共查询到19条相似文献,搜索用时 375 毫秒
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由于目前测试技术的限制,在生产过程中对钢坯内部温度的检测比较困难,为了获得钢坯内部的温度,一些研究人员尝试通过数学模型的方法实现钢坯内部温度分布的软测量模型。本文以步进式加热炉中钢坯温度场分布为应用背景,提出了利用机理建模的方法来实现钢坯内部温度场分布的软测量模型,并且对典型工况进行了仿真,结果表明测量精度完全符合工业应用要求。 相似文献
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温度测量及故障诊断系统的设计 总被引:2,自引:5,他引:2
文章给出了基于数字式温度传感器DS18X20的温度测量系统,并利用模糊原理、在线测量温度等方法进行故障诊断。详细论述系统的组成原理、模糊故障诊断方法、硬件电路和软件设计思想。该系统具有故障在线检测、自诊断、显示故障类型及发出声音报警等功能,在实际应用中取得了很好的效果。 相似文献
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回转窑煅烧带温度控制器的设计与仿真 总被引:1,自引:0,他引:1
针对传统的回转窑煅烧带温度PID控制系统存在温度稳定性差、无法在线调整PID参数等问题,文章提出了一种采用模糊自整定PID参数控制方式设计回转窑煅烧带温度控制器的方案,介绍了该控制器的结构、设计步骤及回转窑煅烧过程系统的建模等,并采用Matlab中的Simulink模糊工具箱对模糊自整定PID温度控制器进行了仿真。仿真结果表明,该控制方法无超调量、调节时间短,能够实现参数的在线自调整。实际应用也证明了该控制方法的优越性。 相似文献
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结合密度聚类和模糊聚类的特点,提出一种基于密度的模糊代表点聚类算法.首先利用密度对数据点成为候选聚类中心点的可能性进行处理,密度越高的点成为聚类中心点的可能性越大;然后利用模糊方法对聚类中心点进行确定;最后通过合并聚类中心点确定最终的聚类中心.所提出算法具有很好的自适应性,能够处理不同形状的聚类问题,无需提前规定聚类个数,能够自动确定真实存在的聚类中心点,可解释性好.通过结合不同聚类方法的优点,最终实现对数据的有效划分.此外,所提出的算法对于聚类数和初始化、处理不同形状的聚类问题以及应对异常值等方面具有较好的鲁棒性.通过在人工数据集和UCI真实数据集上进行实验,表明所提出算法具有较好的聚类性能和广泛的适用性. 相似文献
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提出了一种改进的径向基函数(RBF)神经网络,该神经网络以模糊系统模型为基础。首先利用减法聚类算法确定径向基函数的中心数,然后通过模糊C均值聚类算法优化基函数中心与宽度,最后依据样本数据的聚类结果设计RBF神经网络并进行训练。将该神经网络应用于网球队运动员的竞技状态的预测。仿真结果表明:该算法先进有效、具有较高的精度,用其建立的模型具有较强的实用性。 相似文献
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Yih-Jen Horng Shyi-Ming Chen Yu-Chuan Chang Chia-Hoang Lee 《Fuzzy Systems, IEEE Transactions on》2005,13(2):216-228
In this paper, we extend the work of Kraft et al. to present a new method for fuzzy information retrieval based on fuzzy hierarchical clustering and fuzzy inference techniques. First, we present a fuzzy agglomerative hierarchical clustering algorithm for clustering documents and to get the document cluster centers of document clusters. Then, we present a method to construct fuzzy logic rules based on the document clusters and their document cluster centers. Finally, we apply the constructed fuzzy logic rules to modify the user's query for query expansion and to guide the information retrieval system to retrieve documents relevant to the user's request. The fuzzy logic rules can represent three kinds of fuzzy relationships (i.e., fuzzy positive association relationship, fuzzy specialization relationship and fuzzy generalization relationship) between index terms. The proposed fuzzy information retrieval method is more flexible and more intelligent than the existing methods due to the fact that it can expand users' queries for fuzzy information retrieval in a more effective manner. 相似文献
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Fuzzy c-means clustering with spatial constraints is considered as suitable algorithm for data clustering or data analyzing. But FCM has still lacks enough robustness to employ with noise data, because of its Euclidean distance measure objective function for finding the relationship between the objects. It can only be effective in clustering ‘spherical’ clusters, and it may not give reasonable clustering results for “non-compactly filled” spherical data such as “annular-shaped” data. This paper realized the drawbacks of the general fuzzy c-mean algorithm and it tries to introduce an extended Gaussian version of fuzzy C-means by replacing the Euclidean distance in the original object function of FCM. Firstly, this paper proposes initial kernel version of fuzzy c-means to aim at simplifying its computation and then extended it to extended Gaussian kernel version of fuzzy c-means. It derives an effective method to construct the membership matrix for objects, and it derives a robust method for updating centers from extended Gaussian version of fuzzy C-means. Furthermore, this paper proposes a new prototypes learning method and it obtains initial cluster centers using new mathematical initialization centers for the new effective objective function of fuzzy c-means, so that this paper tries to minimize the iteration of algorithms to obtain more accurate result. Initial experiment will be done with an artificially generated data to show how effectively the new proposed Gaussian version of fuzzy C-means works in obtaining clusters, and then the proposed methods can be implemented to cluster the Wisconsin breast cancer database into two clusters for the classes benign and malignant. To show the effective performance of proposed fuzzy c-means with new initialization of centers of clusters, this work compares the results with results of recent fuzzy c-means algorithm; in addition, it uses Silhouette method to validate the obtained clusters from breast cancer datasets. 相似文献
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模糊C均值聚类用于彩色图像分割具有简单直观,易于实现的特点,但存在聚类性能受中心点初始化影响且计算量大等问题,为此,提出一种自适应模糊C均值分割方法.算法根据人类的视觉特性,参照NBS距离与人类视觉对颜色差别的定量关系,结合具体图像的色彩分布,自动确定初始聚类中心及聚类数目,继而进行模糊C均值聚类.实验表明,该方法无需人为的干预,分割速度快,分割效果跟人的主观视觉感知保持了良好的一致性. 相似文献
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Huan Xie Xin Luo Chao Wang Shijie Liu Xiong Xu Xiaohua Tong 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2016,20(12):4709-4722
This paper proposes an image segmentation approach for multispectral remote sensing imagery based on rival penalized controlled competitive learning (RPCCL) and fuzzy entropy. In this approach, the clustering center component for each band of the image is first chosen based on the fuzzy entropy histogram of the corresponding band of the image. The initial clustering centers are then formed by combining the obtained clustering center components. The number of clusters and the real clustering centers are then determined by the use of the RPCCL method. The advantages of the proposed approach are the appropriate initial cluster centers and the fact that the number of clusters is determined automatically. The results of the experiments showed that without providing the number of clustering centers before the clustering operation, the proposed method can effectively perform an unsupervised segmentation of remote sensing images. 相似文献