非线性系统的模糊辨识在线算法

在以往的模糊辨识方法中,均未给出在线调整非线性系统的模糊辨识算法。基于递推模糊聚类方法,提出了一种在线调节模糊模型的辨识算法。为了验证所提出方法的有效性,对几个非线性系统进行了辨识,最后给出了辨识结果。     

THE SELF-STABLE REGION APPROACH FOR SECOND ORDER SYSTEMS

1.IntroductionThecolltrolproblemofnonlinearuncertainsystemshasbeenextensivelyresearchedformanyyears.Manymethodshavebeenproposedandsomeprogresshasbeenmade.[1]poiedsoutthatsomesecondordersystemshaveaninherelltpropertythatthereexistscertainregioninwhichalltrajectoriesofthesystemremaininginitaftercertaintimeTwillconvergetotheorigin.Basedonthisproperty,anewapproachhajsbeenputforwardtoconstructacolltinuousfeedbacklawsuchthatallsystem'strajectoriesmovetowardtheregionandeventuallyremaininit.In[2,3],a…     

An Adaptive Identification and Control Scheme Using Radial Basis Function Networks

1.INTaODUCTIONThemultilayerfeedforwardneuralnetworks(MFNN)hasbeenwidelyappliedinmanyfieldssuchaspatternrecognition,nonlinearoptimization,systemidentificationandcontrol.Thesimpleback-propagation(BP)learningalgorithmisusuallyadoptedtoupdateitsweights.TheBPalgorithm,however,suffersdrawbacksofslowconvergenceandunpredictablesolutionsduringlearning.Althoughmailyapproachessuchasvariablestepsize,conjugategradient,pseudo-Newtonmethods[4]andothermethods[3,10],havebeendevelopedtoovercometheproble…     

非线性退缩抛物型方程组的初边值问题

文中讨论了几类非线性退缩抛物型方程组初边值问题非负解的存在性与唯一性。     

一类非线性抛物型方程的解在有限时刻的爆破性质

本文考虑一类非线性抛物型方程混合问题的解的爆破性质．通过引入爆破因子，证明了这个问题的解在有限时间的爆破．同时，用凸性方法，进一步研究了解的爆破性质，得到了与前人研究互为补充的结果．     

钢筋混凝土柱壳的非线性分析

混凝土受拉开裂及多向压力作用下混凝土的非线性应力－应变关系是产生钢筋混凝土结构非线性反应的两个主要原因，据此建立混凝土破坏的一般准则，用这些准则建立非线性有限元分析的应力－应变增量关系，对于钢筋混凝土构件的有限元分析，文中介绍的方法可以直接考虑钢筋的作用，钢筋和混凝土两种不同材料的应力－应变关系可以分别考虑，便于有限元计算程序的编制。     

用细胞神经网络实现蔡氏混沌电路

研究了用细胞神经网络（ＣＮＮ）实现蔡氏电路的方法，把ＣＮＮ模型与蔡氏电路模型两者联系起来，并且只采用一般常用的运算放大器、电阻和电容即可方便地构成蔡氏电路，试验结果表明，电路原理简明，工作可靠，性能优良，有较大的实用价值。     

非线性位移与井眼轨迹

本文提出了钻头位移量与钻压的α次方成比例的非线性位移模式(其中α>0)。结果表明,利用模式计算钻头合位移,其方向并非总是与合力方向一致。由此得出,决定井眼轨迹的是钻头合位移方向,而不必是合力方向。本文分析了合位移方向的变化规律,导出了判断合位移方向变化的参考锥面及其准线方程。并列出了非线性位移模式的试验结果。     

NONLINEAR ELASTICITY OF BLOOD ARTERIAL DUCT

The paper deals with nonlinear elasticity of blood arterial duct, in which the artery is modeled to bea locally triclinic, transverse isotropic, incorapressible, axisymmetric and thickwalled tube with large deformations, The nonlinear coustitutive relationship of arterial tissues is based on the theorv of Green and Adkins. A nonlinear strain energy density function is introduced for nonlinear stress-strain relationship of second order, in which the coefficient of each term is expressed by means of a Lame’s constant, The elasticity constants are nqcessary to describe such a uonlinear finite strain etastieity of the second order, These constants are determined by means of the stress-strain increment theory.