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自然对流问题的解耦两层亚格子稳定化方法

高等学校计算数学学报 2016年第3期38卷 213-224页

作者：陶珍珍邓继恩张通河南理工大学数学与信息科学学院

1引言在实际的生活中,自然对流现象是很普遍的,例如室内外的通风、双层玻璃窗户的设计、海洋的流动等等.设ΩR~d(d=2 or 3),考察如下形式的定常自然对流问题

关键词： natural convection problem two-level method subgrid stabilization decouple error estimates

Exact Temporal Evolution of Two-Species Bose–Einstein Condensates

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Communications in Theoretical Physics 2013年第11期60卷 526-530页

作者：张聪张志海杨师杰 Department of Physics Beijing Normal University State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences

We construct exact stationaxy solutions to the one-dimensional coupled Gross-Pitaevskii equations for the two-species Bose-Einstein condensates with equal intraspecies and interspecies interaction constants. Three types of complex solutions as well as their soliton limits axe derived. By making use of the SU（2） unitary symmetry, we further obtain analytical time-evolving solutions. These solutions exhibit spatiotemporal periodicity.

关键词： GP equations decouple

An Intelligence Expert System Based on Hoop Standard Granulator 25th

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An Intelligence Expert System Based on Hoop Standard Granula...

Electric Vehicle IM Controller Based on Voltage-Fed Inverter

第25届中国控制与决策会议

作者： Zhang Kun Fei Minrui Wu Jianguo Zhang Peijian School of Mechatronic Engineering & Automation Shanghai University School of Electrical Engineering Nantong University

ISBN: (纸本)9781467355339

According to the analysis of the structure and technology, and then obtaining the energy consumption calculation formula, it comes to conclusion that the hoop standard granulator is a multivariate system with large time delay, which is also uncertain and nonlinear. Aiming at the problem that the hoop standard granulator cannot be controlled well by traditional methods, a technique was proposed, based on controlling the hoop standard granulator automatically by the expert system and SVM method. For good prediction performance, SVM with genetic algorithm is chosen to build the prediction model of output temperature and the main motor current, which is set as soft sense in the expert system. The expert system could be intelligent to solve the decoupling problem, by controlling feature identification, information processing machine, knowledge base, control rule and inference machine. In order to verify the design, based on reliable real-site data some experiments are conducted under the situation of disturbance. Finally the effect of expert control system and SVM is validated by simulation.

关键词： Hoop Standard Granulator Expert System SVM Large Time Delay decouple Nonlinear

来源： cnki会议评论

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Journal of Beijing Institute of Technology 2004年第4期13卷 441-444页

作者：宋建国张承宁袁学谭建 School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing 100081 China

A novel electric vehicle (EV) induction motor (IM) controller based on voltage-fed inverter is presented. It is shown that the proposed adaptive control algorithm effectively both simplifies the structure and expands the capacity of controller. The relationship between stator's voltage and that of current under rotor's flux-oriented-coordinates is first introduced, and then the structure of vector control is analyzed, in which voltage compensation is inducted as the core feedback procedure. Experiments prove that, together with a facility for realization, a smooth transition, a prompt torque response and small concussion are gained. Extensive research conducted by varying parameters that result in practical ripple is proposed in conclusion.

关键词： voltage-fed inverter decouple vector control inteligent power module(IPM)

Decoupling Conditions for Elasto-plastic Consolidation Question Based on Numerical Modeling Method

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Journal of China University of Geosciences 2005年第4期16卷 363-368页

作者： Cheng Tao Wang Jingtao Dong Bichang School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China Civil Engineering Department Huangshi College of Science ＆ Technology Huangshi 435003 China School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074. China

Elasto-plastic consolidation is one of the classic coupling questions in geomechanics. To solve this problem, an elasto-plastic constitutive model is derived based on the numerical modeling method. The model is applied to Blot＇s consolidation theory. Incremental governing partial differential equations are established using this method. According to the stress path, the decoupling condition of these equations is discussed. Based on these conditions, an incremental diffusion equation and uncoupling governing equations are presented. The method is then applied to numerical analyses of three examples. The results show that （1） the effect of the stress path should be taken into account in the simulation of the soil consolidation question; （2） this decoupling method can predict the evolvement of pore water pressure; （3） the settlement using cam-clay model is less than that using numerical model because of dilatancy.

关键词： numerical modeling method Blot's consolidation stress path constitutive model liquisolid coupling decouple incremental diffusion equation dilatancy.

MIMO handset antenna for 5G/WLAN applications

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Frontiers of Information Technology & Electronic Engineering 2020年第1期21卷 182-187页

作者： Yong CHENG Jing LU Bing-qing SHENG College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China

We propose a dual-module multiple-input multiple-output(MIMO)antenna for portable *** operating bands of the handheld terminal antenna are 5G(3.4–3.8 GHz)and WLAN(5.150–5.925 GHz).Antenna elements of 5G and WLAN are spaced to reduce coupling between antenna elements in the same *** return loss of all antenna elements is larger than 6 *** isolation between all elements is larger than 14 *** radiation efficiency of the high-frequency antenna is greater than 50%,and the radiation efficiency of the low-frequency antenna is greater than 40%.The far-field gain of all elements is greater than 2.2 dBi.

关键词： Fifth-generation(5G) Handset antenna Multiple-input multiple-output(MIMO)antenna decouple

Multivariable Decoupling Predictive Control Based on QFT Theory and Application in CSTR Chemical Process

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Chinese Journal of Chemical Engineering 2006年第6期14卷 765-769页

作者：王增会陈增强孙青林袁祉 Department of Automation Nankai University

A novel method of incorporating generalized predictive control GPC algorithms based on quantitative feedback theory QFT principles is proposed for solving the feedback control problem of the highly uncertain and cross-coupling plants. The quantitative feedback theory decouples the multi-input and multi-output MIMO plant and is also used to reduce the uncertainties of the system, stabilize the system, and achieve tracking performance of the system to a certain extent. Single-input and single-output SISO generalized predictive control is used to achieve performance with higher performance. In GPC, the model is identified on-line, which is based on the QFT input and the plant output signals. The simulation results show that the performance of the system is superior to the performance when only QFT is used for highly uncertain MIMO plants.

关键词： quantitative feedback theory generalized predictive control decouple multivariable uncertain system frequency domain design

Improved Design and Modeling of Micromachined Tuning Fork Gyroscope Characterized by High Quality Factor

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Journal of Electronic Science and Technology 2010年第3期8卷 280-286页

作者： Ji-Ping Guan Xiao-Ming Liu with School of Mechatronics Engineering University of Electronic Science and Technology of China Chengdu 610054 China

This paper proposes an improved design of micromachined tuning fork gyroscope （M-TFG） to decouple the cross talk between driving and sensing directions better and to increase resolution. By employing dual-folds spring suspension, the drive mode and the sense mode are mechanically decoupled. Through careful layout design of the location of the dual-folds spring suspension and the drive combs, the mechanical coupling effect is further decreased by isolating the unwanted excitation from detection. The quality factor investigation demonstrates that high quality factor can be attained by using this structure, which can bring in accurate resolution. As a result, this design has the potential to accomplish low bias drift and accurate resolution for initial level applications.

关键词： decouple gyroscope micromachined quality factor tuning fork.

Decoupling Classification and Localization for Single Stage 3D Vehicle Detection from Point Clouds

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Decoupling Classification and Localization for Single Stage ...