基于S-Function的非线性PID控制器参数设计和优化

介绍了Matlab的S-Function的运行原理、功能和实现方法;简要说明了基于S-Function的非线性PID控制器的方案,对于非线性PID控制器参数优化问题,提出了一种先进方法,即采用MATLAB优化工具箱来优化PID控制器参数;介绍了工具箱的主要特点,并给出了在约束条件下的优化算法。     

一个变系数非线性演化方程的精确解

直接利用扩展F-展开法求出了一个变系数非线性演化方程的更多个以Jacobi椭圆函数表示的精确解.当模数m→1及m→0时,可得到类孤立波解和三角函数表示的精确解.     

遗传算法用于求解非线性方程组

本文采用自适应的遗传算子和自适应选取初始区间等技术,设计了基于实数编码的遗传算法,用于求解非线性方程组(含非线性方程)问题,本文的二个算例获得了较好的结果.     

抽象空间中非线性脉冲积分微分方程解的存在性及其应用

利用严格集压缩映射的不动点定理可以证明Banach空间中混合型非线性积分微分方程解的存在性,并给出了一个具体应用.     

INITIAL AND BOUNDARY PROBLEMS FOR CERTAIN NONLINEAR DEGENERATR PARABOLIC SYSTEMS

In this paper we are concerned with the following nonlinear degenerate parabolic systems u_t=△x(gradψ(u))+D_xb(u)+f(x.t.u)with Dirichlet boundary conditions,where u,gradψ(u),b and f are vector valued functions and xUnder some structure conditions on the terms of the systems,we have established theresults on existence and uniquence of global solutions of the systems.     

一类高阶非线性差分方程的振动性

本文主要研究下列高阶非线性差分方程解的性质:Xn+1=Xn/f(X,Xn-1,…，Xn-k)Xn-k-1,n=0,1,2,…,(*)其中函数f某些假设,k∈{0,1,2,…}.得到了方程(*)严格振动的充分条件,环长以及环上极值位置.一些已知的结果被改进和推广.     

Internal Force Analysis Due to the Supporting Translation in Statically Indeterminate Structures for Different Elastic Modulus

For statically indeterminate structure, the internal force will be changed with the translation of the supports, because the internal force is related to the absolute value of the stiffness EI. When the tension is different with the compression modulus, EI is the function of internal force and is not constant any more that is different from classic mechanics. In the other words, it is a nonlinear problem to calculate the internal force. The expression for neutral axis of the statically indeterminate structure was derived in the paper. The iterative program for nonlinear internal force was compiled. One case study was presented to illustrate the difference between the results using the different modulus theory and the single modulus theory as in classical mechanics. Finally, some reasonable suggestions were made for the different modulus structures.     

非线性耦合Ito系统新精确解的符号计算

利用最近引入的齐次平衡原理与新代数法的思想,借助于计算机代数系统Maple软件,得到了一个非线性耦合Ito系统的新孤子解、周期解。较以往一些常见的方法而言,该方法简洁而有效。     

Nonlinear model predictive control with guaranteed stability based on pseudolinear neural networks

~~identificationis7-7-1,where3nm==,andtheRPEalgorithmisusedtoupdatetheweightingofPNN.Thewholetrainingprocessuses800iterations.InordertoovercometheinaccuracyofPNNmodel,thecontrollerstructureisacompositeoneasfbff()()()ututut=+,(37)wherefb()utistheoutputoffeedbackcontroller,ff()utistheoutputofpredictivecontrollerdescribedbyEq.(14),with0.20=,0.40=,andmax5K=.Insimulatedclosedloopcontrol,ufb(t)isaproportionalcontroller,fb()()Putket=and5.0Pk=.Theset-pointofthesystemisd0.15,if040,and120()0.24,if4…     

飞秒脉冲在环形腔中传输的最佳色散递减参量

研究了3种不同色散递减类型光纤构成的环形腔对飞秒脉冲传输特性的影响，发现在高阶效应的影响下，色散曲线为高斯递减的光纤构成的光纤环改善了飞秒脉冲的传输特性．