查询词典 fuzzy theory

Applying LMI technique, quadratic stability theory, and H〓 control theory, three methods of robust stability analysis and robust controller design for uncertain fuzzy systems are proposed respectively. Among them, LMI based technique can analyze the uncertainties raised in the premises and in the consequent of fuzzy systems. The resulting stabilizing state feedback controllers have maximum stability margins for both kinds of uncertainties. Quadratic stability theory based approach can apply LMI technique and other methods to design fuzzy controllers. H〓 control theory based design can get H〓 controller with constant disturbance attenuation for each local subsystem. Using the given stability criterion of generalized systems, the robust stability of fuzzy systems can be checked.

其中，基于LMI的方法可分析由模糊系统的前件或后件引起的不确定性，得到的稳定的状态反馈控制器对这两类不确定性具有最大的稳定裕度；基于二次稳定理论的方法可应用LMI技术和其它方法设计模糊控制器；基于H〓控制理论的方法可得到各局部子系统具一定干扰抑制性能的鲁棒H〓控制器，而全局系统的鲁棒稳定性可应用所给出的稳定条件进行检验。

Chapter 4 establishes the theory of convex fuzzy mappings: The concepts, such as Jensen's inequality, positively homogeneous, infimal convolution, right scalar multiplication and convex hull are introduced. The corresponding theorems are demonstrated by using the parametric representations of fuzzy numbers. In anti-fuzzy number space, the conjugate mapping of convex fuzzy mapping is concerned, and convexities of conjugate set and conjugate mapping of convex fuzzy mapping are proved. The notions of subgradient, subdifferential, differential with respect to convex fuzzy mappings are investigated, which provides the basis of the theory of fuzzy extremum problems.

在第4章中，建立了有关凸模糊映射的理论：建立了关于凸模糊映射的Jensen不等式、模糊正齐次映射、凸模糊映射的下卷积、右数乘和凸包等概念，利用模糊数的参数化表示，给出了相应的定理；在反模糊数空间，对凸模糊映射的共轭也作了探讨，证明了凸模糊映射的共轭集合和共轭映射都是凸的；最后对凸模糊映射的次梯度、次微分和微分等概念进行了研究，为模糊极值理论打下了基础。

Based on the existed theory of mareoids and fuzzy matroids, this thesis studies the closed regular fuzzy matroid and its fundamental sequence, the fuzzy base and its algorithm of closed fuzzy matroids, the fuzzy circuit and its algorithm of closed fuzzy matroids and so on. The main contributions of this thesis are as follows: 1 The necessary and sufficient condition of closed regular fuzzy matroid and a property of its fuzzy dual matroid are found by studying some properties of closed regular fuzzy matroid. 2 By studying some properties of fuzzt bases of closed fuzzy matroid, the necessary and sufficient condition of judging fuzzy bases of closed fuzzy matroids and some corollaries are found. In the end, an algorithm of obtaining a fuzzy base is given. 3 By studying some properties of fuzzt circuits of closed fuzzy matroid, some necessary and sufficient conditions of using its fundamental sequence to express fuzzy circuits are found. An algorithm of obtaining a fuzzy circuit is given. 4 By studying the fundamental sequence of closed regular fuzzy matroid, some necessary and sufficient conditions of fundamental sequence of closed regular fuzzy matroid are found.

本文在现有拟阵和模糊拟阵理论的基础上，研究了闭正规模糊拟阵及其基本序列，闭模糊拟阵的模糊基及算法、模糊圈及算法等内容，现分述如下： 1研究了闭正规模糊拟阵的一些性质，得到了闭正规模糊拟阵的充要条件及其模糊对偶拟阵的一个性质； 2研究了闭模糊拟阵模糊基的性质，找到了闭模糊拟阵模糊基的充要条件和几个推论，最后还给出了求模糊基的算法； 3研究了闭模糊拟阵模糊圈的性质，找到了用基本序列来表达模糊圈的几个充要条件，并给出了求模糊圈的算法； 4研究了闭正规模糊拟阵的基本序列，找到了闭正规模糊拟阵的基本序列的几个充要条件。

Fuzzy distance of the theory of fuzzy sets an important component of the fuzzy set theory from the early stage of development, Fuzzy Sets distance has been attracting a large number of the concerns that people use real theory of practice with a non-negative real numbers to measure the distance of fuzzy sets, is through the appropriate transform its alluding to the real axis.

模糊距离是模糊集理论的一个重要组成部分，从模糊集理论发展之初，模糊集的距离一直吸引着众多的关注，人们沿用实数理论中的作法，用一个非负实数来度量模糊集的距离，也就是通过适当的变换将其影射到实数轴上。

This is a highly complex and intercrossing advanced subject, which contains a great deal of knowledge of other subjects, such as mechanics, computer science and engineering, cybernetics and control engineering, electronic engineering, artificial intelligence, signal processing technique, nerve network technique, fuzzy theory and so on.

数字控制系统设计是一门高度综合与交叉的前沿学科，涉及机械学、计算机科学与工程、控制论与控制工程学、电子工程学、人工智能、信号处理技术、传感器技术、神经网络技术、模糊理论等多种学科。

On the basis of considering all kinds of using conditions, reliability analysis model and indicator evaluation system was introduced. Indexes weight was determined scientifically by using comprehensive evaluation obtained from combining a subjective evaluation weight with objective entropy weight. An effective evaluation of reliability level was made by fuzzy theory.

构建了纯电动轿车用异步电机驱动系统的可靠性分析模型，在综合衡量电机驱动系统使用条件的基础上引入可靠性指标评价体系，将主观评价权值同熵权客观权值相结合确定各指标的权重，并采用模糊理论对其可靠性水平作出有效评价。

The LSSVM (Least Square Support Vector Machines) was proposed to construct multi-objective optimization model for CWM concentration and ball mill electric current. MODE (multi-objective differential evolution) based on Pareto optimal concept is used to perform a search for determining the optimum solutions, from which the optimum adjustment mode that could heighten concentration and production benefit of CWM is obtained based on fuzzy theory.

利用最小二乘支持向量机对球磨机电流和水煤浆浓度进行多目标建模，并采用基于Pareto最优概念的多目标微分进化算法，对运行工况进行寻优，然后根据模糊集理论在Pareto解集中求得满意解，获得水煤浆浓度的优化调整方式和提高水煤浆生产效益的策略，用以指导水煤浆优化生产。

The results show that the evaluation results of long-span suspended bridges by fuzzy theory is objective and feasible.

结果表明：基于模糊理论的大跨度悬索桥安全性评价是一种客观、可行的评价方法。

The mean value of work loads on a shaft bearing of swivel and rotary table is determined by basic principles of fuzzy theory, considering the loads' fuzziness and the requirement for reliability.

考虑钻机水龙头和转盘主轴承工作载荷的模糊性及可靠性要求，应用模糊数学基本原理求得平均计算载荷，从而计算出主轴承的模糊可靠性寿命。

Focus on this problem, this thesis combined MATLAB and fuzzy theory, and make optimized confidence design on aluminium foil high speed press polish roller.

针对该问题，采用MATLAB蒙特卡罗法与模糊理论相结合的方法，对铝箔高速压光辊进行可靠性优化设计。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。