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Journal articles on the topic 'Transient modes'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Brahma, I., and J. N. Chi. "Development of a model-based transient calibration process for diesel engine electronic control module tables – Part 1: data requirements, processing, and analysis." International Journal of Engine Research 13, no. 1 (2011): 77–96. http://dx.doi.org/10.1177/1468087411424376.

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This is the first part of a study investigating a model-based transient calibration process for diesel engines. The motivation is to populate hundreds of parameters (which can be calibrated) in a methodical and optimum manner by using model-based optimization in conjunction with the manual process so that, relative to the manual process used by itself, a significant improvement in transient emissions and fuel consumption and a sizable reduction in calibration time and test cell requirements is achieved. Empirical transient modelling and optimization has been addressed in the second part of thi

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Chan, S. H., X. S. Chen, and C. Arcoumanis. "Measurement and Signal Reconstruction of Transient Nitric Oxide Emissions in the Exhaust of a Turbocharged Diesel Engine." Journal of Dynamic Systems, Measurement, and Control 119, no. 4 (1997): 620–30. http://dx.doi.org/10.1115/1.2802370.

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A well-developed technique, based upon a combined experimental and phenomenological modeling approach, has been adopted for the measurement of nitric oxide (NO) emissions in a diesel engine exhaust under transient engine operation. The dynamic behavior of the chemiluminescent analyzer used for the measurement of NO emissions is characterized by a single gas diffusion model followed by three perfect gas-mixing models. The response of the analyzer is obtained using a computer-controlled transient NO emission simulator, which randomly generates a square-pulse train of NO gas and concurrently meas

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Wang, Yan Ting, Jing Hong Zheng, Xiao Yu Wang, Shou Zhen Zhu, and Hong Bo Zhu. "Investigation of Switching Transients between Operation Modes for Inverter-Based Microgrid." Advanced Materials Research 433-440 (January 2012): 7381–86. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.7381.

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This paper investigates the characteristics of the switching transients between the grid-connected and the autonomous modes for an inverter-based microgrid. The impact of the microgrid components including system line, load and inverter controller on the switching transients is analyzed through electromagnetic transient simulations. A soft switching scheme is also proposed in this paper to improve the microgrid switching performance.

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Semaan, Richard, Pradeep Kumar, Marco Burnazzi, Gilles Tissot, Laurent Cordier, and Bernd R. Noack. "Reduced-order modelling of the flow around a high-lift configuration with unsteady Coanda blowing." Journal of Fluid Mechanics 800 (June 29, 2016): 72–110. http://dx.doi.org/10.1017/jfm.2016.380.

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We propose a hierarchy of low-dimensional proper orthogonal decomposition (POD) models for the transient and post-transient flow around a high-lift airfoil with unsteady Coanda blowing over the trailing edge. The modal expansion comprises actuation modes as a lifting method for wall actuation following Graham et al. (Intl J. Numer. Meth. Engng, vol. 44 (7), 1999, pp. 945–972) and Kasnakoğlu et al. (Intl J. Control, vol. 81 (9), 2008, pp. 1475–1492). A novel element is separate actuation modes for different frequencies. The structure of the dynamic model rests on a Galerkin projection using the

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Bragin, Iliya Ye, and Vladimir I. Belozerov. "A study into the modes of the VVER-1000 RCP starting in an earlier inoperative loop." Nuclear Energy and Technology 5, no. 4 (2019): 305–11. http://dx.doi.org/10.3897/nucet.5.48393.

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To simulate the mode of the RCP starting in an earlier inoperative loop, KORSAR/GP, a code supporting coupled numerical modeling of neutronic and thermal-hydraulic transients in a VVER reactor plant in operating and emergency conditions, was chosen as the computational tool. Studying these modes using thermal-hydraulic codes makes it possible to analyze the course of transients and certain emergency processes without using commercial test procedures, which contributes to laying the groundwork for addressing the issues involved in ensuring the reliability, operating safety and efficiency of nuc

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Bragin, Iliya Ye., and Vladimir I. Belozerov. "A study into the modes of the VVER-1000 RCP starting in an earlier inoperative loop." Nuclear Energy and Technology 5, no. (4) (2019): 305–11. https://doi.org/10.3897/nucet.5.48393.

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To simulate the mode of the RCP starting in an earlier inoperative loop, KORSAR/GP, a code supporting coupled numerical modeling of neutronic and thermal-hydraulic transients in a VVER reactor plant in operating and emergency conditions, was chosen as the computational tool. Studying these modes using thermal-hydraulic codes makes it possible to analyze the course of transients and certain emergency processes without using commercial test procedures, which contributes to laying the groundwork for addressing the issues involved in ensuring the reliability, operating safety and efficiency of nuc

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Deibel, Alex. "OCEANg-MODES ON TRANSIENT NEUTRON STARS." Astrophysical Journal 832, no. 1 (2016): 44. http://dx.doi.org/10.3847/0004-637x/832/1/44.

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Verbytskyi, Ievgen, Roman Prybudko, Denys Zinchenko, and Maxym Matsyuk. "Reactive power compensator in transient modes." Bulletin of the National Technical University «KhPI» Series: New solutions in modern technologies 2, no. 26(1302) (2018): 121–25. http://dx.doi.org/10.20998/2413-4295.2018.26.42.

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Noack, Bernd R., Witold Stankiewicz, Marek Morzyński, and Peter J. Schmid. "Recursive dynamic mode decomposition of transient and post-transient wake flows." Journal of Fluid Mechanics 809 (November 21, 2016): 843–72. http://dx.doi.org/10.1017/jfm.2016.678.

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A novel data-driven modal decomposition of fluid flow is proposed, comprising key features of proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD). The first mode is the normalized real or imaginary part of the DMD mode that minimizes the time-averaged residual. The $N$th mode is defined recursively in an analogous manner based on the residual of an expansion using the first $N-1$ modes. The resulting recursive DMD (RDMD) modes are orthogonal by construction, retain pure frequency content and aim at low residual. Recursive DMD is applied to transient cylinder wake data an

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HEATON, C. J. "Optimal growth of the Batchelor vortex viscous modes." Journal of Fluid Mechanics 592 (November 14, 2007): 495–505. http://dx.doi.org/10.1017/s0022112007008634.

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We present calculations of optimal linear growth in the Batchelor (or q) vortex. The level of transient growth is used to quantify the effect of the viscous centre modes found at large Reynolds number and large swirl. The viscous modes compete with inviscid-type transients, which are seen to provide faster growth at short times. Following a smooth transition, the viscous modes emerge as dominant in a different regime at later times. A comparison is drawn with two-dimensional shear flows, such as boundary layers, in which weak instability modes (Tollmien–Schlichting waves) also compete with inv

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Nicolle, J., and J.-F. Morissette. "Development of a metamodel to predict the transient and dynamic structural behaviour of a hydraulic turbine." IOP Conference Series: Earth and Environmental Science 1483, no. 1 (2025): 012012. https://doi.org/10.1088/1755-1315/1483/1/012012.

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Abstract The present work deals with the construction of a simulation-based simplified model to provide stress of a hydraulic turbine during transient operation by leveraging two well-known concepts: hydraulic similarity and linear load combination. Because it combines multiple reduced order models, it is therefore called a metamodel. This strategy is applied to a 200 MW medium head Francis turbine which underwent an experimental campaign to acquire steady and transient stress signature. A modal analysis is first required to extract mode shapes, characteristics and corresponding stress tensors

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Ivanova, Viliya, and Igor Ivanov. "Research of Parameters of Electric Power Systems Affecting Core Saturation of Current Transformers with a Closed Magnetic Circuit in Transitional Short Circuit Modes." Известия высших учебных заведений. Электромеханика 64, no. 1 (2021): 92–100. http://dx.doi.org/10.17213/0136-3360-2021-1-92-100.

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The relevance of the study is due to the excess of the permissible errors of current transformers in transient short-circuit modes associated with saturation of the cores of current transformers. The latter leads to improper operation of relay protection devices, which can negatively affect the stability of electric power systems and the efficiency of industrial enterprises with a continuous technological cycle, the power failure of which leads to significant economic damage. The aim of this work is to study the parameters of electric power systems that affect the saturation of the cores of cu

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Keller, Teddie L., Richard Rotunno, Matthias Steiner, and Robert D. Sharman. "Upstream-Propagating Wave Modes in Moist and Dry Flow over Topography." Journal of the Atmospheric Sciences 69, no. 10 (2012): 3060–76. http://dx.doi.org/10.1175/jas-d-12-06.1.

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Abstract Previous studies have observed upstream-propagating modes in two-dimensional numerical simulations of idealized flow over topography with moist, nearly neutral conditions in the troposphere, topped by a stable stratosphere. The generation and propagation mechanisms for these modes were attributed to localized and dramatic changes in stability induced by the desaturation of the flow impinging on the mountain. In the present paper it is shown that these modes are transient upstream-propagating gravity waves, which are a fundamental feature of both moist and dry flow over topography of a

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Kislitcin, E. Yu, D. S. Lukashov, I. Yu Borisov, and A. A. Nazarov. "Modeling of induction motor operation modes considering supply voltage asymmetry." Proceedings in Cybernetics 24, no. 1 (2025): 26–30. https://doi.org/10.35266/1999-7604-2025-1-4.

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Induction motors are key elements of many electric power systems, especially electrification systems for technological installations of oil and gas facilities. Improving the efficiency, reliability and safety of induction motors requires accurate modelling of electromagnetic and mechanical processes, especially in transient conditions and with supply voltage asymmetry. This article presents a review of the mathematical model of a wound rotor induction motor based on the mesh-current method for interphase voltages. The model considers the influence of supply voltage asymmetry and provides an op

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Lizunov, Petro, and Valentyn Nedin. "Transmission shafts vibrations in transient rotating modes." Strength of Materials and Theory of Structures, no. 110 (June 26, 2023): 229–37. http://dx.doi.org/10.32347/2410-2547.2023.110.229-237.

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The paper presents the investigation results of the transmission shaft dynamic behavior in transient modes of motion with change of the rotational speeds. Such modes occur during the transmission shaft transmits torque from engine to executive device. This process can be accompanied by vibration with change of frequency and amplitude of shaft oscillation. Therefore, the question of studying the dynamic behavior of such systems with identifying the impact of rotational speeds changing on them is relevant. In this regard, the study was done by developed software, in which a technique of computer

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Hwang, Jin Kwon, Sangsoo Seo, Julian Sotelo Castanon, and Ho-Chan Kim. "DFT-Based Identification of Oscillation Modes from PMU Data Using an Exponential Window Function." Energies 12, no. 22 (2019): 4357. http://dx.doi.org/10.3390/en12224357.

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The characteristics of oscillation modes, such as interarea, regional, and subsynchronous modes, can vary during a power system fault, which can cause switching and control actions in the power system. Transient data of the modal response due to such a fault can be acquired through phasor measurement units (PMUs). When the transient data have a long duration, it is desirable to perform modal identification separately on each segment of the transient data, so as to reflect the varying characteristics of oscillation modes. A conventional discrete Fourier transform (DFT)-based method for parametr

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HEATON, C. J., and N. PEAKE. "Transient growth in vortices with axial flow." Journal of Fluid Mechanics 587 (August 31, 2007): 271–301. http://dx.doi.org/10.1017/s0022112007007434.

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We investigate transient growth in high-Reynolds-number vortices with axial flow. Manycases of vortex instability are not fully explained by strong exponential instability modes, and transient growth could offer an alternative route to breakdown in such cases. Strong transient growth is found, in agreement with previous studies. We first discuss the problem by reference to ducted vortices which model aeroengine flow. The transient growth is inviscid in character, and in this paper we specifically interpret it as an effect of the inviscid continuous spectrum. The relevant inviscid theory explai

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Lebedka, S. M., M. V. Petrovskyi, and I. M. Diahovchenko. "DEVELOPMENT OF A MATHEMATICAL MODEL OF TRANSITIONAL PROCESSES IN THE ELECTRICAL NETWORK IN PHASE COORDINATES." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 1 (1) (December 30, 2020): 56–60. http://dx.doi.org/10.20998/2224-0349.2020.01.08.

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Distribution electrical networks of great length are characterized by a high order of the system of equations of electromagnetic transients. To improve the efficiency of modelling such networks, it is necessary to develop formalized procedures that provide automation of both the solution and the formation of systems of equations using modern computer technology. To simplify the development of mathematical models, transformations are used to move from a real three-phase network to other coordinate systems, but this is achieved at the expense of additional restrictions. To solve the problems of

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Delaleau, Emmanuel. "Transient analysis of electrical drives: Applications to the permanent magnet synchronous generator." E3S Web of Conferences 433 (2023): 02008. http://dx.doi.org/10.1051/e3sconf/202343302008.

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This paper establishes that differential flatness, a property shared by most of the model of electrical drives, allows to perform transient analysis on the models of electrical machines, and especially electric generators which are so important in renewable energy systems (wind turbine, tidal turbine...). Transient analysis of electrical machines is indeed a difficult subject not completely solved today. The possibility to parameterize the trajectories of a system from the differential flatness property gives the possibility to perform simple transient analysis in various operation modes. The

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Solodyankin, Sergey, and Andrey Pazderin. "Increase of Transient Stability Level of Gas Turbine Power Plant Using FACTS." E3S Web of Conferences 139 (2019): 01049. http://dx.doi.org/10.1051/e3sconf/201913901049.

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The article is devoted to the development of the mathematical models of modern devices of flexible alternating current transmission systems (FACTS) when calculating the modes and stability of power systems and to the analysis of influence of the specified devices on transient stability of the generators. The considered scheme contains the generators with the gas turbine drive that have electromechanical parameters providing lower level of transient stability compared to units of higher power rating, which in some cases requires implementation of measures for transient stability enhancement. As

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Howell, E. C., J. R. King, S. E. Kruger, J. D. Callen, R. J. La Haye, and R. S. Wilcox. "Growing neoclassical tearing modes seeded via transient-induced-multimode interactions." Physics of Plasmas 29, no. 2 (2022): 022507. http://dx.doi.org/10.1063/5.0076253.

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Nonlinear extended magnetohydrodynamics simulations demonstrating seeding of neoclassical tearing modes (NTMs) via magnetohydrodynamics-transient-induced multimode interactions are presented. Simulations of NTMs are enabled by two recent NIMROD code developments: the implementation of heuristic neoclassical stresses and the application of transient magnetic perturbations (MPs) at the boundary. NTMs are driven unstable by the inherently pressure driven kinetic bootstrap current, which arises due to collisional viscosity between passing and trapped electrons. These simulations use heuristic clos

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Rejabov, Zaylobitdin Mamatovich. "Dynamic Models Of An Electromechanical Electric Drive System Of An Asynchronous Motor." American Journal of Engineering And Techonology 03, no. 04 (2021): 134–39. http://dx.doi.org/10.37547/tajet/volume03issue04-21.

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Asynchronous motors require its study not only in stationary modes, but also in dynamic ones. At the same time, this makes it possible to formulate the corresponding requirements for automatic control devices of a regulated IM, the implementation of which will ensure the optimal course of transient processes in the electric drive system; it requires its study not only in stationary modes, but also in dynamic ones. This simultaneously makes it possible to formulate the corresponding requirements for automatic control devices of variable IM, the implementation of which will ensure the optimal co

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Alizard, F., S. Pirozzoli, M. Bernardini, and F. Grasso. "Optimal transient growth in compressible turbulent boundary layers." Journal of Fluid Mechanics 770 (March 30, 2015): 124–55. http://dx.doi.org/10.1017/jfm.2015.142.

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The structure of zero-pressure-gradient compressible turbulent boundary layers is analysed using the tools of optimal transient growth theory. The approach relies on the extension to compressible flows of the theoretical framework originally developed by Reynolds & Hussain (J. Fluid Mech., vol. 52, 1972, pp. 263–288) for incompressible flows. The model is based on a density-weighted triple decomposition of the instantaneous field into the contributions of the mean flow, the organized (coherent) motions and the disorganized background turbulent fluctuations. The mean field and the eddy visc

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Tarabara, V., R. Hovinga, and M. R. Wiesner. "Transient permeate flux analysis: model validation." Water Supply 1, no. 5-6 (2001): 21–30. http://dx.doi.org/10.2166/ws.2001.0096.

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An extended model integrating several particle back-transport theories has been proposed by Sethi and Wiesner to predict transient permeate flux as a function of operational parameters for constant permeate flux (CF) and constant transmembrane pressure (CP) cross-flow regimes. Filtration experiments using monodisperse latex suspensions of particles 0.02 μm, 0.12 μm and 0.68 μm in diameter in a cross-flow flat slit membrane were carried out for model validation. In a separate set of filtration experiments with monodisperse latex particles 0.10 μm, 0.43 μm and 1.00 μm in diameter, the transient

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LUCHTENBURG, DIRK M., BERT GÜNTHER, BERND R. NOACK, RUDIBERT KING, and GILEAD TADMOR. "A generalized mean-field model of the natural and high-frequency actuated flow around a high-lift configuration." Journal of Fluid Mechanics 623 (March 6, 2009): 283–316. http://dx.doi.org/10.1017/s0022112008004965.

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A low-dimensional Galerkin model is proposed for the flow around a high-lift configuration, describing natural vortex shedding, the high-frequency actuated flow with increased lift and transients between both states. The form of the dynamical system has been derived from a generalized mean-field consideration. Steady state and transient URANS (unsteady Reynolds-averaged Navier–Stokes) simulation data are employed to derive the expansion modes and to calibrate the system parameters. The model identifies the mean field as the mediator between the high-frequency actuation and the low-frequency na

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Kovács, G., and J. R. Buchler. "The evolution to steady nonlinear pulsation in stellar models." Symposium - International Astronomical Union 123 (1988): 387–91. http://dx.doi.org/10.1017/s0074180900158413.

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The numerically generated dynamical evolution of an RR Lyrae model from different initial conditions is subjected to a time-dependent Fourier analysis, which yields the temporal behavior of the amplitudes and phases of the few longlived transient modes in addition to the ultimate winner. It is shown that the amplitude equation formalism of Buchler and Goupil gives an almost perfect fit to the observed transient behavior of the amplitudes and phases of the excited modes. Prospects and applications are discussed.

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Blinov, K. Yu, and Yu I. Blinov. "Transient and Stationary Modes in Electric Power Supplies." Russian Electrical Engineering 93, no. 3 (2022): 174–78. http://dx.doi.org/10.3103/s106837122203004x.

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Sridhar, S. "Renewal of Transient Spiral Modes in Disk Galaxies." Astrophysical Journal 884, no. 1 (2019): 3. http://dx.doi.org/10.3847/1538-4357/ab3eba.

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DeJong, Richard G. "Transient response of coupled modes in complex structures." Journal of the Acoustical Society of America 100, no. 4 (1996): 2723. http://dx.doi.org/10.1121/1.416171.

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Bazow, Dennis. "Transient oscillating modes in a relativistic expanding gas." Journal of Physics: Conference Series 832 (April 25, 2017): 012050. http://dx.doi.org/10.1088/1742-6596/832/1/012050.

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Vesipa, R., C. Camporeale, and L. Ridolfi. "Transient growths of stable modes in riverbed dynamics." EPL (Europhysics Letters) 100, no. 6 (2012): 64002. http://dx.doi.org/10.1209/0295-5075/100/64002.

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VENNELL, ROSS. "Resonance and trapping of topographic transient ocean waves generated by a moving atmospheric disturbance." Journal of Fluid Mechanics 650 (March 16, 2010): 427–42. http://dx.doi.org/10.1017/s0022112009993739.

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Proudman resonance amplifies the oceanic forced wave beneath moving atmospheric pressure disturbances. The amplification varies with water depth; consequently, the forced wave beneath a disturbance crossing topography radiates transient free waves. Transients are shown to magnify the effects of Proudman resonance for disturbances crossing the coast or shelf at particular angles. A Snell like reflection law gives rise to a type of resonance for relatively slow moving disturbances crossing a coast in an otherwise flat-bottomed ocean. This occurs for translation speeds less than the shallow water

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Irimiciuc, Stefan-Andrei, Alexandra Saviuc, Florin Tudose-Sandu-Ville, et al. "Non-Linear Behaviors of Transient Periodic Plasma Dynamics in a Multifractal Paradigm." Symmetry 12, no. 8 (2020): 1356. http://dx.doi.org/10.3390/sym12081356.

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In a multifractal paradigm of motion, nonlinear behavior of transient periodic plasmas, such as Schrodinger and hydrodynamic-type regimes, at various scale resolutions are represented. In a stationary case of Schrodinger-type regimes, the functionality of “hidden symmetry” of the group SL (2R) is implied though Riccati–Gauge different “synchronization modes” among period plasmas’ structural units. These modes, expressed in the form of period doubling, damped oscillations, quasi-periodicity, intermittences, etc., mimic the various non-linear behaviors of the transient plasma dynamics similar to

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Grebenikov, V. V., O. D. Podoltsev, R. V. Gamaliia, А. А. Tazhibaev, N. N. Arynov, and О. А. Sakhno. "COMPUTER MODELING OF TRANSIENT ELECTROMECHANICAL PROCESSES IN A WIND POWER PLANT WITH A MAGNETIC GEARBOX." Tekhnichna Elektrodynamika 2024, no. 6 (2024): 56–61. http://dx.doi.org/10.15407/techned2024.06.056.

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In this work, a computer Simulink model of a wind power plant has been developed, which uses a magnetic gearbox instead of a mechanical gearbox and also contains a synchronous permanent magnet generator. A separate Simulink model of a magnetic gearbox built on the basis of a modulated magnetic field in the air gap was developed, which al-lows to study the stability of its operation both in steady-state and transient modes. Calculations of various dynamic modes of the wind power plant’s operation were carried out, based on the developed model, such as the starting mode, an instantaneous increas

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AF, Salnikov, Bochkarev SV, and Zubko IA. "Experimental and theoretical studies of the influence of the bench elements on the transient operation of the turbine." Annals of Mathematics and Physics 6, no. 1 (2023): 029–35. http://dx.doi.org/10.17352/amp.000073.

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The energy parameters obtained during the tests of turbines of power units on the stand differ from those in the product. The research data, which results are presented in the materials of the paper, are aimed at analyzing the discrepancies between the parametric indicators of power units and bench tests of the turbines. The novelty of the obtained results reveals the direct and inverse relationship of changes in the amplitude-frequency characteristics of the elements of the stand (depending on the realized turbine power) with the obtained results of measuring the turbine power on the stand. W

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Muthiah, Gopalsamy, and Arnab Samanta. "Transient energy growth of a swirling jet with vortex breakdown." Journal of Fluid Mechanics 856 (October 2, 2018): 288–322. http://dx.doi.org/10.1017/jfm.2018.712.

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We investigate the existence of short-time, local transient growth in the helical modes of a rapidly swirling, high-speed jet that has transitioned into an axisymmetric bubble breakdown state. The time-averaged flow consisting of the bubble and its wake downstream constitute the base state, which we show to exhibit strong transient amplification owing to the non-modal behaviour of the continuous eigenspectrum. A pseudospectrum analysis mathematically identifies the so-called potential modes within this continuous spectrum and the resultant non-orthogonality between these modes and the existing

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Barbashov, Nikolay, Roman Kiselev, and Julia Strelkova. "Estimation of the efficiency of road construction machines in the design." E3S Web of Conferences 471 (2024): 06009. http://dx.doi.org/10.1051/e3sconf/202447106009.

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The reasons for the decrease in the efficiency of road construction machines are fluctuations in speed and load, deviations of which from the optimal value in terms of efficiency and causes an increase in energy losses and a decrease in efficiency. A particularly significant decrease in efficiency is observed in power units with diesel engines equipped with speed controllers that are not designed to control the efficiency of fuel consumption. The increase in energy consumption of power units with internal combustion engines in transient modes requires the creation of energy models and, based o

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Sogaro, Francesca M., Peter J. Schmid, and Aimee S. Morgans. "Thermoacoustic interplay between intrinsic thermoacoustic and acoustic modes: non-normality and high sensitivities." Journal of Fluid Mechanics 878 (September 6, 2019): 190–220. http://dx.doi.org/10.1017/jfm.2019.632.

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This study analyses the interplay between classical acoustic modes and intrinsic thermoacoustic (ITA) modes in a simple thermoacoustic system. The analysis is performed using a frequency-domain low-order network model as well as a time-domain spatially discretised model. Anti-correlated modal sensitivities are found to arise due to a pairwise interplay between acoustic and ITA modes. The magnitude of the sensitivities increases as the interplay between the modes grows stronger. The results show a global behaviour of the modes linked to the presence of exceptional points in the spectrum. The ti

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CHEN, BAO, JIAN OU, and YONG ZHANG. "TRANSIENT IMPACTING STRENGTH ANALYSIS OF MOTORCYCLE MODEL." Journal of Advanced Manufacturing Systems 07, no. 01 (2008): 75–79. http://dx.doi.org/10.1142/s0219686708001127.

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Considering the disadvantages of analysis method singleness and result differentia in the conventional structural strength analysis of motorcycle, a method concerning transient impacting strength analysis was proposed, which is based on the finite element theory. Then the bearing capacity theory was researched, and three typical operating modes under the acting of transient impacting were confirmed. Under the circumstance of MSC.PATRAN/NASTRAN software, by applying the composite structure of rod, plate and shell which has a high calculation accuracy, the element subdivision of frame is done. T

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Li, Yue, Yanghong Xia, Yini Ni, Yonggang Peng, and Qifan Feng. "Transient Stability Analysis for Grid-Forming VSCs Based on Nonlinear Decoupling Method." Sustainability 15, no. 15 (2023): 11981. http://dx.doi.org/10.3390/su151511981.

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With the increasing integration of renewable energy into the power grid, there is a growing demand for converters that not only provide stable power, but also support auxiliary functions such as grid-voltage regulation. Consequently, grid-forming strategies have attracted significant attention. However, due to the complexities of analyzing nonlinear coupling systems, a comprehensive transient stability analysis of grid-forming converters is still being explored. Conventional analysis methods rely on a simplified quasi-steady-state model for grid-forming voltage source converters (VSCs) and foc

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Chatterjee, Arun, P. Murali Reddy, Mohan M. Venigalla, and Terry L. Miller. "Operating Mode Fractions on Urban Roads Derived by Traffic Assignment." Transportation Research Record: Journal of the Transportation Research Board 1520, no. 1 (1996): 97–103. http://dx.doi.org/10.1177/0361198196152000112.

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The federal test procedure for vehicle emissions measurement treats the first 505 sec of engine operation as the transient mode. Using this definition as the basis, a special technique was developed and used to trace the elapsed time of vehicles from trip origins during the traffic assignment of zone-to-zone trips on a highway network and to determine the proportions of transient and stabilized operating modes on every link of the network. The travel models of the Sacramento (California) urban area were used to apply this technique and derive operating mode fractions for this urban area. The d

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Appleby, Peter A., Saqib Shabir, Jennifer Southgate, and Dawn Walker. "Cell-type-specific modelling of intracellular calcium signalling: a urothelial cell model." Journal of The Royal Society Interface 10, no. 86 (2013): 20130487. http://dx.doi.org/10.1098/rsif.2013.0487.

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Calcium signalling plays a central role in regulating a wide variety of cell processes. A number of calcium signalling models exist in the literature that are capable of reproducing a variety of experimentally observed calcium transients. These models have been used to examine in more detail the mechanisms underlying calcium transients, but very rarely has a model been directly linked to a particular cell type and experimentally verified. It is important to show that this can be achieved within the general theoretical framework adopted by these models. Here, we develop a framework designed spe

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Fayzulla, Axunov. "MATHEMATICAL MODEL FOR CALCULATING TRANSIENT AND STEADY MODES OF A VALVE CONVERTER." International Journal of Education, Social Science & Humanities. FARS Publishers 11, no. 1 (2023): 872–79. https://doi.org/10.5281/zenodo.7577654.

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The article presents the results of a study of an information-mathematical model for calculating transient and steady-state modes of a valve converter, which will make it possible to effectively use computing systems in solving problems of analysis and optimal selection of elements of a given class of valve converter.

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Venelin, Stoyanov Jivkov. "Transient modes of high-speed rotor whit electric drive." Global Journal of Engineering and Technology Advances 13, no. 3 (2022): 008–21. https://doi.org/10.5281/zenodo.7680166.

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The paper presents the results of the study of the transient modes of a high-speed rotor with formally six degree of freedom, driven by an electric motor-generator during transition trough the resonance. Based on the Newton-Euler equation, the differential equations of motion are derived, and the frequency spectrum of the considered electro-mechanical system is determined. The following cases are considered: - transition trough resonance with unlimited (ideal energy source) and limited excitation by the motor; unstable frequency zones; phase trajectories and the influence of the electro-magnet

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NICHOLS, JOSEPH W., and SANJIVA K. LELE. "Global modes and transient response of a cold supersonic jet." Journal of Fluid Mechanics 669 (January 31, 2011): 225–41. http://dx.doi.org/10.1017/s0022112010005380.

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Global-mode analysis is applied to a cold, M = 2.5 laminar jet. Global modes of the non-parallel jet capture directly both near-field dynamics and far-field acoustics which, in this case, are coupled by Mach wave radiation. In addition to type (a) modes corresponding to Kelvin–Helmholtz instability, it is found that the jet also supports upstream-propagating type (b) modes which could not be resolved by previous analyses of the parabolized stability equations. The locally neutrally propagating part of a type (a) mode consists of the growth and decay of an aerodynamic wavepacket attached to the

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Zhang, Hao, Weijie Li, Honghui Ding, Pengcheng Luo, Xiaojin Wan, and Wanbo Hu. "Nonlinear Modal Analysis of Transient Behavior in Cascade DC–DC Boost Converters." International Journal of Bifurcation and Chaos 27, no. 09 (2017): 1750140. http://dx.doi.org/10.1142/s0218127417501401.

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This paper deals with the transient characteristics of the cascade DC–DC Boost converter under a large disturbance by using nonlinear modal series method. Based on the power balance principle, a nonlinear averaged model is derived to describe the nonlinear dynamics of the cascade converter. And then, the modal series method is described in detail and the second order approximate solutions are derived by this method. Furthermore, the simulation results and the theoretical analysis demonstrate that there are plenty of modal interactions, particularly the stronger second order modal interactions,

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Lipkin, V. M., M. S. Lipkin та V. I. Lachin. "The Mechanism of Water-Soluble Polymer Аdditives and Parameters of the Pulse Electrolysis Effect on the Size Distribution of the Electrolytic Copper Powder". Materials Science Forum 870 (вересень 2016): 636–41. http://dx.doi.org/10.4028/www.scientific.net/msf.870.636.

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The principles of pulse electrolysis modes selection and their effect on the size distribution of the powder electrolytic copper in electrolyte with additions of water-soluble polymers, polyvinylpyrrolidone (PVP) and polyacrylamide (PAA) are considered in the paper. The research conducted with use of chronopotentiometry and potential transients as well as a simulation model of the electrocrystallisation process showed that the values of pulse duration were greater than the transient time of electroactive species and the pause duration equal to the linear part of potential transient was optimum

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V., L. HOROBETS, H. MASLEIEVA L., V. URSULIAK L., and V.ARSONOV V. "ABOUT THE EVALUATION OF THE LONGITUDINAL FORCES LEVEL EFFECTING THE TRACK DISPLACEMENT AT TRANSIENT MODES OF TRAIN MOVEMENT." Science and Transport Progress, no. 2(56) (April 29, 2015): 207–21. https://doi.org/10.15802/stp2015/42179.

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<strong>Purpose</strong>. Study the transient modes effect of movement on the track displacement for the freight train safety control is supposed in this paper. For this it is necessary to investigate the longitudinal dynamics of a train on the track displacement. Simultaneously to assess the longitudinal forces level of a track and rolling stock interaction.<strong> Methodology</strong>. The level of the longitudinal forces, effecting the track displacement, was evaluated using mathematical modeling of longitudinal vibrations of the trains at transient modes of motion caused by braking.

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Vladov, Serhii, Arkadiusz Banasik, Anatoliy Sachenko, et al. "Intelligent Method of Identifying the Nonlinear Dynamic Model for Helicopter Turboshaft Engines." Sensors 24, no. 19 (2024): 6488. http://dx.doi.org/10.3390/s24196488.

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This research focused on the helicopter turboshaft engine dynamic model, identifying task solving in unsteady and transient modes (engine starting and acceleration) based on sensor data. It is known that about 85% of helicopter turboshaft engines operate in steady-state modes, while only around 15% operate in unsteady and transient modes. Therefore, developing dynamic multi-mode models that account for engine behavior during these modes is a critical scientific and practical task. The dynamic model for starting and acceleration modes has been further developed using on-board parameters recorde

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Ferreira, David, and Claude Frankignoul. "The Transient Atmospheric Response to Midlatitude SST Anomalies." Journal of Climate 18, no. 7 (2005): 1049–67. http://dx.doi.org/10.1175/jcli-3313.1.

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Abstract To study the transient atmospheric response to midlatitude SST anomalies, a three-layer quasigeostrophic (QG) model coupled to a slab oceanic mixed layer in the North Atlantic is used. As diagnosed from a coupled run in perpetual winter conditions, the first two modes of SST variability are linked to the model North Atlantic Oscillation (NAO) and eastern Atlantic pattern (EAP), respectively, the dominant atmospheric modes in the Atlantic sector. The two SST anomaly patterns are then prescribed as fixed anomalous boundary conditions for the model atmosphere, and its transient responses

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