Two Types Modules for the Boiler Attached to 330 MW Unit

Boiler is an important facility in power plant , the safety and economy of unit is affected by it. Studying the dynamic of boiler can improve the knowledge about boiler , which is important for. Features of MMS are introduced based on MMS simulation setting, and the real time capable module and non real time capable module are compared from principle. Real time capable dynamic model of boiler and non real time capable dynamic model of boiler of 330 MW unit are established . The experimental results show that the dynamic process of two type model accords with the mechanism of the object , at the same time, the validity of real time capable module is discussed .     

Adaptive Inverse Control for Feed Water and Superheated Steam Temperature of Supercritical Pressure Boiler

An adaptive inverse control method for feed water and superheated steam temperature of supercritical pressure boiler is investigated. Through the analysis of the boiler system ,s dynamic characteristics, the input vector structure of inverse dynamics model of feed water and superheated steam temperature is constructed. The adaptive inverse control system is realized through on-line identification of inverse dynamic model with recursive least squares support vector machine. In the control process, the demand for feed water and spray water flow to the outlet steam temperature and micro-superheated steam temperature is considered to realize the integrated control of feed water and superheated steam temperature. Simulation results show that this control system has good control performance and adaptability and can void the repeated oscillation phenomena of control variables which appear in present two section control system.     

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.     

A Dynamic Mathematical Model of Ball Pulverized Storage System and Its Simulation with MMS

This paper presents a mathematical model , simulating program and results ofball pulverlzed coal storage system. The program of simulation is writen with ACSL language. theGear arithmetics to solve the differentlal equations is recom merded by MMS. The model has beenmodularized according to the reguirements of MMS. This modular called DTM modular can be con-sidered as one component of MMS modular library.     

Modeling and Simulation for 440 t/h CFB Boiler Steam/Water System

Dynamic mathematical model,which is based on the character of power-plant boiler system,is established by the means of modularization. On the basis of dynamic mathematical models,simulation model of the object is created with the advanced continuous simulation language(ACSL).The validity of this model has been verified by the simulation experiments and analysis.The simulation model helps to evaluate the influences that the dynamic process in steam/water's side brings to the boiler's operation and have some directive significance to design method of boiler and optimize run.     

Dynamic Simulation for Hydraulic Pressure AGC of Rolling Mill

AGC control technology is one of the key techniques used in modern rolling mill, the effect of which has influence on the accuracy of the product. On the base of analysing system composition and dynamic characteristics of the main dynamic emelent, a danamic simulation model is put forward,and then dynamic simultion for the hydraulic AGC system of 3340 rolling mill is implemented. Then, it lays a foundation for the design of rolling system and the dynamic simulation of the rolling process.     

Dealing with Thermal Exchange in Temperature Field Simulation in Low Pressure Die-casting Process

The main effort is to develop numerical simulation software of low pressure die casting on Windows platform in Personal Computer, based on the production of aluminum wheel in Die cast wheel manufacture Co. Ltd.. The heat conduction calculation is the basis of solidification simulation. A 3 dimentional model including the refrigeration medium block is set up based on the study of boundary heat exchange. Various calculation method is analyzed for different types of boundary element. A comprehensive calculation model is set up according to practically manipulable parameters in production.     

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。     

Modelling and Simulation of Anoxic Biofilter for Municipal Wastewater Treatment

For a further understanding of biofilter, a mathematical model is developed based on the analysis of the main effects on the up flow anaerobic biofilter(UFAB), which can characterize not only the substrate removal dynamics but also the gradual biofilter clogging. The model considers three aspects: the biological reaction, deep filtration and hydrodynamics, and consists of flow rate of UFAB, the substrate and suspend solid concentration in the influent, and diameter, surface area, porosity of support medium. By applying the model to the experimental UFAB, and contrasting the simulated and experimental data, the authors prove the model can simulate availably the performance of the biofilter, which is operated on different loading and environment. The model can be used as an effective tool for the wastewater treatment plants operation management and the biofilter optimizing design accurately.     

Simulation of High Pressure Startu Poil Pum Pof Turbine

Dynamic mathematical model, which is based on the character of the 200 MW tubine lbricating oil system, is established by means of modularization. On the basis of dynamic mathematical models, simulation model of the startu Pprocess of hign pressure startu Poil pum Pis created with the Visual Fortran language. The validity of this model has been verified by the simulation experiments and analysis. The simulation helps to forecast the dynamic characteristic to high pressure startu Poil pum Pand have some directive significance to design method of lubricating oil system.     

Combined Network Model for Occupant Evacuation in Building Fires

Safe evacuation is the most fundamental requirement of fire safety measures in buildings. Many computer based evacuation models have been developed to quantify and model human movement in the buildings. Two methods are usually used to represent the building enclosure in these models: fine and coarse networks. This paper presents a fine network model and a coarse network model based on these methods respectively, and develops an integrated network model that integrates both network methods for efficient and detailed assessment of evacuation in large and complex buildings. To demonstrate the advantages of using the integrated network model, the results of its simulation for a high rise office building and a large shopping mall are discussed and compared to the simulation results of the fine network model and the coarse network model. It shows that the integrated model can be used to simulate evacuation in large and complex building and is adequate in representing details of the evacuation process.      

Building Model of Road Roughness

The input model of road roughness is one key element in the study of comfortable performance of vehicle. A model of road roughness, named Partial Wave Adding model, is theoretically analyzed and studied in detail. Based on the mathematical model, digital simulation of road roughness is studied. The simulation results show that the model is an easily actualized model and has universal adaptability.     

COTGROW：棉花生长发育模拟模型

ＣＯＴＧＲＯＷ模型是应用作物模型的理论和方法，借鉴国外同类模型的经验，在多年田间试验研究的基础上，根据中国棉花生产管理的实际，研制完成的一个融棉花生长发育与产量形成及常规栽培管理为一体的动态模拟模型。该模型的核心部分由碳素平衡、发育与形态发生、水分平衡、氨六平衡、栽培措施和输入与输出等模块构成，可根据土壤和气候数据模拟播种期、密度、地膜覆盖、去早蕾、打顶、喷缩节安、喷乙烯利、灌溉和施肥等单个或组合措施条件下的棉花生长发育、产量和品质形成，还可模拟２ｍ上层内各上层的土壤水分状况、氮素状况及植株各部分的含氮量和最终棉株对氮、磷、钾的吸收量。利用模型模拟不同栽培措施对棉花产量的影响结果表明，各种措施的产量拟合指数都在０．８５以上；模拟安阳１９８５年至１９９４年不同气候条件下的产量也具有很好的一致性。但模型还需要在其他类型气候和土壤条件下进行检验。     

亚临界丁烷萃取技术及其在食品工业中的应用

对亚临界丁烷萃取技术的概念、基本原理、特点、工艺流程、研究现状及其在食品工业中的应用现状进行了综述,并对亚临界丁烷萃取技术的发展方向及其在食品工业中的应用前景进行了展望。     

Lightning Shielding Simulation Model of Transmission Line

Transmission lines are easily hit by lightning, and lightning shielding failure is an important reason of lightning accidents of transmission line. So researches on lightning shielding of transmission line should be strengthened. On the basis of the abundant understand to known lightning shielding models of transmission line, a new lightning shielding simulation model of transmission line is presented in the paper. In this model, the effect of attracting lightning of upward leader is considered reasonably, and the method of variable descending step is adopted to simulate the descending process of lightning leader. The simulation calculating results show that the model is in good agreement with field experience of transmission line. It can guide lightning shielding design of transmission line and estimate the performance of lightning shielding of transmission line.     

Parameter Design for the Power Train and Simulation of the Dynamic Performance of Elctrical Vehicle

The method and principle of the parameter design for the power train of EV is explored and discussed,then the parametersof EV. based on SC7101 are reasonably selected.The method of calculating the SOC of Lead_acid battery is provided and the relation among the electromotive force,the interior resistance, the polarized resistance and the SOC are analyzed. The capacity is compensated according to the relation between the capacity and the temperature, which is the basis on which the energy management system is designed and improved. The dynamic model which reflects the dynamic characteristics of the power train is established,then the dynamic performance of the EV based on SC7101 is simulated, and the factors that affect the continuous mileage of EV are analyzed,the measures to increase the continuous mileage are provided.The result shows that the analysis of the electric characteristics of battery and the dynamic model are correct,and the dynamic performance perfectly meets the need of the design target.     

Microscopic Traffic Simulation Mathematic Model Based on Cellular Automata

This paper presents a model for freeway traffic flow simulation and prediction. The model uses cellular automation theory to model complex traffic behavior. The advantage of the cellular automata approach is that the roadway to be modeled is quantized into simple homogeneous cells, time is quanitzed into discrete steps, and physical quantities take on a finite set of values. Also, the state of the cells is updated at each discrete timestep by using a vehicle update algorithm that combines a few vehicle motion models, governed by a relatively small set of parameters. Then vehicles just move one or several cells at each discrete timestep according to the self-defined rule. This approach makes the computer operation feasible. At last, the paper puts forward a suppose that if the simulation system is equiped with the self-study system of NN (neural network) module according to the statistical data from the transducer fixed on the freeway, it can predict the traffic status ahead of 10 minutes.     

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。     

水稻叶色变化动态的模拟模型研究

定量描述叶片颜色变化的动态过程是植物生长数字化和可视化的重要内容。本研究通过对不同水稻品种和不同水氮处理条件下主茎和分蘖不同叶位叶色变化过程的连续观测和定量分析，构建了水稻叶片颜色随生长度日变化的动态模拟模型。水稻叶片颜色变化的基本过程可以用3个阶段的SPAD值分别表达，第一阶段为基于幂函数的伸长期，叶色逐渐增强，第二阶段为相对稳定的功能期，叶色基本不变，第三阶段为基于二次曲线的衰老期，叶色逐渐减弱；并基于二次曲线方程分别描述了叶片含氮量和含水量对叶色变化过程的调控效应。在此基础上，进一步建立了叶片SPAD值与叶色组分（RGB）值的关系模型。利用独立的水稻田间试验资料对所建模型进行了测试和检验，显示主茎不同叶位叶色变化3个阶段模拟值的均方根差分别为2.58、3.69和3.82，4个分蘖不同叶位叶色变化模拟值的均方根差分别为4.65、4.39、3.51和4.25；SPAD值与叶色组分间模拟值的均方根差分别为2.98和3.25。表明本模型可较好地模拟不同生长条件下水稻不同茎蘖上不同叶位叶色的动态变化过程，从而为实现水稻生长系统的数字化模拟和可视化显示奠定了基础。     

The Model of Water and Steam to Real-time Simulation for Supercritical Fossil Power Unit

Based on the general thermodynamic theory,a mathematical model for thermodynamic parameters of hot-shot steam is derived,it includes the formula of specific enthalpy,specific volume,specific heat at constant pressure and specific entropy.The specific enthalpy formula of steam with a pressure range from 0 MPa to 90 MPa and the specific volume formula of steam with a pressure range from 0 MPa to 40 MPa within permission error of the International Steam Skeleton Tables in 1985,and that all the model with a temperature range from 273.15 K to 1 073.15 K.The model is applied to real-time simulation for supercritical fossil power unit and convenience in application of engineering.