浆纱机监测系统中多道信号采集及动态显示的实现

在浆纱机监测系统中,多道信号采集及数据动态显示是一重要环节。本文以8031CPU为核心,设计并实现了一系统接口,可进行多道模拟信号采样,多路外部脉冲计数,并利用微机系统并行口进行系统接口与微机之间的数据通讯。系统接口中采用的光电隔离技术,使设备地与微机系统地分开,保证了微机系统的完备性。对经过了光电隔离器的模拟信号进行非线性校正,提高了光电隔离器输入输出的传输精度。微机系统上设计的信息动态显示窗口,可及时反映出浆纱过程的主要生产指标及其变化趋势。     

FIR型逆动态内模控制器的设计算法与特性分析

利用受控对象的脉冲响应直接设计一FIR型内模控制器逼近其逆动态,建立了求解控制器系数矢量的矩阵方程并给出了相应的求解算法.分析表明,给出的内模控制器设计算法是绝对收敛的且控制器系数是有界的,从而保证了内模控制系统的闭环稳定性.     

Textile Texture Modeling Using Random Field Models

Described in the paper is the method to fit autoregressive(AR)random field models and Gausslan Markov ran-dom field(GMRF)models for textile textures.Maxi-mum likelihood(ML)estimation schemes and texturesynthesis for these models are presented.Three types oftypical textile textures are tested using the method andsatisfactory results are achieved.     

Eigen-Space Decomposition (ESD) Method for the Design of Internal Model Controller (IMC) from Noisy Input and Output Plant Data

A novel approach to design Internal Model Controller(IMC)is proposed in this paper directly from measuredinput and output plant data,which are assumed to becontaminated by measurement noise.In order to avoidthe complicated structure-identification problem inmost cases,two Finite Impulse Response(FIR)modelsare taken to represent the plant model and the internalmodel controller respectively.Taking account of mea-surement noise both in the plant input and its output,anESD based Total Least Squares(TLS)solution is appliedfor the unbiased identification of the plant model and itsinverse model,the latter constitutes the internal modelcontroller according to the principle that the internalmodel controller approximates the inverse dynamics ofthe plant model.Simulations are given for a testifica-tion.     

纺织品表面纹理的图像分析方法

回顾了用于纺织品表面纹理的图像分析方法,其中着重介绍了纺织品表面纹理特征的描述方法、分析方法和模式分类方法,并以一些常用纺织品为对象,对这些方法的有效性作了比较。     

Fabric Defect Detection Using GMRF Model

It has been testified that the Gauss Markov random field model is most suitable for the characterization of fabric texture among a variety of available models because of its approximately constant character and the normality of the gray-level distribution found with typical fabric images. However, the general Gauss-Markov random field(GMRF) method for fabric defect detection is not always ideal in practice since in some cases, the estimated model parameters make the Markov error covariance not positively definite, which may render the method to fail thoroughly. In this paper, the use of the GMRF model for defect detection of fabric is discussed and an approach to this problem is proposed. Some detailed texture may be overlooked in this way, but good detection results can still be expected as far as fabric defect detection is concerned.     

时间渐消递推最小二乘估计的矩阵QR分解方法

给出了当数据一步更新时,利用矩阵QR分解进行最小二乘估计的直接递推形式。与利用Givens旋转变换进行参数递推估计的方法相比,该方法直接表征了被辨识参数的递推计算关系,因而可直接判定递推估计算法的收敛性。     

基于服装结构的衣片自动推裆算法

尽管服装的款式不一,但其基本的服装结构总是一定的,且其结构框架线也是一定的。本文基于服装结构,应用结构参数增量法,直接计算出相应的结构框架线的增量,进而计算出衣片上各特征关键点的推裆增量,实现了服装衣片的自动推裆计算。给衣片特征关键点附加的入射角与出射角属性,保证了衣片弧线拟合的平滑性。本方法易于实现,有简单适用性较广之特点。     

基于高斯-马尔可夫随机场模型的织物纹理特征参数提取方法

将高斯-马尔可夫随机场用于织物纹理的建模.在估计模型参数时,采用不完全 Cholesky共轭梯度法.获得特征参数后,通过纹理合成方法,仿真原始纹理图像.试验表明:仿真织物纹理图像与真实织物纹理图像具有较为一致的视觉效果,从而论证了高斯-马尔可夫随机场模型对织物纹理建模的有效性.     

一类非最小相位对象的内模预测控制:SISO情形

针对一非最小相位对象,在内模控制结构下,根据预测控制机理来直接优化设计一非因果FIR(有限脉冲响应)型控制器,提出了基于奇异值分解(SVD)的控制器系数估计算法.该控制方法既保留了预测控制滚动优化的特点,又保持了内模控制对偶稳定性的特性,是一种稳定化的预测控制新策略.