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Journal articles on the topic 'Lumped parameter method'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Tindale, A. "Third-order lumped-parameter simulation method." Building Services Engineering Research and Technology 14, no. 3 (1993): 87–97. http://dx.doi.org/10.1177/014362449301400302.

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2

Zhang, Yongtao, Shijie Yu, Changhou Lu, Haixia Zhao, and Peng Liang. "An improved lumped parameter method for calculating static characteristics of multi-recess hydrostatic journal bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 2 (2019): 301–10. http://dx.doi.org/10.1177/1350650119855242.

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This paper proposes an improved lumped parameter method for calculating the static characteristics of multi-recess hydrostatic journal bearings. The improved lumped parameter method can estimate the total pressure distribution in the circumferential direction by introducing control volume in the middle of each inter-recess land, and utilizing the flow continuity equations for each recess and each control volume with the assumption that the pressure distributions are parabolic on the inter-recess land. Then the recess pressure and the fluid film force can be calculated. The calculation accuracy

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3

Seto, Kazuto, Mingzhang Ren, and Fumio Doi. "Modeling and Feedback Structural Acoustics Control of a Flexible Plate." Journal of Vibration and Acoustics 123, no. 1 (2000): 18–23. http://dx.doi.org/10.1115/1.1285987.

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A lumping method via an inverse modal analysis approach is proposed in this paper for creating a lumped parameter model for a structure with distributed parameters. On the basis of the lumped parameter model, the formulation of an optimal controller in physical state space is presented and, furthermore, the design of a reduced-order controller is described. The method is demonstrated and verified by the vibration and noise control experiments carried out on a clamped plate. Several modes of the plate with high sound radiating efficiencies are well controlled by using three sensors and one actu

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Arathi, Sudarshan, and B.K Ananda. "MATHEMATICAL MODELING OF CARDIAC CYCLE USING LUMPED PARAMETER METHOD." International Journal of Education &Applied Sciences Research 1, no. 4 (2014): 38–58. https://doi.org/10.5281/zenodo.10683601.

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<strong>Abstract:</strong> <em>                             This work reviews the main aspects of cardiovascular system dynamics with an emphasis on modeling hemodynamic characteristics by the use of a lumped parameter approach. This model describes relationships between flow rate and pressure using electric circuit models based on analogy between blood flow and pressure of the cardiovascular system and the current and voltage in an electrical circuit syst

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5

Kast, Joshua, and Atef Elsherbeni. "Finite-Difference Time-Domain Simulation of Arbitrary Impedance using One Port S-Parameter." Applied Computational Electromagnetics Society 35, no. 9 (2020): 985–91. http://dx.doi.org/10.47037/2020.aces.j.350902.

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Many modern radio-frequency devices comprise both lumped-element components and complex geometries. Simulation of such a device requires modeling the electromagnetic interactions with both geometric features and lumped components. We present a method for including arbitrary lumped-element components into finite-difference time-domain (FDTD) simulations. The lumped-element components, which are described by their scattering parameters, are modeled in the Yee grid as dependent voltage sources. The mathematical formulation is described, along with its implementation into a FDTD simulator. For ver

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6

Gu, Xiang Hong, Yong Mao Shang, and Hai Yang Bi. "Infinite Cylinder Lumped Parameter Analysis Method of Unsteady-State Conduction." Applied Mechanics and Materials 741 (March 2015): 449–52. http://dx.doi.org/10.4028/www.scientific.net/amm.741.449.

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The paper extends the traditional lumped parameter analysis method of unsteady-state. Under the convection boundary 0<Bi<∞, a mean temperature lumped parameter analysis method is studied and the mean temperature response formula has been established. Taking an infinite cylinder as an example, the paper presents the regular pattern of the transient mean temperature value and discusses the numerical analysis. The method for solving the unsteady-state conduction in the paper is more convenient and practical than the M.P. Heisler charts that had been used in textbooks of native and foreign c

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Li, Bin, Liang Yan, and Wenping Cao. "An Improved LPTN Method for Determining the Maximum Winding Temperature of a U-Core Motor." Energies 13, no. 7 (2020): 1566. http://dx.doi.org/10.3390/en13071566.

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In a traditional lumped-parameter thermal network, no distinction is made between the heat and non-heat sources, resulting in both larger heat flux and temperature drop in the uniform heat source. In this paper, an improved lumped-parameter thermal network is proposed to deal with such problems. The innovative aspect of this proposed method is that it considers the influence of heat flux change in the heat source, and then gives a half-resistance theory for the heat source to achieve the temperature drop balance. In addition, the coupling relationship between the boundary temperature and loadi

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8

Orlikowski, Cezary, and Rafał Hein. "Port-Based Modeling of Distributed-Lumped Parameter Systems." Solid State Phenomena 164 (June 2010): 183–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.183.

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This paper presents a uniform, port-based approach for modeling of both lumped and distributed parameter systems. Port-based model of the distributed system has been defined by application of bond graph methodology and distributed transfer function method (DTFM). The proposed approach combines versatility of port-based modeling and accuracy of distributed transfer function method. A concise representation of lumped-distributed systems has been obtained. The proposed method of modeling enables to formulate input data for computer analysis by application of DTFM.

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9

Roemer, Daniel Beck, Per Johansen, Henrik C. Pedersen, and Torben O. Andersen. "Method for Lumped Parameter Simulation of Digital Displacement Pumps/Motors Based on CFD." Applied Mechanics and Materials 397-400 (September 2013): 615–20. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.615.

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Digital displacement fluid power pumps/motors offers improved efficiency and performance compared to traditional variable displacement pump/motors. These improvements are made possible by using efficient electronically controlled seat valves and careful design of the flow geometry. To optimize the design and control of digital displacement machines, there is a need for simulation models, preferably models with low computational cost. Therefore, a low computational cost generic lumped parameter model of digital displacement machine is presented, including a method for determining the needed mod

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10

Underwood, C. P. "An improved lumped parameter method for building thermal modelling." Energy and Buildings 79 (August 2014): 191–201. http://dx.doi.org/10.1016/j.enbuild.2014.05.001.

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11

Wu, Chang, Yu Zeng, Hai Sun, and Gang Yang. "Rotating heat pipe model based on lumped parameter method." Journal of Physics: Conference Series 2764, no. 1 (2024): 012047. http://dx.doi.org/10.1088/1742-6596/2764/1/012047.

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Abstract On the basis of many theoretical studies about rotating heat pipes, a simplified mathematical model is established based on the lumped parameter method, ignoring the temperature difference inside each section of the heat pipe is ignored, and comparing the calculated results with the experimental data. It is identified that this model has a good applicability at high speeds and low liquid filling rates, and effectively reduces the amount of calculation, which is of practical significance to the engineering application of rotating heat pipes.

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12

U¨nlu¨soy, Y. Samim, and S. Turgut Tu¨mer. "Analytical Dynamic Response of Elastic Cam-Follower Systems with Distributed Parameter Return Spring." Journal of Mechanical Design 115, no. 3 (1993): 612–20. http://dx.doi.org/10.1115/1.2919234.

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An analytical method of solution for the high-speed dynamic response of a lumped/distributed parameter model for cam-follower systems is developed. The model combines the distributed parameter model of the return spring with a viscously damped, single degree-of-freedom, lumped model of the elastic follower train. The cam event is considered as a periodic motion, of period 360 deg, and is represented by its Fourier series approximation. Linear systems approach utilizing four-pole parameter representation of lumped and distributed elements is adopted. The applicability and the accuracy of the me

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13

Cao, Chang, Xingxing Feng, and Min Liu. "A coupled radial-torsional lumped parameter model of rubber bushing for multibody dynamic simulations." MATEC Web of Conferences 382 (2023): 01023. http://dx.doi.org/10.1051/matecconf/202338201023.

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Many constitutive models’ finite element (FE) models and lumped parameter models included have been presented for rubber bushings. In general, the FE models cannot be directly used in mechanical multibody systems with bushings, and the lumped parameter models can not consider the coupled modes of deformation of bushings. For this reason, a two-dimensional lumped parameter model for rubber bushings is presented, which considers the coupled radial-torsional deformation and can be easily implemented into mechanical multibody systems. FE method is used to simulate the rubber bushing subjected to a

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14

Shahood, Ahmed* Jitendra Jayant. "IMPROVING CLASSICAL LUMPED MODEL FOR TRANSIENT HEAT CONDUCTION IN SLAB USING HERMITE APPROXIMATION." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 6 (2017): 84——93. https://doi.org/10.5281/zenodo.802834.

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The present work aims at applying the ideas on the analysis of improved lumped-parameter model for transient heat conduction in a slab with temperature-dependent thermal conductivity. The transient temperature is found to depend on various model parameters, namely, Biot number, heat source parameter and time. Polynomial Approximation Method (PAM) has been possible to derive a unified relation for the transient thermal behaviour of solid (slab and tube) with both internal generation and boundary heat flux. In all the cases, a closed form solution is obtained between temperature, Biot number, he

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15

Wang, Hai, Wei Qing Liu, Shu Guang Wang, Dong Sheng Du, and Ding Zhou. "Study on Lumped-Parameter Model of Surface Circular Foundation." Advanced Materials Research 261-263 (May 2011): 980–84. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.980.

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This paper puts attention on the application of Chebyshev complex polynomials in the development of lumped-parameter model of surface circular foundation. The present method is an important extension to the concept of polynomial-fraction approximation in the foundation modeling. In the present analysis, the normalized flexibility function is adopted to improve the accuracy of the model and to reduce the parameters in modeling. The accuracy and validity of the lumped-parameter model is extensively investigated for the case of surface circular foundation. The proposed method may be easily applie

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16

Li, Bao, Wenxin Wang, Boyan Mao, and Youjun Liu. "A Method to Personalize the Lumped Parameter Model of Coronary Artery." International Journal of Computational Methods 16, no. 03 (2019): 1842004. http://dx.doi.org/10.1142/s0219876218420045.

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A method which can personalize the lumped parameter model of coronary artery and cardiovascular system based on the non-invasive physiological parameters has been developed. The parameters of system were determined by different physiological parameters. The heart module was determined by aortic pressure and heart rate; the systemic circulation module was determined by cardiac output, height and cardio-ankle vascular index (CAVI), while the CAVI was determined by age and aortic pressure; the coronary module was determined by the target waveforms of coronary flow rate predicted from cardiac outp

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17

Deng, Shanshan, Feng Li, Hao Luo, et al. "Lumped Parameter Modeling of SAE J2601 Hydrogen Fueling Tests." Sustainability 15, no. 2 (2023): 1448. http://dx.doi.org/10.3390/su15021448.

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The safety of hydrogen storage is essential for the development of fuel cell vehicles. A mathematical model for a compressed hydrogen storage tank is established based on the mass conservation equation, the energy conservation equation and the real gas equation of state. Using the Matlab/Simulink platform, a dual-zone lumped parameter model, which divides the tank into a hydrogen gas zone and a tank wall zone, is established. The initial conditions of the MC Default method hydrogen filling from SAE J2601 are utilized in the lumped parameter model for numerical simulation. Five cases are studie

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18

Li, Lin. "Study of the Lumped Parameter Models and Parameters Identification of Hydraulic Bushing." Applied Mechanics and Materials 321-324 (June 2013): 1805–11. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.1805.

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This article proposes two types of Lumped parameter models for the hydraulic bushing. Digital computation method is used to estimate the system parameters of LP model, provides a new way to reduce development cycle of hydro bushing. Two results of hydro-bushing dynamic behavior using two LP models are compared and analyzed. This article provides more channel to analyze the operation principle of the hydraulic bushing.

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19

Chen, C. F., and C. H. Hsiao. "Haar wavelet method for solving lumped and distributed-parameter systems." IEE Proceedings - Control Theory and Applications 144, no. 1 (1997): 87–94. http://dx.doi.org/10.1049/ip-cta:19970702.

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20

Liu, Dong, Xiaoting Xiao, Ziqiao Tang, et al. "Method for QCM Resonator Device Equivalent Circuit Parameter Extraction and Electrode Quality Assessment." Micromachines 12, no. 9 (2021): 1086. http://dx.doi.org/10.3390/mi12091086.

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Quartz crystal microbalance (QCM) resonators are used in a wide range of sensors. Current QCM resonators achieve a simultaneous measurement of multiple physical quantities by analyzing lumped-element equivalent parameters, which are obtained via the introduction of external devices. This introduction of external devices will probably increase measurement error. To realize the measurement of multiple physical quantities while eliminating the measurement error caused by external devices, this paper proposes a measurement method for the lumped-element equivalent parameters of QCM resonators witho

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21

Chen, Yukai, Xin Yang, Mingzhi Yang, Yanfei Wei, and Haobin Zheng. "Characterization of Giant Magnetostrictive Materials Using Three Complex Material Parameters by Particle Swarm Optimization." Micromachines 12, no. 11 (2021): 1416. http://dx.doi.org/10.3390/mi12111416.

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Complex material parameters that can represent the losses of giant magnetostrictive materials (GMMs) are the key parameters for high-power transducer design and performance analysis. Since the GMMs work under pre-stress conditions and their performance is highly sensitive to pre-stress, the complex parameters of a GMM are preferably characterized in a specific pre-stress condition. In this study, an optimized characterization method for GMMs is proposed using three complex material parameters. Firstly, a lumped parameter model is improved for a longitudinal transducer by incorporating three ma

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22

Yang, B. "Distributed Transfer Function Analysis of Complex Distributed Parameter Systems." Journal of Applied Mechanics 61, no. 1 (1994): 84–92. http://dx.doi.org/10.1115/1.2901426.

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This paper presents a new analytical and numerical method for modeling and synthesis of complex distributed parameter systems that are multiple continua combined with lumped parameter systems. In the analysis, the complex distributed parameter system is first divided into a number of subsystems; the distributed transfer functions of each subsystem are determined in exact and closed form by a state space technique. The complex distributed parameter system is then assembled by imposing displacement compatibility and force balance at the nodes where the subsystems are interconnected. With the dis

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23

Xu, Chuanzhong, Ying Liang, Xiaofang Sun, Gongyi Huang, and Fei Yu. "A Noniterative Parameter-Extraction Method for Single-Diode Lumped Parameter Model of Solar Cells." IEEE Transactions on Electron Devices 68, no. 9 (2021): 4529–35. http://dx.doi.org/10.1109/ted.2021.3099088.

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24

Shim, Eun Bo, Jong Youb Sah, and Chan Hyun Youn. "Mathematical Modeling of Cardiovascular System Dynamics Using a Lumped Parameter Method." Japanese Journal of Physiology 54, no. 6 (2004): 545–53. http://dx.doi.org/10.2170/jjphysiol.54.545.

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25

Khajiyeva, Lelya A., Igor V. Andrianov, Yuliya F. Sabirova, and Askar K. Kudaibergenov. "Analysis of Drill-String Nonlinear Dynamics Using the Lumped-Parameter Method." Symmetry 14, no. 7 (2022): 1495. http://dx.doi.org/10.3390/sym14071495.

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This work aims at studying the nonlinear dynamics of drill strings using the lumped-parameter method (LPM). The study is based on the good consistency of the results of the test problem where the model of the longitudinal vibrations of a horizontal drill string with a static compressive load at the left end is considered. In this paper, this method is applied to discretize linear and nonlinear models of the lateral vibrations of a vertical drill string under the effect of a supersonic gas flow. The obtained results are verified with the previously published data. The optimal number of the dril

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26

Li, Shaoping, Jyh Sheen, Sei-Joo Jang, Amar S. Bhalla, Robert E. Newnham, and L. Eric Cross. "Modified Lumped Parameter Method for Measurements of Dielectric Susceptibility in Ferroelectrics." Japanese Journal of Applied Physics 33, Part 1, No. 6A (1994): 3617–21. http://dx.doi.org/10.1143/jjap.33.3617.

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27

Chow, J. H., Z. W. Zhong, W. Lin, and L. P. Khoo. "An investigation of thermal contact conductance using the lumped parameter method." International Journal of Thermal Sciences 60 (October 2012): 114–21. http://dx.doi.org/10.1016/j.ijthermalsci.2012.05.014.

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28

Colvin, Douglas. "Computationally Efficient Method of Calculations Involving Lumped-Parameter Transmission-Line Models." IEEE Transactions on Electromagnetic Compatibility EMC-27, no. 1 (1985): 41–43. http://dx.doi.org/10.1109/temc.1985.304244.

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29

Oner, Yasemin, and İbrahim Şenol. "Lumped parameter method of permanent magnet synchronous generator for wind energy." Electrical Engineering 98, no. 2 (2015): 169–77. http://dx.doi.org/10.1007/s00202-015-0354-1.

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30

Sun, Jiamian, Haiwang Li, Sifan Wu, et al. "Broadband Lumped-Element Parameter Extraction Method of Two-Port 3D MEMS In-Chip Solenoid Inductors Based on a Physics-Based Equivalent Circuit Model." Micromachines 11, no. 9 (2020): 836. http://dx.doi.org/10.3390/mi11090836.

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Integrated 2D spiral inductors possess low inductance per unit area, which limits their application range. However, the state of investigation into the lumped-element parameter extraction method for integrated 3D in-chip multi-turn solenoid inductors, which possess higher inductance per unit area, is inadequate. This type of inductor can thus not be incorporated into fast computer-aided design (CAD)-assisted circuit design. In this study, we propose a broadband two-port physics-based equivalent circuit model for 3D microelectromechanical system (MEMS) in-chip solenoid inductors that are embedd

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31

Bellos, J., and D. J. Inman. "Frequency Response of Nonproportionally Damped, Lumped Parameter, Linear Dynamic Systems." Journal of Vibration and Acoustics 112, no. 2 (1990): 194–201. http://dx.doi.org/10.1115/1.2930112.

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The frequency response of nonproportionally (or nonclassically or non-Raleigh) damped linear lumped mass systems is discussed here. The exact method, via Laplace transforms, is presented and the practical difficulties revealing the necessity of approximate methods are emphasized. Modal analysis is used to transform the governing equations of motion to the respective modal coupled equations of motion. The Laplace transform is performed to transfer to the frequency domain. The modal coupling is then analyzed through coupling terms. A criterion in the form of nonproportionality indices is develop

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32

Nielsen, Daniel Gert, Peter Risby Andersen, Jakob Søndergaard Jensen, and Finn Thomas Agerkvist. "Estimation of Optimal Values for Lumped Elements in a Finite Element — Lumped Parameter Model of a Loudspeaker." Journal of Theoretical and Computational Acoustics 28, no. 02 (2020): 2050012. http://dx.doi.org/10.1142/s2591728520500127.

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Finite element methods are progressively being utilized to assist in the continuous development of loudspeakers. The core of this paper is the method of lumping certain parts of the finite element model, creating a significant reduction in the model complexity that allows for e.g. faster structural optimization. This is illustrated in the paper with a loudspeaker example where the electromagnetic parts are lumped as well as the spider. It is shown that the simplified model still matches the complex response of the full FE model at very high frequencies.

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33

Totaro, G., B. Zardin, M. Borghi, and F. Scolari. "Modelling of a Gerotor pump including the evaluation of the micro-movements of the external gear." Journal of Physics: Conference Series 2648, no. 1 (2023): 012049. http://dx.doi.org/10.1088/1742-6596/2648/1/012049.

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Abstract Gerotor pumps are positive displacement pumps used in many applications thanks to their compact size and low cost. On the other side the efficiency of the machine is not so brilliant. In order to study design modifications to decrease energy consumption, a lumped parameter model is a useful tool since it allows predicting and enhancing pump performance. This type of model can be used, once complete, to analyse various phenomena such as cavitation, the chambers’ pressure transient, the flow and pressure ripple, the leakages, and the noise emissions. This work presents a lumped paramete

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34

Lee, Gi-Young, Min-Shin Cho, and Rae-Young Kim. "Lumped Parameter Modeling Based Power Loop Analysis Technique of Power Circuit Board with Wide Conduction Area for WBG Semiconductors." Electronics 10, no. 14 (2021): 1722. http://dx.doi.org/10.3390/electronics10141722.

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With the development of wide-bandgap (WBG) power semiconductor technology, such as silicon carbide (SiC) and gallium nitride (GaN), the technology of power converters with high efficiency and high-power density is rapidly developing. However, due to the high rate-of-rise of voltage (dv/dt) and of current (di/dt), compared to conventional Si-based power semiconductor devices, the reliability of the device is greatly affected by the parasitic inductance component in the switching loop. In this paper, we propose a power loop analysis method based on lumped parameter modeling of a power circuit bo

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35

Liu, Gang, Bing Yang Huang, and Zhi Gang Hua. "Research on Whirling Vibration of CPP Propulsion Shafting." Advanced Materials Research 308-310 (August 2011): 2537–42. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2537.

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The parameters influencing the whirling vibration characteristic is more for the CPP (Controllable-Pitch Propeller) propulsion shafting, comparing to the traditional shafting. Verified by a ship’s CPP propulsion shafting, the method of transfer matrices is used for analyzing whirling vibration, by building a hybrid model fosr lumped parameter elements and distributed parameter elements. Then the parameters influencing the whirling vibration characteristic are analyzed, which could provide evidence for the analysis on the whirling vibration for the CPP propulsion shafting.

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36

Xu, Jianing, Chuanyu Sun, Yulong Ni, et al. "Fast Identification of Micro-Health Parameters for Retired Batteries Based on a Simplified P2D Model by Using Padé Approximation." Batteries 9, no. 1 (2023): 64. http://dx.doi.org/10.3390/batteries9010064.

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Better performance consistency of regrouped batteries retired from electric vehicles can guarantee the residual value maximized, which greatly improves the second-use application economy of retired batteries. This paper develops a fast identification approach for micro-health parameters characterizing negative electrode material and electrolyte in LiFePO4 batteries on the basis of a simplified pseudo two-dimensional model by using Padé approximation is developed. First, as the basis for accurately identifying micro-health parameters, the liquid-phase and solid-phase diffusion processes of pseu

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Tiwari, Nachiketa, Amrita Puri, and Abhishek Saraswat. "Lumped parameter modelling and methodology for extraction of model parameters for an electrodynamic shaker." Journal of Low Frequency Noise, Vibration and Active Control 36, no. 2 (2017): 99–115. http://dx.doi.org/10.1177/0263092317693511.

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Shakers are widely used to simulate the vibrations for academic research, as well as for product testing. Thus, there is a significant necessity to study them in detail. Amongst the different types of shakers being used, the electrodynamic shaker is by far the most versatile. However, limited work has been done with regard to their integrated electro-mechanical modelling. In this work, we have developed a mobility-based lumped parameter model of an electrodynamic shaker and also a method to measure its various electrical and mechanical parameters using non-destructive and easy to use methods.

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38

Orlikowski, Cezary, and Rafał Hein. "Modelling of Geared Multi-Rotor System." Solid State Phenomena 198 (March 2013): 669–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.198.669.

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In this paper the method of modelling a speed-varying geared rotor system is presented. The proposed approach enables us to obtain an accurate low-order lumped parameter representation of the investigated system. The final model consists of reduced modal models of an undamped beam/torsional shaft system as well as a spatially lumped model of other linear and nonlinear phenomena including gear mesh interaction.

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39

Ortiz-Conde, Adelmo, Francisco García-Sánchez, Juan Muci, and Andrea Sucre-González. "A review of diode and solar cell equivalent circuit model lumped parameter extraction procedures." Facta universitatis - series: Electronics and Energetics 27, no. 1 (2014): 57–102. http://dx.doi.org/10.2298/fuee1401057o.

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This article presents an up-to-date review of several methods used for extraction of diode and solar cell model parameters. In order to facilitate the choice of the most appropriate method for the given particular application, the methods are classified according to their lumped parameter equivalent circuit model: single-exponential, double-exponential, multiple-exponential, with and without series and parallel resistances. In general, methods based on numerical integration or optimization are recommended to reduce the possible uncertainties arising from measurement noise.

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40

Wang, Y., and R. L. Huston. "A lumped parameter method in the nonlinear analysis of flexible multibody systems." Computers & Structures 50, no. 3 (1994): 421–32. http://dx.doi.org/10.1016/0045-7949(94)90011-6.

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41

Gao, Gui Ge, and Xian Wen Zeng. "Variable Structure Control Based Wavelet Transforms for Linear Time-Invariant Distributed Parameter Systems." Advanced Materials Research 482-484 (February 2012): 1809–15. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1809.

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The distributed parameter systems(DPS) are usually described by the partial differential equations(PDEs). Compared the variable structure control problem of DPS with that of the lumped parameter systems(LPS) , it is more complicated because the problem of variable structure control for DPS is often closely related to the theory of the differential operator or integral operator. Based on Haar wavelets transform, the operational matrixes and their characteristics, this paper attempts to propose a new approach for the variable structure control problem of a class linear time-invariant DPS by conv

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42

Long, A. J. "RRAWFLOW: Rainfall-Response Aquifer and Watershed Flow Model (v1.11)." Geoscientific Model Development Discussions 7, no. 5 (2014): 5919–63. http://dx.doi.org/10.5194/gmdd-7-5919-2014.

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Abstract. The Rainfall-Response Aquifer and Watershed Flow Model (RRAWFLOW) is a lumped-parameter model that simulates streamflow, springflow, groundwater level, solute transport, or cave drip for a measurement point in response to a system input of precipitation, recharge, or solute injection. The RRAWFLOW open-source code is written in the R language and is included in the Supplement to this article along with an example model of springflow. RRAWFLOW includes a time-series process to estimate recharge from precipitation and simulates the response to recharge by convolution; i.e., the unit hy

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43

Liangsheng, Wu. "Direct Method of Inverse Eigenvalue Problems for Structure Redesign*." Journal of Mechanical Design 125, no. 4 (2003): 845–47. http://dx.doi.org/10.1115/1.1631575.

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This paper studies an inverse design problem of a general eigenvalue of a dynamic system where the elements of the rigidity and mass matrices are linear with respect to a design vector b. The coefficients of spring and mass of a lumped parameters structure, the length and width, the radius, etc play the role of design parameters. For some specified eigenvalues and eigenvectors, the design parameter vector can be obtained and the rigidity and mass matrices of an initially designed structure can be reconstructed by solving linear algebra equations. The theory and method can not only be used for

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Tao, Ruyi, Shenshen Cheng, Xinggan Lu, Shao Xue, and Xiaoting Cui. "The Application of the Particle Element Method in Tubular Propellant Charge Structure: Lumped Element Method and Multiple-Element Method." Energies 17, no. 17 (2024): 4384. http://dx.doi.org/10.3390/en17174384.

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Due to the orderly arrangement of tubular propellant, the permeability of combustion gases is improved, which is beneficial for enhancing the safety of the combustion system. However, current internal ballistic gas-solid flow calculation methods adopt a quasi-fluid assumption, which cannot accurately account for the characteristics of long tube shapes. Additionally, tubular propellants exhibit both overall movement and parameter distribution characteristics, necessitating the decoupling of gas and solid phases. These two deficiencies in previous studies have limited the effectiveness of gas-so

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Rong, Hai, and Kai Zhou. "Nonlinear zero-bias current control for active magnetic bearing in power magnetically levitated spindle based on adaptive backstepping sliding mode approach." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 20 (2016): 3753–65. http://dx.doi.org/10.1177/0954406216652172.

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The zero-bias current controlled way is proposed to cut down the power consumption of the active magnetic bearing in a power magnetically levitated spindle system. The zero-bias current controlled way is easier to realize than the zero-bias flux controlled way, since current can be detected directly, while flux is hard to be measured in practice. Besides, the active magnetic bearing suffers from lumped uncertainty including parameter uncertainty and external load, and the displacement of rotor caused by lumped uncertainty is undesirable. In practice, the upper bound of the lumped uncertainty e

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Liu, Jiashuai, Xi Wang, Xitong Pei, et al. "Generic Modeling Method of Quasi-One-Dimensional Flow for Aeropropulsion System Test Facility." Symmetry 14, no. 6 (2022): 1161. http://dx.doi.org/10.3390/sym14061161.

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To support the advanced controller design and verification of the Aeropropulsion System Test Facility (ASTF), it is necessary to establish a mathematical model of ASTF with high precision and replace the current lumped parameter model. Therefore, a quasi-one-dimensional flow model of ASTF is established considering friction, localized losses, heat transfer, etc. Moreover, a generic modeling method is proposed for quasi-one-dimensional flow. With this method, all component models of ASTF are composed of staggered central control volume (CCV) and boundary control volume (BCV) and connected throu

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Kang, Ying Wei, Yang Xue, Wei Huang, and Yi Fan Li. "A Nonlinear Lumped-Parameter Dynamic Model of Power Plant Boiler Superheater." Advanced Materials Research 732-733 (August 2013): 57–62. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.57.

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Traditional models of power plant boiler superheater are incapable of simulating the operating conditions under large disturbances with high precision. To resolve this challenging problem, this paper presents a nonlinear lumped-parameter dynamic model of power plant boiler superheater. The present model describes the dynamic processes of the pressure-flowrate and the enthalpy-temperature channels with sufficient consideration of their coupling effect. To better capture the distributed-parameter property of superheater temperature, the multi-segment lumped-parameter modeling method is employed

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Nguyen, Manh-Dung, Jong-Hyeon Woo, Hyo-Seob Shin, et al. "Thermal analysis and experimental verification of permanent magnet synchronous motor by combining lumped-parameter thermal networks with analytical method." AIP Advances 13, no. 2 (2023): 025140. http://dx.doi.org/10.1063/9.0000464.

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This study presents an approach to calculating the temperature increase in the internal components of permanent magnet synchronous machines by applying lumped-parameter thermal networks and analytical methods. Accordingly, the thermal equivalent circuit method is employed to obtain the temperatures of the machine’s internal components. Furthermore, this analytical method predicts the temperature distribution in the slot area. The 24/6 prototype was used to evaluate the proposed model by comparing the calculated and finite element method simulation.

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Wang, Zhuoya, Liangliang Hao, and Zemin Wang. "Short-Circuit Current Calculation of Flexible Direct Current Transmission Lines Considering Line Distribution Parameters." Energies 17, no. 15 (2024): 3800. http://dx.doi.org/10.3390/en17153800.

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A fault on the DC side of a flexible HVDC system, along with the rise in short-circuit current, develops rapidly. With the gradual expansion of flexible HVDC technology to large capacities and long-distance transmission and offshore transmission scenarios, the problem of short-circuit current calculation considering the characteristics of line distribution parameters needs urgent attention. Therefore, in order to solve the problem of the inaccurate calculation of the short-circuit current on the DC side, the lumped parameter model is used in a flexible DC system for long-distance transmission.

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Yu, Li Juan, Zhao Jun Yang, and Fu You Liu. "The Bending Vibration Analysis on the Main Drive Axis of CNC Spiral Bevel Gear Milling Machine." Advanced Materials Research 655-657 (January 2013): 1296–99. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.1296.

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Gear machine tool main drive shaft to avoid resonance problem is studied.The force of the drive shaft is analyzed, and the vibration form of the drive shaft is confirmed. Using the lumped parameter method to simplify the main drive shaft, the lumped mass model and the force model were been obtained. When bending vibrating, the natural frequency of the main drive shaft is calculated using the transfer matrix method. The calculated critical speed is 43755r/min, which far outweighs the motor rated speed .It means that the drive shaft under normal work won't be resonance, which accords with the re

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