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21st International Conference on Complex Systems - Control and Modeling Problems (CSCMP)

作者： Nechaev, Alexandr Moshchenskij, Yurij Samara State Tech Univ Samara Russia

ISBN: (纸本)9781728167008

Modern differential scanning calorimeter (DSC) is a complex information-measuring system used to obtain different temperature and thermal characteristics of the investigated substances. The main subsystem of DSC is a heat block including heaters, measuring cells, and heat conducting elements. Measuring cells in the thermal block are often located symmetrically in relation to the center. However, the heat flow coming from the main heater affects them unevenly. At different overall parameters of reference and test substances uneven cells heating leads to measurement error increase. Since the defining of thermal characteristics of materials using DSC is carried out in a dynamic mode it is necessary to take into account not only the dependence of measuring cell parameters on time, but also the spatial distribution of the external thermal impact affecting it. Measuring cell DSC mathematical model is given as a block with a distributed input and concentrated output effect. The model takes into account the uneven spatial distribution of the thermal field in the thermal block, as well as heat removal from the substrate through the sensing elements considered to be inertial links. A structural model of the heat flow control system in a heat block DSC was constructed on the basis of the measurement cell mathematical model. The model shows the following: basic elements and their relationships, radiation influence on heat flow formation reaching the measuring cell and additional heat formation from micro aggregates, its influence on the measuring cell. After a number of experiments, a computer model of the automatic heat flow control system in the measuring cell of the differential scanning calorimeter DSC-500 was built as a control object with distributed parameters. This model serves as the basis for numerical experiments required to adjust the regulators parameters of the main and additional heaters in the thermal block of the DSC at different modes of this information-measu

关键词： modeling distributed parameters heat flow measurement differential temperature calorimeter

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Surge Tank Stability under distributed parameters 26

Surge Tank Stability under Distributed Parameters

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26th International Conference on System Theory, Control and Computing (ICSTCC)

作者： Danciu, Daniela Popescu, Dan Rasvan, Vladimir Univ Craiova Dept Aut Contr & Elcncs Craiova Romania

ISBN: (数字)9781665467469

ISBN: (纸本)9781665467469

The paper considers the stability analysis of the surge tank in hydroelectric power plants, in the case of elastic upstream water column i.e. with distributed parameters tunnel. The model is obtained as a special case from a rather general hydroelectric plant structure with distributed parameters of the water flow along the conduits. The stability of the linearized model is discussed using the stability of an associated system of neutral functional differential equations via the classical results on Hurwitz quasi-polynomials obtained by N. G. Cebotarev and N. N. Meyman. Application of these results leads to an improved Thoma inequality containing a safety factor larger than 1.

关键词： hydroelectric plant dynamics surge tank stability distributed parameters

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An Effective Boundary Integral Equation Method for Extracting distributed parameters of Interconnects

An Effective Boundary Integral Equation Method for Extractin...

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International Applied-Computational-Electromagnetics-Society Symposium - China (ACES)

作者： Tang, Min Zhao, Yu Mao, Junfa Shanghai Jiao Tong Univ Minist Educ China Res Design & Electromagnet Comp Key Lab Shanghai Peoples R China

ISBN: (纸本)9780996007894

A boundary integral equation (BIE) method for extracting distributed parameters of coupled interconnects is proposed in this paper. With the equivalent principle, the electric field on the boundary is correlated with surface current through a contour integration. The adaptive cross approximation technique is employed to accelerate the solving procedure. The validity and accuracy of the proposed method are demonstrated by the numerical results.

关键词： Adaptive cross approximation distributed parameters equivalent principle interconnects

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Mitigation Conducted-EMI Emission Strategy Based on distributed parameters of Power Inverter System in Electric Vehicle 2

Mitigation Conducted-EMI Emission Strategy Based on Distribu...

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2nd IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Zhai, Li Lin, Liwen Song, Chao Zhang, Xinyu Beijing Inst Technol Natl Engn Lab Elect Vehicles Beijing Peoples R China Beijing Inst Technol Beijing Coinnovat Ctr Elect Vehicles Beijing Peoples R China Beijing Inst Radio Metrol & Measurement Beijing Peoples R China

ISBN: (纸本)9781509015467

Large dv/dt and di/dt due to power device fast switching within a DC-fed voltage-type PWM inverter of high power density and high-efficiency motor drive system for electric vehicle (EV) always introduce unwanted high frequency noise current through parasitics/distributed parameters of the motor drive system. The complete test setup for conducted-EMI emission from the AC motor drive system of EV are built to measure the conducted voltage of DC cables. The CM EMI current paths at resonance frequencies 500KHz and 30MHz are analyzed based on the distribution parameters. The CM current equivalent circuits for 500 kHz and 30MHz are presented. The dominated elements responsible for the appearing resonances at 500 kHz and 30MHz in measurement results are determined. A mitigation conducted-EMI emission strategy based on distributed parameters of power inverter system in EV is proposed. Simulation and measurement are used to validate the mitigation mothed.

关键词： electric vehicle power inverter distributed parameters conducted-EMI mitigation strategy

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Systems with substantially distributed parameters

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Annual Review in Automatic Programming 1985年第PART 1期12卷 421-424页

作者： Brack, Georg Technische Hochschule Carl Schorlemmer Sektion Verfahrenstechnik. DDR-4200 MerseburgGermany

In a system with substantially distributed parameters the state vector q represents a distribution density function over some parameter z: q = q(z,t). Derivatives exist only with respect to time t, whereas in spatially distributed systems derivatives exist with respect to more than one independent variable (time and space variables). The paper gives the definition of substantially distributed parameter (s. d.p.) systems and discusses some aspects of the solution of linear s. d.p. equations from an engineering point of view. © 1985.

关键词： distributed parameters multidimensional systems state equations

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A General Form of the Mathematical Model for the Analysis of Transient States of Complex Electromechanical Systems with distributed parameters

A General Form of the Mathematical Model for the Analysis of...

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ELEKTRO 10th International Conference

作者： Lis, Marek Patro, Marek Nowak, Marcjan Rusek, Andrzej Czestochowa Tech Univ Fac Elect Engn Czestochowa Poland

ISBN: (纸本)9781479937219

In the paper a literature review concerning development and application of mathematical models for the analysis of transient states of complex electro-mechanical systems with distributed parameters is presented. Special attention is paid to real-life systems and to presentation of results of digital simulations. In the paper the assumptions for the analysis of transient states of complex electro-mechanical systems in the context of occurrence of vibrations in the rotation transmission system. A general form of the mathematical model for the analysis of transient states of electro-mechanical systems is given, which makes it possible to describe in the continuous form the system of rotation transmission for any of its components. The final form of the equations of the mathematical model, which makes it possible to carry out the digital simulations and to obtain the results as 3D planes that depict the vibrations in reference to time and to real fragments of rotation transmission chain for chosen quantities under examination, is presented.

关键词： transient states electro-mechanical systems distributed parameters rotation transmission system vibrations

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An Extraction Method of distributed parameters for One Type of Unparallel Transmission Lines

An Extraction Method of Distributed Parameters for One Type ...

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IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

作者： Chen, Xudong Li, Ying Luo, Jianshu Natl Univ Def Technol Coll Sci Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9781479952748

The main objective of this work is to quantitatively study the extraction problem of distributed parameters of unparallel transmission lines, especially for one specific type of unparallel transmission line model. The infinitesimal transmission lines are equivalent to the parallel transmission lines, and the estimation method of distributed parameters is presented based on the original physical definition of distributed parameters. Numerical experiments show that distributed parameters are related to axial variable and the angle of wires, it represents the nonuniform characteristic of parameters;when the angle of the wires is close to zero, the distributed parameters are the same as the parameters of parallel transmission lines, which validates the effectiveness of the method.

关键词： unparallel transmission lines axial variable angle of wires distributed parameters

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Numerical Analysis of Doubly Nonlinear Reaction-Diffusion System with distributed parameters 4

Numerical Analysis of Doubly Nonlinear Reaction-Diffusion Sy...

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4th International Symposium on Multidisciplinary Studies and Innovative Technologies, ISMSIT 2020

作者： Sadullaeva, Sh. Fayzullaeva, Z. Nazirova, D. Tashkent University of Information Technologies named after Muhammad al-Khwarizmi Tashkent Uzbekistan Mathematics and Computer Analysis National University of Uzbekistan Tashkent Uzbekistan

In this work are investigated the properties of the wave solutions of reaction-diffusion system with double nonlinearity. The influence of the parameters is investigated of the reaction-diffusion system in the evoluti... 详细信息

ISBN: (纸本)9781728190907

关键词： distributed parameters doubly nonlinearity numerical analysis reaction-diffusion system wave solution

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Learning distributed parameters of Land Surface Hydrologic Models Using a Generative Adversarial Network

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WATER RESOURCES RESEARCH 2024年第7期60卷 e2024WR037380-e2024WR037380页

作者： Sun, Ruochen Pan, Baoxiang Duan, Qingyun Hohai Univ Natl Key Lab Water Disaster Prevent Nanjing Peoples R China Hohai Univ Coll Hydrol & Water Resources Nanjing Peoples R China Hohai Univ China Meteorol Adm Hydrometeorol Key Lab Nanjing Peoples R China Chinese Acad Sci Inst Atmospher Phys Beijing Peoples R China

Land surface hydrologic models adeptly capture crucial terrestrial processes with a high level of spatial detail. Typically, these models incorporate numerous uncertain, spatially varying parameters, the specification of which can profoundly impact the simulation capabilities. There is a longstanding tradition wherein parameter calibration has served as the conventional procedure to enhance model performance. However, calibrating distributed land surface hydrologic models presents a great challenge, often resulting in uneven spatial performance due to the compression of information inherent in model outputs and observations into a single-value objective function. To address this problem, we propose a novel Generative Adversarial Network-based Parameter Optimization (GAN-PO) method. By leveraging a deep neural network to discern model spatial biases, we train a generative network to produce spatially coherent parameter fields, minimizing distinctions between simulations and observations. By leveraging neural network-based surrogate models to make the physical model differentiable, we employ GAN-PO to calibrate the Variable Infiltration Capacity (VIC) model against evapotranspiration (ET) over China's Huaihe basin. The results show that GAN-PO can diminish errors in simulated ET derived from default parameters across nearly all grid cells within the study region, surpassing the conventional calibration approach based on the parameter regionalization technique. Ablation analysis indicates that relying solely on the traditional loss could lead to deteriorated model performance, underscoring the crucial role of the discriminator. Notably, due to the discriminator's explicit identification of model spatial biases, GAN-PO excels in maintaining spatial consistency, outperforming the state-of-the-art differentiable parameter learning (dPL) method in terms of model spatial performance. A novel generative adversarial network-based parameter estimation method is proposed to cal

关键词： land surface hydrologic models distributed parameters deep learning generative adversarial network

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A Method for Estimating the Amplitude-Frequency Characteristics of the Cable Line Model With distributed parameters

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2022年 71卷 1页

作者： Pu, Yang Shu, Qin Chang, Jikai Xu, Fangwei Sichuan Univ Coll Elect Engn Chengdu 610065 Peoples R China

The amplitude-frequency characteristics play an essential role in analyzing transmission power grids, such as harmonic amplification using the amplitude-frequency characteristics as the harmonic amplification factor, harmonic resonance, etc. However, when the cable line with distributed parameters is connected to powers, the model would be troublesome to be calculated for the amplitude-frequency characteristics by the existing methods. To fill this gap, we proposed a method of variable covariance probabilistic data association (PDA) Kalman filtering deconvolution. First, a typical high-voltage cable transmission system (HVCTS) and its dynamic model are established. Next, a square wave impulse excitation (SWIR) is injected into the system, and the square wave impulse response is extracted at the measurement ports. Then the variable covariance PDA Kalman filter (VCPDAKF) algorithm is proposed to denoise the noisy square wave impulse response. Meanwhile, the deconvolution method is used to obtain the amplitude-frequency characteristics based on the convolution model. Finally, it is verified through simulation and experiment that the VCPDAKF algorithm could effectively denoise the noisy square wave impulse response. The effectiveness of the proposed method for the amplitude-frequency characteristics is verified.

关键词： Power cables Power grids Noise measurement Harmonic analysis Impedance Kalman filters Probabilistic logic Cable line deconvolution distributed parameters Kalman filtering probabilistic data association (PDA)

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