Full-order observer-based actuator fault detection and reduced-order observer-based fault reconstruction for a class of uncertain nonlinear systems

This paper considers observer-based actuator fault detection and reconstruction problems for uncertain nonlinear systems. Based on a kind of full-order observer which is robust to disturbances but sensitive to actuator faults, a single detection observer is constructed to produce a residual which can be used to alarm the occurrence of the actuator faults when at least one actuator fault occurs indeed. The full-order observer is adaptive one because an adaptation law which can adjust the Lipschitz constant of Lipschitz term is introduced. For this reason, the Lipschitz constant can be unknown in our design. After this, a kind of reduced-order observer is developed by choosing a special observer gain matrix. Based on the reduced-order observer, we provide a kind of unknown information estimating method which can be used to not only reconstruct the actuator faults but also estimate the disturbances of the system. In simulation, a real model of the seventh-order aircraft is used to illustrate the effectiveness of the proposed methods.     

决策树算法在饰品营销中的应用

阐述了饰品企业营销的现状,提出了将数据挖掘技术应用到饰品营销中的方案.在分析决策树算法的基础上,介绍了决策树算法及决策树的构造,并使用该算法对企业客户进行分类及对新客户类型预测,实现对商业数据中隐藏信息的挖掘,且对该挖掘模型进行了验证.     

中条山胡—蓖型铜矿床成因新认识

讨论了剥离断层与成矿物质来源,矿体空间分布型式以及矿化特征等方面联系,从而提出胡-蓖型铜矿床是一个受剥离断层控制的“热液型(断)层状矿床”。     

Modeling NOx emissions from coal-fired utility boilers using support vector regression with ant colony optimization

Modeling NO_x emissions from coal fired utility boiler is critical to develop a predictive emissions monitoring system (PEMS) and to implement combustion optimization software package for low NO_x combustion. This paper presents an efficient NO_x emissions model based on support vector regression (SVR), and compares its performance with traditional modeling techniques, i.e., back propagation (BPNN) and generalized regression (GRNN) neural networks. A large number of NO_x emissions data from an actual power plant, was employed to train and validate the SVR model as well as two neural networks models. Moreover, an ant colony optimization (ACO) based technique was proposed to select the generalization parameter C and Gaussian kernel parameter γ. The focus is on the predictive accuracy and time response characteristics of the SVR model. Results show that ACO optimization algorithm can automatically obtain the optimal parameters, C and γ, of the SVR model with very high predictive accuracy. The predicted NO_x emissions from the SVR model, by comparing with the BPNN model, were in good agreement with those measured, and were comparable to those estimated from the GRNN model. Time response of establishing the optimum SVR model was in scale of minutes, which is suitable for on-line and real-time modeling NO_x emissions from coal-fired utility boilers.     

A study of the optimal measurement placement for parameter identification of orthotropic composites by the boundary element method

This paper concentrates on the design of the optimal measurement placement for the parameter identification of two-dimensional orthotropic composites, which is modeled by the boundary element. From the analysis of the well-posedness of the parameter identification processes using the Levenberg–Marquardt method, a performance indicator and an estimation of the maximum bias of identified parameters are deduced. Based on these results, a method for selecting the optimal measurement placement is proposed. The validity of this method is illustrated by some numerical examples. These examples reveal that the measurement placement has significant influence on identification results. Furthermore, an iterative process of selecting measurement placement is suggested for practical implementation.     

南京长江第四大桥航行条件数值模拟研究

结合二维水流数学模型和船舶运动数学模型,研究了拟建南京长江第四大桥对通航水流条件的影响,分析了桥墩周围的水流条件变化,模拟了船队在建桥前后通过桥区河段的航迹线,得到了航行过程中的航行参数,综合分析认为南京四桥修建对通航水流条件影响很小,对船舶航行也无明显影响。     

PNX0101及其在便携式MP3播放器中的应用

目前,便携式MP3播放器的发展十分迅速。用户对便携式MP3播放器的音质、体积、功耗等方面提出了越来越高的要求。Philips公司推出的32位ARM+DSP双核结构的PNX0101芯片因其一流的音质表现、更小的尺寸、更小的功耗等特点成为解码芯片领域的热点。本文介绍了PNX0101的结构和特点,分析了它具有竞争力的优异性能,并对基于PNX0101设计的便携式MP3播放器及其电源管理进行了讨论。     

TMS320F206与TLC320AD50C接口电路的设计

介绍了TI公司数字信号处理器TMS320F206的同步串行接口的特点，及∑-△型A／D、D／A转换芯片TLC320AD50C的结构和通信方式，详细叙述了两者的接口电路、软件设计方法。     

DSP和PC机的串行通信设计

以实例介绍了DSP与PC机进行串行接口的软硬件电路，详细说明了利用Visual Basic6．0的MSComm通信控件进行通信的方法以及如何在DSP上用汇编语言实现与PC机的高效通信，并给出了程序流程图和源程序清单。