Dynamic Control Model for the Secondary Cooling of Slab Casting Based on Neural Networks

A dynamic control model for the secondary cooling of slab casting is presented to reduce the difference between the actual temperature and the goal surface temperature of slab. The model, which is based on the BP neural networks for forecasting the temperature and the fuzzy neural networks for dynamically controlling the water in the secondary cooling in the continuous casting, could timely adjust and allocate the water according to the speed and temperature of slab. A series of tests have been conducted based on inputs of the No. 2 slab caster in a steel plant. It has been shown that the model, which integrate the charateristics of water controlling problem in secondary cooling into the temperature status of slab during the cooling process, can control the water in secondary cooling efficiently and dynamically according to the situation of actual production.     

秦巴山区、武陵山区集中连片扶贫调查及可持续发展模式比较研究

退耕还林与集中连片扶贫是近年来政府实施西部大开发战略的重要举措。通过对秦巴山区、武陵山区两大退耕还林和集中连片扶贫区的调查,分析指出两地区长期贫困落后的原因相似,既包括自身的自然生态、经济、人文三大系统恶性循环,也包括政府制度供给偏向的影响。根据两地区扶贫开发的现状,提出从国家层面应进一步加大对集中连片贫困地区基础设施建设和民生事业的投入;从地方政府层面应结合实际推进制度创新,做好统筹规划,制定适合区域环境要求的扶贫开发策略;在具体实践层面应通过财政转移支付、税收政策及专项资金扶持等发展生态旅游业、特色农业等新兴产业,采取以经济效益、生态效益和社会效益有机结合的扶贫模式,实现区域经济社会的可持续发展。     

Driver Model of Steering Direction Control for Automobiles

Creating a suitable driver model is one of the most important parts in the closed-loop system of driver-vehicle-road.Several kinds of driver models have been created based on the traditional control theories such as transfer function,optimization control and the compensation control.But owing to the driver's characteristics of nonlinear and time-variable,it's difficult for those proposed driver models to mimic drivers' action.While accounting for the inherent manual control characteristics and limitations of the mankind,the intelligent control methods have been applied in creating driver models based on the fuzzy control,neural networks control and fuzzy-neural networks control theory.     

Model Building and Simulation for Subcritical Pressure Boiler

In order to meet the demand of large scale boiler design and operating optimization, this paper establishes the dynamic mathematic model for domestic 600MW subcritical pressure boiler. MMS software is adopted in the whole process from modeling to simulation. This software make process simple and quick. This model is based on modulariza- tion and the comprehensive physical and chemical process in boiler is considered. Simulation result shows that the re- sponses of this model under different disturbance are coincident to mechanics analysis. The simulation result under ste Pdisturbance can be used to analyze unit changes and provide some guide and it also can supply performance reference data to boiler design.     

橡胶树光合与干物质积累模拟模型研究

基于单叶光合速率的光响应模型和冠层光的分布规律,通过积分形式,构建了橡胶树冠层光合作用模拟模型。模型充分量化了光通量密度、温度、叶面积指数、单叶最大光合速率、光合作用特征参数、消光系数、群体反射率等因子对橡胶树冠层光合速率的影响。在分别确定了叶片和木质器官与环境因子作用关系的基础上,构建了橡胶树的群体呼吸作用模型。在橡胶树冠层的光合作用模型和群体呼吸作用模型的基础上,整合成橡胶树干物质积累模拟模型。模型经初步检验,结果表明模拟值与观测值吻合度较好,模型不仅具有较强的机理性而且具有较高的预测性和实用性。     

Simulation Modeling and Simulation Analysis for the Boiler Attached to 360 MW Unit

Using modular simulation technique,a mathematical model for the combustion and air/gas system of the W shape flame boiler is presented.The experimental resulats show that.The dynamic process accords with the mechanism process of the object.     

薯蓣短体线虫发生特点及防治技术研究

引起薯蓣根腐病（又名薯蓣红斑病）病原为一种线虫Pratylenchus dioscoreae yang ＆ zhao。研究（1）查明了该线虫的寄主范围、年生活史、侵染部位、侵染时期以及在土壤中的季节消长规律和存活年限。（2）此病害由种苗、土壤、粪肥传播，提出了选用无病繁殖材料、轮作倒茬、清除病残以及药剂浸种和土壤处理等经济有效的综合防治措施。     

Fuzzy Control and Simulation of Regulating System for Permanent Magnet Synchronous Motor

This paper researches the fuzzy control and simulation of regulating system for PMSM in electrical vehicle. The mathematics model is set up.The PMSM,the PMSM measures demux, dq to abc converter and the three phrase PWM converter models are set up in MATLAB/ Simulink. The fuzzy controller is designed with two dimension fuzzy design method, and take E and EC as input variable, U is the output variable. According to the controller and models, the fuzzy control model of regulating system for PMSM is created in matlab/simulink. At last, to test the accuracy of the control method with the simulation result.     

Dynamic Optimum Control and Simulation of EGCS Based on the Field Knowledge

The authors study on Elevator Group Control System(EGCS) based on the field knowledge, the dynamic optimum control method is proposed and the analysis and design models facing the object are built. Using the MFC frame construction in VC, simulation is proceeded successfully to the EGCS with dynamic optimum control. And contrasting the general method assigning the signals invoked inside the hall at the same condition, the method gets the satisfied control result.     

黑龙江农业可持续发展系统动力学模型仿真

为实现黑龙江省农业可持续性发展,运用复杂系统的观点研究分析了农业发展的特点,将黑龙江农业发展系统划分为农业经济、农业技术、农村社会、农业环境4个子系统。在此基础上,通过分析各子系统间的关联及影响机理,利用Vensim DSS软件及《黑龙江省统计年鉴》等历史数据,经过参数估计及有效性检验,从而建立并完善了黑龙江农业可持续发展的系统动力学模型。然后对黑龙江省2005—2020年农业各子系统发展的可持续性进行仿真模拟与预测。结果发现黑龙江省的农业经济可持续度发展最好,农业技术次之,农业社会与生态环境可持续性最差。     

Mathematical Model of Selective Catalytic Reaction of Nox in Reactor and Its Simulation

As the domestic technology of selective catalytic reduction(SCR) has not been mature.A assembled-parameter dynamic mathematical model is established for the primary chemistry reaction process in SCR reactor.The mass balance equation of the NH3 adsorption-desorption on the catalyzer surface and six gas components,and total energy balance equation in SCR reactor are set up respectively.A dynamic simulation model has developed by using MATLAB simulation tool.The steady calculation for model is carried on.Based on the established dynamic simulation model,two dynamic simulation experiments have been done,which include the simulation experiment of step disturbance about NOx concentration and temperature.The simulation results current is correctl.The analyzed results indicate that the established dynamic mathematical model for SCR reactor is credible,and prove that the simulation model is practical.     

信阳市旱情动态分析与模拟监测系统

摘要：本文通过对信阳市1971-2000年近30不同年份平均气温、湿度、降水、蒸发、风速、日照、作物发育期资料、作物生长量测定资料及土壤墒情资料的统计分析,确定信阳市不同区域、不同季节干旱指标,进而建立起信阳市旱情动态模拟系统,在全市旱情动态预报中发挥着积极作用     

Model predictive control for a plug-in hybrid electric vehicle

The dynamic programming is applied to model predictive control configuration, and a predictive control mathematics model is established for the fuel economy of plug-in hybrid electric vehicles (HEVs) based on spatial-domain. A global optimal method for plug-in HEVs is studied with dynamic programming, and the results indicate that the state of charge (SOC) is reduced slowly from the maximum at a trip’s initiation to the low threshold at the destination. The theoretical SOC slope is proposed to be taken as the reference slope of model predictive control, and the theoretical reference contrail of SOC is modified according to the especial driving modes in future. The results show that the predictive control effect of this method is approached to the calculation result of global optimal and fuel consumption is obviously reduced.     

Modeling and Simulation Based on Pole-zero Placement Self-adaptive Temperature Control System

Based on model parameters estimating, a kind of algorithm of pole-zero placement self-adaptive temperature control is put forward according to closed loop apices distribution of resistance furnace temperature control. The mathematic model is presented by discursion for the controlled object, at the same time, the algorithm is illustrated identification method of model parameters, compute formula and simulation result of controlled parameters. Simulations and practices of the model proved that the algorithm is of rapid constringency speed , satisfactory effect on the object with time changing especially for the controlled objects of the high current and low voltage characteristics. The algorithm has been applied in the temperature control of intelligent slag measurement equipment of a iron-steel graduate school.     

The Research and Simulation of the Fuzzy-PID Control System for Ball Mill Pulverizing of Power Plant

This paper focuses on the main problems in the operation control for ball mill pulverizing system, proposes the dynamic mathematical model for the steel ball mill pulverizing system , simulates and analyzes the dynamic character of the system. A Fuzzy-PID controller with on-line self-tuning parameters based on fuzzy control technology is proposed .The simulation results show that the Fuzzy-PID control system can improve the controlling effect and the ability of suppressing disturbances.     

PID Control for Multivariable System Based on Ameliorative RBF Neural Networks

Aiming at systems which are of characteristics of multi-input and multi-output, nonlinearity and time-variation in the industrial control fields, this paper presents a intelligent PID control method based on ameliorative RBF neural networks, which constructs RBF neural networks identifier on-line and identifies a controlled object on-line by means of adopting the nearest neighbor-clustering algorithm, and adjusts parameters of PID controller on-line and realizes decoupiing control of multivariable, nonlinear and time-variation system. The simulation result indicates that the controller can get parameters which are optimal under some control law, it makes the decoupled system, compared to the PID control method based on the conventional RBF neural networks, has perfect dynamic and static performances, possesses the advantages of high precision, quick response speed and is of great adaptability and robustness.     

A Dynamic Model for Generation Expansion Planning and Algorithm

This paper discusses the problem of long-range generation expansion planning. A dynamic model for long-range expansion planning is set up and an algorithm-a two-step programming is presented, which is used here in a case.     

棉花形态发生和叶面积指数的模拟模型

棉花形态发生的模拟以每日生理热效应为主要驱动因子,同时考虑了地膜覆盖后地温升高对气积温的补偿作用。叶面积指数的模拟基于棉花LAI动态消长与物质流的库源关系,量化了棉花生育过程中源或库不足时的LAI增长过程。通过对模型参数的校正和核实,使模型适应于不同类型品种的形态发生和LAI动态模拟。结果表明,叶片数、株高、果枝和果节的模拟精度均差方根(RMSE)分别达到了0.7片、1.6cm、0.8个和3.3个;叶面积指数在不同品种和管理方式下的模拟精度RMSE达到了0.3,表现出较好的吻合度和适用性。     

A Delay Model and Simulation Studies for None-Signaller Intersections

A model based on Queueing Theory was developed for calculating the average queueing delays and the capacities of intersections. And the turning flows influences on the delay were analysed,the simulation results were presented in the article.