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Journal articles on the topic 'Sine sweep'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Hine, M. "Swept Sine Vibration Test Conservatism." Journal of the IEST 38, no. 6 (November 1, 1995): 13–17. http://dx.doi.org/10.17764/jiet.2.38.6.kt3t17530875g171.

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The excessive overtest associated with the swept sine vibration test method was measured quantitatively using the index of conservatism and the associated overtest factor for a dynamic mass model of a typical spacecraft component. The response to a fixed amplitude sine sweep test was compared with the flight transient vibration environment for sweep rates of 2, 4, and 6 octaves/min and 300 Hz/min. A response-limited test was also conducted at 6 octaves/min. The conservatism was measured using several characterizations; namely: number of peaks exceeding, ranked peaks, shock response spectrum, shock intensity, three-dimensional shock response spectrum, and ranked peaks. Overtest factors exceeding an order of magnitude were measured for the test response with the number of peaks exceeding and the three-dimensional shock response spectrum.

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2

Kowalski, D., M. D. Rao, J. Blough, and S. Gruenberg. "Dynamic testing of shock absorbers under non-sinusoidal conditions." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 216, no. 5 (May 1, 2002): 373–84. http://dx.doi.org/10.1243/0954407021529183.

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This paper deals with the dynamic characterization of an automotive shock absorber, the continuation of an earlier work [1]. The objective of this ongoing research is to develop a testing and analysis methodology for obtaining dynamic properties of automotive shock absorbers for use in CAE-NVH low-to-mid-frequency chassis models. Stepped sine sweep excitation is currently used in industry to obtain shock absorber parameters along with their frequency and amplitude dependence. Sine-on-sine testing, which involves excitation using two different sine waves, has been done in this study to understand the effects of the presence of multiple sine waves on the estimated dynamic properties. In an effort to obtain all frequency dependent parameters simultaneously, different types of broadband random excitation have also been studied. Results are compared with stepped sine sweep tests. Additionally, actual road data measured on different road profiles have been used as input excitation to obtain the shock absorber parameters for broad frequency bands under realistic amplitude and frequency conditions. These results are compared with both simulated random excitation and stepped sine sweep test results.

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3

Nemat, A. "A linear sine-wave VCO with 5000:1 sweep." IEEE Transactions on Instrumentation and Measurement 40, no. 1 (1991): 42–43. http://dx.doi.org/10.1109/19.69949.

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4

Chai, Shao Feng, Ping Wang, Zhi Jian Wu, Jun Wang, and Gao Feng Che. "Acceleration Data Acquisition and Analysis Method of Shaking Table Test." Applied Mechanics and Materials 724 (January 2015): 205–12. http://dx.doi.org/10.4028/www.scientific.net/amm.724.205.

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Shaking table test is an important means of simulated earthquake in laboratory, slope shaking table test data provide a scientific basis for analysis of dynamic stability and instability mechanism of slopes. Sine vibration table test data processing is different from general frequency domain analysis method, need real-time data processing in time domain. Taking the sine sweep test conditions, which is one of the conditions in "Earthquake landslide and slope prevention and control technology research on shaking table test", as an example. Describes the layout of sensors in shaking table test and the reasons; Sine sweep test load and aim; and listed the steps and methods of the sine sweep test in data processing; Through the processing and analysis of test data identified the vibration frequency of model and shaking table system is 30Hz, damping ratio is 2.06%; Analysis and calculation of the different sections of the slope and position of the amplification coefficient. A methodological guidance for shaking table test and dynamic response analysis of the slope is provided.

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5

Yan, Hui, Liang Chen, Hong Rui Ao, and Hong Yuan Jiang. "The Experimental Research of Vibration Isolation Performance of MR Isolator at High Temperature." Applied Mechanics and Materials 184-185 (June 2012): 525–28. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.525.

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Transmissibility is the main performance evaluation index of Metal Rubber (MR) isolator, which can be got by sine sweep frequency test. At different temperature, the sine sweep frequency test is done with different structural parameter MR isolator. The influence that relative density and pre-deformation have on transmissibility and natural frequency when temperature changed is analyzed. The changing regularity of MR isolator’s transmissibility at different temperature is explored. Research results provide the basis for designing MR isolator.

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6

Oh, Chang Jun, Hee Nam Choi, and Bong Soo Kang. "Vibration Control of an Electromagnetic Shaker by Sweep Sine Signal." Transactions of the Korean Society of Mechanical Engineers - A 42, no. 7 (July 31, 2018): 687–92. http://dx.doi.org/10.3795/ksme-a.2018.42.7.687.

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7

Otero, Jorge, and Ivan Felis. "Measurement Transducer Impulse Response Using an Exponential Sine Sweep Method." Proceedings 4, no. 1 (November 14, 2018): 53. http://dx.doi.org/10.3390/ecsa-5-05752.

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The impulse response of a piezoelectric transducer can be calculated using the electrical equivalent circuit model with the Manson method for bandwidth transducers. Nevertheless, these approaches are not sufficiently precise because the importance of the homogeneous structure medium where the transducer emits the signal in part determines the bandwidth in which it acts due to the medium interactions with the environment. This paper describes preliminary research results on piezoelectric impulse response measurements in a small space, making use of the procedure presented by Angelo Farina for transducers emitting in reverberant spaces. Combining the basics of the exponential sine sweep (ESS) method, techniques of arrival detection, and signal processing it is possible to obtain the impulse response in a piezoelectric transducer emitting in a homogeneous medium.

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8

Kos, Vanja Pahor, Janko Slavič, and Miha Boltežar. "Fatigue Damage for Sweep-Sine and Random Accelerated Vibration Testing." Advances in Mechanical Engineering 7, no. 2 (November 17, 2014): 340545. http://dx.doi.org/10.1155/2014/340545.

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9

Adrian Niță, Valentin. "On Improving Sine Sweep Impulse Response Measurments through Adaptive Filtering." Saudi Journal of Engineering and Technology 6, no. 1 (January 5, 2021): 9–16. http://dx.doi.org/10.36348/sjet.2021.v06i01.002.

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10

Fuellekrug, U., M. Boeswald, D. Goege, and Y. Govers. "Measurement of FRFs and Modal Identification in Case of Correlated Multi-Point Excitation." Shock and Vibration 15, no. 3-4 (2008): 435–45. http://dx.doi.org/10.1155/2008/356087.

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The modal identification of large and dynamically complex structures often requires a multi-point excitation. Sine sweep excitation runs are applied when it is necessary to concentrate more energy on each line of the frequency spectrum. The conventional estimation of FRFs from multi-point excitation requires uncorrelated excitation signals. In case of multi-point (correlated) sine sweep excitation, several sweep runs with altered excitation force patterns have to be performed to estimate the FRFs. An alternative way, which offers several advantages, is to process each sine sweep run separately. The paper first describes the conventional method for FRF estimation in case of multi-point excitation, followed by two alternative methods applicable in case of correlated excitation signals. Both methods generate a virtual single-point excitation from a single run with multi-point excitation. In the first method, an arbitrary structural point is defined as a virtual driving point. This approach requires a correction of the modal masses obtained from modal analysis. The second method utilizes the equality of complex power to generate virtual FRFs along with a single virtual driving point. The computation of FRFs and the modal identification using virtual single-point excitation are explained. It is shown that the correct set of modal parameters can be identified. The application of the methods is elucidated by an illustrative analytical example. It could be shown that the separate evaluation of symmetric and anti-symmetric multi-point excitation runs yield obviously better and more reliable results compared to the conventional method. In addition, the modal analysis of the separate symmetric and anti-symmetric excitation runs is easier, since the stabilization diagrams are easier to interpret. The described methods were successfully applied during the Ground Vibration Tests on Airbus A380 and delivered excellent results. The methods are highly advantageous and may thus be established as a new standard procedure for testing aerospace structures.

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11

Kamisiński, Tadeusz, Krzysztof Brawata, Adam Pilch, Jarosław Rubacha, and Marcin Zastawnik. "Test Signal Selection for Determining the Sound Scattering Coefficient in a Reverberation Chamber." Archives of Acoustics 37, no. 4 (December 1, 2012): 405–9. http://dx.doi.org/10.2478/v10168-012-0051-2.

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Abstract The paper focuses on the problem of test signal selection in determining the sound scattering coefficient in accordance with ISO 17497-1. Research shows that the use of MLS signal is preferred in this procedure. The sine sweep signal, despite its advantages, presents certain limitations if the sample is moving during measurement. An attempt has been made to develop a method that allows for minimization of error, demonstrating the dependence of the obtained values of the sound scattering coefficient on the rotational speed of the turntable and type of test signal. Conditions for the application of the sine sweep signals in continuous and discrete measurements were defined.

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12

Dossogne, T., L. Masset, B. Peeters, and J. P. Noël. "Nonlinear dynamic model upgrading and updating using sine-sweep vibration data." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2229 (September 2019): 20190166. http://dx.doi.org/10.1098/rspa.2019.0166.

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Dynamic modelling is a core activity in mechanical engineering towards supporting system and control design. It is typically carried out in a computational environment, involving idealizing assumptions of diverse kinds. The most notable assumption commonly adopted in the field is the excitation-to-response linearity of the mechanical vibrations. This common practice contrasts with the day-to-day experience of test engineers, who are ever more confronted with nonlinearities when dynamically testing modern mechanical structures. A nonlinear behaviour may result from various physical mechanisms, the most recurrent being the existence of dynamic boundary conditions in the direct vicinity of structural joints and interfaces. In this paper, a coherent set of techniques is described to locate, characterize and model nonlinearities using sine-sweep vibration data, with the purpose of upgrading a pre-existing linear numerical model into a reliable nonlinear one. A constant thread in this set of techniques is the analysis of sensor measurements in phase space. The presented tools are illustrated using acceleration time histories measured at multiple forcing amplitudes on a full-scale F-16 aircraft. Nonlinear stiffness and damping elements, modelling a loosened attachment at one of the aircraft wing tips, are identified and introduced in a linear finite-element model, leading to accurate response predictions in a strongly nonlinear regime of motion.

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13

Nabuco, Marco, and Paulo Brando. "Reverberation time measurement using integrated impulse response and sweep sine excitation." Journal of the Acoustical Society of America 112, no. 5 (November 2002): 2397. http://dx.doi.org/10.1121/1.4779770.

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14

Delvaux, Bertrand, and David Howard. "Using an exponential sine sweep to measure the vocal tract resonances." Journal of the Acoustical Society of America 134, no. 5 (November 2013): 4206. http://dx.doi.org/10.1121/1.4831442.

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15

Napolitano, Kevin. "METHODS AND APPARATUS FOR VIBRATION TESTING USING MULTIPLE SINE SWEEP EXCITATION." Journal of the Acoustical Society of America 133, no. 4 (2013): 2514. http://dx.doi.org/10.1121/1.4800119.

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16

Palmieri, M., F. Cianetti, G. Zucca, G. Morettini, and C. Braccesi. "Spectral analysis of sine-sweep vibration: A fatigue damage estimation method." Mechanical Systems and Signal Processing 157 (August 2021): 107698. http://dx.doi.org/10.1016/j.ymssp.2021.107698.

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17

Reina, Salvatore, Robert Arcos, Arnau Clot, and Jordi Romeu. "An Efficient Experimental Methodology for the Assessment of the Dynamic Behaviour of Resilient Elements." Materials 13, no. 13 (June 27, 2020): 2889. http://dx.doi.org/10.3390/ma13132889.

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The assessment of the dynamic behaviour of resilient elements can be performed using the indirect method as described in the standard ISO 10846-3. This paper presents a methodology for control the error on the estimation of the frequency response functions (FRF) required for the application of the indirect method when sweep sine excitation is used. Based on a simulation process, this methodology allows for the design of the sweep sine excitation parameters, i.e., the sweep rate and the force amplitude, to control three types of errors associated to the experimentally obtained FRF in the presence of background noise: a general error of the FRF in a selected frequency range, and the errors associated to the amplitude and the frequency of the FRF resonance peak. The signal processing method used can be also tested with this methodology. The methodology has been tested in the characterisation of two different resilient elements: an elastomer and a coil spring. The simulated error estimations has been found to be in good agreement with the errors found in the measured FRF. Furthermore, it is found that for large signal-to-noise ratios, both sweep rate and force amplitude significantly affect the FRF estimation error, while, for small signal-to-noise ratios, only the force amplitude can control the error efficiently. The current methodology is specially interesting for laboratory test rigs highly used for the dynamic characterisation of resilient elements which are required to operate efficiently, since it can be used for minimising test times and providing quality assurance. Moreover, the application of this methodology would be specially relevant when characterisation is done in noisy environments.

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18

Braccesi, Claudio, Filippo Cianetti, Leonardo Goracci, and Massimiliano Palmieri. "Sine-Sweep qualification test for engine components: The choice of simulation technique." Procedia Structural Integrity 24 (2019): 360–69. http://dx.doi.org/10.1016/j.prostr.2020.02.033.

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19

Li, Xiao Lin, and Xia Yan. "Simulation of Sinusoidal Vibration Control Algorithm Based on Hydraulic Vibration Table." Advanced Materials Research 1016 (August 2014): 198–203. http://dx.doi.org/10.4028/www.scientific.net/amr.1016.198.

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In this paper, the model of hydraulic vibration system is established and sinusoidal vibration control algorithm is discussed and studied. A sinusoidal control hydraulic vibration system is designed. By simulation, this system has good frequency response characteristic and sine sweep control function.

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20

Peykov, P., T. Diaz, and M. Aceves. "Determination of recombination lifetime in MOS structures by a sine voltage-sweep technique." Materials Science in Semiconductor Processing 5, no. 6 (December 2002): 515–18. http://dx.doi.org/10.1016/s1369-8001(02)00068-9.

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21

Jerome, Trevor W., Micah R. Shepherd, and Stephen Hambric. "Nonlinear response of a flanged fastened joint due to acoustical sine sweep excitation." Journal of the Acoustical Society of America 145, no. 3 (March 2019): 1794. http://dx.doi.org/10.1121/1.5101562.

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22

Chen, Tao, and Da Wei Zhang. "Development of Vibration Excitation and Control System for High Frequency Application." Applied Mechanics and Materials 246-247 (December 2012): 1283–88. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.1283.

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A complete system of vibration excitation with force feedback control for piezoelectric inertial exciter is presented. The vibration exciter is constructed and its dynamic model is established composed by piezoelectric stack, inertial mass and pretension institutions based on principle of inertia and reaction. The control system takes software program as the core part. The workflow of the digital step sine sweep control software for exciting force limit is recounted. Variety techniques are utilized to ensure real time and stability in the control process, including synchronization output and acquisition, extracting single tone information from waveform, model reference adaptive scaling control for amplitude of the output waveform. Some tests on a micro driving platform with high stiffness are carried out to verify the actual performance of the system. The results show that the piezoelectric inertial exciter and control system designed are very suitable for step sine sweep vibration excitation and exciting force control in high frequency range.

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23

Nali, Pietro, and Alain Bettacchioli. "Beating phenomena in spacecraft sine testing and an attempt to include the sine sweep rate effect in the test-prediction." Advances in aircraft and spacecraft science 3, no. 2 (April 25, 2016): 197–209. http://dx.doi.org/10.12989/aas.2016.3.2.197.

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24

Crotti, Gabriella, Giovanni D’Avanzo, Domenico Giordano, Palma Sara Letizia, and Mario Luiso. "Extended SINDICOMP: Characterizing MV Voltage Transformers with Sine Waves." Energies 14, no. 6 (March 19, 2021): 1715. http://dx.doi.org/10.3390/en14061715.

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The paper presents a method for the frequency characterization of voltage transformers (VTs) for medium voltage (MV) grids which involves only sine waves. It is called extended SINDICOMP, since it is an extended version of the previously developed technique SINDICOMP. It requires, in the first step, an evaluation and a compensation of the non-linearity introduced by the VT when it is supplied with a 50 Hz sinusoidal input at rated value. Then, the VT is characterized with a low voltage sinusoidal frequency sweep from the second harmonic frequency up to the first resonance frequency. Some rules to build the approximated frequency response, starting from these two sets of data, are given in the paper. The proposed approach is applied to three commercial MV VTs. Significant improvement of the VT performance is obtained, compared to the use of a frequency response obtained from the low voltage characterization.

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25

Haile, William. "Validation of a Simple Formula for Force Limits in Vibration Testing." Journal of the IEST 41, no. 4 (July 19, 1998): 24–29. http://dx.doi.org/10.17764/jiet.41.4.f8141101x76r62qm.

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A new formula for the limiting force to be used in dual control vibration testing is explored by use of a simple but general-purpose example. The results of the force formula are compared with the exact solution and found to be in excellent agreement. Extrapolation from random vibration to sine sweep testing is included.

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26

Rebillat, Marc, and Maarten Schoukens. "Comparison of least squares and exponential sine sweep methods for Parallel Hammerstein Models estimation." Mechanical Systems and Signal Processing 104 (May 2018): 851–65. http://dx.doi.org/10.1016/j.ymssp.2017.11.015.

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27

Liao, Ningsheng, Hang Zhang, Dongliang Yu, Shulu Feng, and Shimin Zhang. "Free-span identification of buried gas pipe subjected to sine sweep load in pipe." Measurement 163 (October 2020): 108020. http://dx.doi.org/10.1016/j.measurement.2020.108020.

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28

Cheng, He Zhang, Shao Yi Hu, and Guang Ping Zou. "Research on Vibration Characteristic of Metal Rubber by Wire Mesh." Applied Mechanics and Materials 633-634 (September 2014): 242–45. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.242.

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The paper mainly concerns about how relative density and pre-compression quantity of metal rubber shock absorber (MRSA) affect acceleration transmissibility, natural frequency and other parameters of MRSA. In order to study the influence law, sine wave sweep experiment was conducted on different MRSA, and the final data was processed. The influence law could provide reference for practical application of MRSA.

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29

Bonato, Marco, and Philippe Goge. "Assessing the Vibration Fatigue Life of Engine Mounted Components." Journal of the IEST 61, no. 1 (December 1, 2018): 20–30. http://dx.doi.org/10.17764/1098-4321.61.1.20.

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Abstract As part of the design validation of components mounted on rotating machinery such as a car engine, it is essential to understand the environmental stress in which they operate. In the case of vibration loadings, the reliability must be verified according to accelerated tests that realistically reproduce the in-service stress. Indeed, a representative validation profile permits not only the assessment of the component durability, but also provides a reliable reference for design optimization (downsizing), reducing development cycle costs, and time scale. This paper proposes an innovative methodology to generate tailored vibration signals more representative of the real environment. First, the severity of the test is tailored to the specific engine usage profile, i.e., the time spent at each revolution per minute (RPM) for a given percentile of customer usage. Traditional signals of Power Spectrum Density (PSD) and sine sweep are developed according a fatigue damage approach (test tailoring). Then, a more representative vibration specification is obtained as a multiple-sine-on-random signal. The signal is expressed as a series of multiple sine sweeps (representing the engine harmonics) and a PSD (representing the random leftover signal). A case study applied to an engine mounted heat exchanger (a water-cooled intercooler) is presented. The generated specification is compared to the validation signals developed according to existing procedures. The results show that 1) the tailored approach decreases the risk of unnecessary over-testing and 2) the multi-swept-sine-on-random signal guarantees the best representativeness of the real environment.

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30

Bellini, Maria Costanza, Luca Collini, Angelo Farina, Daniel Pinardi, and Kseniia Riabova. "Measurement of Loudspeakers with a Laser Doppler Vibrometer and the Exponential Sine Sweep Excitation Technique." Journal of the Audio Engineering Society 65, no. 7/8 (August 15, 2017): 600–612. http://dx.doi.org/10.17743/jaes.2017.0017.

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31

Peykov, P., T. Diaz, and T. Carillo. "Determination of Generation Lifetime and Surface Generation Velocity by Sine-Voltage Sweep C-V Method." Solid State Phenomena 6-7 (January 1989): 453–56. http://dx.doi.org/10.4028/www.scientific.net/ssp.6-7.453.

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32

Ţopa, Marina Dana, Norbert Toma, Botond Sandor Kirei, Ioana Sărăcuţ, and Angelo Farina. "Experimental Acoustic Evaluation of an Auditorium." Advances in Acoustics and Vibration 2012 (September 23, 2012): 1–8. http://dx.doi.org/10.1155/2012/868247.

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The paper presents a case history: the acoustical analysis of a rectangular auditorium. The following acoustical parameters were evaluated: early decay time, reverberation time, clarity, definition, and center time. The excitation signal was linear sweep sine and additional analysis was carried out: peak-to-noise ratio, reverberation time for empty and occupied room, standard deviation of acoustical parameters, diffusion, and just noticeable differences analysis. Conclusions about room’s destination and modeling were drawn in the end.

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33

Schmitz, Thomas, and Jean-Jacques Embrechts. "Hammerstein Kernels Identification by Means of a Sine Sweep Technique Applied to Nonlinear Audio Devices Emulation." Journal of the Audio Engineering Society 65, no. 9 (September 18, 2017): 696–710. http://dx.doi.org/10.17743/jaes.2017.0025.

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34

Ibragimov, R. N., S. Bakhtiyarov, and P. Zweigart. "Correlation Between Three-dimensional Sine Sweep Dynamics Vibration Testing and Resonantly Interacting Internal Gravity Wave Field." Mathematical Modelling of Natural Phenomena 12, no. 1 (2017): 62–93. http://dx.doi.org/10.1051/mmnp/201712105.

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35

Dembowski, Paweł, and Robert Jankowski. "Shaking Table Experimental Study on Damage Mechanism of the Disconnecting Switch under Seismic Excitation." Key Engineering Materials 488-489 (September 2011): 351–54. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.351.

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The efficiency of the energetic network is a very import safety issue in the region experienced by the earthquake. High voltage disconnecting switches are important elements of the energetic infrastructure used to separate electric circuits (i.e. during repairs), which should not be damaged remaining fully operational. The aim of the paper is to show the results of the shaking table experimental investigation focused on damage mechanism of a high voltage disconnecting switch under seismic excitation. The real example of the two-column pantograph-type disconnecting switch was considered in the study. First, the tests were carried out by exciting the unit with the sweep-sine function. Based on the results, the structural dynamic properties of undamaged structure (natural frequencies, damping ratios) could be determined. Then, the so called rumbling seismic tests were conducted in order to determine the seismic strength of disconnecting switch according to the standards PN-EN 60068-3-3. After each experiment, the sweep-sine test was carried out so as to check the decrease in the natural frequencies of the unit. The results of the study show that the lower parts of the columns, which serve as isolators, are the most critical locations of the disconnecting switch considered. The unit was damaged due to failure of one of the rotational mechanisms installed at the bottom of columns.

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36

Wang, Xiu Gang, Zheng Ji, Jian Su, Xiao Ning Cao, and Meng Meng Li. "Research of Test Method for the Natural Vibration Frequency of Bogie." Advanced Materials Research 503-504 (April 2012): 1050–54. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.1050.

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In order to determine the，a test bench for the natural vibration characteristics of the bogie suspension was put forward. Firstly the natural vibration characteristics structure composition and the testing principle was introduced, the sine sweep incentive was simulated, and the inverse kinematics solution model and the real-time solution model were developed. The Comparison of the simulation result and the geometric theory results was carried out, proving the accuracy of the inverse kinematics solution model and the simulation model.

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37

Zhang, Dong Bing, Xiang Lin Jiang, and Yan Hui Liu. "Experimental Study of Dynamic Properties for Serially Isolated System." Advanced Materials Research 250-253 (May 2011): 2814–17. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2814.

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This paper presents a new-style isolation device for serially isolated system by the dynamic analysis to serially isolated system. This device has small horizontal stiffness and the difference of this device with rubber-lead bearing is that this device can resist biggish vertical tensile force. Then the experiment for small-scale model of this device based on sweep sine shaking table is processed. The results show serially isolated system with this device can prolong natural period of serial system and effectively decrease the response of superstructure and have good isolated performance and stability.

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38

Abtahi, Farhad, Fernando Seoane, and Kaj Lindecrantz. "Electrical bioimpedance spectroscopy in time-variant systems: Is undersampling always a problem?" Journal of Electrical Bioimpedance 5, no. 1 (August 8, 2019): 28–33. http://dx.doi.org/10.5617/jeb.801.

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Abstract During the last decades, Electrical Bioimpedance Spectroscopy (EBIS) has been applied mainly by using the frequency-sweep technique, across a range of many different applications. Traditionally, the tissue under study is considered to be time-invariant and dynamic changes of tissue activity are ignored by treating the changes as a noise source. A new trend in EBIS is simultaneous electrical stimulation with several frequencies, through the application of a multi-sine, rectangular or other waveform. This method can provide measurements fast enough to sample dynamic changes of different tissues, such as myocard. This high sampling rate comes at a price of reduction in SNR and the increase in complexity of devices. Although the frequency-sweep technique is often inadequate for monitoring the dynamic changes in a variant system, it can be used successfully in applications focused on the time-invariant or slowly-variant part of a system. However, in order to successfully use frequency-sweep EBIS for monitoring time-variant systems, it is paramount to consider the effects of aliasing and especially the folding of higher frequencies, on the desired frequency e.g. DC level. This paper discusses sub-Nyquist sampling of thoracic EBIS measurements and its application in the case of monitoring pulmonary oedema. It is concluded that by considering aliasing, and with proper implementation of smoothing filters, as well as by using random sampling, frequency-sweep EBIS can be used for assessing time-invariant or slowly-variant properties of time-variant biological systems, even in the presence of aliasing. In general, undersampling is not always a problem, but does always require proper consideration.

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39

Pyra, Józef, Maciej Kłaczyński, and Rafał Burdzik. "Analysis on the Possibility of Eliminating Interference from Paraseismic Vibration Signals Induced by the Detonation of Explosive Materials." Sensors 20, no. 21 (November 9, 2020): 6401. http://dx.doi.org/10.3390/s20216401.

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This article presents the results of studies on the impact of acoustic waves on geophones and microphones used to measure airblasts carried out in a reverberation chamber. During the tests, a number of test signals were generated, of which two are presented in this article: frequency-modulated sine (sine sweep) waves in the 30–300 Hz range, and the result of detonating 3 g of pyrotechnic material inside the chamber. Then, based on the short-time Fourier transform, the spectral subtraction method was used to remove unwanted disruption interfering with the recorded signal. Using MATLAB software, a program was written that was calibrated and adapted to the specifics of the measuring equipment based on the collected test results. As a result, it was possible to clean the signals of interference and obtain a vibration signal propagated by the substrate. The results are based on signals registered in the laboratory and made in field conditions during the detonation of explosive materials.

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Liu, Yan Hui, Ping Tan, Fu Lin Zhou, Yong Feng Du, and Wei Ming Yan. "Vibration Control of Serially Connected Isolation System Using Piezoelectric Actuator." Advanced Materials Research 250-253 (May 2011): 2112–15. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2112.

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This paper presents a bidirectional piezoelectric actuator, which can be used to vibration control of serially connected isolation System. Firstly, the performance test of this control device was processed. Then vibration control experiment of serially connected isolation system with this control device based on sweep sine shaking table was carried out. The experimental results show that this control device has stable mechanical properties, produces semi-active control force fast and has the outstanding control efficiency for serially connected isolation system. In addition, this control still has the satisfactory control efficiency when the piezoelectric actuator of this control is failed, which indicates the fail-safe function of this control.

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Qian, Su Xiang, Zhu Ping Li, Xiao Jun Gu, and Qi Du. "Research and Development the Method of Transformer Winding Deformation Fault Diagnosis Based on FRA." Advanced Materials Research 301-303 (July 2011): 742–47. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.742.

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For the purpose of enhance the accuracy and sensitivity of FRA of transformer winding deformation fault diagnose, this paper made several improvements on the traditional FRA. Regarding the signal source's insufficiency, we changed the impulse replaces the sine frequency sweep signal. The test results showed: after the improvement, the test cycle reduces and the signal frequency response range is broader. We also used the FFT and EMD method to improvement the analysis of frequency response curves, this increased the analysis accuracy and diagnose sensitivity, find the fault characteristic. This study can be used on the development of transformer winding fault diagnosis, detection and test methods.

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San Andrés, Luis, Sergio E. Diaz, and Luis E. Rodriguez. "Sine Sweep Loadvs. Impact Excitations and Their Influence on the Damping Coefficients of a Bubbly Oil Squeeze Film Damper." Tribology Transactions 44, no. 4 (January 2001): 692–98. http://dx.doi.org/10.1080/10402000108982512.

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Chen, Taicong, and Zhou Zhou. "An Improved Vision Method for Robust Monitoring of Multi-Point Dynamic Displacements with Smartphones in an Interference Environment." Sensors 20, no. 20 (October 20, 2020): 5929. http://dx.doi.org/10.3390/s20205929.

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Current research on dynamic displacement measurement based on computer vision mostly requires professional high-speed cameras and an ideal shooting environment to ensure the performance and accuracy of the analysis. However, the high cost of the camera and strict requirements of sharp image contrast and stable environment during the shooting process limit the broad application of the technology. This paper proposes an improved vision method to implement multi-point dynamic displacement measurements with smartphones in an interference environment. A motion-enhanced spatio-temporal context (MSTC) algorithm is developed and applied together with the optical flow (OF) algorithm to realize a simultaneous tracking and dynamic displacement extraction of multiple points on a vibrating structure in the interference environment. Finally, a sine-sweep vibration experiment on a cantilever sphere model is presented to validate the feasibility of the proposed method in a wide-band frequency range. In the test, a smartphone was used to shoot the vibration process of the sine-sweep-excited sphere, and illumination change, fog interference, and camera jitter were artificially simulated to represent the interference environment. The results of the proposed method are compared to conventional displacement sensor data and current vision method results. It is demonstrated that, in an interference environment, (1) the OF method is prone to mismatch the feature points and leads to data deviated or lost; (2) the conventional STC method is sensitive to target selection and can effectively track those targets having a large proportion of pixels in the context with motion tendency similar to the target center; (3) the proposed MSTC method, however, can ease the sensitivity to target selection through in-depth processing of the information in the context and finally enhance the robustness of the target tracking. In addition, the MSTC method takes less than one second to track each target between adjacent frame images, implying a potential for online measurement.

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Reilly, Thomas, Kevin McIntosh, Chris Sensor, and Raman Sridharan. "Structural Testing of High Value Test Articles: Integrated Risk Mitigation in Vibration Test Systems." Journal of the IEST 62, no. 1 (November 1, 2019): 26–32. http://dx.doi.org/10.17764/1557-2196-62.1.26.

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Abstract Structural testing and model verification are necessities in the development of high-value spacecrafts and components. Testing of such items using electrodynamic shaker systems is meticulously planned to avoid any accidental damage. Similarly, the controller and amplifiers used to drive the shakers must be capable of mitigating risk by safely responding to unplanned vibration excursions during a test, as well as to issues with the test system itself, or with facility resources such as electrical power. For example, what happens if the amplifier power source fails, or the network connecting the controller to the command computer goes down? External factors such as these are unpredictable, but careful consideration during vibration test system design makes it is possible for the system to handle such events reliably and minimize risk of damage. Recent advancements in technology have resulted in the design of a complete test system that stresses risk mitigation. The status of building power, safety interlocks, and other critical subsystems are continuously monitored by the controller. A failure on any of the critical subsystems will immediately trigger the controller to ramp down the sine sweep over a prescribed duration. The rate at which the controller reacts to an abort signal is critical. For example, if amplifier power loss is experienced during a sine sweep, the controller must be able to ramp down the drive and stop the test smoothly. Similarly, the amplifier needs stored backup power for the ramp down. These features protect the test article from any transients by preventing the shaker from abruptly stopping. This paper will investigate such safety concerns in structural testing of high value test articles, and the test system considerations associated with these concerns.

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Belaïd, Marouane, Stéphane Fontaine, Ali El Hafidi, Papa Benoît Piezel, and Papa Birame Gning. "Prediction of Dissipative Properties of Flax Fibers Reinforced Laminates by Vibration Analysis." Applied Mechanics and Materials 822 (January 2016): 411–17. http://dx.doi.org/10.4028/www.scientific.net/amm.822.411.

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This study proposes an experimental-numeric method to identify the viscoelastic properties of flax fibres reinforced composite laminate (flax/epoxide). The used method consists in identifying the evolutions of both loss factor and stiffness when vibrational frequency changes. In this way, several free-free symmetrically guided beams are excited on a dynamic range of 10 to 4000 Hz with sweep sine excitation focused around the 4-first’s modes. Fractional derivative Zener model is used to identify the on-axis ply complex moduli and describe the laminate dissipative linear behavior with the classical laminate theory. Results obtained on a quasi-isotropic laminate show that this model adequately predicts the vibrational behavior of the tested laminates.

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Schott, G. A., G. M. Hulbert, and C. F. Heberling. "Results From Dynamic Tests and Analyses of a Medium Diameter LMFBR Piping System." Journal of Pressure Vessel Technology 108, no. 3 (August 1, 1986): 330–33. http://dx.doi.org/10.1115/1.3264793.

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This paper presents results and observations from dynamic tests and analyses performed on an 8-in. (0.20-m) diameter, thin-walled piping system. The piping system is a scaled representation of a Liquid Metal Fast Breeder Reactor (LMFBR) large diameter piping loop. Prototypic piping restraints were employed, including mechanical snubbers, rigid struts, pipe hangers and nonintegral pipe clamps. Snap-back, sine-sweep and seismic tests were performed for various restraint configurations and piping conditions. The test results are compared to analytical predictions for verification of the methods and models used in the seismic design of LMFBR piping systems. Test program conclusions and general recommendations for piping seismic analyses are presented along with a discussion of test and analysis results.

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Fan, Ru Sen, Yong Wang, Jun Jie Yang, and Zhi Wang. "Design of Dual High Precision High Resolution Frequency Synthesizer Based on AD9854." Applied Mechanics and Materials 568-570 (June 2014): 340–43. http://dx.doi.org/10.4028/www.scientific.net/amm.568-570.340.

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To obtain dual high-precision and high-resolution numerical control signal source, and accurately adjust the signal frequency, the paper proposed a method based on AD9854 direct digital frequency synthesis technology, design and implementation the dual high-precision and high-resolution frequency synthesizer. FPGA controlled AD9854 registers to achieve frequency modulation, and after amplification processing output by THS3001, increasing the output signal drive capability. Comprehensive consideration the anti-jamming measures, the system is stable and reliable, the output signal frequency range from 500Hz to 30MHz relative error is less than 10ppm, and can numerical adjust the sine and square wave frequency and has a sweep output mode. Compared with previous equipment, it reduces the system power consumption and volume.

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Jeon, Jun Cheol, Jung Woo Sohn, and Seung Bok Choi. "Comparison of Dynamic Signal of MFC and PVDF Sensor: Experimental Investigation." Advanced Materials Research 317-319 (August 2011): 1098–101. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.1098.

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In this paper, identification of dynamic sensing characteristics of MFC(macro fiber composite) and PVDF(polyvinylidene fluoride) are carried out via experimental investigation. A clamped aluminum beam structure is prepared and experimental setup for beam vibration test is established with shaker system. MFC and PVDF are attached on the top and bottom surface of the beam structure, respectively and connected to data acquisition system. In order to verify the operating bandwidth, frequency responses of the smart beam structure are obtained from 0Hz to 5kHz under sine sweep excitation. For the identification of dynamic sensing characteristics, experiments for linearity and durability are conducted. It is observed that both MFC and PVDF have excellent sensing performance in measuring dynamic response and monitoring structural vibration.

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Berak, Elzbieta. "Modal Testing and Finite Element Analysis of a Battery Rack for Seismic Applications." Journal of the IEST 48, no. 1 (September 1, 2005): 94–102. http://dx.doi.org/10.17764/jiet.48.1.784m8hv205744x26.

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One of the most challenging aspects of reliability testing in the telecommunication industry is earthquake resistance testing. Cabinet systems, battery racks, equipment racks, and distribution frames are considered compliant with Network Equipment-Building System (NEBSTM) criteria for surviving earthquake conditions if test results indicate (1) the maximum deflection of the top of the structure does not exceed 7.6 cm (3 in.), (2) there are no permanent deformations or structural damage, and (3) the equipment or batteries remain functional (as defined in NEBS Requirements: Physical Protection, Specification GR-73 Issue 2). Based on seismic test results of a large population of telecom enclosures, it is accepted that a system always passes the seismic test if its fundamental natural frequency is at least 6 Hz. It is costly to produce and configure enclosures and conduct seismic qualification testing. To minimize the risk of telecom system failure, a modal finite element analysis (FEA) of the system should first be performed. Numerical results of the FEA should then be verified with experimental resonance search data generated by modal testing or sine sweep testing, combined with static pull testing where applicable. The resonance search results will determine the need for seismic testing (seismic analysis) prior to seismic qualification testing. This paper elaborates on key aspects of the static pull test method supported by the test results for a cabinet framework and a configured cabinet relative to the seismic test results. The paper also discusses sine sweep testing of a battery cabinet and results of two modal test methods used on the corresponding battery rack. Finally, this paper describes modal FEA of the same battery rack anchored to a concrete pad supported by a polystyrene plastic foam sheet and explains the correlation of the numerical results with the experimental modal analysis results. The correlated model serves as the baseline model for analyzing other battery racks and equipment cabinets configured with batteries.

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Chang, Seongkyu, Weipeng Sun, Sung Gook Cho, and Dookie Kim. "Vibration Control of Nuclear Power Plant Piping System Using Stockbridge Damper under Earthquakes." Science and Technology of Nuclear Installations 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/5014093.

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Generally the piping system of a nuclear power plant (NPP) has to be designed for normal loads such as dead weight, internal pressure, temperature, and accidental loads such as earthquake. In the proposed paper, effect of Stockbridge damper to mitigate the response of piping system of NPP subjected to earthquake is studied. Finite element analysis of piping system with and without Stockbridge damper using commercial software SAP2000 is performed. Vertical and horizontal components of earthquakes such as El Centro, California, and Northridge are used in the piping analysis. A sine sweep wave is also used to investigate the control effects on the piping system under wide frequency range. It is found that the proposed Stockbridge damper can reduce the seismic response of piping system subjected to earthquake loading.

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