检索结果-内蒙古大学图书馆

Method for Parametric Optimization in Problems of the Multichannel Control of Systems with distributed parameters

JOURNAL OF COMPUTER AND SYSTEMS SCIENCES INTERNATIONAL 2019年第4期58卷 545-559页

作者： Rapoport, E. Ya. Samara State Tech Univ Samara 443100 Russia

We propose a constructive technology for solving parametrizable problems of multichannel optimal control in systems with distributed parameters under conditions of a given accuracy of uniform approximating the resultant spatial distribution of the controlled variable to the desired state. The developed technique uses the parametrization procedure of the sought control actions and the subsequent reduction to the special form of the task of semi-infinite optimization, which is solved by the scheme of the alternance method proposed earlier;this scheme is generalized to the investigated situation. We present an example (which is of interest by itself) of time-optimization of the process of nonstationary heat conductivity with two boundary control actions.

关键词： Scheme Optimization Procedure Action control variable Parametric Thermal Conductivity distributed parameter

来源：评论

学校读者我要写书评

暂无评论

High gain output feedbacks for systems with distributed parameters

引用

MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES 1999年第6期9卷 933-940页

作者： Nikitin, S Nikitina, M Arizona State Univ Dept Math Tempe AZ 85283 USA

This paper deals with the high gain feedback stabilization of single input-single output (SISO) minimum-phase systems with distributed parameters. Sufficient conditions for an infinite-dimensional SISO system to be stabilized by a high gain output feedback are obtained. The results of this paper are useful for designing and tuning high gain output feedbacks in numerous industrial control applications.

关键词： Output Output feedback Feedback single input single output systems high gain distributed parameter

来源：评论

学校读者我要写书评

暂无评论

Boundary Control of a Parabolic System with distributed parameters on a Graph in the Class of Summable Functions

引用

AUTOMATION AND REMOTE CONTROL 2015年第2期76卷 318-322页

作者： Provotorov, V. V. Voronezh State Univ Voronezh 394693 Russia

This paper considers a differential system whose state is described by a parabolic initial boundary value problem with distributed parameters on a graph. For the above system, the author studies the problem of boundary control in the class of generalized solutions. Control action and observations are simultaneously boundary. And finally, the existence conditions of a unique control action and the expressions characterizing control actions are obtained.

关键词： control action distributed parameter differential system Boundary

来源：评论

学校读者我要写书评

暂无评论

Event-based model calibration approaches for selecting representative distributed parameters in semi-urban watersheds

引用

ADVANCES IN WATER RESOURCES 2018年第Aug.期118卷 12-27页

作者： Awol, Frezer Seid Coulibaly, Paulin Tolson, Bryan A. McMaster Univ Dept Civil Engn 1280 Main St West Hamilton ON L8S 4K1 Canada McMaster Univ Jointly Sch Geog & Earth Sci 1280 Main St West Hamilton ON L8S 4K1 Canada Univ Waterloo Dept Civil & Environm Engn 200 Univ Ave W Waterloo ON N2L 3G1 Canada

The objective of this study is to propose an event-based calibration approach for selecting representative semi-distributed hydrologic model parameters and to enhance peak flow prediction at multiple sites of a semi-urban catchment. The performance of three multi-site calibration approaches (multi-site simultaneous (MSS), multi-site average objective function (MS-A) and multi-event multi-site (ME-MS)) and a benchmark at-catchment outlet (OU) calibration method, are compared in this study. Additional insightful contributions include assessing the nature of the spatio-temporal parameter variability among calibration events and developing an advanced event-based calibration approach to identify skillful model parameter-sets. This study used a SWMM5 hydrologic model in the Humber River Watershed located in Southern Ontario, Canada. For MS-S and OU calibration methods, the multi-objective calibration formulation is solved with the Pareto Archived Dynamically Dimensioned Search (PA-DDS) algorithm. For the MS-A and ME-MS methods, the single objective calibration formulation is solved with the Dynamically Dimensioned Search (DDS) algorithm. The results indicate that the MS-A calibration approach achieved better performance than other considered methods. Comparison between optimized model parameter sets showed that the DDS optimization in MS-A approach improved the model performance at multiple sites. The spatial and temporal variability analysis indicates a presence of uncertainty on sensitive parameters and most importantly on peak flow responses in an event-based calibration process. This finding implied the need to evaluate potential model parameters sets with a series of calibration steps as proposed herein. The proposed calibration and optimization formulation successfully identified representative model parameter set, which is more skillful than what is attainable when using simultaneous multi-site (MS-S), multi-event multi-site (MS-ME) or at basin outlet (OU) approac

关键词： model parameters watersheds Hydrologic models Event-based BENCHMARKS distributed parameter

来源：评论

学校读者我要写书评

暂无评论

Parametric Optimization of Systems with distributed parameters in Problems with Mixed Constraints on the Final States of the Object of Control

引用

JOURNAL OF COMPUTER AND SYSTEMS SCIENCES INTERNATIONAL 2018年第5期57卷 723-737页

作者： Pleshivtseva, Yu. E. Rapoport, E. Ya. Samara State Tech Univ Samara Russia

A constructive technology of the solution of the parametrized problems of the programmed optimal control of systems with the distributed parameters under the conditions of different requirements for the permissible deviation of the resulting spatial distribution of the controlled value from the set magnitude in the uniform metric is proposed. The developed technique uses a special procedure of the one-criterion convolution of the considered constraints and the subsequent reduction to the typical form of the problems of mathematical programming on the extremum of a function of a finite number of variables with an infinite number of constraints (semi-infinite optimization problem), which is solved by the scheme of the previously developed alternance method. An example of optimization by the criteria of the speed and energy consumption of unsteady heat conduction processes with two different restrictions on the accuracy of approximation to the given temperature conditions, which is of independent interest, is given.

关键词： Standing Orders extremum values temperature conditions spatial distribution distributed parameter terminal states Transient heat conduction

来源：评论

学校读者我要写书评

暂无评论

PLASMA-HEATING BY A STRONG LASER FIELD WITH STATISTICALLY distributed parameterS

引用

NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS 1991年第5期13卷 663-676页

作者： DANIELE, R MESSINA, G FERRANTE, G FAC INGN REGGIO CALABRIA IST FISI-89100 REGGIO CALABRIAITALY IST FIS TEORICA I-98100 MESSINAITALY DIPARTIMENTO ENERGET & APPLICAZ FIS SCI I-90128 PALERMOITALY

The energy absorption rate by a classical homogeneous plasma irradiated by a strong fluctuating laser field via inverse bremsstrahlung is considered. A chaotic-field model is used and comparison is made with the fundamental model of a purely coherent field. In the present analysis, the emphasis is put on the interplay between the laser field statistics and the plasma electron energy distribution. Numerical calculations are concerned with the dependence of the energy absorption rates on laser intensity and frequency. Laser intensity values up to 4.6.10(15) W/cm2 are considered. The multiphoton structure of the energy absorption is analysed as well. Concerning the joint influence of the radiation and particle statistics on the absorption rate, the basic result may be stated as follows. For situations where the particle thermal velocity v(T) is larger than the oscillatory velocity v0 imparted by the field (v(T) greater-than-or-equal-to v0, relatively weak field), the absorption rate is only weakly dependent on the field statistics. For situations, instead, when v0 >> v(T), which occurs for very high intensities, the reverse becomes true: now the initial particle velocity distribution plays the modest role of a velocity spread of an electron beam oscillating at v0. In general, for very high intensities (v0 >> v(T)), the energy absorption via bremsstrahlung becomes less effective because the high oscillatory velocity v0 reduces the time available to electrons for the interaction with the ions, the third body which makes possible the exchange for energy between electrons and a radiation field. We report also, for the first time, results on the Marcuse effect for the case of a chaotic laser field, along with calculations of the absorption rate for a directed electron beam.

关键词： energy absorption RADIATION FIELD basic model Plasma heating Electrons Laser distributed parameter Fields Bremsstrahlung

来源：评论

学校读者我要写书评

暂无评论

Impact of distributed parameters on conducted EMI in electric vehicles motor drive system

Impact of distributed parameters on conducted EMI in electri...

引用

Applied Energy Symposium and Summit - Low Carbon Cities and Urban Energy Systems (CUE)

作者： Zhai, Li Zhang, Xinyu Gao, Xinjie Lee, Guangzhao Zou, Ming Sun, Tianmin Beijing Inst Technol Zhongguancun South St 5 Beijing 100081 Peoples R China Beijing Elect Vehicle Co LTD Caiyu Econ Dev Zone Caihe St 1 Beijing 102606 Peoples R China

The effect of distributed parameters on conducted EMI is investigated in its motor drive system under load conditions for an electric vehicle. A conducted EMI testing platform was constructed for the system. By testing the conducted EMIs from the system under both load and idle conditions, the propagation paths of both high-and-low frequency differential-mode noise and common-mode interference were analyzed and the equivalent circuits were established. In frequency domain, the mechanism of the conducted EMIs was studied and the effect of distributed parameters on them was discussed. Tests show that high-frequency conducted EMI can be reduced by properly enlarging the distributed capacitances both between ground and power devices in the motor controller and between ground and dc-bus. (C) 2016 Published by Elsevier Ltd.

关键词： electric vehicles motor drive system conducted electromagnetic interference distributed parameter

来源：评论

学校读者我要写书评

暂无评论

Stabilization of a generalized stochastic neural network with distributed parameters

Stabilization of a generalized stochastic neural network wit...

引用

International Conference on Machine Learning and Cybernetics

作者： Luo, Q Deng, FQ Bao, JD S China Univ Technol Inst Automat Sci & Engn Guangzhou Peoples R China

ISBN: (纸本)0780378652

In this paper, we study stabilization of Cohen-Grossberg type generalized neural networks with distributed parameters. The main idea is to treat the integral of the stochastic field solution to the system as the solution process to the corresponding stochastic ordinary differential equation and then discuss stabilization of the process of solution. The integral is respect to the spatial variables. To implement this idea, we use the Ito differential formula to compute the differential of a Lyapunov function along the system. The Lyapunov function is the average respect to the spatial variables. We found that there is no Ito formula for the stochastic systems with distributed parameters, up to now. Our method overcomes this difficulty. Also, we have not seen any result on the stochastic neural networks with distributed parameters.

关键词： distributed parameter generalized stochastic neural networks stability

来源：评论

学校读者我要写书评

暂无评论

Boundary Control of a Parabolic System with Delay and distributed parameters on the Graph

Boundary Control of a Parabolic System with Delay and Distri...

引用

International Conference on Stability and Control Processes in Memory of V.I. Zubov (SCP)

作者： Provotorov, Vyacheslav V. Voronezh State Univ Dept Partial Differential Equat & Probabil Theory 1 Univ Skaya Pl Voronezh 394006 Russia

ISBN: (纸本)9781467376983

The optimal boundary control problem for a differential system with delay and distributed parameters on the graph is considered. The spaces of integrable functions are used as state-space systems and the space of boundary control and observation. The conditions of the unique solvability of the problem of optimal control are obtained.

关键词： distributed parameter System Latency delay-differential systems Boundary boundary layer Line graph aerospace systems Optimal control delay

来源：评论

学校读者我要写书评

暂无评论

Resonance phenomena dependent on the initial conditions in dynamic systems with distributed parameters and a time delay

引用

Soviet Applied Mechanics 1969年第9期5卷 990-991页

作者： Korenevskii, D.G. Mitropol'skii, Yu.A.

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：