Relevant bibliographies by topics / Sweep excitation

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Sweep excitation'

Author: Grafiati
Published: 3 June 2025
Last updated: 22 June 2025

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Journal articles on the topic "Sweep excitation"

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Reina, Salvatore, Cèsar Ayabaca, Diego Venegas, et al. "Experimental Validation in a Controlled Environment of a Methodology for Assessing the Dynamic Behavior of Railway Track Components." Machines 10, no. 5 (2022): 394. http://dx.doi.org/10.3390/machines10050394.

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This article presents a novel methodology conducted under controlled laboratory conditions to assess the dynamic behavior of the components of railway tracks by applying an unbalanced mass excitation force. The methodology for obtaining accurate measurements, which uses different excitation parameters, is based on an unbalanced mass device, and from these data, the transmissibility of the mass-elastomer system is estimated. For assessment of the dynamic behavior, different sine sweep rate excitations, the unbalanced mass, and background noise are considered. The experimental measurements of transmissibility with a shaker and an unbalanced mass device are performed to validate the methodology. For this, frequency-by-frequency transmissibility measurements and the swept sine were performed by the shaker, with a sine sweep from 1 to 51 Hz, using the unbalanced mass device with different sine sweep rates and unbalanced mass. The results obtained allow comparison of the transmissibility by excitation at specific frequencies and the sine sweep to validate the excitation parameters of the unbalanced mass device. Thus, a transmissibility estimation error with the sweep rate, the unbalanced mass, and the background noise is developed. By using the proposed methodology, it is possible to lower the error of the estimated transmissibility of the system with background noise.
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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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Villeneuve, Eric, Christophe Volat, and Sebastian Ghinet. "Numerical and Experimental Investigation of the Design of a Piezoelectric De-Icing System for Small Rotorcraft Part 2/3: Investigation of Transient Vibration during Frequency Sweeps and Optimal Piezoelectric Actuator Excitation." Aerospace 7, no. 5 (2020): 49. http://dx.doi.org/10.3390/aerospace7050049.

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The objective of this research project is divided in four parts: (1) to design a piezoelectric actuator based de-icing system integrated to a flat plate experimental setup, develop a numerical model of the system and validate experimentally; (2) use the experimental setup to investigate actuator activation with frequency sweeps and transient vibration analysis; (3) add an ice layer to the numerical model, predict numerically stresses at ice breaking and validate experimentally; and (4) implement the concept to a blade structure for wind tunnel testing. This paper presents the second objective of this study, in which the experimental setup designed in the first phase of the project is used to study transient vibration occurring during frequency sweeps. Acceleration during different frequency sweeps was measured with an accelerometer on the flat plate setup. The results obtained showed that the vibration pattern was the same for the different sweep rate (in Hz/s) tested for a same sweep range. However, the amplitude of each resonant mode increased with a sweep rate decrease. Investigation of frequency sweeps performed around different resonant modes showed that as the frequency sweep rate tends towards zero, the amplitude of the mode tends toward the steady-state excitation amplitude value. Since no other transient effects were observed, this signifies that steady-state activation is the optimal excitation for a resonant mode. To validate this hypothesis, the flat plate was installed in a cold room where ice layers were accumulated. Frequency sweeps at high voltage were performed and a camera was used to record multiple pictures per second to determine the frequencies where breaking of the ice occur. Consequently, the resonant frequencies were determined from the transfer functions measured with the accelerometer versus the signal of excitation. Additional tests were performed in steady-state activation at those frequencies and the same breaking of the ice layer was obtained, resulting in the first ice breaking obtained in steady-state activation conditions as part of this research project. These results confirmed the conclusions obtained following the transient vibration investigation, but also demonstrated the drawbacks of steady-state activation, namely identifying resonant modes susceptible of creating ice breaking and locating with precision the frequencies of the modes, which change as the ice accumulates on the structure. Results also show that frequency sweeps, if designed properly, can be used as substitute to steady-state activation for the same results.
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Fuzessery, Zoltan M., Marlin D. Richardson, and Michael S. Coburn. "Neural Mechanisms Underlying Selectivity for the Rate and Direction of Frequency-Modulated Sweeps in the Inferior Colliculus of the Pallid Bat." Journal of Neurophysiology 96, no. 3 (2006): 1320–36. http://dx.doi.org/10.1152/jn.00021.2006.

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This study describes mechanisms that underlie neuronal selectivity for the direction and rate of frequency-modulated sweeps in the central nucleus of the inferior colliculus (ICC) of the pallid bat ( Antrozous pallidus). This ICC contains a high percentage of neurons (66%) that respond selectively to the downward sweep direction of the bat's echolocation pulse. Some (19%) are specialists that respond only to downward sweeps. Most neurons (83%) are also tuned to sweep rates. A two-tone inhibition paradigm was used to describe inhibitory mechanisms that shape selectivity for sweep direction and rate. Two different mechanisms can create similar rate tuning. The first is an early on-best frequency inhibition that shapes duration tuning, which in turn determines rate tuning. In most neurons that are not duration tuned, a delayed high-frequency inhibition creates rate tuning. These neurons respond to fast sweep rates, but are inhibited as rate slows, and delayed inhibition overlaps excitation. In these neurons, starting a downward sweep within the excitatory tuning curve eliminates rate tuning. However, if rate tuning is shaped by duration tuning, this manipulation has no effect. Selectivity for the downward sweep direction is created by an early low-frequency inhibition that prevents responses to upward sweeps. In addition to this asymmetry in arrival times of low- and high-frequency inhibitions, the bandwidth of the low-frequency sideband was broader. Bandwidth influences the arrival time of inhibition during an FM sweep because a broader sideband will be encountered sooner. These findings show that similar spectrotemporal filters can be created by different mechanisms.
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de Barros, Everaldo, Carlos d’Andrade Souto, and Mauro Hugo Mathias. "Experimental Observation Of Nonlinear Vibrations Using A Closed-Loop Vibration System." Metrology and Measurement Systems 22, no. 4 (2015): 559–64. http://dx.doi.org/10.1515/mms-2015-0045.

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Abstract This paper presents experimental observation of nonlinear vibrations in the response of a flexible cantilever beam to transverse harmonic base excitations around its flexural mode frequencies. In the experimental setup, instead of manual control of the signal excitation frequency and amplitude, a closed-loop vibration system is used to keep the excitation amplitude constant during the frequency sweep and to increase confidence in the experimental results. The experimental results show the presence of the third mode in the response when varying the excitation frequency around the fourth mode. The frequency-response curves, response spectrum and Poincaré plots were used for characterization of nonlinear dynamic behaviour of the beam.
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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 (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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Razak, Khaleel A., and Zoltan M. Fuzessery. "GABA Shapes Selectivity for the Rate and Direction of Frequency-Modulated Sweeps in the Auditory Cortex." Journal of Neurophysiology 102, no. 3 (2009): 1366–78. http://dx.doi.org/10.1152/jn.00334.2009.

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In the pallid bat auditory cortex and inferior colliculus (IC), the majority of neurons tuned in the echolocation range is selective for the direction and rate of frequency-modulated (FM) sweeps used in echolocation. Such selectivity is shaped mainly by spectrotemporal asymmetries in sideband inhibition. An early-arriving, low-frequency inhibition (LFI) shapes direction selectivity. A delayed, high-frequency inhibition (HFI) shapes rate selectivity for downward sweeps. Using iontophoretic blockade of GABAa receptors, we show that cortical FM sweep selectivity is at least partially shaped locally. GABAa receptor antagonists, bicuculline or gabazine, reduced or eliminated direction and rate selectivity in ∼50% of neurons. Intracortical GABA shapes FM sweep selectivity by either creating the underlying sideband inhibition or by advancing the arrival time of inhibition relative to excitation. Given that FM sweep selectivity and asymmetries in sideband inhibition are already present in the IC, these data suggest a refinement or recreation of similar response properties at the cortical level.
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Yabuno, Hiroshi, Masahiko Hasegawa, and Manami Ohkuma. "Bifurcation control for a parametrically excited cantilever beam by linear feedback." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 8 (2012): 1987–99. http://dx.doi.org/10.1177/0954406212442603.

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In this article, we propose a bifurcation control method for a parametrically excited cantilever beam by linear feedback. Quadratic damping plays a dominant role in the nonlinear response of the parametrically excited cantilever beam, and two transcritical bifurcations can exist in the frequency–response curve. In the relatively high-amplitude excitation or in sweeping the excitation amplitude, there are two saddle-node bifurcations in addition to the transcritical bifurcations. The discontinuous bifurcation as a saddle-node bifurcation induces jumping phenomena in the sweeps of the excitation amplitude and the excitation frequency. In this article, we focus on the case of the excitation amplitude sweep and propose a control method to avoid the jumping phenomena by bifurcation control, i.e. by shifting the bifurcation set based on the linear feedback. The validity of the control method is experimentally confirmed using a simple apparatus.
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Razak, K. A. "Mechanisms underlying intensity-dependent changes in cortical selectivity for frequency-modulated sweeps." Journal of Neurophysiology 107, no. 8 (2012): 2202–11. http://dx.doi.org/10.1152/jn.00922.2011.

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Frequency-modulated (FM) sweeps are common components of species-specific vocalizations. The intensity of FM sweeps can cover a wide range in the natural environment, but whether intensity affects neural selectivity for FM sweeps is unclear. Bats, such as the pallid bat, which use FM sweeps for echolocation, are suited to address this issue, because the intensity of echoes will vary with target distance. In this study, FM sweep rate selectivity of pallid bat auditory cortex neurons was measured using downward sweeps at different intensities. Neurons became more selective for FM sweep rates present in the bat's echolocation calls as intensity increased. Increased selectivity resulted from stronger inhibition of responses to slower sweep rates. The timing and bandwidth of inhibition generated by frequencies on the high side of the excitatory tuning curve [sideband high-frequency inhibition (HFI)] shape rate selectivity in cortical neurons in the pallid bat. To determine whether intensity-dependent changes in FM rate selectivity were due to altered inhibition, the timing and bandwidth of HFI were quantified at multiple intensities using the two-tone inhibition paradigm. HFI arrived faster relative to excitation as sound intensity increased. The bandwidth of HFI also increased with intensity. The changes in HFI predicted intensity-dependent changes in FM rate selectivity. These data suggest that neural selectivity for a sweep parameter is not static but shifts with intensity due to changes in properties of sideband inhibition.
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Li, Haining, Kefu Liu, and Jian Deng. "Modeling and Evaluation of a Multi-Stable Hybrid Energy Harvester." Vibration 7, no. 3 (2024): 662–86. http://dx.doi.org/10.3390/vibration7030035.

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This article develops a multi-stable hybrid energy harvester (MSHEH) which consists of a piezoelectric energy harvester (PEH) and an electromagnetic energy harvester (EMEH). By tuning two parameters, the MSHEH can achieve a mono-stable, bi-stable, and tri-stable state, respectively. A numerical procedure is developed to compute the EMEH’s transduction factor. The obtained result is validated experimentally. Using the equivalent magnetic 2-point dipole theory, the restoring force model of the magnetic spring is established. The obtained model is verified experimentally. The energy harvesting performances of the MSHEH under the four different configurations (linear, mono-stable, bi-stable and tri-stable) subjected to frequency sweep excitations are evaluated by simulation and validated by experiment. The comparative analysis focuses on power output, accumulated harvested energy, and effective energy-harvesting bandwidth. The optimum load resistances are investigated by Pareto front optimizations. The following key findings are obtained. When subjected to high-level frequency sweep excitation, the tri-stable configuration exhibits the widest frequency bandwidth and the highest total accumulated harvested energy. When subjected to low-level frequency sweep excitation, the bi-stable configuration is more efficient in energy harvesting. The best performance trade-off between the PEH and EMEH can be achieved by selecting the optimum load resistances properly.
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Dissertations / Theses on the topic "Sweep excitation"

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Marsden, Catharine Chauvin. "Identification of aeroelastic parameters using sweep excitation." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33336.

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The method of sweep excitation is employed in the resonance testing of aircraft and other structures. The method allows resonant frequencies and corresponding modal damping parameters to be calculated from a limited amount of real time test data. The amount of test time required to obtain the system's frequency response characteristics is reduced by subjecting the structure to an entire range of frequencies within one test pattern, or "sweep", instead of repeating individual tests at a number of different frequencies. The "sweep-rate" is defined as the rate at which the frequency increases or decreases during the frequency sweep. This thesis studies the effect of sweep-rate and sweep-direction on the accuracy of estimated system parameters, as well as assessing two different methods used to reduce discrete time histories to frequency transfer data. The impact of introducing a structural nonlinearity into the aeroelastic system is also investigated. (Abstract shortened by UMI.)
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Vondruš, Jiří. "Návrh a konstrukce modelu automatické galvanizační linky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217635.

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This thesis deals with the design of automated system of electroplating. The first part is centered on designing the technological process for this electroplating and the setout of operating vats. It also deals with the project of mechanical construction, electrical system, with the computing procedure and the optimum choice of gear for galvanic line model. The work includes the design of a DC motor controller, the computing procedure and the construction of heating element for vats heater simulation. The last part of this thesis offers an insight to the control system and the assembled program. In the addendum, the photo of the realized model, the wiring scheme, and the programme transcript for control galvanic line model can be found.
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Book chapters on the topic "Sweep excitation"

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Hoople, Gordon, and Kevin Napolitano. "Implementation of Multi-Sine Sweep Excitation on a Large-Scale Aircraft." In Structural Dynamics, Volume 3. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9834-7_126.

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Zhang, Shaoyun, and Runyu Lu. "Application of Frequency-Spatial Domain Decomposition (FSDD) Method in Flutter Modal Analysis Under Sweep Excitation." In Lecture Notes in Electrical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-2440-9_33.

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Camacho-Tauta Javier, Ali Hassan, Cascante Giovanni, and Viana da Fonseca António. "Frequency domain method in bender element testing – experimental observations." In Advances in Soil Mechanics and Geotechnical Engineering. IOS Press, 2015. https://doi.org/10.3233/978-1-61499-601-9-398.

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In bender element (BE) testing, shear-wave velocities are measured using two main methods: time (pulse excitation) and frequency (sine sweep excitation) domain analysis. The time domain analysis is simple but requires subjective judgment for the non-automatic determination of the arrival time. Conversely, the frequency domain analysis can be performed automatically. However, its results show high variability because they are affected by the selection of different variables such as the frequency content of the excitation, the resonant frequency of the BE system, and the resolution of the frequency domain analysis. The reliability of the frequency domain method is studied in this paper by using experimental results from bender element and resonant column tests. Laboratory results show that amplification peaks in the transfer function of the BE system can significantly affect the shear wave velocity measurements (up to 300%). In addition, the high correlations coefficients typically observed at high frequencies are finally explained. A modified frequency domain analysis is proposed to enhance the reliability of the method using a high frequency narrowband excitation outside the resonant peaks of the BE system. Results from the modified frequency domain analysis tests show less than 10% error in the measurement of the shear wave velocity with respect to the RC results.
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Panteliou, Sofia. "New Diagnostic and Monitoring Method for Osteoporosis." In Handbook of Research on Trends in the Diagnosis and Treatment of Chronic Conditions. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-8828-5.ch001.

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Osteoporosis is chronic disease affecting most postmenopausal females and 30% of males with biological, behavioral and financial consequences. A non invasive method to assess bone structural integrity is presented, based on in-vitro or in-vivo measurement of bone dynamic characteristics (Modal Damping Factor) by applying vibration excitation in the range of acoustic frequencies, in the form of an acoustic sweep signal. This method has been applied on metallic structures and composites, including bones, and is supported by analytical and arithmetic tool based on model's theory. Experimental MDF results are compared to results acquired with conventional methods for bone quality assessment and show impressive correlations between damping factor and indices of bone quality in an advantageous manner. Evaluation of these research findings strengthens the potential of the proposed method to consist a valuable assessment tool for diagnosis and monitoring of bone integrity, in metabolic bone diseases, especially osteoporosis.
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Panteliou, Sofia. "New Diagnostic and Monitoring Method for Osteoporosis." In Medical Imaging. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0571-6.ch076.

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Osteoporosis is chronic disease affecting most postmenopausal females and 30% of males with biological, behavioral and financial consequences. A non invasive method to assess bone structural integrity is presented, based on in-vitro or in-vivo measurement of bone dynamic characteristics (Modal Damping Factor) by applying vibration excitation in the range of acoustic frequencies, in the form of an acoustic sweep signal. This method has been applied on metallic structures and composites, including bones, and is supported by analytical and arithmetic tool based on model's theory. Experimental MDF results are compared to results acquired with conventional methods for bone quality assessment and show impressive correlations between damping factor and indices of bone quality in an advantageous manner. Evaluation of these research findings strengthens the potential of the proposed method to consist a valuable assessment tool for diagnosis and monitoring of bone integrity, in metabolic bone diseases, especially osteoporosis.
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Miura, Noboru. "Cyclotron Resonance and Far-Infrared Spectroscopy." In Physics of Semiconductors in High Magnetic Fields. Oxford University PressOxford, 2007. http://dx.doi.org/10.1093/oso/9780198517566.003.0004.

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Abstract Cyclotron resonance is a powerful tool to determine the effective mass of carriers, and to study energy band structure, electronic states, electron interactions with other elementary excitations, and electron-electron excitations. There are two ways to observe cyclotron resonance. One is by fixing the magnetic field constant and varying the wavelengh of the incident eletromagnetic radiation. The other method is to sweep the magnetic field at a constant wavelength. The latter is particularly suitable for pulsed high magnetic fields, since the magnetic field is automatically swept and hits the resonance when a monochromatic light is incident on a sample. High magnetic fields are advantageous in many ways for cyclotron resonance.
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Conference papers on the topic "Sweep excitation"

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Lei, Ming. "Research on Structural Response Modeling Method for Flutter Flight Test Under Sweep Excitation of Control Surface Based on Volterra Series." In 2024 3rd International Symposium on Aerospace Engineering and Systems (ISAES). IEEE, 2024. http://dx.doi.org/10.1109/isaes61964.2024.10751649.

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Munkes, Fabian, Patrick Kaspar, Alexander Trachtmann, et al. "Rydberg excitation efficiency in nitric oxide using a three photon excitation scheme." In CLEO: Fundamental Science. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_fs.2024.fm3r.5.

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Jha, Rajesh K., and Robert G. Parker. "Nonlinear Oscillations of a Particle in the Plane Under Longitudinal End Excitation." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48604.

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We study the forced vibrations of a two degree of freedom lumped parameter model of a belt span under longitudinal excitation. The belt inertia is modelled as a particle and the belt elasticity is modelled by two identical linear springs. Numerical integration is used to calculate free responses and perform frequency and amplitude sweeps. Frequency sweep results indicate parametric resonances, jump phenomena, sub- and super-harmonic responses, quasiperiodicity and chaos. Amplitude sweep at a low frequency shows bifurcations of limit cycles and the period doubling route to chaos. Poincare sections are computed to show the chaotic nature of the responses.
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Jiaotong, Lu, Hu Lixin, Zhou Tong, Zhou Sheng, and Zhao Guoyong. "Time-varient slip sweep excitation time-distance optimization technology." In International Geophysical Conference, Beijing, China, 24-27 April 2018. Society of Exploration Geophysicists and Chinese Petroleum Society, 2018. http://dx.doi.org/10.1190/igc2018-050.

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Ivler, Christina, Mark Tischler, Elizabeth Rowe, James Martin, and Mark Lopez. "System Identification Guidance for Multirotor Aircraft: Dynamic Scaling and Test Techniques." In Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14754.

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State-space system identification was performed in order to extract flight dynamic models for hovering flight of a 56 cm, 1.56 kg hexacopter unmanned aerial vehicle (UAV). Different input excitation techniques were tested to determine which maneuvers provided high quality system identification results for small scale multirotor vehicles. These input excitation techniques included automated frequency sweeps, varying in amplitude, and multi-sine sweeps. Coherence, Cramer-Rao bounds, and insensitivities were used as metrics for comparing the system identification results. A parametric variation of frequency sweep amplitudes were performed in all axes (roll, yaw, pitch and heave) in order to provide guidance on frequency sweep amplitude for small scale multirotor unmanned aerial systems (UAS). The dynamics of the 56 cm hexacopter were used to estimate the dynamics of a larger 127 cm hexacopter via Froude scaling based on hub-to-hub distance as the characteristic length. The scaled results were compared to an actual system identification model of a 127 cm hexacopter.
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Emam, Samir A., Jared Hobeck, and Daniel J. Inman. "Experimental Study of Nonlinear Vibration Energy Harvesting of a Bistable Composite Laminate." In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3717.

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This study is at attempt to explore the nonlinear behavior of bistable composite laminates for vibration energy harvesting. Asymmetric four-ply [0/90/0/90] carbon-fiber plate with two cylindrical stable equilibria supported at its center and free at all boundaries is used for the experimental testing. Macro-fiber composite (MFC) patches are attached to the plate to transform the mechanical vibration energy into electrical energy. The mechanical bistable property of the plate makes it possible to snap from one stable equilibrium state to the other. This snapthrough motion is highly nonlinear and associated with large-amplitude vibrations. The experimental tests aim at exploiting the nonlinearity due to the snapthrough motion to enhance the energy extraction. First, the resonant frequencies and damping of the plate are identified. A primary-resonance excitations of the first mode are carried out using two schemes: amplitude sweep and frequency sweep. In the first case, amplitude sweep, the excitation frequency is kept fixed at the resonant frequency and the amplitude of excitation is increased. The time history and FFT of the response as well as the output voltage are measured and reported. In the second case, frequency sweep, the excitation frequency is varied around the resonant frequency while the excitation amplitude is kept fixed. In both cases, the response shows a small-amplitude single-well vibrations at low excitation amplitudes and chaotic and periodic snapthrough motion as the amplitude and frequency of excitation are varied. The snapthrough motion has been found to greatly enhance the energy extraction capability. This study can serve as a motive for more testing and modeling efforts in order to understand the complex nonlinear behavior of bistable composite laminates and exploit it for vibration energy harvesting.
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Marsden, Catharine, and Stuart Price. "Modal damping identification for a structurally nonlinear airfoil using sweep excitation." In 19th AIAA Applied Aerodynamics Conference. American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-1590.

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Walther, R., and A. Kacem. "Building Structural Response to Sine Sweep and Maximum Length Sequence Excitation." In 10th Convention of the European Acoustics Association Forum Acusticum 2023. European Acoustics Association, 2022. http://dx.doi.org/10.61782/fa.2023.0861.

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Emam, Samir A., Meghashyam Panyam, and Mohammed F. Daqaq. "Exploiting the Subharmonic Parametric Resonance of a Bi-Stable Beam for Energy Harvesting." In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3799.

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We investigate the potential of harvesting vibration energy via a bi-stable beam subjected to subharmonic parametric excitations. The vibrating structure is a buckled beam with two stable equilibria separated by a potential barrier. The beam is subjected to a superposition of a static axial load beyond its critical buckling load and a harmonic axial excitation which frequency is around twice the frequency of the first vibration mode. A micro-fiber composite (MFC) is attached to one side of the beam to convert the strain energy resulting from the beams oscillation into electricity. The study considers two regimes of excitations: an amplitude sweep and a frequency sweep. In the first regime, the amplitude of excitation is varied while the excitation frequency is tuned at twice the natural frequency of the first vibration mode. In the second regime, the excitation frequency is swept forward and backward around the subharmonic resonant frequency while the amplitude of excitation is kept constant. A theoretical model which governs the electromechanical coupling of the transverse vibrations of the beam and the output voltage is used to monitor the response as the excitation parameters are changed. An experimental setup is built and a series of tests is performed. The theoretical results are in good agreement with their experimental counterparts. The experiment also shows that this type of bi-stable energy harvesters exhibits a broadband frequency response as compared to the classical linear harvesters.
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Neal, H. L., and A. H. Nayfeh. "Response of a Parametrically-Excited System to a Nonstationary Excitation." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0124.

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Abstract The response of a single-degree-of-freedom system to a nonstationary excitation is investigated by using the method of multiple scales as well as analog- and digital-computer simulations. The unexcited system has one focus and two saddle points. The system can be used to model rolling of ships in head or follower seas. The method of multiple scales is used to derive equations governing the modulation of the amplitude and phase of the response. The modulation equations are used to find the stationary solutions and their stability. The response to nonstationary excitations is found by integrating the original governing equation as well as the modulation equations. There is good agreement between the results of both approaches. For some frequency and amplitude sweeps, the nonstationary response found from integrating the original governing equation exhibits behaviors that are analogous to symmetry-breaking bifurcations, period-doubling bifurcations, chaos, and unboundedness present in the stationary case. The maximum response amplitude and the excitation amplitude or frequency at which the response becomes unbounded are found as functions of the sweep rate. The results of the digital-computer simulations are verified with an analog computer.
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