检索结果-南通市图书馆

Optimal Tracking Performance With Model Uncertainty Over A Quantized Control Input

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optimal Tracking Performance With Model Uncertainty Over A Q...

Optimal modified tracking performance of discrete-time NCSs with packet dropouts constraint 36

第25届中国控制与决策会议

作者： Ming Chi Zhi-Hong Guan Fu-Shun Yuan xi-sheng zhan Department of Control Science and Engineering Huazhong University of Science and Technology School of Mathematics and Statistics Anyang Normal University College of Mechatronics and Control Engineering Hubei Normal University

ISBN: (纸本)9781467355322

There has recently been significant interest in feedback control problems with communication constraints. But the existed work mainly assume that the plant has an exact model. The object of this paper is to investigate the optimal tracking problems for networked control system in the presence of plant uncertainty. This paper studies optimal tracking performance issues for finite-dimensional, continuous-time, linear time-invariant （LTI） networked control systems, in which the control input is subject to a quantization and the plant model with uncertainty. The problem under consideration amounts to determining the minimal tracking error, while we consider two-parameter controllers. The plant is assumed to be non-minimum phase and unstable, that is, the plant contains zeros in the right half and unstable poles. And we formulate the uncertainty by utilizing stochastic embedding. The integral square criterion is adopted to measure the tracking error. The results show that the quantization error and the model uncertainty, as well as the non-minimum phase zeros, can worsen the tracking performance.

关键词： quantization tracking performance limitation networked control systems uncertainty non-minimum phase zeros.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Optimal modified tracking performance of discrete-time NCSs ...

Optimal Tracking Performance of MIMO Networked Control Systems with Communication Constraints

第36届中国控制会议

作者： Jian-Bao Tang Jie Wu xi-sheng zhan Huai-Cheng Yan Hong-Liang Gao Hubei Normal University East China University of Science and Technology

ISBN: (纸本)9781538629185

The optimal modified tracking performance of single-input single-output（SISO） discrete-time networked control systems（NCSs） with packet dropouts is investigated in this *** explicit expression is obtained by using the method of partial fraction and co-prime factorization.A new modified tracking performance index of NCSs is provided to present variations in the tracking error when there is no integrator in the *** obtained result demonstrates that the optimal modified tracking performance is related to the intrinsic properties of the given plant such as non-minimum phase（NMP） zeros,unstable ***,the modified factor,packet dropouts and channel noise have impact on the optimal modified performance of the ***,some typical examples are given to illustrate the theoretical results.

关键词： Optimal modified tracking performance Networked control systems Packet dropouts Channel noise

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Optimal Tracking Performance of MIMO Networked Control Syste...

第26届中国控制与决策会议

作者： Chao-Yang Chen Ming Chi Zhi-Hong Guan xian-He zhang xi-sheng zhan College of Automation Huazhong University of Science and Technology College of Mechatronics and Control Engineering Hubei Normal University

In this paper, we study the optimal tracking performance problem of continuous-time linear multi-input multi-output（MIMO） networked control systems. The unstable and non-minimum phase systems is considered. The output feedback path is subject to quantization noise, additive white Gaussian noise and bandwidth constraints, and encoding and decoding are considered. The reference input is a random signal. The performance is measured through the tracking error energy, and two-parameter controller is considered. The explicit expression of the tracking performance has been obtained. The results show that the unstable poles and non-minimum phase zeros of the plant, the channel noise,bandwidth, quantization noise and coder will aggravate the optimal tracking performance.

关键词： Tracking Performance Channel Noise Quantization Noise Bandwidth Constraint

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

平原封闭区洪涝水深计算方法探讨

电力勘测设计 2009年第1期21卷 26-28页

作者：张磊席占生河南省电力勘测设计院郑州450007

本文从物理成因出发,将平原封闭区概化为水文模型,利用水量平衡原理,采用设计洪水与历史典型洪水比值法计算平原封闭区洪涝水深,探讨一种计算平原封闭区洪涝水位的新方法,易于工程操作,便于在工程中应用。

关键词：平原封闭区洪涝水位比值法

在线全文

学校读者我要写书评

暂无评论

基于中尺度数据的风电场代表年分析

电力勘测设计 2019年第A1期31卷 246-248,270页

作者：陈春喜席占生国核电力规划设计研究院有限公司

由于风电场与气象站的地形地貌、下垫面条件的差异,导致风电场测风塔数据与参证气象站测风数据相关性较差,不能直接采用16扇区相关法进行订正。本文以山西某风电场风能资源分析为例,引入中尺度模式数据,对比其与参证气象站风速变化规律... 详细信息

由于风电场与气象站的地形地貌、下垫面条件的差异,导致风电场测风塔数据与参证气象站测风数据相关性较差,不能直接采用16扇区相关法进行订正。本文以山西某风电场风能资源分析为例,引入中尺度模式数据,对比其与参证气象站风速变化规律,并将其运用在代表年分析与订正中。

关键词：中尺度风电场代表年相关

在线全文

学校读者我要写书评

暂无评论

黄河游荡性河床大跨越纵向冲刷深度的确定

电力勘测设计 2011年第6期23卷 26-28,43页

作者：席占生李显鑫国核电力规划设计研究院北京100094 国网北京经济技术研究院北京100052

塔基纵向冲刷深度是分析塔基最小埋置深度,评价基础安全性和经济性的重要技术指标。首先根据黄河历史资料,利用推荐公式计算塔基纵向冲刷深度,分析了公式计算结果的可靠性。介绍了局部动床模型试验应关注的主要问题,通过实验结果与公式... 详细信息

塔基纵向冲刷深度是分析塔基最小埋置深度,评价基础安全性和经济性的重要技术指标。首先根据黄河历史资料,利用推荐公式计算塔基纵向冲刷深度,分析了公式计算结果的可靠性。介绍了局部动床模型试验应关注的主要问题,通过实验结果与公式计算结果对比分析,最终确定纵向冲刷深度取值,为塔基埋置深度提供了合理的设计依据。

关键词：游荡性河床大跨越纵向冲刷公式计算局部动床模型

Facile synthesis of the dodecahydridododecaborate (B12H122-) from borane Lewis base adducts

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Yi Jing xin-Ran Liu xing-Hua Wang Hui Han Sha-Sha Liang xi-Meng Chen Dong-Hui Wei Lai-sheng Wang Xue-Nian Chen College of Chemistry Zhengzhou University School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced MaterialsHenan Normal University Department of Chemistry Brown University

Polyhedral boranes are a class of well-known boron molecular clusters widely used in energy,chemistry,medicine,and materials science because of their unique physical and chemical *** efforts have been made in the past decades to find more effective synthetic methods for this important class of boron ***,existing synthetic methods suffer from low efficiency and low ***,we report a facile one-pot synthesis of[（CH3）3S]2B12H12with moderate yields at mild *** mechanisms for the multi-step chemoselective synthesis of B12H122-without other by-products are elucidated based on theoretical results and our previous *** Lewis base used in B–H bond condensation reaction,which acts as a hydrogen or to balance the newly generated polyhedral borane charges,is proposed and studied in *** current study has led to a more effective and selective synthetic method for B12H122-and has also implicated the syntheses of other new polyhedral boranes.

关键词：

The interactions between bloodstream and vascular structure on aortic dissecting aneurysmal model: A numerical study

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2013年第3期29卷 462-468页

作者： Zeng-sheng Chen zhan-Ming Fan xi-Wen zhang Department of Engineering Mechanics School of AerospaceTsinghua University Institute of Heart Pulmonary & Vascular Diseases Capital University of Medical Science Affiliated Beijing Anzhen Hospital

Stent-graft implantation is an important means of clinical treatment for aortic dissecting aneurysm （ADA）. However, researches on fluid dynamics effects of stent were rare. Computer simulation was used to investigate the interactions between bloodstream and vascular structure in a stented ADA, which endures the periodic pulse velocity and pressure. We obtained and analyzed the flow velocity distribution, the wall displacement and wall stress in the ADA. By comparing the different results between a non-stented and a stented ADA, we found that the insertion of a vascular graft can make the location of maximum stress and displacement move from the aneurysm lumen wall to the artery wall, accompanied with a greatly decrease in value. These results imply that the placement of a stent-graft of any kind to oc-clude ADA will result in a decreased chance of rupture.

关键词： Aortic dissecting aneurysm (ADA) · Stent-graft · Fluid-structure interaction (FIS)

Stability and Hopf Bifurcation Analysis on a Numerical Discretization of the Distributed Delay Equation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第5期29卷 7-10页

作者： WU Jie zhan xi-sheng zhanG xian-He GAO Hong-Liang College of Mechatronics and Control Engineering Hubei Normal UniversityHuangshi 435002

A kind of discrete logistic model with distributed delays obtained by the Euler method is investigated,where the discrete delay Τ is regarded as a *** analyzing the associated characteristic equation,it is found that the stability of the positive equilibrium and Hopf occurs when Τ crosses some critical *** the explicit formulae which determine the stability,direction and other properties of the bifurcating periodic solution are derived by using the theory of normal form and center ***,numerical simulations are performed to verify and illustrate the analytical results.

关键词： parameter. value. Hopf