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Journal articles on the topic 'Amplitude-frequency characteristic'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

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 freq

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12

Zhou, M., and D. Kuznetsov. "The Energy Circuit of the Exhaust Gas Heat Recovery Circuit of a 25 kW Diesel Generator." Bulletin of Science and Practice 10, no. 6 (2024): 317–29. http://dx.doi.org/10.33619/2414-2948/103/35.

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The purpose of the work is to describe the installation using differential equations and obtain approximate values before the experiment. 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 obtai

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13

Han, Wang, and S. Maltsev. "Energy Circuit of a Thermal Circuit with a Direct-acting Regulator with a Capacity of 1 MW in Pulsating Mode." Bulletin of Science and Practice 10, no. 6 (2024): 372–83. http://dx.doi.org/10.33619/2414-2948/103/40.

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The purpose of the work is to describe the installation using differential equations and obtain approximate values before the experiment. 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 obtai

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14

Li, Li Ping. "Experiment Analysis about Mechanical Properties of Rubber Bushing for Suspension Telescopic Shock Absorber." Applied Mechanics and Materials 670-671 (October 2014): 1008–11. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.1008.

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The experiments of static and dynamic characteristics of rubber bushing for rear suspension telescopic shock absorber were carried out at four directions such as axial, radial, torsion and yaw, by MTS831 and SAGINOMIYA test system. The tests prove that: rubber bushing has great damping, and rubber bushing has obvious nonlinear characteristic; the dynamic stiffness under low frequency and large amplitude excitation is smaller, while the dynamic stiffness under high frequency and small amplitude excitation is greater; at the same amplitude, the dynamic stiffness increases with the increasing exc

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15

Parovik, Roman. "Frequency characteristics of the fractional oscillator Van der Pol." E3S Web of Conferences 127 (2019): 02010. http://dx.doi.org/10.1051/e3sconf/201912702010.

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Into this paper, the amplitude-frequency and phase-frequency characteristics of the Van der Polar fractional oscillator are studied in order to establish their relationship with the orders of fractional derivatives included in the model equation. Using the harmonic balance method, analytical formulas were obtained for the amplitude-frequency, phase-frequency characteristics, as well as the quality factor – the energy characteristic of the oscillatory system. It was shown that the quality factor depends on the orders of fractional derivatives, and change in their values can lead to both an incr

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16

Eugene, Kononykhin. "DEVELOPMENT OF PROCEDURES FOR DETERMINING THE PARAMETERS OF AN AIRCRAFT SERVO ACTUATOR." Eastern-European Journal of Enterprise Technologies 1, no. 9 (97) (2019): 11–18. https://doi.org/10.15587/1729-4061.2019.154837.

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Main trends in the use of electro-hydraulic actuators and requirements to parameters were discussed. Necessity of using automatic methods for testing an electro-hydraulic actuator together with the standard hardware of the electronic control unit was substantiated. The procedures for testing the control loop of an electro-hydraulic actuator set forth in this study make it possible to eliminate effects of mutual influence of dynamic and static characteristics of the actuator and hardware of the electronic control unit. Procedures for automatic identification of the actuator model and procedures

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17

Hao, Shijun, Jialiang Xie, Yanbin Liang, Kaiwei Wu, and Bing Yang. "Analysis of the Response Characteristics of Ultra-Wideband Radio Fuze to Interference Signals." Journal of Physics: Conference Series 2891, no. 12 (2024): 122013. https://doi.org/10.1088/1742-6596/2891/12/122013.

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Abstract The response characteristics of the fuze to the interference signal with reasonable characteristic parameters are similar to the real echo signal, which may lead to the confusion of signal processing and recognition system. To solve this problem, this paper analyzes the influence of characteristic parameters of interference signal on the response characteristics of fuze in detail from two perspectives of time domain and frequency domain, Based on the analysis of receiver principle, the amplitude-frequency response model of sampling integral differential circuit is established, and the

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18

Ma, Liang, Jun Wang, and Guichang Zhang. "The Dynamic Characteristic of a Faulted Rotor System with Multi-Objective Optimization Designed SFD." Applied Sciences 9, no. 17 (2019): 3628. http://dx.doi.org/10.3390/app9173628.

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As an important part of the turbomachinery, the rotor–bearing system has been upgraded to provide a high rotating speed in order to meet the demand of high power production. With increasing demand for stability, the squeeze film damper (SFD) has been widely used in industrial machinery because it can reduce the vibration amplitude and suppress the external force. Usually, it shows inadaptability under the different working conditions where the SFD parameters didn’t change appropriately. Therefore, the reasonable choice of operational parameters of SFD is the key solution that can provide visco

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19

Xu, Qian, Zhong-Qi Wang, Wen-Gong Han, and Cheng-Long Yu. "Seismic wavefield model excited by a finite long cylindrical charge." GEOPHYSICS 87, no. 3 (2022): P15—P28. http://dx.doi.org/10.1190/geo2020-0260.1.

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The amplitude-frequency characteristic of a seismic wave excited by explosion sources directly affects the accuracy of seismic exploration. To reveal the effect law related to a cylindrical charge, this research proposes a seismic wavefield model excited by a long cylindrical charge. According to the characteristics of the blasting cavity generated by a finite-length cylindrical charge, the seismic wavefield characteristics of a cylindrical charge excitation are obtained by superposing the seismic wavefield excited by a series of spherical charges. Numerical simulation results show that the ca

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20

Xu, Jinli, Jiwei Zhu, and Feifan Xia. "Modeling and Analysis of Amplitude-Frequency Characteristics of Torsional Vibration for Automotive Powertrain." Shock and Vibration 2020 (August 29, 2020): 1–17. http://dx.doi.org/10.1155/2020/6403413.

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In the present paper, the amplitude-frequency characteristics of torsional vibration are discussed theoretically and experimentally for automotive powertrain. A bending-torsional-lateral-rocking coupled dynamic model with time-dependent mesh stiffness, backlash, transmission error etc. is proposed by the lumped-mass method to analysis the amplitude-frequency characteristic of torsional vibration for practical purposes, and equations of motive are derived. The Runge–Kutta method is employed to conduct a sweep frequency response analysis numerically. Furthermore, a torsional experiment is perfor

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21

Liu and Zhong. "Research on an Electromagnetic Interference Test Method Based on Fast Fourier Transform and Dot Frequency Scanning for New Energy Vehicles under Dynamic Conditions." Symmetry 11, no. 9 (2019): 1092. http://dx.doi.org/10.3390/sym11091092.

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In recent years, electromagnetic interference (EMI) of new energy vehicles, including difference mode symmetric interference and common mode asymmetry interference, has attracted the attention of many scholars. So far, EMI tests for new energy vehicles under steady conditions cannot reflect the actual EMI of the running vehicle. The results of EMI test methods based on fast Fourier transform (FFT) under dynamic conditions have worse frequency resolutions, and frequency/amplitude accuracy has low precision. Therefore, this paper proposes an EMI test method based on FFT and dot frequency scannin

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22

Zeng, Xiang Kun. "Experimental Analysis of Dynamic Characteristic for Automatic Tensioner." Advanced Materials Research 915-916 (April 2014): 49–52. http://dx.doi.org/10.4028/www.scientific.net/amr.915-916.49.

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Experimental method and parameters to investigate the dynamic performances of an automatic tensioner are discussed. Parameters to evaluate the dynamic performances of a tensioner include dynamic stiffness, loss angle and equivalent viscous coefficient. Dynamic stiffness and loss angle can be measured directly, and the equivalent viscous coefficient can be calculated by torque-angular displacement loop which identified with the parameters including dynamic stiffness, loss angle, pre-load torque, pre-load angular displacement, excitation amplitude and excitation frequency. In this paper, the inf

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23

Wei, Cuicui, Hongen Niu, and Liping Zeng. "Research on Nonlinear Vibration of Dual Mass Flywheel Considering Piecewise Linear Stiffness and Damping." Mathematical Problems in Engineering 2024 (February 7, 2024): 1–11. http://dx.doi.org/10.1155/2024/8683229.

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Nonlinear torsional vibration differential equation of the nested arc-shaped short spring dual mass flywheel (DMF) is established, considering the piecewise linear stiffness and damping of the spring. The first-order approximate analytical solution under sinusoidal excitation and the amplitude–frequency characteristic function are obtained by means of the average method which verified by the Runge–Kutta (R–K) method. The effects of the parameters of input excitation, inertia, and piecewise linear stiffness and damping of DMF on the resonant amplitude, resonant frequency band, and equivalent li

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24

Zhao, Yan Ping, Zi Long Zhao, and Guo Yun Lu. "Analysis of Steel Rope Shock Absorber Amplitude Frequency Characteristics under the Basic Excitation." Applied Mechanics and Materials 312 (February 2013): 287–91. http://dx.doi.org/10.4028/www.scientific.net/amm.312.287.

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In this paper, the differential equations of the steel rope shock absorber are established under the basic excitation, using the Fourier series expansion method and the Harmonic balance method, the corresponding frequency response equations are derived, then their numerical solutions is got, and the influence of the mass, damping, stiffness, and hysteretic force on the frequency response characteristic is analyzed under the basic excitation. It can be drawn by analyzing and comparing. Under the basic excitation, with the basic simplified mass increasing, the natural frequency will decrease, wh

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25

Abramov, Y., V. Kryvtsova, and A. Mikhailyuk. "ALGORITHM FOR DETERMINATION OF RELIABILITY INDICATOR OF GAS GENERATOR OF HYDROGEN STORAGE AND SUPPLY SYSTEM." Municipal economy of cities 4, no. 164 (2021): 153–57. http://dx.doi.org/10.33042/2522-1809-2021-4-164-153-157.

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An algorithm for determining one of the indicators of reliability of the main element of the hydrogen storage and supply system – a gas generator has been developed. Such an algorithm is an integral part of the general algorithm to ensure the required level of fire safety of hydrogen storage and supply systems. The algorithm involves the implementation of several stages. At the first stage, using the expression for the amplitude-frequency characteristic of the gas generator, the functional dependences for its time constants are obtained. These functional dependencies include the values of the

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26

Xu, Hui, Zeng Tian Yan, Yang Wang, and Song Wei Gao. "Transmission Design of the Ultrasonic Flow Measurement Based on the Correlation Method." Advanced Materials Research 503-504 (April 2012): 1441–44. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.1441.

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In design of ultrasonic flow measurement, the reproducibility of constant amplitude periodic signal will lead to a not unique time difference based on the correlation method. The aim of this paper is to design a set of amplitude modulation transmitting signal to solve the multiple values calculation of the time difference. The frequency characteristics of ultrasonic probe and the amplitude frequency characteristic of different duty cycle square wave are researched and tested. We cleverly combine the logic device FPGA with the property of the ultrasonic probe to achieve the amplitude modulation

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27

Li, Yajie, Zhiqiang Wu, Qixun Lan, Yujie Cai, Huafeng Xu, and Yongtao Sun. "The modulation of response caused by the fractional derivative in the Duffing system under super-harmonic resonance." Thermal Science 25, no. 3 Part B (2021): 2357–67. http://dx.doi.org/10.2298/tsci191201126l.

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The dynamic characteristics of the 3:1 super-harmonic resonance response of the Duffing oscillator with the fractional derivative are studied. Firstly, the approximate solution of the amplitude-frequency response of the system is obtained by using the periodic characteristic of the response. Secondly, a set of critical parameters for the qualitative change of amplitude-frequency response of the system is derived according to the singularity theory and the two types of the responses are obtained. Finally, the components of the 1X and 3X frequencies of the system?s time history are extracted by

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28

Madola, Vladimír, Vladimír Cviklovič, and Stanislav Paulovič. "Analysis of Ultrasound Signal on Reflection from a Sharp Corner Surface: Study of Selected Characteristics Deriving from Regression by Transfer Function." Processes 10, no. 12 (2022): 2644. http://dx.doi.org/10.3390/pr10122644.

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This article deals with the regression analysis of the ultrasonic signal amplitude when the character of the reflection surface has been changed from a planar case to a sharp corner case. The experiment was performed at a measurement distance within the interval from 100 mm to 215 mm. A nonlinear correlation between the amplitude of the ultrasound signal and the measured distance was demonstrated. By analyzing the frequency spectra, a poor nonlinear correlation between the maximum frequency component and the distance vector was found for the sharp corner case versus the planar case, which prov

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29

Chu, Hai Rong, Bo Liu, and Yue Zhang. "Three-Loop Autopilot Frequency Characteristic Measurement." Applied Mechanics and Materials 494-495 (February 2014): 1332–34. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1332.

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In order to measurement frequency characteristic of the missile three loop autopilot, three loop autopilot system model of the missile pitch channel was established. Then the autopilot system open-loop model was analyzed , and also open-loop frequency calculation formula was deduced. On the basis of the autopilot system model, half physical frequency characteristic measurement system was built, and the experimental data were processed by using correlation analysis method. Experimental results shows that when the time delay of measurement system was compensated, three loops autopilot actual cut

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30

Wan, Di Qing, Bo Lin He, Jin Cheng Wang, and Gen Cang Yang. "Strain Amplitude Dependence of Damping Capacity in High Damping Mg-Based Alloys Continuously Extending to Microplastic Strain." Advanced Materials Research 97-101 (March 2010): 937–40. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.937.

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An investigation on low frequency strain amplitude dependence damping characteristic of as-cast high damping Mg-based alloys continuously extending to microplastic strain was carried out. Two-stage damping behavior via strain amplitude was particularly reported. The first is the strain amplitude strongly dependent part due to breakaway loss and the second is the strain amplitude weakly dependent part due to microplastic deformation loss, which is also frequency dependent. The damping mechanism is discussed in detail.

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31

Yong, Yang, Shuai Zhang, and Yan Huai Qu. "HHT Based Analysis on Experiments of Rotor System with Rub-Impact." Advanced Engineering Forum 2-3 (December 2011): 111–16. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.111.

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Based on the demand of engineering, the motion characteristics and time-frequency properties of rotor system with rub-impact at fixed limiter are studied by experiment. Three typical cases at different rotating speeds are chosen from the experiment. On the basis of traditional amplitude spectrum and shaft center orbit methods, Hilbert-Huang transformation is applied to the fault signals analysis. Fault features are characterized completely and accurately by Hilbert spectrum. It is show that the vibration of the system is with typical characteristic of periodic motions and corresponding time-fr

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32

Modzelewski, Juliusz, and Mirosław Mikołajewski. "High-Frequency Power Amplitude Modulators with Class-E Tuned Amplifiers." Journal of Telecommunications and Information Technology, no. 4 (June 26, 2023): 79–86. http://dx.doi.org/10.26636/jtit.2008.4.903.

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A high-frequency power amplifier used in a drain amplitude modulator must have linear dependence of output HF voltage Vo versus its supply voltage VDD. This condition essential for obtaining low-level envelope distortions is met by a theoretical class-E amplifier with a linear shunt capacitance of the switch. In this paper the influence of non-linear output capacitance of the transistor in the class-E amplifier on its Vo(VDD) characteristic is analyzed using PSPICE simulations of the amplifiers operating at frequencies 0.5 MHz, 5 MHz and 7 MHz. These simulations have proven that distortions of

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FAN, Shengping, Jing LI, Linyong LI, Xiaopeng FAN, Hualiang LI, and Nansha GAO. "Theoretical model and experimental study on working characteristics of electromagnetic damper." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 41, no. 4 (2023): 688–96. http://dx.doi.org/10.1051/jnwpu/20234140688.

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An analysis model for electromagnetic damper is proposed in order to obtain the working characteristics of electromagnetic damper under different working conditions. Firstly, the inertia force and the electromagnetic force of electromagnetic damper are calculated, and the friction force is tested. Secondly, by combining the theoretical results and the test data, the working characteristic analysis model for electromagnetic damper is established. Finally, the damping characteristics and energy harvesting characteristics of the electromagnetic damper under multiple working conditions are discuss

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Власов, В. С., В. Г. Шавров та В. И. Щеглов. "Нелинейное расщепление линии магнитоупругого резонанса в сильно возбужденном феррите". Журнал технической физики 92, № 1 (2022): 62. http://dx.doi.org/10.21883/jtf.2022.01.51853.167-21.

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The nonlinear splitting of magnetoelastic resonance line in powerfully excited ferrite is investigated. It is shown that the amplitude of splited resonance has the same order of value that the amplitude of basis resonance and its frequency is determined by the upper boundary of nonlinear amplitude-frequency characteristic of magnetic system. It is found the threshold character of splitting additional resonance from general. It is determined the possibility of operation of splited elastic resonance frequency by changing of exited magnetic field value which has practical importance.

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Pavlina, Hristova, and Alexandrova Violeta. "AMPLITUDE AND FREQUENCY CHARACTERISTICS OF THE VOCALIZATIONS OF CANIDAE FAMILY, GENUS CANIS." Tradition and Modernity in Veterinary Medicine 8, no. 1 (2023): 65–70. https://doi.org/10.5281/zenodo.8174824.

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The present study aims to present and compare the sounds produced by the representatives of the family Canidae, in particular the genus Canis, in terms of their amplitude and frequency characteristics. The results show that the power generated by the vocal apparatus of wolves is the greatest, compared to that of the domestic dog and the jackal, in which they are the lowest, presented in dB. The reflected values for the frequency characteristic of the sound signals in these three representatives of the genus Canis are inversely related – highest in jackals, again average in dogs and lowes

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Chaari, Fakher, Walter Bartelmus, Radoslaw Zimroz, Tahar Fakhfakh, and Mohamed Haddar. "Gearbox Vibration Signal Amplitude and Frequency Modulation." Shock and Vibration 19, no. 4 (2012): 635–52. http://dx.doi.org/10.1155/2012/839420.

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Gearboxes usually run under fluctuating load conditions during service, however most of papers available in the literature describe models of gearboxes under stationary load conditions. Main task of published papers is fault modeling for their detection. Considering real situation from industry, the assumption of stationarity of load conditions cannot be longer kept. Vibration signals issued from monitoring in maintenance operations differ from mentioned models (due to load non-stationarity) and may be difficult to analyze which lead to erroneous diagnosis of the system. The objective of this

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Liu, Heng, Jiale Wu, and Yu Zhang. "Coupled Double Closed-Loop Control for an MEMS Resonant Accelerometer." Micromachines 13, no. 10 (2022): 1612. http://dx.doi.org/10.3390/mi13101612.

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There is mutual coupling between amplitude control and frequency tracking control in the closed-loop control of micromechanical resonant sensors, which restricts sensor performance. This paper introduces the principle of an in-plane vibration micromechanical resonant accelerometer with electrostatic stiffness. The characteristic parameters of the microaccelerometer were obtained through computer-aided dimension measurement and an open-loop frequency sweep test of the fabricated microstructure. An accurate numerical model was established based on the accelerometer’s dynamic principle and charac

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Vlasov V. S., Shavrov V. G., and Shcheglov V. I. "Nonlinear splitting of magnetoelastic resonance line in powerfully excited ferrite." Technical Physics 92, no. 1 (2022): 40. http://dx.doi.org/10.21883/tp.2022.01.52531.167-21.

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The nonlinear splitting of magnetoelastic resonance line in powerfully excited ferrite is investigated. It is shown that the amplitude of splited resonance has the same order of value that the amplitude of basis resonance and its frequency is determined by the upper boundary of nonlinear amplitude-frequency characteristic of magnetic system. It is found the threshold character of splitting additional resonance from general. It is determined the possibility of operation of splited elastic resonance frequency by changing of exited magnetic field value which has practical importance. Keywords: fe

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Wang, Jing, and Jianqiang Sun. "Two types of scale effects on the nonlinear forced vibration of axially moving nanobeams." International Journal of Modern Physics B 34, no. 10 (2020): 2050095. http://dx.doi.org/10.1142/s0217979220500952.

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Various non-classical continuum mechanics models appearing in previous studies cannot perfectly explain the mechanical properties of micro- and nanomaterials. Establishing a reasonable continuum mechanics model that comprehensively reflects the scale effect on material deformation is of great practical significance for objectively explaining the variation law of mechanical properties of micro- and nanomaterials under the combined action of different scale effects. Based on nonlocal strain gradient theory, a new scale-dependent model is proposed for axially moving nanobeams. In this study, an a

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Chen, Tao, Songbai Xue, Peizhuo Zhai, Bo Wang, and Weimin Long. "Study on Penetration Sensing Method Based on Pool Oscillation and Arc Voltage during Pulsed GMAW." Applied Sciences 10, no. 8 (2020): 2735. http://dx.doi.org/10.3390/app10082735.

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The internal relations among the oscillation characteristics of the weld pool, the voltage signal curve and the penetration status of the weld joint in pulsed gas metal arc welding were investigated by using high-speed camera and image analysis system to extract characteristics of weld pool oscillation. The results show that the amplitude of weld pool oscillation decreased with decreasing weld penetration. An abrupt change occurred in the frequency components and amplitude of weld pool oscillation, accompanying the transition from partial to full penetration. The voltage signal curve lost the

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Belov, Alexey S. "Features of generation and propagation of the extremely low frequency waves excited in the ionosphere under the powerful HF radioemission influence." Physics of Wave Processes and Radio Systems 24, no. 4 (2022): 53–62. http://dx.doi.org/10.18469/1810-3189.2021.24.4.53-62.

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The experimental results of the extremely low frequency emission characteristics excited in the outer ionosphere under the ionospheric plasma heating by high-latitude EISCAT facility are presented. The experiments have been conducted in the period of 20062010 yr. using two main schemes of extremely low frequency generation including the impact of the heating facility amplitude modulated emission and two unmodulated pump waves with the frequency detuning. In-situ measurements of the plasma wave disturbances were performed at the outer ionosphere heights using on-board equipment of DEMETER micro

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CHEN, YANQING, and LIUQING PEI. "ANALYSIS OF THE RECOVERED SIGNAL IN SYNCHRONIZED CHUA’S COMMUNICATION SYSTEM." International Journal of Bifurcation and Chaos 06, no. 08 (1996): 1595–600. http://dx.doi.org/10.1142/s0218127496000965.

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The recovered message signal in the synchronized Chua’s system, which is proposed for secure communications, is analyzed by means of both numerical simulations and analytical methods. The results show that the characteristic of “frequency response” of the system is independent of the amplitude of the input message signal, and the amplitude of the recovered signal is suppressed by the system in the lower frequency range and amplified in the higher frequency range. Specifically, we find that, as the frequency of the input signal increases continuously, there is a band of frequency over which a r

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Pigulevskiy, Petro, Yuliia Semenova, Yurii Lisovyi, Oleksandr Kendzera, and Serhii Kravets. "Amplification effects of ground motion due to the local geology of the building site in the cities of Kyiv, Kryvyi Rih, Odesa." IOP Conference Series: Earth and Environmental Science 1348, no. 1 (2024): 012088. http://dx.doi.org/10.1088/1755-1315/1348/1/012088.

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Abstract The results of the research presented in the article elucidate the importance of taking into account the amplitude-frequency characteristics of soil stratum models in the context of seismic safety of construction objects on the territory of Ukraine, in different regions. The presented results of the analysis of the calculated amplitude-frequency characteristics of models of soil environments for different regions of Ukraine reveal that the amplification of vibrations by soils has a complex nature that depends on many factors and can differ significantly for different construction site

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Li, Hai Feng, Yu Zhi Luo, Xiao Long Zhang, and Deng Pan. "Vehicle Body and Wheel Motion Simulation Platform Based on LabVIEW." Applied Mechanics and Materials 241-244 (December 2012): 2113–19. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.2113.

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The work in the paper constructed a platform for vehicle’s controllability and stability study conveniently and efficiently. Based on the dynamic model of the two-mass vibration system of vehicle body and wheel, the paper builds a vibration platform using the graphical programming software LabVIEW. It establishes a sinusoidal input road surface model, simulates the sinusoidal road surface under different amplitude and frequencies, and makes it the excitation source of the vibration system. It also obtains the curves of the amplitude-frequency characteristic of vehicle body and wheel displaceme

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Fernanda, E., A. Bilqis, L. Julio, et al. "Early Result for Microtremor Characteristic Observation in Merapi and Merbabu." IOP Conference Series: Earth and Environmental Science 873, no. 1 (2021): 012077. http://dx.doi.org/10.1088/1755-1315/873/1/012077.

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Abstract The arc magmatism and volcanic activity in Java are dominated by the subducting plate of Indo-Australian into the Eurasian plate. Merapi volcano is located in Central Java and known as one of the most active volcanoes in the world. Several studies have tried to estimate the magma reservoir zone in Mt. Merapi and suggested multiple layers of reservoirs with the shallow one at 1-2 km and a deeper at 6 -9 km or 15 km. The Low-Frequency Passive Seismic is one method to analyze the frequency spectrum below the recording station. Previous related studies show a promising a relation between

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Nazarov, V. E., and S. B. Kiyashko. "NONLINEAR EFFECTS IN CRYSTALLINE SOLIDS WITH SATURATION OF AMPLITUDE-DEPENDENT INTERNAL FRICTION, DECREASING WITH IN-CREASING FREQUENCY." Физика металлов и металловедение 124, no. 6 (2023): 467–76. http://dx.doi.org/10.31857/s001532302360020x.

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As a result of modification of quasi-static elastic and inelastic hysteresis, dynamic hysteresis equations of state of crystalline solids with frequency-dependent saturation of amplitude-dependent internal friction decreasing with increasing frequency are proposed. The nonlinear propagation of initially harmonic longitudinal elastic waves in rods made of such materials is investigated by the perturbation method. Numerical, graphical and comparative analysis of the obtained solutions is carried out and characteristic amplitude-frequency dependenc-es of nonlinear wave effects are revealed. A met

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

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Impulsive noise, generated by inverters and other equipment used in the field, tends to easily enter test channels in scenarios where continuous frequency conversion signals are employed to test the frequency response of electrohydraulic proportional valves. Interference caused by such noise reduces the signal-to-response ratio of response signals, thereby influencing the accuracy of the frequency response of proportional valves. To address this concern, in this article, an integrated filtering method that combines ensemble empirical mode decomposition with median filtering is proposed. The pr

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Xing, Ya Min, Sheng Hu Liu, and Dong Xu Wang. "Design and Research on Piezoelectric Acceleration Geophone." Advanced Materials Research 468-471 (February 2012): 826–30. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.826.

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A kind of piezoelectricity acceleration geophone is studied and discussed. carried on its amplitude frequency, phase-frequency characteristic theoretically, obtained the primary factor of the influence on frequency response, and improved in the piezoelectric crystal choice and geophone structure. The theory and the field test result indicated that, this piezoelectricity acceleration geophone has better response characteristic on low frequency and the high-frequency as well as a higher sensitivity, it is one better detection method.

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Brzhezitsky, V. O., Y. O. Haran, A. O. Derzhuk, O. R. Protsenko, Y. O. Trotsenko, and M. M. Dixit. "Ultimate effect of non-identity of capacitive elements of high-voltage arm on frequency characteristics of voltage divider (analytical research)." Electrical Engineering & Electromechanics, no. 4 (July 29, 2021): 46–52. http://dx.doi.org/10.20998/2074-272x.2021.4.06.

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Purpose. Determination in the analytical form of the maximum limiting influence of the non-identity of the capacitive elements of the high-voltage arm on the amplitude-frequency characteristic and phase-frequency characteristic of the voltage divider with parallel-series connection of R-, C-elements of the high-voltage arm. Methodology. Based on the previously developed theory of broadband voltage dividers with parallel-series connection of R-, C-elements, analytical expressions for amplitude-frequency and phase-frequency characteristics of the voltage divider are obtained and investigated tak

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Brzhezitsky, V. O., Y. O. Haran, Y. O. Trotsenko, O. R. Protsenko, A. O. Derzhuk, and M. M. Dixit. "Ultimate effect of non-identity of resistive elements of high-voltage arm on frequency characteristics of broadband voltage divider (analytical research)." Electrical Engineering & Electromechanics, no. 3 (April 23, 2023): 52–58. http://dx.doi.org/10.20998/2074-272x.2023.3.08.

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Purpose. Determination in the analytical form of the maximum limiting influence of the non-identity of the resistive elements of the high-voltage arm on the amplitude-frequency characteristic and phase-frequency characteristic of the voltage divider with parallel-series connection of R-, C-elements of the high-voltage arm. Methodology. Based on the previously developed theory of broadband voltage dividers with parallel-series connection of R‑, C-elements, analytical expressions for amplitude-frequency and phase-frequency characteristics of the voltage divider are obtained and investigated taki

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