Relevant bibliographies by topics / Amplitude-frequency characteristic

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Amplitude-frequency characteristic'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 July 2025

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Journal articles on the topic "Amplitude-frequency characteristic"

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Abramov, Y., V. Kryvtsova, and A. Mikhailyuk. "DETERMINATION OF THE RELIABILITY OF THE GAS GENERATOR OF THE STORAGE SYSTEM AND HYDROGEN SUPPLY." Municipal economy of cities 3, no. 177 (2023): 142–46. http://dx.doi.org/10.33042/2522-1809-2023-3-177-142-146.

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It is noted that as a generalized characteristic of the functional gas generator, which is sensitive to variations in its parameters, it is advisable to use the transfer function, or its analogue - the amplitude-phase frequency characteristic of the gas generator. The amplitude-phase frequency characteristic of the gas generator includes two components - amplitude-frequency and phase-frequency characteristics. During the operation of the gas generator, there will be variations in its parameters - transmission coefficient and time constants, due to aging processes and the influence of external
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Peng, Pai, Hui Du, Gang Wei, et al. "Experimental Investigation on the Vertical Structure Characteristics of Internal Solitary Waves." Journal of Marine Science and Engineering 10, no. 8 (2022): 1045. http://dx.doi.org/10.3390/jmse10081045.

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An experimental investigation of the vertical structure characteristics of internal solitary waves (ISWs) was systematically carried out in a large gravitationally stratified fluid flume. Four different stratifications were established, and basic elements of ISWs were measured by a conductivity probe array. The vertical distributions of the amplitude, characteristic frequency and waveform of two types of ISWs under different stratifications were obtained, and the experimental results were compared with the theoretical model. The study shows that most vertical structures of the amplitude under
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Violeta, Alexandrova, and Spiridonova Pavlina. "AMPLITUDE AND FREQUENCY MODULATION – A CHARACTERISTIC OF CANINE SOUNDGRAMS." TRADITION AND MODERNITY IN VETERINARY MEDICINE 6, no. 2 (2021): 15–20. https://doi.org/10.5281/zenodo.5733958.

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Zhang, Rongrong, and A. Bazhanov. "Energy Circuit of 1.3 MW with Brayton Cycle." Bulletin of Science and Practice 10, no. 6 (2024): 422–32. http://dx.doi.org/10.33619/2414-2948/103/44.

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In this paper, a constructive scheme of the experimental device is proposed, and the principle of its operation is described in detail. The power circuit of the device has been drawn up. Complex impedance, frequency function, amplitude frequency characteristic and phase-frequency characteristic are obtained by mathematical transformation of the power circuit. The frequency response of the circuit is constructed. As a result of the calculations, we will obtain the amplitude frequency response and the phase frequency response. Using the found values of the characteristics, we will build graphs a
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Yu, Liang Jun, Li Hua Sun, and Cui Cui Huang. "Design of Comprehensive Test Instrument Based on FPGA and Cortex-M0." Applied Mechanics and Materials 312 (February 2013): 583–87. http://dx.doi.org/10.4028/www.scientific.net/amm.312.583.

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The design consists of three modules: the voltage amplitude measurement module, the level oscillator module and the amplitude-frequency characteristic test module. The voltage amplitude measurement module uses AD817 to consist three-stage amplifier. The magnification of each level can be adjusted for 1 times/10 times. At the same time, the author uses the Cortex-M0 for controlling the relay switch to achieve automatic range conversion. The principle of DDS is adopted in the level oscillator module. FPGA is used for realizing the phase accumulator, the phase modulator, the sine ROM look-up tabl
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Klaerner, Matthias, Mario Wuehrl, Lothar Kroll, and Steffen Marburg. "Characteristic amplitude-frequency functions of the radiated sound power." Journal of the Acoustical Society of America 141, no. 5 (2017): 4034. http://dx.doi.org/10.1121/1.4989301.

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Sytnikov, T. V. "INCREASING Q-FACTOR OF THE DIGITAL SENSOR SIGNALS PROCESSING PATH IN AUTONOMOUS MOBILE ROBOTIC PLATFORMS WITH LIMITED COMPUTING RESOURCES." ELECTRICAL AND COMPUTER SYSTEMS, no. 39(115) (2024): 26–34. http://dx.doi.org/10.15276/eltecs.39.115.2024.3.

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Abstract. The paper is considered the problem of constructing autonomous mobile robotic platform with the possibility of rearranging their characteristics depending on the operating conditions. A new approach is proposed for calculating the parameters of a new connection with a series connection of low-order components of the same type. The resulting ratio allows you to accurately calculate the frequencies of the n-th connection of the same type components. Such a connection allows increasing the quality factor characteristic of the amplitude frequency characteristic and reducing the bandwidth
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Паровик, Р. И. "Анализ добротности вынужденных колебаний дробного линейного осциллятора". Журнал технической физики 90, № 7 (2020): 1059. http://dx.doi.org/10.21883/jtf.2020.07.49436.233-19.

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Using the harmonic balance method, analytical formulas are obtained for calculating the amplitude-frequency and phase-frequency characteristics, as well as the quality factor of the forced oscillations of a linear fractional oscillator. It was established that the characteristics under study depend on the dissipative properties of the medium - memory effects, which are described by derivatives of fractional orders. It is shown that fractional orders affect the attenuation of the oscillatory process and are associated with its quality factor. The calculated curves of the characteristics of the
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Abramov, Y., V. Kryvtsova, and A. Mikhailyuk. "JUSTIFICATION OF THE METHOD OF DETERMINATION OF THE CONSTANT TIME OF THE GAS GENERATOR OF THE SYSTEM OF STORAGE AND SUPPLY OF HYDROGEN." Municipal economy of cities 3, no. 163 (2021): 216–20. http://dx.doi.org/10.33042/2522-1809-2021-3-163-216-220.

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The method of determining the dynamic parameter - the time constant of the gas generator of the storage and supply of hydrogen on the basis of the hydro-reactive composition is substantiated. The method is based on the use of the amplitude-frequency characteristics of the gas generator of the storage and supply system of hydrogen. The method involves the implementation of three stages. At the first stage, the mathematical dependence of the gas generator time constant on its static parameter and amplitude-frequency characteristic at a fixed frequency is obtained. In the second stage, the choice
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Xu, Lu, Hongsheng Li, Jia Liu, Yunfang Ni, and Libin Huang. "Research on Nonlinear Dynamics of Drive Mode inZ-Axis Silicon Microgyroscope." Journal of Sensors 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/801618.

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A novel drive method is proposed to increase the vibration amplitude of drive mode of silicon vibratory gyroscopes based on the nonlinear dynamics research made in this paper. A nonlinear dynamic equation, considering the nonlinear mechanical-elastic and electrostatic force, was firstly deduced according to the simplified structure schematic of drive mode. Then, experiments were made to characterize the nonlinear amplitude-frequency response characteristic as well as its dependence on drive voltage. Besides, by solving the nondimensional nonlinear dynamics using Matlab and Simulink, the influe
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Dissertations / Theses on the topic "Amplitude-frequency characteristic"

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Černý, Ondřej. "Stanovení druhé viskozity kapaliny z měřených tlakových pulsací." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229379.

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Diploma thesis deals with problem of assessment of the second viscosity and acoustic velocity coefficients by the different liquid´s flow in pipe from measured pressure pulstation created by diaphragm pulsator. For the solution is used a transfer matrix model and for the data evaluation a genetic algorithm in „Facharp.exe“ program. Modal analysis in problematic part of the measured stand is realized to find a wave shapes and natural frequency of a pipe. The results are for the reason of clearness processed into „MS Excel“ program and fetched to the charts which shows depedence of a second visc
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Guzej, Michal. "Rotující odtržení v prostoru odstředivého kompresoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230025.

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This thesis deals with a procedure for determining the complete processing of aerodynamic flow instabilities (rotating stall and surge) in a centrifugal compressor. At small flows the performance of a compressor system is limited by the surge line, which is caused by flow instabilities. Numerical solution is obtained using the method of transfer matrix. This system is simulated through several models with local resistances that represent the dissipation of pressure energy. Pulses are excitated in these models by the pressure jump placed before the centrifugal compressor. From the frequency-amp
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Slavíček, Ondřej. "Dynamické charakteristiky běžně používaných snímačů tlaku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254445.

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This thesis deals with the dynamic properties of electric pressure transducers. These are properties that are reflected in the measurement of rapid, time-dependent processes. They could be described in two ways. Either by using amplitude and phase frequency response characteristics, or just one particular value. Natural frequency, cutoff frequency or time constant. These parameters indicate the extreme values for the use of measuring devices in the measurement of time-dependent processes. In this work will be described procedures for determining these parameters.
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Vig, Jyotika. "ISM Band Indoor Wireless Channel Amplitude Characteristics: Path Loss and Gain vs. Distance and Frequency." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1091111060.

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Sucic, Victor. "Parameters selection for optimising time-frequency distributions and measurements of time-frequency characteristics of nonstationary signals." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15834/1/Victor_Sucic_Thesis.pdf.

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The quadratic class of time-frequency distributions (TFDs) forms a set of tools which allow to effectively extract important information from a nonstationary signal. To determine which TFD best represents the given signal, it is a common practice to visually compare different TFDs' time-frequency plots, and select as best the TFD with the most appealing plot. This visual comparison is not only subjective, but also difficult and unreliable especially when signal components are closely-spaced in the time-frequency plane. To objectively compare TFDs, a quantitative performance measure should be u
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Sucic, Victor. "Parameters Selection for Optimising Time-Frequency Distributions and Measurements of Time-Frequency Characteristics of Nonstationary Signals." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15834/.

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The quadratic class of time-frequency distributions (TFDs) forms a set of tools which allow to effectively extract important information from a nonstationary signal. To determine which TFD best represents the given signal, it is a common practice to visually compare different TFDs' time-frequency plots, and select as best the TFD with the most appealing plot. This visual comparison is not only subjective, but also difficult and unreliable especially when signal components are closely-spaced in the time-frequency plane. To objectively compare TFDs, a quantitative performance measure should be u
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Lott, Gus K. Jr. "High Frequency (HF) radio signal amplitude characteristics, HF receiver site performance criteria, and expanding the dynamic range of HF digital new energy receivers by strong signal elimination [electronic resource]." Thesis, Monterey, California: Naval Postgraduate School, 1990. http://hdl.handle.net/10945/34806.

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Approved for public release; distribution unlimited.<br>The dissertation discusses High Frequency (HF) radio sources. It consolidates data from all available, published HF spectrum surveys. The author conducted a new HF survey using detection of new energy events. The first cumulative probability distribution function for the amplitude of detected non-broadcast HF signals is developed, and the distribution is log-normal. HF receiver site performance quantification is possible using the HF signal distributions. Site performance degradation results from noise, interference, and signal path atten
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Дубицька, Марія Сергіївна, Мария Сергеевна Дубицкая та M. S. Dubyts’ka. "Вдосконалення способу прогнозу диз’юнктивних порушень методом акустичної геолокації при відпрацюванні пологозалягаючих вугільних пластів". Thesis, Видавництво НГУ, 2014. http://ir.nmu.org.ua/handle/123456789/3692.

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У дисертації вирішене актуальне науково-технічне завдання підвищення ефективності прогнозу мілкоамплітудних геологічних порушень вугільних пластів методом неруйнівного контролю до 95%. Запропонована і обґрунтована математична модель розповсюдження акустичного хвильового пакету в дисперсійному породному середовищі, заснована на інформаційній амплітудно-фазовій модуляції несучих частот зондуючого сигналу. Розроблено ефективний спосіб прогнозу прихованих диз'юнктивів у вугільних пластах методом неруйнівного контролю. У його основу покладено аналіз особливостей прояву розривних геологічни
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Лисенко, Юлія Юріївна. "Інформаційно–діагностична система імпульсного вихрострумового неруйнівного контролю виробів машинобудування". Doctoral thesis, Київ, 2017. https://ela.kpi.ua/handle/123456789/21603.

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Дисертація присвячена розробці інформаційно – діагностичної системи імпульсного вихрострумового неруйнівного контролю виробів машинобудування. В роботі проаналізовано процеси в ланцюгах вихрострумового перетворювача в умовах імпульсному режиму збудження та визначено умови виникнення загасаючих гармонічних коливань, що дозволило в якості інформативних параметрів сигналів вихрострумового перетворювача запропонувати використання їх власної частоти та коефіцієнта загасання. В роботі розроблено методику обробки та аналізу інформативних параметрів сигналів вихрострумового перетворювача в імпульсно
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Sergeev, S. A., V. B. Klepikov, and K. V. Mahotilo. "Amplitude-Frequency Characteristic of a Neural Control Based DC Drive." Thesis, 1996. http://repository.kpi.kharkov.ua/handle/KhPI-Press/30477.

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The paper interprets characteristics of a neural-control-based DC servodrive in terms of the classical theory of automatic control. It also touches on the problem of choosing training patterns to synthesize a nonlinear PID-controller with a desired amplitude-frequency characteristic and analyses the efficiency of using for this purpose input signals in form of a step function and a harmonic one. Synthesis of the neurocontroller has been performed within the framework of a three-layer perceptron. To train it, a genetic algorithm has been developed.
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Books on the topic "Amplitude-frequency characteristic"

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Vaicis, Ivo. Shape Optimization of Mechanical System Elements Considering Uncertainty. RTU Press, 2022. http://dx.doi.org/10.7250/9789934227356.

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In the Thesis a new method is developed for optimising the shape of mechanical elements by considering the interaction of these elements with a multiphase uncertainty environment whose approximation model achieves a significant number of degrees of freedom (DOF). The Thesis analyses the process of dust formation during the handling of granular material. Different experimental designs are used to derive metamodels and to analyse the segregation of granular material in the silo discharge depending on the oscillation frequency, amplitude, and geometrical characteristics of the silo.
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Tibaldi, Stefano, and Franco Molteni. Atmospheric Blocking in Observation and Models. Oxford University Press, 2018. http://dx.doi.org/10.1093/acrefore/9780190228620.013.611.

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The atmospheric circulation in the mid-latitudes of both hemispheres is usually dominated by westerly winds and by planetary-scale and shorter-scale synoptic waves, moving mostly from west to east. A remarkable and frequent exception to this “usual” behavior is atmospheric blocking. Blocking occurs when the usual zonal flow is hindered by the establishment of a large-amplitude, quasi-stationary, high-pressure meridional circulation structure which “blocks” the flow of the westerlies and the progression of the atmospheric waves and disturbances embedded in them. Such blocking structures can hav
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Book chapters on the topic "Amplitude-frequency characteristic"

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Yuan, Xin’an, Wei Li, Jianming Zhao, Xiaokang Yin, Xiao Li, and Jianchao Zhao. "Novel Phase Reversal Feature for Inspection of Cracks Using Multi-frequency Alternating Current Field Measurement Technique." In Recent Development of Alternating Current Field Measurement Combine with New Technology. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4224-0_5.

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AbstractAluminum and its alloys have been widely used in aerospace and other industrial fields. Aluminum and its alloy structures are prone to surface and subsurface cracks when they are used in harsh environments. In this paper, a novel phase reversal feature is found to classify and evaluate cracks using the multi-frequency alternating current field measurement (ACFM) technique. The theoretical model of the phase reversal feature is developed. The distorted electromagnetic field and response signals of surface and subsurface cracks are analyzed by the finite element method. The multi-frequen
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Sireesha, Ghanta Naga, and Prishati Raychowdhury. "Dynamic Characterization of Indian Pond Ash Through Cyclic Simple Shear Tests." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_43.

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AbstractIndia depends heavily on coal-based thermal power plants for its energy requirements, with as much as 75% of all installed power production capacity sourced from coal-based plants. Although the country is gradually moving towards non-conventional and renewable energy sources, still the dependency on coal-based energy is significant to date. Some recent studies have indicated that by 2030, the country will be in need of more than 1340 MT coal for power generation annually. The average ash production is 33% of coal consumed, which in turn implies that nearly 437 MT of annual ash producti
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Wang, Shengjun, Lianghua Xu, Wei Xiao, and Guoqing Liu. "Comparative Analysis of Vibration Characteristics Testing for Different Pumped Storage Power Station Plants." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4355-1_43.

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AbstractThe excitation force of the plant structural vibration of pumped storage power station mainly comes from hydraulic excitation, which is obviously related to the cascade combination formed by the number of runner blades and the number of movable guide vanes of the unit. The main frequency of the excitation force is closely related to the minimum pitch diameter number of the unit. The analysis of the vibration test data of the typical pumped storage power station plants showed that the structural vibration spectrum caused by the cascade combination unit with the minimum pitch diameter nu
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Deuschl, G., J. Timmer, H. Genger, C. Gantert, C. H. Lücking, and J. Honerkamp. "Frequency, Amplitude, and Waveform Characteristics of Physiologic and Pathologic Tremors." In Instrumental Methods and Scoring in Extrapyramidal Disorders. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-78914-4_9.

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Hu, Cong, Junhao Niu, and Haitao Su. "Automatic Testing Systems for Filter Amplitude-Frequency Characteristics Based on LabVIEW." In Advances in Computer Science, Intelligent System and Environment. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23753-9_115.

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Chernyshov, K. V., A. V. Pozdeev, V. V. Novikov, A. M. Kovalev, and S. A. Shiryaev. "Methodology for Constructing Regulatory Boundaries for the Amplitude-Frequency Characteristics of Vehicles." In Proceedings of the 8th International Conference on Industrial Engineering. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14125-6_32.

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Kohl, O. "Identification of Parameters of Stiffness and Damping Based on the Amplitude Frequency Characteristics." In The Latest Methods of Construction Design. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22762-7_63.

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Feng, Wenzong, Qing Zhang, Zhuoxiang Chen, Jianqun Zhang, and Haoyu Wang. "Dynamical Simulation Analysis of Faulty Gearbox in Quay Crane Under Dynamic Load." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_15.

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AbstractDynamics simulations with faults can elucidate fault vibration characteristics, yet the vibrational properties of the quay crane lifting gearboxes under dynamic load excitation remain unclear. Based on multi-body dynamics theory, a multi-body dynamical model of the quay crane gearbox is established, simulating dynamic load excitation caused by cables and containers during the operation of a quay crane. The vibration responses under various working conditions and load types of different gear states are analyzed, and the corresponding fault frequency features are extracted by envelope sp
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Sousa-Lima, Renata S., Juan Carlos Azofeifa-Solano, Vera M. F. da Silva, et al. "Sirenian Sounds." In Marine Mammal Acoustics in a Noisy Ocean. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-77022-7_7.

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Abstract Extant sirenians are the only aquatic herbivorous mammals and comprise four recognized species: the dugong, the Amazonian manatee, the West Indian manatee, and the African manatee. They inhabit coastal shallow waters in tropical and subtropical areas. All sirenian species produce sounds, many of which are audible to humans. These sounds range from tonal and narrowband to pulsed and broadband. Some of these vocalizations can be frequency-modulated and amplitude-modulated, ranging from 0.5 to at least 22 kHz in frequency and from &lt;0.02 to ~1 s in duration. The variation in sound char
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Junfeng, Chen, and Zhu Jun. "Study on the Amplitude Characteristics of Pitch and Heave Motions for a Ship Based on Frequency Scattering." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19706-2_21.

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Conference papers on the topic "Amplitude-frequency characteristic"

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Semenov, E. A., V. N. Posadskiy, V. S. Tyazhlov, Yu a. Kuzmin, and A. G. Kovalchuk. "Super Broadband Frequency Converter with Controlled Amplitude-Frequency Characteristic." In 2006 International Conference on Actual Problems of Electron Devices Engineering. IEEE, 2006. http://dx.doi.org/10.1109/apede.2006.307391.

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Semenov, E., V. Posadskiy, V. Tyazhlov, Yu Kuzmin, and A. Kovalchuk. "Super Broadband Frequency Converter with Controlled Amplitude-Frequency Characteristic." In 2006 16th International Crimean Microwave and Telecommunication Technology. IEEE, 2006. http://dx.doi.org/10.1109/crmico.2006.256320.

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Lee, Jie, Zhixiang Lin, Weizun Zheng, Zefeng Wang, and Jing Liu. "A Remote Amplitude Frequency Characteristic Testing Device." In 2017 International Conference on Information, Communication and Engineering (ICICE). IEEE, 2017. http://dx.doi.org/10.1109/icice.2017.8479209.

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Han, Shangyan, Yue Wu, Xiangli Zeng, et al. "Analysis of the Amplitude-Frequency characteristic of helical feeder." In 2020 7th International Conference on Information Science and Control Engineering (ICISCE). IEEE, 2020. http://dx.doi.org/10.1109/icisce50968.2020.00333.

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Han, Mingming, Bo Chen, Zhaoliang Gu, and Jihao Wang. "Amplitude frequency characteristic of TEV in substation with RCD." In 2020 5th Asia Conference on Power and Electrical Engineering (ACPEE). IEEE, 2020. http://dx.doi.org/10.1109/acpee48638.2020.9136213.

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Klaerner, Matthias, Mario Wuehrl, Lothar Kroll, and Steffen Marburg. "Characteristic amplitude-frequency functions of the radiated sound power." In 173rd Meeting of Acoustical Society of America and 8th Forum Acusticum. Acoustical Society of America, 2017. http://dx.doi.org/10.1121/2.0000549.

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Ke, Liu, Tian shulin, and Xiao Yindong. "A Method Of Amplitude-Frequency Characteristic Compensation About DDS Signal Source." In 2007 8th International Conference on Electronic Measurement and Instruments. IEEE, 2007. http://dx.doi.org/10.1109/icemi.2007.4351264.

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Chen, Bingyan, Juan Zhou, Rong Shi, and Mingyuan Xin. "Development and application on amplitude-frequency characteristic detection instrument of filter." In Instruments (ICEMI). IEEE, 2009. http://dx.doi.org/10.1109/icemi.2009.5274175.

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Bodrenkov, Evgeny A., Elena Y. Kochetkova, Alla A. Lebedeva, and Aleksandra N. Modulina. "Synthesis of Bandpass Filters with an Arithmetic Symmetric Amplitude-Frequency Characteristic." In 2021 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus). IEEE, 2021. http://dx.doi.org/10.1109/elconrus51938.2021.9396192.

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Titov, D. A., A. S. Tabakova, and I. V. Yunkin. "Amplitude-Frequency Characteristic of the Device for Measuring Estimates of the Characteristic Function of Signal." In 2021 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2021. http://dx.doi.org/10.1109/dynamics52735.2021.9653698.

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Reports on the topic "Amplitude-frequency characteristic"

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Witte, James. PR-015-17608-R01 Assess and Identify Methods to Reduce Ultrasonic Noise Effects on Ultrasonic Meters. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011603.

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Ultrasonic noise generated by aerodynamic noise attenuating control valves has been known to have an impact on ultrasonic flow meter performance when the noise characteristic is within the frequency range of the ultrasonic transducers and of great enough amplitude to interfere with ultrasonic signal detection by the flow meter electronics. The intent of this project was to demonstrate the effects of control-valve-generated ultrasonic noise on an ultrasonic flow meter. Flow meter performance characteristics observed when exposed to ultrasonic noise were to be identified, and different methods f
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Rahman, Shahedur, Rodrigo Salgado, Monica Prezzi, and Peter J. Becker. Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317134.

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Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were characterized based on the particle sizes and morphology parameters using digital image analysis technique. Small-scale laboratory compaction tests were carried out with variable frequency and amplitude of vibrations using vibratory hammer and vibrato
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