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2016 Seventh International Conference on Intelligent Control and Information Processing (ICICIP)最新文献

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Online calibration of spark advance for combustion phase control of gasoline SI engines 汽油机燃烧相位控制火花提前在线标定
Jinwu Gao, T. Shen
Calibration in combustion phase control is an effective way to get sophisticated engine performance, but is only workable by analyzing offline data or running engine in test mode. When engine is aged or runs at unfamiliar situations, traditional calibration method cannot promise the same performance as before. To improve calibration technique, an online calibration method for combustion phase control is presented, which also works when engine is running in driving operating condition. Based on bilinear interpolation algorithm, online calibration problem is converted to parameters estimation issue, then stochastic gradient descent algorithm is utilized to estimate parameters by iteratively updates. Finally, the proposed strategy is verified on a gasoline spark ignition engine.
燃烧相位控制中的标定是获得发动机精密性能的有效手段,但只有通过离线数据分析或发动机在测试模式下运行才能实现。当发动机老化或在不熟悉的环境下运行时,传统的标定方法无法保证发动机的性能。为了改进标定技术,提出了一种燃烧相位控制在线标定方法,该方法在发动机行驶工况下也适用。在双线性插值算法的基础上,将在线标定问题转化为参数估计问题,然后利用随机梯度下降算法迭代更新估计参数。最后,在汽油火花点火发动机上对该策略进行了验证。
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引用次数: 0
Stability analysis for a class of jump-diffusion systems with parameter 一类带参数跳跃扩散系统的稳定性分析
Hua Yang, Jianguo Liu, Feng Jiang
Stochastic jump systems have great potential in finance engineering and stochastic control. In this paper, we mainly consider stability of stochastic jump-diffusion systems with parameter. We establish the criteria of locally exponential stability of mild solutions of the systems by using stochastic integral inequalities technique. We extend some existing results to more general cases. Finally, we use an example to show our result.
随机跳跃系统在金融工程和随机控制中具有很大的应用潜力。本文主要研究带参数的随机跳跃扩散系统的稳定性问题。利用随机积分不等式技术,建立了系统温和解的局部指数稳定性判据。我们将一些现有的结果推广到更一般的情况。最后,我们用一个例子来展示我们的结果。
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引用次数: 0
Experimental evaluation of a density kernel in clustering 聚类中密度核的实验评价
Jian Hou, Hongxia Cui
The recently proposed clustering algorithm based on density peaks is reported to generate very good clustering results. This algorithm is simple and efficient, and can be used to generate clusters of arbitrary shapes. However, the performance of this algorithm relies on the selection of the kernel in local density calculation. The original density peak based algorithm uses the cutoff kernel and Gaussian kernel to calculate the local density, and the clustering results are found to be influenced by the cutoff distance, which can only be determined empirically so far. In this paper we use a different kernel in density calculation, and evaluate the influence of related parameter on the clustering results. Our work is helpful in understanding the clustering mechanism of this algorithm.
最近提出的一种基于密度峰的聚类算法得到了很好的聚类结果。该算法简单有效,可用于生成任意形状的聚类。然而,该算法的性能依赖于局部密度计算中核的选择。原始的基于密度峰值的算法采用截断核和高斯核计算局部密度,发现聚类结果受到截断距离的影响,目前只能凭经验确定。本文在密度计算中使用了不同的核,并评价了相关参数对聚类结果的影响。我们的工作有助于理解该算法的聚类机制。
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引用次数: 6
Study on a density peak based clustering algorithm 一种基于密度峰值的聚类算法研究
Wei-Xue Liu, Jian Hou
The density peak based clustering algorithm is a recently proposed clustering approach. It uses the local density of each data and the distance to the nearest neighbor with higher density to isolate and identify the cluster centers. After the cluster centers are identified, the other data are assigned labels equaling to those of their nearest neighbors with higher density. This algorithm is simple and efficient. On condition that the cluster centers are identified correctly, it can generate very good clustering results. However, the results of this algorithm depend on a parameter in the local density calculation. In this paper we investigate the influence of the parameter on the clustering results through extensive experiments on several datasets. Our work can be useful in applying the density peak based clustering algorithm to practical tasks.
基于密度峰的聚类算法是近年来提出的一种聚类方法。它利用每个数据的局部密度和到密度较高的最近邻居的距离来隔离和识别聚类中心。在识别出集群中心后,其他数据被分配到与其密度更高的最近邻居相同的标签。该算法简单、高效。在正确识别聚类中心的前提下,可以得到很好的聚类结果。然而,该算法的结果依赖于局部密度计算中的一个参数。本文通过对多个数据集的大量实验,研究了参数对聚类结果的影响。我们的工作对于将基于密度峰的聚类算法应用到实际任务中是有用的。
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引用次数: 4
A novel intelligent particle filter for process monitoring 一种用于过程监测的新型智能粒子滤波器
Chengyuan Sun, Jian Hou, Aihua Zhang, Zhiyong She
Particle filter (PF) serves as an effective method applied to the fault diagnosis of nonlinear and non-Gaussian systems. However, the result of state estimation is influenced by the particle impoverishment problem which is common in the typical PF algorithm. Based on the analysis of the PF algorithm, the general particle impoverishment problem is attributed to the deficiency of particle diversity. In this paper a novel intelligent particle filter (NIPF) is designed to deal with the problem of particle impoverishment by means of the genetic and adaptive strategy. The general PF can be regarded as a particular instance of NIPF. The experiment on the vertically falling body model shows that the NIPF can increase the particles diversity and improve the results of state estimation.
粒子滤波(PF)是一种用于非线性非高斯系统故障诊断的有效方法。但典型的粒子穷化算法存在粒子贫化问题,影响了状态估计的结果。通过对PF算法的分析,将粒子贫困化问题归结为粒子多样性的不足。本文采用遗传和自适应策略设计了一种新型的智能粒子滤波器来处理粒子贫困化问题。一般PF可视为NIPF的一个特殊实例。在垂直落体模型上的实验表明,NIPF可以增加粒子的多样性,改善状态估计的结果。
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引用次数: 1
SVD and statistic theory based modified TPLS 基于SVD和统计理论的改进TPLS
Ao Chen, Honpeng Zhou, Jian Jiao, Tianyi Gao
Modern industrial system is becoming more and more complex in order to produce the goods with high quality or achieve the functional requirements set by human beings. However, once the faults occur in the system, it's highly possible that the financial losses and even the operators' death may be caused. Therefore, it's necessary to improve the reliability of the system. The data-based fault diagnosis scheme is an important approach to realize the fault-tolerant control to further secure the system operation in the normal condition. This paper concentrates on the multivariate statistical analyses included in the framework of data-based scheme, more specifically, Total Projection to Latent Structures (TPLS). Although the traditional TPLS has achieved effective monitoring results in some practical applications, it should be noted that the decomposition principle of process variables is not appropriate. Furthermore, the test statistic it chooses can not reflect the subspaces they monitored. Both of the weaknesses make TPLS useless in some circumstances. To solve the problems, this paper proposes a Modified TPLS (MTPLS) based on TPLS, statistics theory and matrix analysis. Compared with TPLS, MTPLS has better fault diagnosis performance. A numerical example is used to validate the effectiveness of TPLS.
为了生产出高质量的产品或实现人类设定的功能要求,现代工业系统正变得越来越复杂。然而,一旦系统出现故障,极有可能造成经济损失甚至操作人员死亡。因此,有必要提高系统的可靠性。基于数据的故障诊断方案是实现系统容错控制,进一步保障系统正常运行的重要途径。本文重点研究了基于数据的方案框架中的多元统计分析,更具体地说,是对潜在结构的总投影(TPLS)。传统的TPLS虽然在一些实际应用中取得了有效的监测效果,但需要注意的是,过程变量的分解原理并不合适。此外,它选择的测试统计量不能反映它们监视的子空间。这两个弱点使得TPLS在某些情况下毫无用处。为了解决这些问题,本文提出了一种基于TPLS、统计理论和矩阵分析的改进TPLS (MTPLS)。与TPLS相比,MTPLS具有更好的故障诊断性能。通过数值算例验证了TPLS的有效性。
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引用次数: 0
A novel control approach for piecewise-affine systems with quantization in both measurement outputs and control inputs 一种测量输出和控制输入均量化的分段仿射系统控制新方法
Junnan Shen, Zepeng Ning, B. Cai, Rui Han, Lixian Zhang
The paper addresses the design problem of piecewise-affine output-feedback controllers for a family of piecewise-affine systems against signal quantization. The quantization is considered to occur in both measurement outputs and control inputs. By constructing a novel quantization-dependent Lyapunov function, the stability and H∞ performance criteria are developed for the closed-loop system with the usage of S-procedure that involves the region partition information. Then, the desired controller gains are obtained in order to guarantee that the resulting closed-loop control system is asymptotically stable with a guaranteed H∞ performance index. Finally, a numerical example is provided to show the effectiveness of the proposed control method.
针对一类分段仿射系统的信号量化问题,研究了分段仿射输出反馈控制器的设计问题。量化被认为发生在测量输出和控制输入。通过构造一种新的量化相关Lyapunov函数,利用涉及区域划分信息的s过程,建立了闭环系统的稳定性和H∞性能准则。然后,得到所需的控制器增益,以保证闭环控制系统渐近稳定,并保证H∞性能指标。最后,通过数值算例验证了所提控制方法的有效性。
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引用次数: 7
Adaptive neural control of nonstrict system with output constriant 输出约束非严格系统的自适应神经控制
Lijie Wang, Qi Zhou, A. Zhang, Hongyi Li
This paper focuses on adaptive neural control for nonlinear system in nonstrict feedback form in the presence of output constraint. Since the backstepping control can not be directly employed to nonstrict feedback structure during controller design. Using the variable separation method, the above obstacle has been overcome. Then, by utilizing barrier Lyapunov function, the issue of output constraint is handled. Combing neural networks (NNs) with the adaptive backstepping technique, it is not only guaranteed that all variables remain bounded in the closed-loop system, but the tracking error is made around the zero with an adjustable small neighborhood. A numerical simulation is provided to demonstrate the control scheme.
研究了存在输出约束的非严格反馈非线性系统的自适应神经控制问题。由于在控制器设计中不能将反步控制直接应用于非严格反馈结构。采用变量分离方法,克服了上述障碍。然后,利用barrier Lyapunov函数处理输出约束问题。将神经网络与自适应反演技术相结合,既保证了闭环系统中所有变量保持有界,又使跟踪误差在零点附近以可调的小邻域进行跟踪。通过数值仿真验证了该控制方案。
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引用次数: 0
Predicting world coordinates of pixels in RGB images using Convolutional Neural Network for camera relocalization 基于卷积神经网络的RGB图像像素世界坐标预测
Jian Wu, Liwei Ma, Xiaolin Hu
Convolutional Neural Networks (CNNs) have achieved great successes in many computer vision tasks and have been applied to pose regression for camera relocalization. Traditional Simultaneously Localization and Mapping (SLAM) approaches use correspondences between camera coordinates and world coordinates to estimate camera pose. In this paper, we present a new camera relocalization method including pixels' world coordinates regression with CNNs and camera pose optimization. We also explore the different characteristics of CNNs and SCoRe Forests on world coordinates regression. Experiments show that our approach has larger camera relocalization error but better performance on predicting world coordinates of pixels compared to SCoRe Forests.
卷积神经网络(cnn)在许多计算机视觉任务中取得了巨大的成功,并已被应用于相机重新定位的姿态回归。传统的同步定位和映射(SLAM)方法使用相机坐标和世界坐标之间的对应关系来估计相机姿态。本文提出了一种基于cnn的像素世界坐标回归和摄像机姿态优化的摄像机重新定位方法。我们还探讨了cnn和SCoRe Forests在世界坐标回归上的不同特征。实验表明,与SCoRe Forests相比,我们的方法具有更大的相机重新定位误差,但在预测像素的世界坐标方面具有更好的性能。
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引用次数: 1
An intelligent particle filter for state estimation and fault detection 一种用于状态估计和故障检测的智能粒子滤波器
Chengyuan Sun, Jian Hou, Aihua Zhang, Zhiyong She
With the continuous development of computer science and control science, the complexity of the system also increased rapidly. Accordingly, people began to improve the security and stability of the systems, and fault diagnosis in time is an effectively method to reduce the loss of property. The reality systems are invariably more complex, nonlinear and non-Gaussian. The previous method cannot solve the problem very well. However, as an unique technology, the particle filter (PF) can apply to nonlinear and non-Gaussian systems effectively. The accuracy of state estimation is influenced by the particle impoverishment problem in the quintessential PF algorithm. In order to deal with the particle impoverishment, we propose an intelligent particle filter (IPF) algorithm which based on genetic algorithm optimization after analyzed the particle filter algorithm. The common PF is a special circumstances of IPF that relieves the particular parameters. Results of these two experimental applications of the IPF are given to illustrate it can increase the particles diversity and improve the state estimation results of fault diagnosis.
随着计算机科学和控制科学的不断发展,系统的复杂性也迅速增加。因此,人们开始提高系统的安全性和稳定性,而及时诊断故障是减少财产损失的有效方法。现实系统总是更加复杂、非线性和非高斯的。以前的方法不能很好地解决问题。然而,粒子滤波作为一种独特的技术,可以有效地应用于非线性和非高斯系统。典型PF算法中存在粒子贫困化问题,影响状态估计的精度。在对粒子滤波算法进行分析的基础上,提出了一种基于遗传算法优化的智能粒子滤波(IPF)算法来解决粒子贫化问题。公共PF是缓解特定参数的特殊情况下的IPF。给出了两个IPF的实验应用结果,说明IPF可以增加粒子的多样性,改善故障诊断的状态估计结果。
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引用次数: 1
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2016 Seventh International Conference on Intelligent Control and Information Processing (ICICIP)
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