of a Frequency Response Flight Test for Rotorcraft Flying Qualities Evaluation." Journal of Aerospace Technology and Management 8, no. 3 (August 10, 2016): 289–306. http://dx.doi.org/10.5028/jatm.v8i3.644.

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32

Bladh, Johan, Mattias Wallin, Linn Saarinen, and Urban Lundin. "Standstill Frequency Response Test on a Synchronous Machine Extended With Damper Bar Measurements." IEEE Transactions on Energy Conversion 31, no. 1 (March 2016): 46–56. http://dx.doi.org/10.1109/tec.2015.2450994.

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33

Saboo, Nikhil, Abhisek Mudgal, and Akriti Singh. "Using Frequency Sweep Test to Predict Creep and Recovery Response of Asphalt Binders." Journal of Materials in Civil Engineering 31, no. 6 (June 2019): 04019081. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0002707.

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34

Mpanda-Mabwe, B., K. Beya, M. Crappe, and M. Delhaye. "Estimation of synchronous machine parameters from multisine stand-still frequency response test data." Mathematics and Computers in Simulation 38, no. 4-6 (August 1995): 359–67. http://dx.doi.org/10.1016/0378-4754(94)00045-l.

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35

Wanzheng, Chang, Wang Nan, Cheng Yan, Sun Shumin, Wang Yanzhuo, Li Qinghua, and Zhang Zhihao. "Simulation Evaluation of Fast Frequency Response Capacity of New Energy Power Stations." E3S Web of Conferences 245 (2021): 01030. http://dx.doi.org/10.1051/e3sconf/202124501030.

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The number of new energy power stations in China is boosting in recent years, a large number of conventional power supplies have been replaced, resulting in severe problems in controlling the frequency of power grids and easily leading to frequency issues of the state power grid. When large frequency disturbance occurs in power grid, renewable energy stations can participate in primary frequency regulation of power grid and provide support for system frequency, and the primary frequency regulation capability of the large power grid in sending end is significantly enhanced. In this study, a simulation evaluation method was proposed for the FFR controller of new energy power stations based on the RT-LAB real-time simulation analysis platform. The FFR controller was connected to in the simulation model of the state power grid via I/O physical interfaces and MODBUS communication, so as to conduct the step disturbance test, anti-disturbance performance verification test and automatic generation control (AGC) coordination test and hardware-in-the-loop simulation test of the controller. Results of the tests proved that the test method proposed in this study is accurate and reliable, and help improve the performance of a new energy power station in the state power grid.

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36

Garrido, Marta I., James M. Kilner, Stefan J. Kiebel, and Karl J. Friston. "Dynamic Causal Modeling of the Response to Frequency Deviants." Journal of Neurophysiology 101, no. 5 (May 2009): 2620–31. http://dx.doi.org/10.1152/jn.90291.2008.

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This article describes the use of dynamic causal modeling to test hypotheses about the genesis of evoked responses. Specifically, we consider the mismatch negativity (MMN), a well-characterized response to deviant sounds and one of the most widely studied evoked responses. There have been several mechanistic accounts of how the MMN might arise. It has been suggested that the MMN results from a comparison between sensory input and a memory trace of previous input, although others have argued that local adaptation, due to stimulus repetition, is sufficient to explain the MMN. Thus the precise mechanisms underlying the generation of the MMN remain unclear. This study tests some biologically plausible spatiotemporal dipole models that rest on changes in extrinsic top-down connections (that enable comparison) and intrinsic changes (that model adaptation). Dynamic causal modeling suggested that responses to deviants are best explained by changes in effective connectivity both within and between cortical sources in a hierarchical network of distributed sources. Our model comparison suggests that both adaptation and memory comparison operate in concert to produce the early (N1 enhancement) and late (MMN) parts of the response to frequency deviants. We consider these mechanisms in the light of predictive coding and hierarchical inference in the brain.

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37

CORDA, C., S. A. ALI, and C. CAFARO. "INTERFEROMETER RESPONSE TO SCALAR GRAVITATIONAL WAVES." International Journal of Modern Physics D 19, no. 13 (November 2010): 2095–109. http://dx.doi.org/10.1142/s0218271810018219.

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It was recently suggested that the magnetic component of gravitational waves (GWs) is relevant in the evaluation of frequency response functions of gravitational interferometers. In this paper we extend the analysis to the magnetic component of the scalar mode of GWs which arises from scalar–tensor gravity theory. In the low frequency approximation, the response function of ground-based interferometers is calculated. The angular dependence of the electric and magnetic contributions on the response function is discussed. Finally, for an arbitrary frequency range, the proper distance between two test masses is calculated and its usefulness in the high frequency limit for space-based interferometers is briefly considered.

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38

Chang, S. Y. "A Family of Explicit Dissipative Algorithms for Pseudodynamic Testing." Journal of Mechanics 22, no. 2 (June 2006): 145–54. http://dx.doi.org/10.1017/s1727719100004445.

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AbstractThe α-function method is a family of second-order explicit methods with controlled numerical dissipation. Thus, it is very promising for the pseudodynamic testing of a system where high frequency responses are of no interest. This is because that favorable numerical dissipation can suppress the spurious growth of high frequency responses, which might arise from numerical and/or experimental errors during a test. Furthermore, the implementation of an explicit method for the pseudodynamic testing is much simpler than for an implicit method. The superiority of using this method in performing a pseudodynamic test was verified both analytically and experimentally. In fact, results of error propagation analysis reveal that the spurious growth of high frequency responses can be suppressed and less error propagation is identified when compared to the Newmark explicit method. Actual tests were conducted pseudodynamically to confirm all the analytical results. It is also illustrated that although the high frequency response is insignificant to the total response it may be significantly amplified and propagated and finally destroys the pseudodynamic test results.

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39

Lee, Chong-Won, Young-Ho Ha, Chee-Young Joh, and Cheol-Soon Kim. "In-Situ Identification of Active Magnetic Bearing System Using Directional Frequency Response Functions." Journal of Dynamic Systems, Measurement, and Control 118, no. 3 (September 1, 1996): 586–92. http://dx.doi.org/10.1115/1.2801184.

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Complex modal testing is employed to obtain the directional frequency responses of a four-axis active magnetic bearing system. In the test, magnetic bearings are used as exciters while the system is in operation. The directional frequency response estimates are then used to effectively identify the parameters of the active magnetic bearing system. Experimental results show that the directional frequency response function, which is properly defined in the complex domain, is a powerful tool for identification of bearing as well as modal parameters of the system.

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40

Smith, Craig C., and Forrest L. Staffanson. "Frequency and Spatial Shaping of Inputs for Multiaxis Shaker Testing." Shock and Vibration 3, no. 6 (1996): 393–401. http://dx.doi.org/10.1155/1996/919032.

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Controlled amplitude and phase relationships between multiaxial shaker inputs (i.e., spatial shaping) provides for more realistic simulation of a service environment than does conventional frequency shaping alone. Spatial shaping is described in terms of a basic mathematical model relating test article response (absolute and relative motions) to excitation by the shaker. Advantages and objectives are viewed through spectral relationships. The objective of simulating dynamic responses as in service is shown to be the duplication of the resultant cross-modal response for all important modes, even if the sources of excitation in service are unknown.

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41

Su, Qian, Xing Li, and Hao Bai. "Dynamic Response of Pile-Board Subgrade Based on Large Scale Model Test." Applied Mechanics and Materials 71-78 (July 2011): 383–87. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.383.

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A series of tests based on large scale model are designed to study dynamic response of pile-broad subgrade, aiming at structure’s response towards different load frequency and structure’s performance under long-term dynamic load. The test results indicate that dynamic stress of reinforcement and soil decrease slightly with load frequency, while accelerations trend to increase. Soil under loading plate has certain supporting effect because stress of reinforcement is smaller in test group with soil remains. Performance of pile-board subgrade under long-term dynamic load is steady and reliable since none of stress and displacement varies obviously when loading times increase to 106. Ultimate bearing capacity of pile-board subgrade is much bigger than actual demand, so the structural type of pile-broad plate remains to be optimized.

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42

Yoon, Yeunggurl, Yongju Son, Jintae Cho, SuHyeong Jang, Young-Geun Kim, and Sungyun Choi. "High-Frequency Modeling of a Three-Winding Power Transformer Using Sweep Frequency Response Analysis." Energies 14, no. 13 (July 3, 2021): 4009. http://dx.doi.org/10.3390/en14134009.

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A power transformer is an essential device for stable and reliable power transfer to customers. Therefore, accurate modeling of transformers is required for simulation-based analysis with the model. The paper proposes an efficient and straightforward parameter estimation of power transformers based on sweep frequency response analysis (SFRA) test data. The method first develops a transformer model consisting of repetitive RLC sections and mutual inductances and then aligns the simulated SFRA curve with the measured one by adjusting parameters. Note that this adjustment is based on individual parameter impacts on the SFRA curve. After aligning the two curves, the final transformer model can be obtained. In this paper, actual single-phase, three-winding transformer model parameters were estimated based on field SFRA data, showing that SFRA curves simulated from the estimated model are consistent with the measured data.

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43

Neri, Paolo. "Excitation device for high frequency vibration analysis: Design and test results." Journal of Vibration and Control 24, no. 19 (September 20, 2017): 4620–29. http://dx.doi.org/10.1177/1077546317731210.

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In the present paper, the design and optimization of a high frequency excitation source is presented. The device was developed for a harmonic response analysis test bench, aimed at dynamic characterization and resonance prediction of mechanical structures. A wide frequency range must be covered, depending on the analyzed structure: the range 1–10 kHz was considered in the present work. The device was designed for a test bench aimed at investigating the vibrational response of centrifugal compressor bladed wheels. A really compact solution was needed since the final test bench provides one exciter for each blade (up to 20 devices on the circumference hoop). Both contact and contactless solutions were considered, but only the contact solution was found to fulfill all the specifications. Finally, different stinger solutions were proposed and compared in the paper. The investigated solutions were: a beam stinger (diameter 1 mm); a wire stinger (diameter 0.2 mm); and a ball stinger (diameter 3 mm) with two different support solutions. Experimental tests performed on a device prototype allowed to verify the specifications fulfillment and to choose the best stinger solution for the application.

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44

Kuk, Francis K., and Nonalee M. C. Pape. "The Reliability of a Modified Simplex Procedure in Hearing Aid Frequency-Response Selection." Journal of Speech, Language, and Hearing Research 35, no. 2 (April 1992): 418–29. http://dx.doi.org/10.1044/jshr.3502.418.

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The reliability of a modified simplex procedure to select the preferred frequency response on a programmable hearing aid was studied. The effect of stimulus materials on the selected frequency response, along with the consistency in which the selected frequency response was chosen in repeated test runs, was examined. Two groups of hearing-impaired elderly adults (from 59 to 88 years of age, with a mean age of 70 years) who had worn hearing aids for at least 1 year, participated in the study. Subjects were seen for six sessions lasting 2 to 3 hours each. During each session, subjects listened through a programmable hearing aid and selected a preferred frequency response for optimal hearing using a modified simplex procedure. Discourse passages and consonant nonsense syllables, presented in quiet and in noise, were used as the test conditions. Subjective judgment of discourse clarity and syllable recognition were used as criteria. Three estimates of preferred frequency response were obtained within a session when subjective judgment was used as a criterion and two estimates were obtained within a session when syllable recognition was used as a criterion. Subjects returned for a retest approximately 1 week after completion of all test conditions. The results of the study revealed that, depending on test conditions, approximately 30% of subjects selected the same frequency response and 80% of subjects showed test-retest deviation of less than one step size (one cell) in the selected frequency response. The consistency was highest for discourse material presented in noise and lowest for discourse material presented in quiet. Subjects preferred more high-frequency response when consonant syllables were used for recognition than when discourse was used for subjective judgment. On the other hand, more subjects preferred more low-frequency response for discourse judgment than for consonant-syllable recognition. These results suggest that the choice of stimulus materials affect the outcome and consistency in which these outcomes are generated with the simplex procedure.

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45

Srikanta Murthy, Avinash, Norhafiz Azis, Salem Al-Ameri, Mohd Mohd Yousof, Jasronita Jasni, and Mohd Talib. "Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer." Energies 11, no. 9 (September 2, 2018): 2307. http://dx.doi.org/10.3390/en11092307.

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This paper presents an investigation on the sensitivity of frequency response of a 500 kVA, 11/0.433 kV distribution transformer with and without the presence of a winding clamping structure. Frequency response analysis (FRA) measurements of multiple test configurations were carried out with and without the presence of a winding clamping structure. Statistical analyses based on Pearson’s correlation coefficient (PCC), Spearman’s correlation coefficient (SCC), Kendall’s correlation coefficient (KCC), cross-correlation coefficient (CCF), root mean square error (RMSE), absolute sum of logarithmic error (ASLE), hypothesis test (F-test) and relative factor (RF) were applied to determine the effect of the winding clamping structure. It was found that the removal of the winding clamping structure has an impact on the frequency response signature at the frequency less than 2 kHz during offline measurement. It was found that ASLE and F-test are suitable methods that can be used to indicate the variation of frequency response caused by clamping structure removal of the distribution transformer under study.

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46

Tischler, Mark B. "Identification of Bearingless Main Rotor Dynamic Characteristics from Frequency-Response Wind-Tunnel Test Data." Journal of the American Helicopter Society 44, no. 1 (January 1, 1999): 63–76. http://dx.doi.org/10.4050/jahs.44.63.

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47

Jin, Y., and A. M. El-Serafi. "A 'three transfer functions' approach for the standstill frequency response test of synchronous machines." IEEE Transactions on Energy Conversion 5, no. 4 (1990): 740–49. http://dx.doi.org/10.1109/60.63148.

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48

Zhang, Zhiqiang, Dacheng Cong, Zhidong Yang, Yunfei Cai, and Junwei Han. "Studies on Frequency Response Characteristics of High-Speed Railway Train End Relationship Test System with Flexible Bases." Energies 14, no. 19 (September 27, 2021): 6147. http://dx.doi.org/10.3390/en14196147.

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A train end relationship test system was installed with a Stewart parallel robot on the reaction bases perpendicular to the ground, to test the fatigue and durability of train end relationship components, such as the transfixion way of a high-speed railway train. The flexibility of the reaction bases affected the test accuracy of the train end relationship components within a test frequency band range. In this paper, a coupling characteristic model was established between the flexible bases and the parallel robot. Then, the analytical relationship was analyzed between the natural frequency of the bases and the natural frequency of the parallel robot. Moreover, a design criterion was proposed for the natural frequency of the reaction bases. It was considered that when the natural frequency of the bases was not less than five times the natural frequency of the parallel robot, the influence of the flexibility of the bases on the test accuracy can be ignored. The validity of the design criterion was verified by the simulation results.

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49

Xue, Qi Chao, Guang Ping Zou, and Tao Xue. "The Influence of Cycling Frequency to Response Loading in Fatigue Tests for Sandwich Beam with Viscoelastic Core." Key Engineering Materials 577-578 (September 2013): 665–68. http://dx.doi.org/10.4028/www.scientific.net/kem.577-578.665.

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In 3-point bending fatigue experiments of sandwich plate with visoelastic core and steel faceplates, it is found that response loading of specimen is very sensitive to cycling frequency. From fatigue test, different loading response of sandwich beam obtained in various cycling frequencies. Based on viscoelastic theory, responses of deformation of sandwich plate in cyclic square load wave are calculated. And an explanation of influences of cycling frequency is elaborated.

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50

Yang, Yang, Yuanhao Zhu, Li Wang, Bao Jia, and Ruoyu Jin. "Structural Damage Identification of Bridges from Passing Test Vehicles." Sensors 18, no. 11 (November 19, 2018): 4035. http://dx.doi.org/10.3390/s18114035.

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This paper presents two approaches for the structural damage identification of a bridge from the dynamic response recorded from a test vehicle during its passage over the bridge. Using the acceleration response recorded by the vibration sensors mounted on a test vehicle during its passage over the bridge, along with the computed displacement response, the bending stiffness of the bridge can be determined using either: (1) the frequency-domain method based on the improved directed stiffness method with the identified frequency and corresponding mode shape, or (2) the time-domain method based on the residual vector of the least squares method with a fourth-order displacement moment. By comparing the bending stiffness values identified from the vehicle-collected data for the bridge under the undamaged and damaged states that are monitored regularly by the test vehicle, the bridge damage location and severity can be identified. Through numerical simulations and field tests, the present approaches are shown to be effective and feasible.

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