RBF-Based Modeling and Predictive Control of

循环流化床锅炉(CFBB)代表了目前清洁燃煤设备的发展方向,但由于其复杂的时延、非线性燃烧特性，导致其燃烧过程的控制操作远比一般锅炉复杂，用常规的控制方法难以实现闭环自动控制。本文采用基于神经网络的非线性预测控制方法对CFBB的控制问题进行研究。由于国内CFBB燃煤品质多变，一个有一定精度、容易计算、并可以实时在线校正的预测模型对于CFBB预测控制系统是极其重要的。本文首先对于可以作为非线性预测控制模型的各种神经网络进行比较，重点讨论基于OLS算法和PLS算法的RBF网络的非线性逼近能力和泛化能力，并对算法参数的选取进行了讨论。通过CFBB仿真平台产生多种训练数据，经过泛化实验，基于PLS算法...The Circulating Fluidized Bed Boiler (CFBB) has the most splendid future among all kinds of coal-burning furnaces. Because of its large time delay and strong nonlinear characters, it is more difficult to be controlled than other normal boilers and the closed loop control in its Combustion Process usually can not be achieved by the normal control methods. Model predictive control (MPC) which is bas...学位：工学硕士院系专业：化学化工学院化学工程与生物工程系_化学工程学号：20033300

Modeling of the combustion process of circulating fluldized bed boiler

针对具有多维非线性和纯滞后特性的循环流化床锅炉燃烧过程,采用基于PLS学习算法和OLS学习算法的径向基函数(RBF)神经网络进行建模研究。首先通过循环流化床锅炉仿真平台产生用于建模实验的网络训练数据和泛化数据,然后分别采用OLS算法和PLS算法进行网络训练和泛化研究,最后讨论了影响建模结果的算法参数及其选取方法,重点讨论了PLS算法的4个网络参数的影响和选取。与基于小波网络的建模实验比较,对具有复杂特性的循环流化床锅炉燃烧过程,采用RBF网络建模在保证建模精度的同时,算法参数的选取也较为方便易行。To get a online dynamic model of the combustion process of Circulating Fluidized Bed(CFB)Boiler which was difficult to be modeling because of its complex characteristics such as non-linear,time-delay,time-variation and multidimensional,the RBF net- work based on the PLS arithmetic and the OLS arithmetic was adopted.The data used as the network training samples and the data used in the generalization test of the network was produced by a CFB Boiler simulation system.The network training and generalization study was done by means of PLS arithmetic and OLS arithmetic individually.The arithmetic parameters,especially the parameters of PLS a- rithmetic were discussed to study their influence and selected methods.Contrasting to the online dynamic model of this process which was credited by the wavelet network,the model put forward in this paper keep the same precision and is more easily to select the pa- rameters in the modeling.福建省科技计划重点项目(2005H044

蔬菜生吃更健康吗

流言：如今，越来越多的人在饮食潮流的引领下，以蔬菜沙拉代替大鱼大肉，将生吃、凉拌代替煎、炸、蒸、煮，他们认为生吃蔬菜不仅能保留更多营养，还能品尝到食物原本的味道。真相：蔬菜可为人体提供膳食纤维、矿物质等多种营养成分，但不同的蔬菜所含营养各不相同，烹调方式也各有差异，不能一概而论