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Добірка наукової літератури з теми "Amplitude-frequency characteristic"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 22 червня 2025

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Статті в журналах з теми "Amplitude-frequency characteristic"

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 factors. Variations in the parameters of the gas generator lead to variations in its amplitude-frequency and phase-frequency characteristics. Mathematical models for variations in the frequency characteristics of the gas generator are built and it is shown that their frequency range should be limited by the bandwidth of the gas generator. The upper limit of the bandwidth of the gas generator is determined by the root of the biquadratic algebraic equation. For the typical parameters of the gas generator using a hydroreactive sample based on sodium aluminate, graphical dependences of variations of its amplitude-frequency and phase-frequency characteristics are constructed depending on variations of the transmission coefficient, time constants, and frequency. These dependencies are used to determine the parameters of the normal distribution law of variations in the frequency characteristics of the gas generator. In accordance with Lyapunov's rule, a normative law for the distribution of variations in the frequency characteristics of the gas generator is adopted. Due to the symmetry of the distribution of variations in the amplitude-frequency and phase-frequency characteristics of the gas generator, their mathematical expectations are equal to zero. Obtaining estimates of the amplitude and phase reliability of the gas generator is carried out using the Laplace function. The argument of this function is the permissible values of the frequency characteristics of the gas generator and their root mean square deviations. It is shown that with probabilities of 0,9973 and 0,9812, the amplitude-frequency and phase-frequency characteristics of the gas generator will not differ more than when it is turned on. Keywords: gas generator, reliability, frequency characteristics.

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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 different stratifications agree with those of the theoretical model, while there are some deviations for ISWs with large amplitudes. Neither the two-layer model nor the continuously stratified model can effectively describe the variation in the characteristic frequency at different depths with amplitude. For a single small-amplitude ISW, the characteristic frequency first increases and then decreases with increasing depth. The characteristic frequency is largest at the depth of the maximum buoyancy frequency. For an ISW with a relatively large amplitude, there is likely to be a local minimum of the characteristic frequency near the depth where the maximum buoyancy frequency lies. In different stratifications, the sech2 function of KdV theory can describe the waveforms of ISWs at different depths well.

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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 and draw conclusions about how the characteristics depend on the change in parameters and why the graph lines of the graphs are exactly the way they are.

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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 table. Digital signal is finally outputted by high-speed analog-to-digital conversion chip DAC900. Then, by controlling the 6-channel relay switch to make the magnification in the amplifying circuit,which can be adjusted step-by-step from-30dB to 20dB. Through outputting sine wave whose amplitude is fixed, but frequency is variable to the network under test, amplitude-frequency characteristic test module measures the relation betthe authoren the amplitude change of the output signal and the signal frequency to obtain the amplitude-frequency characteristics of the network under test..

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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 by 3 times with eight connected filters of the same type. Bandpass filters and notch Butterworth filters are considered. Behavior of the AFC for serial connection is described. Key words: amplitude frequency characteristic, phase frequency characteristic, Industry 4.0-6.0, digital filter, bandpass filter, notch filter, quality factor characteristics, frequency dependent component, notch filter based on bandpass filer, serial connection.

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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 forced oscillations of a linear linear fractional oscillator showed that fractional orders can be considered as control parameters of the oscillatory process in a dissipative medium. Key words: quality factor, amplitude-frequency characteristic, phase-frequency characteristic, fractional derivatives, memory.

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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 of this fixed frequency is justified. This dependence includes the value of the amplitude-frequency characteristic of the gas generator of the storage and supply of hydrogen at a fixed frequency, the static parameter of such a gas generator – its transmission coefficient, and the value of the fixed frequency. In the second stage, the choice of this fixed frequency is justified. This choice is made provided that the minimum error in determining the time constant of the gas generator. To determine the static parameter of the gas generator and the value of its amplitude-frequency characteristic at a fixed frequency, an array of data is used, which is formed by measuring the values of the transient function of the gas generator through equal moments of time. These time intervals are chosen according to the Kotelnikov-Nyquist-Shannon theorem. The amplitude-frequency characteristic of the gas generator of the hydrogen storage and supply system is determined numerically. According to the research results, an iterative procedure for determining the time constant of the gas generator of the hydrogen storage and supply system is given. Recommendations for using this procedure are given. The choice of the time constant of the gas generator of the hydrogen storage and supply system is made using the tolerance criterion.

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Liu, Hai Jiang, and Hong Yan Wang. "Development of the Amplitude-Frequency Characteristic Tester Based on SCM Control." Advanced Materials Research 706-708 (June 2013): 776–80. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.776.

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In this paper, the development of the amplitude-frequency characteristic tester based on SCM control has been introduced. The digital frequency synthesizer has been adopted to generate the automatic sweep frequency sine signals so as to provide the reliable sources for the frequency characteristic tester. The amplitude and the frequency characteristics of the active network and the passive network can be obtained through changing the output signals of circuit measuring network by digital analogy as well as the operation program of the microcontroller under the input signals with different frequencies. In this paper, the working principles of tester, the software and hardware design for the frequency synthesizer signals, the hardware and software design of the data collection channels and the applications of LCD technology have been specially discussed.

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Більше джерел

Дисертації з теми "Amplitude-frequency characteristic"

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 viscosity and acoustic velocity coefficients on a various flow as the final result.

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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-amplitude characteristics for the selected range of frequencies and flow the impedance characteristic of the compressor system is determined. We are looking for problematic frequencies in this characteristic that cause flow instabilities in the compressor system.

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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 used. Several measures of concentration/complexity have been proposed in the literature. However, those measures by being derived with certain theoretical assumptions about TFDs are generally not suitable for the TFD selection problem encountered in practical applications. The non-existence of practically-valuable measures for TFDs' resolution comparison, and hence the non-existence of methodologies for the signal optimal TFD selection, has significantly limited the use of time-frequency tools in practice. In this thesis, by extending and complementing the concept of spectral resolution to the case of nonstationary signals, and by redefining the set of TFDs' properties desirable for practical applications, we define an objective measure to quantify the quality of TFDs. This local measure of TFDs' resolution performance combines all important signal time-varying parameters, along with TFDs' characteristics that influence their resolution. Methodologies for automatically selecting a TFD which best suits a given signal, including real-life signals, are also developed. The optimisation of the resolution performances of TFDs, by modifying their kernel filter parameters to enhance the TFDs' resolution capabilities, is an important prerequisite in satisfying any additional application-specific requirements by the TFDs. The resolution performance measure and the accompanying TFDs' comparison criteria allow to improve procedures for designing high-resolution quadratic TFDs for practical time-frequency analysis. The separable kernel TFDs, designed in this way, are shown to best resolve closely-spaced components for various classes of synthetic and real-life signals that we have analysed.

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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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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 attenuation. Noise examples are presented in a 3-D format of time, frequency, and amplitude. Graphs are presented that allow estimation of the percentage of HF non-broadcast signals lost as a function of noise and interference levels. Limitations of HF search receivers using analog-to-digital converters as the receiver front-end are discussed. Derived bounds on AD converter performance show that today's digital technology does not provide enough dynamic range, sensitivity, or sampling rate. Alternative dynamic range extension methods are examined. A new method of dynamic range extension by removing the strongest signals present is presented. Greater receiver sensitivity results from changing the HF signal environment seen by the AD converter. The new method uses a phase-tracking network and signal reconstruction techniques.

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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 геологічних порушень у функціях модуляційних параметрів сигналу, який отримано в результаті акустичного зондування вуглепородного масиву. Закономірності, отримані в результаті досліджень використані для розробки рекомендацій щодо тектонічної будови вугільних пластів для шахт «Дніпровська», «Краснолиманська» та «Степова».<br>В диссертации решена актуальная научно-техническая задача повышения эффективности прогноза малоамплитудных геологических нарушений угольных пластов методом неразрушающего контроля до 95%. Организованы и проведены комплексные шахтные, лабораторные и аналитические исследования распространения акустических колебаний в сложноструктурном породном массиве с геологическими нарушениями при использовании различных способов генерации зондирующего акустического сигнала. Впервые доказан факт информационной амплитудно-фазовой модуляции низкочастотных огибающих спектральной плотности мощности несущих частот зондирующего сигнала, прошедшего через исследуемый породный массив. Предложена и обоснована математическая модель распространения акустического волнового пакета в диспергирующей породной среде, отличающаяся от известных тем, что основана она на информационной амплитудно-фазовой модуляции несущих частот зондирующего сигнала. Предложена методика обработки сигнала волнового пакета зондирующего сигнала, прошедшего сквозь структурно-неоднородный породный массив, отличающаяся от известных тем, что в ее основу заложена фазовая демодуляция функции спектральной плотности мощности с применением метода низкочастотного эквивалента. Методика позволяет определить геометрические параметры неоднородностей при прохождении выработок в зонах геологических нарушений. Установлено, что исследование низкочастотной огибающей спектральной плотности мощности несущих частот и последующая ее фазовая демодуляция в среде Matlab позволяет получить фазовые характеристики огибающей, которые несут в себе информационную составляющую, отвечающую за структуру угольного пласта. Доказано, что в случае наличия нарушения график фазовой характеристики имеет один глобальный экстремум, который существенно отличается от остальных – локальных – своей первой производной. Причем, при фазовой демодуляции максимальная амплитуда несущей частоты иногда бывает менее информативна, чем боковые, поэтому в программе оценки нижних частот расчет функции полной фазы низкочастотных спектральных составляющих, осуществляется по четырем несущим с максимальной амплитудой, а среди них выбирается одна – с наиболее резким изменением сигнала. На основе их анализа сделан вывод о том, что на изгибе функции отражается излом характеристики. Доказано, что точка глобального экстремума фазовой характеристики низкочастотной огибающей спектральной плотности мощности несущих частот, вычисляемая методом низкочастотного эквивалента, определяет местонахождение разрывного геологического нарушения в угольном пласте с надежностью не менее 0.95, что позволяет существенно повысить надежность прогноза геоакустическим методом. Описанная точка экстремума возникает в определенное время распространения искусственного сигнала. Имея данные о местонахождении источника сигнала в момент времени его прохождения сквозь массив, местонахождении приемника и скорость распространения акустической волны в волноводе можно определить координаты соответствующей точки разрывного нарушения. Основываясь на анализе данного экстремума установлено, что координаты разрывного нарушения на прямой от источника искусственно генерируемого сигнала до приемника в плоскости волновода определяются произведением средней скорости распространения акустического колебания в угольном пласте и временем, соответствующем возникновению глобального экстремума фазовой характеристики низкочастотной огибающей спектральной плотности мощности несущих частот, что позволяет определить геометрические параметры разрывного нарушения в угольном пласте. Разработан эффективный способ прогноза скрытых дизьюнктивов в угольных пластах методом неразрушающего контроля. В его основу положен анализ особенностей проявления разрывных геологических нарушений в функциях модуляционных параметров сигнала, который получен в результате акустического зондирования углепородного массива. Закономерности, полученные в результате исследований использованы для разработки рекомендаций относительно тектонического строения угольных пластов для шахт «Краснолиманская» ГП «УК «Краснолиманская», «Днепровская» и «Степная» ПАО «ДТЭК Павлоградуголль».<br>In the thesis, the actual scientific and technical problem of raising efficiency of low-amplitude geological disturbances forecast in coal layers by the method of nondestructive testing up to 95 % is solved. The comprehensive mine, laboratory and analytical research concerning propagation of acoustic oscillations in the complex structured rock massif with geological faults by using different methods of probing acoustic signal generation are organized and conducted. The mathematical model of spreading acoustic wave packet in the dispersion medium based on the information and amplitude-phase modulation of carrying frequencies of the probing signal is proposed and justified. An effective method of the forecasting hidden disjunctives in coal layers by the method of non-destructive testing is developed. The method is based on the analysis of characteristic emergencies of geological faults in the functions of a signal modulation parameters obtained by acoustic probing of coal-rock massif. The regularities obtained from the research results are used to develop recommendations regarding the tectonic structure of coal layers for mines "Dniprovska", "Krasnolymanska" and "Stepova".

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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 імпульсному режимі збудження, в основі якої лежить визначення запропонованих інформативних параметрів цих сигналів через їх амплітудну та фазову характеристики за допомогою застосування перетворення Гільберта. Запропоновано використання експоненційної апроксимації для амплітудної характеристики та лінійного тренду для фазової характеристики сигналу вихрострумового перетворювача для підвищення точності визначення інформативних параметрів цього сигналу. Проведено аналіз похибок визначення частоти власних коливань та коефіцієнта загасання сигналу вихрострумового перетворювача, який дозволив визначити умови отримання мінімальної похибки визначення цих інформативних параметрів сигналу та визначити оптимальний час аналізу, що суттєво впливає на результати контролю в умовах впливу завад і шумів.

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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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Книги з теми "Amplitude-frequency characteristic"

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 have lifetimes varying from a few days to several weeks in the most extreme cases. Their presence can strongly affect the weather of large portions of the mid-latitudes, leading to the establishment of anomalous meteorological conditions. These can take the form of strong precipitation episodes or persistent anticyclonic regimes, leading in turn to floods, extreme cold spells, heat waves, or short-lived droughts. Even air quality can be strongly influenced by the establishment of atmospheric blocking, with episodes of high concentrations of low-level ozone in summer and of particulate matter and other air pollutants in winter, particularly in highly populated urban areas.Atmospheric blocking has the tendency to occur more often in winter and in certain longitudinal quadrants, notably the Euro-Atlantic and the Pacific sectors of the Northern Hemisphere. In the Southern Hemisphere, blocking episodes are generally less frequent, and the longitudinal localization is less pronounced than in the Northern Hemisphere.Blocking has aroused the interest of atmospheric scientists since the middle of the last century, with the pioneering observational works of Berggren, Bolin, Rossby, and Rex, and has become the subject of innumerable observational and theoretical studies. The purpose of such studies was originally to find a commonly accepted structural and phenomenological definition of atmospheric blocking. The investigations went on to study blocking climatology in terms of the geographical distribution of its frequency of occurrence and the associated seasonal and inter-annual variability. Well into the second half of the 20th century, a large number of theoretical dynamic works on blocking formation and maintenance started appearing in the literature. Such theoretical studies explored a wide range of possible dynamic mechanisms, including large-amplitude planetary-scale wave dynamics, including Rossby wave breaking, multiple equilibria circulation regimes, large-scale forcing of anticyclones by synoptic-scale eddies, finite-amplitude non-linear instability theory, and influence of sea surface temperature anomalies, to name but a few. However, to date no unique theoretical model of atmospheric blocking has been formulated that can account for all of its observational characteristics.When numerical, global short- and medium-range weather predictions started being produced operationally, and with the establishment, in the late 1970s and early 1980s, of the European Centre for Medium-Range Weather Forecasts, it quickly became of relevance to assess the capability of numerical models to predict blocking with the correct space-time characteristics (e.g., location, time of onset, life span, and decay). Early studies showed that models had difficulties in correctly representing blocking as well as in connection with their large systematic (mean) errors.Despite enormous improvements in the ability of numerical models to represent atmospheric dynamics, blocking remains a challenge for global weather prediction and climate simulation models. Such modeling deficiencies have negative consequences not only for our ability to represent the observed climate but also for the possibility of producing high-quality seasonal-to-decadal predictions. For such predictions, representing the correct space-time statistics of blocking occurrence is, especially for certain geographical areas, extremely important.

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Частини книг з теми "Amplitude-frequency characteristic"

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-frequency ACFM testing system is set up. The experiments are carried out to test surface and subsurface cracks. The results show that the response signals of the surface and subsurface cracks have distinct characteristic due to the phase reversal feature using the multi-frequency ACFM technique. The surface and subsurface cracks can be classified by the amplitude reversal phenomenon of the Bz signal caused by the novel phase reversal feature. The buried depth of the subsurface crack can be evaluated accurately by the reversal frequency component.

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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 production. To reduce this disposal problem and the construction cost of engineering structures, pond ash is nowadays encouraged to be widely used as a geotechnical fill material in various infrastructure, in particular highway construction. However, there is significant research gap regarding understanding the behaviour of pond ash, particularly under repetitive cyclic loading, vehicle-induced vibratory loading, and earthquake-induced high-intensity and high-frequency transient loadings. The present study focuses on experimentally investigating the cyclic behaviour of pond ash samples under various confining pressures and strain levels and relative densities. The pond ash sample was collected from the nearby Parichha Thermal Power Plant located in Jhansi town in Uttar Pradesh, India. A series of element-level strain-controlled cyclic simple shear tests have been conducted for this purpose, apart from physical characteristic tests, compaction test, permeability tests, and direct shear tests on pond ash. The dynamic shear modulus was observed to be highly sensitive to the change in confining pressure, showing an increase of about 34% when the confining pressure was increased from 100 kPa to 200 kPa. For subjected to higher strain amplitude, the ash material showed softer behaviour with faster degradation in strength and stiffness and increased vulnerability for liquefaction related failure.

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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 number equaled 1 or 2, generally manifests as a single main frequency and a large vibration amplitude of the plant. While, the structural vibration spectrum caused by the cascade combination unit with the minimum pitch diameter number equaled 4 is relatively dispersed, and the vibration amplitude of the plant is relatively low. The above research indicates that the vibration amplitude of the plant has a significant decrease by using the cascade combination unit with the minimum pitch diameter number equaled 4, which is very beneficial for the vibration reduction of the plant.

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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 spectrum. Simulations indicate that local gear faults enlarge the amplitude of gearbox vibrations, inducing the phenomenon of gear mesh frequency and its harmonics modulated by gear fault frequency. Based on these studies, a testbed for the quay crane gearbox is constructed. The experiment verifies the accuracy of the dynamic model and reveals that the simulation signal of load-as-dynamic-load is more consistent with reality than static load. The results provide a basis for fault diagnosis of quay crane lifting gearboxes under dynamic load, and can offer simulation data support for intelligent diagnosis models lacking fault samples.

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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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Liu, Wenwu, Hongsheng Zhang, and Nianli Lu. "Research on Equivalent Wind Load Spectrum Acquisition and Remaining Fatigue Strength Method of Double Active Arm Type Holding Pole." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_35.

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AbstractIn order to study the wind load fatigue residual strength in in-service holding poles for preventing disasters, and improving load-bearing capacity reliability. Firstly, using the Davenport wind speed spectrum to simulate the wind speed, it will be the input load of the finite element dynamics model of the 2 × 40 kN double active arm type holding pole (DAATHP). The stress time history curve at the welding section of the main chord at the bottom of the tower shaft is obtained at the working condition with the wind angle of 0°, 45°, 90°, and 135°. The rain flow counting method derives the statistical characteristics of the mean, amplitude, and frequency of stress at four wind angles. Secondly, the frequency of wind load under four wind angles is extended, and the synthesized fatigue load spectrum is used as the equivalent wind load spectrum. Finally, the Paris-Eadogan equation is used to derive the calculation formula of fatigue residual strength of the main chord at the bottom of the tower shaft, and the functional function of the main chord is established and then the failure probability formula is derived by combining the equivalent wind load spectrum. It is found that, compared with the ANSYS calculation results, the error of the predicted stress spectrum of the proposed method is minor, only 7.95%. It is verified that the proposed method can efficiently obtain the equivalent load spectrum of the DAATHP. The results indicate that it is feasible and practical to apply the proposed method to calculate the remaining fatigue life of the DAATHP.

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Тези доповідей конференцій з теми "Amplitude-frequency characteristic"

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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Звіти організацій з теми "Amplitude-frequency characteristic"

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 for potential mitigation of the problem were to be experimentally evaluated. Control valve noise characteristics have been previously evaluated by ultrasonic meter manufacturers and control valve manufacturers. However, the specific ultrasonic frequency spectrum characteristics, which are unique to each control valve noise attenuating trim, are proprietary information held by the manufacturers.

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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 vibratory table. The results show an increase in density with the increase in amplitude and frequency of vibration. However, the increase in density with the increase in amplitude of vibration is more pronounced for the coarse aggregates than for the sands. A comparison of the maximum dry densities of different test materials shows that the dry densities obtained after compaction using the vibratory hammer are greater than those obtained after compaction using the vibratory table when both tools were used at the highest amplitude and frequency of vibration available. Large-scale vibratory roller compaction tests were performed in the field for No. 30 backfill soil to observe the effect of vibration frequency and number of passes on the compaction density. Accelerometer sensors were attached to the roller drum (Caterpillar, model CS56B) to measure the frequency of vibration for the two different vibration settings available to the roller. For this roller and soil tested, the results show that the higher vibration setting is more effective. Direct shear tests and direct interface shear tests were performed to study the impact of particle characteristics of the coarse-grained backfill materials on interface shear resistance. The more angular the particles, the greater the shear resistance measured in the direct shear tests. A unique relationship was found between the normalized surface roughness and the ratio of critical-state interface friction angle between sand-gravel mixture with steel to the internal critical-state friction angle of the sand-gravel mixture.

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