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Journal articles on the topic 'Influence of tuning coefficients'

Author: Grafiati

Published: 4 June 2025

Last updated: 14 July 2025

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1

Alexeyev, C. N., S. S. Alieva, E. V. Barshak, B. P. Lapin, and M. A. Yavorsky. "Influence of attenuation on the generation of optical vortices in multihelicoidal optical fibers." Journal of Physics: Conference Series 2103, no. 1 (2021): 012149. http://dx.doi.org/10.1088/1742-6596/2103/1/012149.

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Abstract In this paper we have studied influence of attenuation on conversion processes of the fundamental mode (FM) in multihelicoidal optical fibers (MHF) in the vicinity of the point of accidental spectrum degeneracy within the framework of the scalar approximation. To this end, we have obtained expressions for modes of the MHF, which consist of the FM and an optical vortex (OV), and shown that conversion of the FM into the OV takes place. The difference in the attenuation coefficients for the partial fields of MHF’s modes leads to deterioration in the conversion process even with an ideal

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2

Tsamados, Michel, Daniel L. Feltham, David Schroeder, et al. "Impact of Variable Atmospheric and Oceanic Form Drag on Simulations of Arctic Sea Ice*." Journal of Physical Oceanography 44, no. 5 (2014): 1329–53. http://dx.doi.org/10.1175/jpo-d-13-0215.1.

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Abstract Over Arctic sea ice, pressure ridges and floe and melt pond edges all introduce discrete obstructions to the flow of air or water past the ice and are a source of form drag. In current climate models form drag is only accounted for by tuning the air–ice and ice–ocean drag coefficients, that is, by effectively altering the roughness length in a surface drag parameterization. The existing approach of the skin drag parameter tuning is poorly constrained by observations and fails to describe correctly the physics associated with the air–ice and ocean–ice drag. Here, the authors combine re

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3

Behling, Anja-Verena, Marlene Giandolini, Vinzenz von Tscharner, and Benno Maurus Nigg. "Soft-tissue vibration and damping response to footwear changes across a wide range of anthropometrics in running." PLOS ONE 16, no. 8 (2021): e0256296. http://dx.doi.org/10.1371/journal.pone.0256296.

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Different factors were shown to alter the vibration characteristics of soft-tissue compartments during running. Changing pre-heel strike muscle activation or changing footwear conditions represents two possibilities to influence the vibration response via frequency shift or altered damping. Associated with the study of muscle pre-tuning is the difficulty in quantifying clean experimental data for the acceleration of soft-tissue compartments and muscle activities in heterogeneous populations. The purpose of this study was to determine the vibration and pre-tuning response to footwear across a w

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Fresia, Paola, and Massimo Rundo. "Lumped parameter model and experimental tests on a pressure limiter for variable displacement pumps." E3S Web of Conferences 197 (2020): 07005. http://dx.doi.org/10.1051/e3sconf/202019707005.

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The paper presents the lumped parameter model of a pressure limiter for axial piston pumps developed in the Simcenter Amesim® environment. The control includes both the absolute and differential (load sensing) pressure limiter in a single body. The continuous position valve was tested experimentally alone on a test rig in order to estimate the discharge coefficients required for tuning the model. The tests were performed at imposed positions of the spool and the corresponding modulated pressure and control flow through the valve were measured. A contactless transducer was used for measuring wi

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Corte-Leon, P., I. Skorvanek, F. Andrejka, et al. "Temperature influence on magnetic properties and magnetoimpedance effect of Fe-rich glass-coated microwires." AIP Advances 13, no. 2 (2023): 025337. http://dx.doi.org/10.1063/9.0000466.

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Giant magnetoimpedance, GMI, effect and magnetic properties upon temperature influence of as-prepared and stress-annealed amorphous Fe75B9Si12C4 glass-coated microwires produced by the Taylor-Ulitovsky technique are analyzed. Remarkable change in the hysteresis loops and GMI effect is observed for both samples upon heating. Tuning of the stress-annealing conditions allows one to vary the temperature dependence. Furthermore, it is observed almost complete reversibility of the changes induced by the temperature. Observed dependences are explained by the heating effect on the internal stresses re

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Kaplunov, Saveliy, Natalia Valles, and Denis Toporov. "DYNAMIC ANALYSIS AND FORMULATION OF THE SOLUTION FOR COMPLEX PROBLEM OF DURABILITY INCREASE FOR STRUCTURAL ELEMENTS IN A TURBULENT FLOW OF THE MEDIUM." Bulletin of Science and Technical Development, no. 162 (2021): 36–45. http://dx.doi.org/10.18411/vntr2021-162-3.

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When designing the structures of modern hydroelastic systems in power engineering, namely heat exchangers for various purposes, effective frequency tuning should be purposefully carried out to prevent intense vibration of individual elements. To do this, it is necessary, in accordance with the specified resource requirements, to provide reasonably defined ratios of various values of the natural oscillation frequencies of the structural elements and the characteristic nearest excitation frequencies in the flow. The optimal choice of the values of the frequency tuning coefficients is realized ta

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Ziatdinov, Sergey, and Leonid Osipov. "Suppression of correlated interference by adaptive notch filters under pulse repetition period modulation." Information and Control Systems, no. 3 (June 29, 2021): 53–60. http://dx.doi.org/10.31799/1684-8853-2021-3-53-60.

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Introduction: We discuss the problem of correlated noise suppression by adaptive complex notch filters of various orders. In order to eliminate the dependence of the transmission coefficient of the useful signal on its frequency, the pulse repetition period is modulated. Purpose: Studying the influence of pulse repetition period modulation on the correlated noise suppression coefficient. Methods: The notch filter parameters were optimized with the criterion of minimum average dispersion of correlated noise at the output of the filters during the repetition period modulation. Results: Expressio

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Uddin, Mesbah, and Nazarii Olkhovskyi. "Computational Fluid Dynamics Analyses on How Aerodynamic Rule Changes Impact the Performance of a NASCAR Xfinity Racing Series Racecar." Vehicles 6, no. 3 (2024): 1545–70. http://dx.doi.org/10.3390/vehicles6030073.

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The Xfinity Racing Series is an American stock car racing series organized by NASCAR. For the 2017 racing season, NASCAR introduced new regulations with the objective of creating a level playing field by reducing aerodynamic influence on vehicle performance. In this context, the primary objective of this work is to explore the differences in the aerodynamic performance between the 2016 and 2017 Toyota Camry Xfinity racecars using only open-source Computational Fluid Dynamics (CFD) and CAE tools. During the CFD validation process, it was observed that none of the standard turbulence models, wit

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9

Kinjo, Tomihiro, Yuichi Sei, Niccolo Giannetti, Kiyoshi Saito, and Koji Enoki. "Prediction of Boiling Heat Transfer Coefficient for Micro-Fin Using Mini-Channel." Applied Sciences 14, no. 15 (2024): 6777. http://dx.doi.org/10.3390/app14156777.

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The prediction of the heat transfer coefficient commonly relies on the development of new empirical prediction equations when operating conditions and refrigerants change from the existing equations. Creating new prediction equations is expensive and time-consuming; therefore, recent attention has been given to machine learning approaches. However, machine learning requires a large amount of data, and insufficient data can result in inadequate accuracy and applicability. This study showed that using mini-channel data as highly relevant data for the micro-fin heat transfer coefficient yields hi

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Zhang, Shibo, Yishan Liu, Pingfei Li, et al. "Study of instability mechanisms of trucks turning right at long downhill T-junctions based on Trucksim simulation." PLOS ONE 18, no. 3 (2023): e0282779. http://dx.doi.org/10.1371/journal.pone.0282779.

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The aim of this study was to investigate the influence of road factors on the safety speed threshold of a lorry turning right around a corner at a the bottom of a long downhill T-junction. Trucksim simulation software was chosen to construct a model for investigating the turning instability mechanism. A three-axle truck was chosen as the simulation vehicle and road adhesion coefficients of 0.2–0.75, road super-elevations of -2–8%, turning radii of 20–100 m, and vehicle overcharge of 0–100% selected for tuning. Simulation experiments were carried out for different bending conditions, investigat

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Jalali, Peyman, Mohammad-Reza Sayyed Noorani, Reza Hassannejad, and Mir Mohammad Ettefagh. "Modeling the central nervous system functionality in controlling the calf muscle activity during running with sport shoes." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 233, no. 2 (2019): 254–66. http://dx.doi.org/10.1177/0954411918821390.

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Biological findings show that the activity of the calf muscle group is controlled by the central nervous system during running. The central nervous system tries to retain the peak values of the ground reaction force at constant levels as well as to minimize the vibration amplitude of soft tissues of the lower leg. Furthermore, these objectives are functions of stiffness and damping (compliance properties) of the calf muscle-tendon unit, especially gastrocnemius-Achilles. In this article, a new model for the calf muscle-tendon unit activity is presented in which the coefficients of stiffness an

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Brouzet, C., E. V. Ermanyuk, M. Moulin, G. Pillet, and T. Dauxois. "Added mass: a complex facet of tidal conversion at finite depth." Journal of Fluid Mechanics 831 (October 13, 2017): 101–27. http://dx.doi.org/10.1017/jfm.2017.616.

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This paper revisits the problem of tidal conversion at a ridge in a uniformly stratified fluid of limited depth using measurements of complex-valued added mass. When the height of a sub-marine ridge is non-negligible with respect to the depth of the water, the tidal conversion can be enhanced in the supercritical regime or reduced in the subcritical regime with respect to the large depth situation. Tidal conversion can even be null for some specific cases. Here, we study experimentally the influence of finite depth on the added mass coefficients for three different ridge shapes. We first show

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13

Zhyvtsova, L. I., H. V. Ukhina, V. S. Sytnikov, O. V. Streltsov, and P. V. Stupen. "Integrated improvement of the efficiency of computer control system of spatial orientation settings of drilling facilities." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 1 (February 28, 2022): 116–22. http://dx.doi.org/10.33271/nvngu/2022-1/116.

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Purpose. Improving the efficiency of the system by increasing the accuracy in determining the drilling objects spatial orientation, as well as adjusting the system components to more accurately isolate the information signal from the angle transducer. Methodology. A comprehensive increase in the angle transducer accuracy is based on taking into account the influence of factors and errors in determining the drilling objects spatial orientation, as well as a possibility of smoothly tuning the characteristics of the receiving part due to the departure of the information modulated signal frequency

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14

Tarasov, Evgeny M., and Anna E. Tarasova. "Automated Train Coordinate Determination System with Self-Tuning of the Decision Function." Engineering Technologies and Systems 32, no. 3 (2022): 437–59. http://dx.doi.org/10.15507/2658-4123.032.202203.437-459.

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Introduction. The problem of determining the train coordinates on the approach section to the crossing is associated with the impact of destabilizing factors on the information primary detector ? the rail line with distributed parameters. This leads to an error in calculating train coordinates. The aim of the study is to develop and scientifically substantiate the principle of building a system for calculating train coordinates with self-tuning of the decision function under the influence of significant destabilizing factors on the information primary sensor. Materials and Methods. To solve th

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Nguyen, Tuan Anh. "Active Disturbance Rejection Control for an automotive suspension system based on parameter tuning using a fuzzy technique." PLOS ONE 20, no. 1 (2025): e0313104. https://doi.org/10.1371/journal.pone.0313104.

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Road surface roughness is the cause of vehicle vibration, which is considered a system disturbance. Previous studies on suspension system control often ignore the influence of disturbances while designing the controller, leading to system performance degradation under severe vibration conditions. In this work, we propose a control method to improve active suspension performance that reduces vehicle vibration by eliminating the influence of road disturbances. The proposed method is formed based on the combination of an Active Disturbance Rejection Control (ADRC) technique with control coefficie

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16

Edigarev, Andrey, Mihail Shemet, and Vsevolod Eliseev. "STUDY OF THE POSSIBILITY OF INCREASING THE RESOURCE PERFORMANCE OF A GAS TURBINE ENGINE AS COMPOSITION OF A SEQUENTIAL HYBRID POWERTRAIN." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 76 (2024): 5–14. http://dx.doi.org/10.15593/2224-9982/2024.76.01.

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The results of experimental studies carried out in the course of research tests of a demonstrator of a sequential hybrid powertrain based on a VK-100-1MK gas turbine engine are presented. It is shown that the presence of a battery provides a smoother change of the gas turbine engine mode and, therefore, an increase in the resource indicators of the latter by reducing the gradients of the temperature field in the hot section parts during transients. A model cycle of operation was developed for the demonstrator of a sequential type hybrid powertrain. A consistent increase in the mechanical load

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17

Orszulik, Magdalena, Adam Fic, and Tomasz Bury. "CFD modeling of passive autocatalytic recombiners." Nukleonika 60, no. 2 (2015): 347–53. http://dx.doi.org/10.1515/nuka-2015-0050.

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Abstract This study deals with numerical modeling of passive autocatalytic hydrogen recombiners (PARs). Such devices are installed within containments of many nuclear reactors in order to remove hydrogen and convert it to steam. The main purpose of this work is to develop a numerical model of passive autocatalytic recombiner (PAR) using the commercial computational fluid dynamics (CFD) software ANSYS-FLUENT and tuning the model using experimental results. The REKO 3 experiment was used for this purpose. Experiment was made in the Institute for Safety Research and Reactor Technology in Julich (

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18

Yang, Yu Min, Xi Ping Wang, Li Guo, and Man Fan. "Control Parameter Tuning of Magnetic Bearing PID Controller Based on Expansion Coefficient Critical Proportion." Applied Mechanics and Materials 150 (January 2012): 24–29. http://dx.doi.org/10.4028/www.scientific.net/amm.150.24.

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The digital PID controller system for magnetic bearing was described in this paper which combined Matlab technique with simulation of the magnetic bearing control to reach the influence of parameters of digital PID controller for magnetic bearing control system. The application of the expansion coefficient critical proportion for turning parameters of digital PID controller can achieve better results. Finally, provide a simple and efficient method for numerical controller of magnetic bearing.

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19

Shokoohinia, Mohammad Reza, and Mohammad Mehdi Fateh. "Robust dynamic sliding mode control of robot manipulators using the Fourier series expansion." Transactions of the Institute of Measurement and Control 41, no. 9 (2018): 2488–95. http://dx.doi.org/10.1177/0142331218802357.

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This paper presents a robust dynamic sliding mode control for electrically driven robot manipulators. The control law computes the motor voltages based on the voltage control strategy. Uncertainties are estimated using the Fourier series expansion and the truncation error is compensated. The Fourier coefficients are tuned based on the stability analysis. The contribution of this paper is designing a robust controller using a novel adaptive Fourier series expansion. In comparison with previous related works based on the Fourier series expansion, the superiority of this paper is presenting an ad

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Sinha, Ashank, D. Karmakar, and C. Guedes Soares. "Hydrodynamic performance of concentric arrays of point absorbers." International Journal of Ocean and Climate Systems 7, no. 3 (2016): 88–94. http://dx.doi.org/10.1177/1759313116649965.

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The behaviour of arrays of 12 heaving point absorbers in concentric arrangements is numerically assessed in a frequency domain model. The floaters are attached to a central cylindrical bottom-mounted structure. Each point absorber is restricted to the heave mode and is assumed to have its own linear power take-off system consisting of an external damping coefficient enabling power extraction and a supplementary mass coefficient tuning the point absorber to the incoming waves. The external damping and supplementary mass coefficients are optimized to maximize the power absorption by each floater

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21

Vereshchago, Y. M., V. I. Kostiuchenko, M. V. Dzhanhyrov, A. P. Yeremenko, and Y. V. Stohniienko. "Optimization of arc current pi regulator parameters by sofrware modeling." Electrical Engineering and Power Engineering, no. 2 (June 14, 2025): 7–17. https://doi.org/10.15588/1607-6761-2025-2-1.

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Purpose. To create a computer model of a converter operating on a plasma arc and to determine the optimal values of the coefficients of the PI current controller, ensuring optimal switching between its operating modes and high quality of control processes. In doing so, use the MATLAB / Simulink software. Methodology. Computer simulation method, separation method – optimal filtering and optimal deterministic control and methods for adjusting regulators. Findings. A multilevel model was formed, the values of the PI current regulator tuning parameters were determined, at which the DC-DC converter

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22

Nafikov, T. A., M. N. Khanipov, N. F. Moginov, and A. V. Nasybullin. "DEVELOPMENT AND TESTING OF COMPENSATED CAPACITANCE MODEL FOR INTERWELL CONNECTIVITY DETERMINATION ON AN ACTUAL FIELD." Petroleum Engineering 23, no. 3 (2025): 62–73. https://doi.org/10.17122/ngdelo-2025-3-62-73.

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The article describes the Compensated Capacitance Model (CCM), and analyzed the results of its testing on data from a real object. The need for studies is due to the presence of periodic shutdowns in the operation of wells in oil fields, and the existing published studies on the type of models under consideration are mainly implemented on the data of foreign oil facilities. Availability of data with shut-in production wells makes it impossible to continuously calculate the model using the classic CRM method. A key feature of the CCM model is its way of accounting for production well outages. T

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Sundar, Udhay, Zichen Lao, and Kimberly Cook-Chennault. "Investigation of Piezoelectricity and Resistivity of Surface Modified Barium Titanate Nanocomposites." Polymers 11, no. 12 (2019): 2123. http://dx.doi.org/10.3390/polym11122123.

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Polymer-ceramic nanocomposite piezoelectric and dielectric films are of interest because of their possible application to advanced embedded energy storage devices for printed wired electrical boards. The incompatibility of the two constituent materials; hydrophilic ceramic filler, and hydrophobic epoxy limit the filler concentration, and thus, their piezoelectric properties. This work aims to understand the role of surfactant concentration in establishing meaningful interfacial layers between the epoxy and ceramic filler particles by observing particle surface morphology, piezoelectric strain

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Chen, Yu, Liping Chen, Yu Chen, Jianwan Ding, Yanbing Liu, and Dong Yan. "Control Parameters Design of Spraying Robots Based on Dynamic Feedforward." Electronics 13, no. 8 (2024): 1583. http://dx.doi.org/10.3390/electronics13081583.

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The positioning and velocity accuracy of spraying robots determine the quality of the coating, and the influence of the robotic dynamic characteristics on control precision is significant. This paper presents a method of linearizing dynamic characteristics into feedforward coefficients and designs a dual-loop control system consisting of an inner velocity loop and an outer position loop. The system is divided into three sections: a cascaded section, a feedback section, and a feedforward section. The cascaded section eliminates the nonlinear characteristics of the system; the feedback section e

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Golov, V. P., D. N. Kormilitsyn, and O. S. Sukhanova. "Transmitted power limit of controlled high voltage transmission line for modes on steady-state stability boundary." Vestnik IGEU, no. 2 (April 30, 2023): 28–35. http://dx.doi.org/10.17588/2072-2672.2023.2.028-035.

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The use of series compensation devices is one of the methods to increase the capacity of a power transmission line. In addition, the use of controlled series compensation devices affects the steady-state stability of the electric power system. It is also widely known that automatic excitation control of generators has a positive effect on the stability of the system. Thus, it is reasonable to analyze the influence of the adjustable parameters of the controlled series compensation device on the line capacity when considering modes at the boundaries of the stability regions, taking into account

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Wu, J., H. Hong, S. Shang, M. Dai, and Z. Lee. "Variation of phytoplankton absorption coefficients in the northern South China Sea during spring and autumn." Biogeosciences Discussions 4, no. 3 (2007): 1555–84. http://dx.doi.org/10.5194/bgd-4-1555-2007.

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Abstract. We examined the temporal and spatial variabilities of phytoplankton absorption coefficients (αphλ)) and their relationships with physical processes in the northern South China Sea from two cruise surveys during spring (May 2001) and late autumn (November 2002). A large river plume induced by heavy precipitation in May stimulated a phytoplankton bloom on the inner shelf, causing significant changes in the surface water in αph values and B/R ratios (αph(440)/αph(675)). This was consistent with the observed one order of magnitude elevation of chlorophyll α and a shift from a pico/nano d

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Kouadria, Khaled Madani, Ali Mahieddine, and Ahmed Baha Eddine Aichouni. "Advanced vibration control of cantilevered composite plates using macro fiber composites and PID controllers." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 2 (2024): e6707. http://dx.doi.org/10.54021/seesv5n2-096.

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This study explores the dynamic response and control strategies of a cantilevered plate equipped with Macro Fiber Composite (MFC) patches. By employing both passive and active control methodologies, we investigate the interplay of parameters that govern the plate's vibrational behavior. The passive control approach, involving the introduction of mass and stiffness with varying damping coefficients, effectively absorbed and dissipated vibrational energy, validating the finite element (FE) model used. The simulations showed that increasing the damping coefficient from 0.0002 to 0.004 resulted in

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Skočdopole, Jakub, Jaroslav Čech, Jiří Čapek, Karel Trojan, and Ladislav Kalvoda. "Preparation of HfNbTiTaZr Thin Films by Ionized Jet Deposition Method." Crystals 13, no. 4 (2023): 580. http://dx.doi.org/10.3390/cryst13040580.

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The ionized jet deposition (IJD) method is applied to the preparation of thin films composed of refractory HfNbTiTaZr high-entropy alloy (HEA). Due to its stoichiometric reliability, the IJD method provides a flexible tool for deposition of complex multi-element materials, such as HEAs. Scanning electron microscopy, energy-dispersion spectroscopy, confocal microscopy, and X-ray diffraction methods are used to characterize the influence of the applied accelerating voltage of the IJD deposition head ranging from 16 to 22 kV on the resulting morphology, chemical composition, thickness, crystallin

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Volkov, Alexey I., and Rostislav V. Apraksin. "Hofmeister Series for Conducting Polymers: The Road to Better Electrochemical Activity?" Polymers 15, no. 11 (2023): 2468. http://dx.doi.org/10.3390/polym15112468.

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Poly-3,4-ethylenedioxythiophene:polystyrene sulfonate (PEDOT:PSS) is a widely used conducting polymer with versatile applications in organic electronics. The addition of various salts during the preparation of PEDOT:PSS films can significantly influence their electrochemical properties. In this study, we systematically investigated the effects of different salt additives on the electrochemical properties, morphology, and structure of PEDOT:PSS films using a variety of experimental techniques, including cyclic voltammetry, electrochemical impedance spectroscopy, operando conductance measurement

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Golov, V. P., D. N. Kormilitsyn, and O. S. Sukhanova. "Comparison of characteristics of lines of high and extra-high voltage when selecting the parameters of controlled device of series compensation." Vestnik IGEU, no. 3 (June 30, 2024): 39–45. http://dx.doi.org/10.17588/2072-2672.2024.3.039-045.

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The use of series compensation devices leads to an increase of the transmission line capacity. However, it also increases the risk of an oscillatory violation of the stability of the electric power system. Cumulative hunting and self-excitation of the system is observed in the systems with controlled series compensation devices with a high degree of capacitive compensation. It is known that automatic excitation control of generators partially eliminates the negative effect of series capacitive compensation on oscillatory stability. Therefore, when choosing the tuning parameters of controlled d

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Archilla, Diego, Jesús López-Sánchez, Antonio Hernando, Elena Navarro, and Pilar Marín. "Boosting the Tunable Microwave Scattering Signature of Sensing Array Platforms Consisting of Amorphous Ferromagnetic Fe2.25Co72.75Si10B15 Microwires and Its Amplification by Intercalating Cu Microwires." Nanomaterials 11, no. 4 (2021): 920. http://dx.doi.org/10.3390/nano11040920.

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The following work addresses new configurations of sensing array platforms that are composed of Co-based amorphous ferromagnetic microwires (MWs) to obtain an enhanced modulation of the microwave scattering effects through the application of low strength DC or AC magnetic fields. An amorphous MW is an ultrasoft ferromagnetic material (coercivity ~0.2 Oe) with a circumferential magnetic anisotropy that provides a high surface sensitivity when it is subjected to an external magnetic field. Firstly, microwave scattering experiments are performed as a function of the length and number of MWs place

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Quintal, Beatriz, Stefan M. Schmalholz, and Yuri Y. Podladchikov. "Impact of fluid saturation on the reflection coefficient of a poroelastic layer." GEOPHYSICS 76, no. 2 (2011): N1—N12. http://dx.doi.org/10.1190/1.3553002.

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The impact of changes in saturation on the frequency-dependent reflection coefficient of a partially saturated layer was studied. Seismic attenuation and velocity dispersion in partially saturated (i.e., patchy saturated) poroelastic media were accounted for by using the analytical solution of the 1D White’s model for wave-induced fluid flow. White’s solution was applied in combination with an analytical solution for the normal-incidence reflection coefficient of an attenuating layer embedded in an elastic or attenuating background medium to investigate the effects of attenuation, velocity dis

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Zhou, Changcheng, Leilei Zhao, Yuewei Yu, Fuxing Yang, and Song Wang. "Kinetodynamic Model and Simplified Model of X-Type Seat System with an Integrated Spring Damper." Shock and Vibration 2018 (October 3, 2018): 1–10. http://dx.doi.org/10.1155/2018/4962436.

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A simplified analytical model with transformation coefficients of X-type seat system with an integrated spring damper for control strategies development is proposed on the basis of a kinetodynamic model. Firstly, based on a commercial seat of trucks, the relationship between the suspension support force and the spring force was created by using virtual work principle. The analytical formulae of the equivalent stiffness Ke and the stiffness transformation coefficient ρk were deduced. Based on the principle of conservation of energy, the analytical formulae of the equivalent damping coefficient

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Baumann, Frank, Theresa Paul, Susan Wassersleben, Ralf Regenthal, Dirk Enke, and Achim Aigner. "Characterization of Drug Release from Mesoporous SiO2-Based Membranes with Variable Pore Structure and Geometry." Pharmaceutics 14, no. 6 (2022): 1184. http://dx.doi.org/10.3390/pharmaceutics14061184.

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Transdermal drug delivery systems (TDDSs) play important roles in therapy due to distinct advantages over other forms and types of drug application. While common TDDS patches mainly consist of polymeric matrices so far, inorganic carriers show numerous advantages such as high mechanical stability, possible re-use and re-loading of drugs, and a broad chemical compatibility with therapeutically relevant compounds and chemical enhancers. Mesoporous glasses can be prepared in different monolithic shapes, and offer a particularly wide range of possible pore volumes, pore diameters, and specific sur

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Klyuyev, O., O. Sadovoi, and Y. Sokhina. "RESEARCH SENSITIVITY OF THE ROTOR FLUX LINKAGE OBSERVER TO CHANGE PARAMETERS OF THE ASYNCHRONOUS MACHINE." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 1, no. 38 (2021): 57–67. http://dx.doi.org/10.31319/2519-2884.38.2021.7.

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When changing the parameters of the control object to ensure the required quality of control, the tuning parameters of the control system must be changed. Investigation of the sensitivity of mathematical models helps to choose the right technical parameters of the regulators. Therefore, there is an urgent scientific task, which consists in the development of mathematical models for calculating the steady-state values of the sensitivity functions of the coordinates of non-linear systems to changes in their parameters. When synthesizing observers of the rotor flux linkage, it is indicate

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Huang, Shenglong, and Lingyun Hu. "A study of Machine Learning for Prediction in Panel Data." International Journal of Computer Science and Information Technology 3, no. 2 (2024): 302–13. http://dx.doi.org/10.62051/ijcsit.v3n2.33.

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With the development of the times, the prediction study of machine learning in panel data is becoming more and more extensive, this paper adopts the RNN algorithm and XGBoost algorithm to carry out the prediction study on the quarterly GDP panel data of 31 provinces and cities in China from the 1st quarter of 2005 to the 4th quarter of 2023, and compares and analyses the two methods. In the forecasting study, this paper considers the influence of geographic location in the panel data, and the results show that there are significant regional differences in the RNN algorithm in forecasting, and

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BEZVESILNA, OLENA, SERGEY NECHAI, TETIANA TOLOCHKO, and MARIIA GRYNEVYCH. "RESEARCH OF THE CHANGE OF THE STABILIZER CONSTRUCTION MODEL WITH THE PURPOSE OF INCREASING ACCURACY." Herald of Khmelnytskyi National University. Technical sciences 319, no. 2 (2023): 36–43. http://dx.doi.org/10.31891/2307-5732-2023-319-1-36-43.

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The article solves an actual problem – changes in the stabilizer construction model are investigated in order to increase accuracy. In the process of optimization, the main variants of the optimal values of the adjustment coefficients of the stabilizer control unit were determined. For the first three variants of the tuning coefficients, comparative modeling was carried out using two types of DCS: GT 46 and G20-075-100 with a bandwidth of 100 Hz. It is shown that an increase in the amplification factor has a positive effect on the rigidity of the system. It is shown that, in contrast to the st

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Maxa, Jiří, Pavla Šabacká, Robert Bayer, et al. "The Tuning of a CFD Model for External Ballistics, Followed by Analyses of the Principal Influences on the Drag Coefficient of the .223 Rem Caliber." Technologies 13, no. 5 (2025): 190. https://doi.org/10.3390/technologies13050190.

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This paper presents the subject of external ballistics. The presented research employs a contemporary methodological approach, integrating theoretical analysis, CFD simulations, and experimental measurements. External ballistics is characterized by a wide spectrum of physical phenomena that influence projectile trajectory. This contribution focuses on the analysis of drag force acting on a .223 rem caliber projectile in both subsonic and supersonic regimes. Based on experimental findings, a CFD model was refined and subsequently used to evaluate the drag force and drag coefficient, with a comp

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Horbert, Victoria, Matthias Lange, Thomas Reuter, et al. "Comparison of Near-Infrared Spectroscopy with Needle Indentation and Histology for the Determination of Cartilage Thickness in the Large Animal Model Sheep." CARTILAGE 10, no. 2 (2017): 173–85. http://dx.doi.org/10.1177/1947603517731851.

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The suitability of near-infrared spectroscopy (NIRS) for non-destructive measurement of cartilage thickness was compared with the gold standard needle indentation. A combination of NIRS and biomechanical indentation (NIRS-B) was used to address the influence of varying loads routinely applied for hand-guided NIRS during real-life surgery on the accuracy of NIRS-based thickness prediction. NIRS-B was performed under three different loading conditions in 40 osteochondral cylinders from the load-bearing area of the medial and lateral femur condyle of 20 cadaver joints (left stifle joints; female

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Xue, Xiaocen, Jiejie Huang, and Shun Sang. "Variable Power Tracking Control Strategy of Doubly Fed Induction Generators for Fast Frequency Responses." Electronics 13, no. 6 (2024): 1071. http://dx.doi.org/10.3390/electronics13061071.

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Frequency regulation and droop control of doubly fed induction generators (DFIGs) can quickly respond to frequency changes and reduce the maximum rate of frequency (MROFF) in power systems. However, due to real-time dynamic changes in the MPPT control loop, the ability to improve the lowest frequency point is limited. Therefore, this article first describes an in-depth analysis of the dynamic characteristics of the incremental power of frequency regulation with droop control using an equivalent linear model. The limitations of improving the lowest frequency point under the influence of dynamic

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Lawal, Yusuf Babatunde, Pius Adewale Owolawi, Chunling Tu, Etienne Van Wyk, and Joseph Sunday Ojo. "Machine learning-based models for forecasting radio refractivity over the coastal area of South Africa." Edelweiss Applied Science and Technology 9, no. 1 (2024): 72–80. http://dx.doi.org/10.55214/25768484.v8i6.3109.

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Surface refractivity is a crucial parameter that determines the bending of radio signals as they propagate within the troposphere. It is greatly influenced by the atmospheric weather conditions and changes rapidly, especially in the coastal areas. This research utilized 50 years (1974-2023) surface temperature, pressure, and humidity data from six coastal stations in South Africa to forecast radio refractivity in the Mediterranean climate. Five machine learning models: Gated Recurrent Unit (GRU), Light Gradient Boosting Machine (LightGBM), Long-Short Term Memory (LSTM), Prophet, and Random For

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Mei, Song, Fengque Pei, Zhiyu Song, and Yifei Tong. "Design and Testing of Accurate Dicing Control System for Fruits and Vegetables." Actuators 11, no. 9 (2022): 252. http://dx.doi.org/10.3390/act11090252.

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It is hard to control the dicing size of current fresh-cutting devices for fruits and vegetables precisely, and this can be influenced by complex working environments. This paper looks at traditional three-dimensional fresh-cutting machines and, apart from analyzing the force-and-motion equation to determine the minimum rotational speed of the roller, the cross-cutting tool’s independent drive system, the speed detection system of the material before dicing, and shaft-speed monitoring have also been analyzed in order to develop precise control technology for three-dimensional fruit and vegetab

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Yu, Jianbo, Chengrui Wang, Ying Wang, et al. "Investigation on Stray-Capacitance Influences of Coaxial Cables in Capacitive Transducers for a Space Inertial Sensor." Sensors 20, no. 11 (2020): 3233. http://dx.doi.org/10.3390/s20113233.

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Ultra-sensitive inertial sensors are one of the key components in satellite Earth’s gravity field recovery missions and space gravitational wave detection missions. Low-noise capacitive position transducers are crucial to these missions to achieve the scientific goal. However, in actual engineering applications, the sensor head and electronics unit usually place separately in the satellite platform where a connecting cable is needed. In this paper, we focus on the stray-capacitance influences of coaxial cables which are used to connect the mechanical core and the electronics. Specially, for th

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Xu, Junfei, Junhua Wang, Yanming Wu, et al. "Prediction of Geometric Dimensions of Deposited Layer Produced Using Laser-arc Hybrid Additive Manufacturing." Micromachines 15, no. 7 (2024): 830. http://dx.doi.org/10.3390/mi15070830.

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Laser-arc hybrid additive manufacturing (LAHAM) holds substantial potential in industrial applications, yet ensuring dimensional accuracy remains a major challenge. Accurate prediction and effective control of the geometrical dimensions of the deposited layers are crucial for achieving this accuracy. The width and height of the deposited layers, key indicators of geometric dimensions, directly affect the forming precision. This study conducted experiments and in-depth analysis to investigate the influence of various process parameters on these dimensions and proposed a predictive model for acc

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Bushnell, Brittany N., and Anitha Pasupathy. "Shape encoding consistency across colors in primate V4." Journal of Neurophysiology 108, no. 5 (2012): 1299–308. http://dx.doi.org/10.1152/jn.01063.2011.

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Neurons in primate cortical area V4 are sensitive to the form and color of visual stimuli. To determine whether form selectivity remains consistent across colors, we studied the responses of single V4 neurons in awake monkeys to a set of two-dimensional shapes presented in two different colors. For each neuron, we chose two colors that were visually distinct and that evoked reliable and different responses. Across neurons, the correlation coefficient between responses in the two colors ranged from −0.03 to 0.93 (median 0.54). Neurons with highly consistent shape responses, i.e., high correlati

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Sajjad, Uzair, Imtiyaz Hussain, Muhammad Sultan, et al. "Determining the Factors Affecting the Boiling Heat Transfer Coefficient of Sintered Coated Porous Surfaces." Sustainability 13, no. 22 (2021): 12631. http://dx.doi.org/10.3390/su132212631.

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The boiling heat transfer performance of porous surfaces greatly depends on the morphological parameters, liquid thermophysical properties, and pool boiling conditions. Hence, to develop a predictive model valid for diverse working fluids, it is necessary to incorporate the effects of the most influential parameters into the architecture of the model. In this regard, two Bayesian optimization algorithms including Gaussian process regression (GPR) and gradient boosting regression trees (GBRT) are used for tuning the hyper-parameters (number of input and dense nodes, number of dense layers, acti

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Tigariev, V., O. Lopakov, V. Kosmachevskiy, A. Koliada, I. Lvov, and D. Dmytrenko. "SYNTHESIS OF A NEURAL NETWORK REGULATOR AND EXPERIMENTAL STABILITY STUDY FOR AN ADAPTIVE QUADCOPTER CONTROL SYSTEM." Odes’kyi Politechnichnyi Universytet Pratsi 2, no. 70 (2024): 95–107. https://doi.org/10.15276/opu.2.70.2024.12.

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When solving a number of complex manipulation tasks, it is advisable to take into account the nonlinear dynamics of the control object. Such tasks include, in particular, the control of large space-based manipulators, as well as ground-based manipulation systems used in construction and in the aftermath of accidents and disasters. For such manipulation systems, the control task is complicated by the fact that the dynamics of the controlled structure is very complex and, in most cases, cannot be mathematically described. In this regard, methods based on solving the inverse dynamics problem cann

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Kaufmann, Paul, Willi Koller, Elias Wallnöfer, et al. "Human motor control during movements with high demands." Current Issues in Sport Science (CISS) 9, no. 4 (2024): 006. http://dx.doi.org/10.36950/2024.4ciss006.

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Introduction & Purpose During training and competition, athletes must cope with numerous demands that can influence their performance. These include physiological and mental fatigue, psychological stress, and the ability to adapt quickly to varying situations. Controlling the high number of degrees of freedom with which the musculoskeletal system can produce movements is challenging for the central nervous system CNS (Bernstein, 1967), even without the context of a sporting setting. One common theory in the field of motor control posits the existence of muscle synergies (Turpin et al., 202

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Yepifanov, Sergiy, та Oleksii Bondarenko. "Аналіз точності оцінювання сталої часу одновального газотурбінного двигуна в реальних умовах". Aerospace Technic and Technology, № 4sup2 (29 серпня 2024): 69–79. http://dx.doi.org/10.32620/aktt.2024.4sup2.09.

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At present, the concept of an on-board self-tuning model has been formed and successfully developed by many scientific schools, and it provides real-time determination of parameters of the working process of engines, which are not measured. However, the problem of the accuracy of estimating parameters of dynamic models based on real data is clearly insufficiently studied, as a result of which there is a lack of recommendations for the formation of control influences on the engine, periodicity and duration of registration of parameters, as well as verification of the sufficiency of the collecte

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Barrera, Luisa, Daniel V. Esposito, Shane Ardo, and Rohini Bala Chandran. "Revealing the Role of Redox Reaction Selectivity and Mass Transfer in Current–Voltage Predictions for Ensembles of Photocatalysts." ECS Meeting Abstracts MA2024-01, no. 35 (2024): 1993. http://dx.doi.org/10.1149/ma2024-01351993mtgabs.

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Photocatalysts are conceptually simple reaction units where nanoscale semiconductors integrated with catalysts drive a pair of redox reactions on illumination. However, the proximity of reaction sites performing cathodic and anodic reactions poses dire challenges to realize large light-to-fuel conversion efficiencies. In this study, a powerful, yet straightforward, equivalent-circuit detail-balance modeling framework is developed and applied to evaluate the performance of photocatalytic systems featuring multiple light absorbers. Specifically, low bandgap iridium-doped strontium titanate is mo

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