单线阵CCD系统的表面凹坑缺陷检测方法

为解决表面凹坑缺陷与其他平面表面缺陷同时在线检测的问题,提出一种基于单线阵CCD系统进行表面凹坑缺陷检测的方法.根据光辐射照射模型和相机成像模型,建立了基于单线阵CCD的凹坑检测数学模型,由模型推导出图像像素灰度与凹坑深度的关系,利用特定光源和光照角度的关系,进行表面凹坑缺陷的检测.结果表明,由于凹坑边缘部位深度的渐变引起CCD输出电压信号的渐变,凹坑图像呈现边缘像素灰度渐变现象,且随光源光照角度的降低,凹坑图像特征更加突出.边缘灰度渐变的图像特征成为凹坑缺陷与其他平面缺陷相区别的重要特征,有利于凹坑缺陷的检测与识别.

室内线阵CCD交汇测量系统研究

针对现有测试设备无法解决室内大靶面高精度立靶坐标的测试问题,提出了采用线阵CCD交汇测量与人工光源相结合的测量方法.分析了探测光幕的形成及CCD的灵敏度,提出以波长为680 nm的高亮度LED作为发光器件,通过对LED阵列光能量分布的计算,设计了П形线光源的结构参数.实弹测试结果表明:设计的П形线光源满足线阵CCD交汇测量系统的背景照明要求,室内线阵CCD交汇测量系统能够可靠捕获弹丸,坐标测量误差小于10mm,扩展了线阵CCD交汇测量系统的应用范围.

DSP在线阵CCD测量系统中的应用

本文介绍一种基于数字信号处理器(DSP)技术的线阵CCD测量系统。该系统主要包括:线阵CCD传感器、DSP处理器、显示模块及控制电路等4个部分阐述了CCD光采集工作原理和系统工作原理,介绍了DSP硬件设计及软件设计。

DSP在线阵CCD测量系统中的应用

介绍一种基于DSP技术的线阵CCD测量系统。该系统主要包括:线阵CCD传感器、DSP、显示模块及控制电路等四个部分。在讲述CCD光采集工作原理和系统工作原理之后,介绍DSP硬件设计,最后对DSP处理器软件设计进行陈述。

CCD非接触式测径系统的设计及误差分析

线阵CCD是一种新型的光电传感器件,它在实时测量方面有着广泛的应用,本文介绍一种CCD非接触式测径系统的原理及系统的组成,并在此基础上讨论了采用线阵CCD作为光电转换器件在实时测量物体时的系统误差,进而提出减少这些误差的措施。

AD976的工作原理及其在线阵CCD系统中的应用

分析了高分辨率 16位A D转换器AD976的特性、工作原理 .应用AD976设计一套适合线阵CCD的高速数据采集系统 .根据线阵CCD的输出特点 ,设定AD976工作于R C控制转换模式 ,对CCD输出的模拟电荷信号进行同步采样 ,以提高光谱分析仪的分辩率 .应用表明 :系统有较高的测量精度 ,特别适用于瞬态过程的光谱分析 .

基于DSP的线阵CCD测量系统

文章介绍了一种基于DSP技术的线阵CCD测量系统。在讲述了CCD光采集和ADC的工作原理之后 ,结合DMA技术 ,以TMS32 0VC5 410为例 ,介绍了DSP存储器双缓冲区工作原理及其在线性CCD测量系统中的应用。

高帧率彩色线阵CCD实时成像系统的设计探究

针对高帧率彩色线阵CCD实时成像系统设计,阐述系统设计要求与方案,总结最终系统成像效果,明确系统设计的要点,以期能够改善传统成像系统存在的不足,进而提高成像质量的完整性与清晰度.

A Decorrelating DOA Estimation Based on the Principal Eigenvector for CDMA Frequency-Selective Fading Channels

A novel decorrelating DOA estimation algorithm of multipath signals for CDMA frequency selective fading channels based only on the principal eigenvector of its corresponding covariance matrix is proposed. The proposed algorithm has the advantages that the DOAs of the multipath signals can be estimated independently and all the other resolved multipath signal interference is eliminated. Simulation results show that this algorithm estimates the DOAs of multipath signals efficiently and accurately.

STABILITY ANALYSIS AND COOPERATIVE CONTROL OF DISTRIBUTED MULTI-AGENT SYSTEM WITH SAMPLED COMMUNICATION

The cooperative control and stability analysis problems for the multi-agent system with sampled com- munication are investigated. Distributed state feedback controllers are adopted for the cooperation of networked agents. A theorem in the form of linear matrix inequalities（LMI） is derived to analyze the system stability. An- other theorem in the form of optimization problem subject to LMI constraints is proposed to design the controller, and then the algorithm is presented. The simulation results verify the validity and the effectiveness of the pro- posed approach.

Improved delay-dependent stability criteria for stochastic systems with time-varying interval delay

The problem of the stability for a class of stochastic systems with time-varying interval delay and the norm-bounded uncertainty is investigated. Utilizing the information of both the lower and the upper bounds of the interval time-varying delay, a novel Lyapunov-Krasovskii functional is constructed. The delay-dependent sufficient criteria are derived in terms of linear matrix inequalities （LMIs）, which can be easily checked by the LMI in the Matlab toolbox. Based on the Jensen integral inequality, neither model transformations nor bounding techniques for cross terms is employed, so the derived criteria are less conservative than the existing results. Meanwhile, the computational complexity of the obtained stability conditions is reduced because no redundant matrix is introduced. A numerical example is given to show the effectiveness and the benefits of the proposed method.

Input-output approach to robust stability and stabilization for uncertain singular systems with time-varying discrete and distributed delays

Based on input-output approach, the robust stability and stabilization problems for uncertain singular systems with time-varying delays are investigated. The parameter uncertainties are assumed to be norm-bounded and the time-varying delays include both discrete delay and distributed delay. By introducing a new input-output model, the time-delay system is embedded in a family of systems with a forward system without time delay and a dynamical feedback uncertainty. A sufficient and necessary condition, which guarantees the system regular, impulse-free and stable for all admissible uncertainties, is obtained. Based on the strict linear matrix inequality, the desired robust state feedback controller is also obtained. Finally, a numerical example is provided to demonstrate the application of the proposed method.

Improved H_∞ control for networked control systems with network-induced delay and packet dropout

The H_∞ performance analysis and controller design for linear networked control systems(NCSs) are presented.The NCSs are considered a linear continuous system with time-varying interval input delay by assuming that the sensor is time-driven and the logic Zero-order-holder(ZOH) and controller are event-driven.Based on this model,the delay interval is divided into two equal subintervals for H_∞ performance analysis.An improved H_∞ stabilization condition is obtained in linear matrix inequalities(LMIs) framework by adequately considering the information about the bounds of the input delay to construct novel Lyapunov–Krasovskii functionals(LKFs).For the purpose of reducing the conservatism of the proposed results,the bounds of the LKFs differential cross terms are properly estimated without introducing any slack matrix variables.Moreover,the H_∞ controller is reasonably designed to guarantee the robust asymptotic stability for the linear NCSs with an H_∞ performance level γ.Numerical simulation examples are included to validate the reduced conservatism and effectiveness of our proposed method.

Robust model predictive control with randomly occurred networked packet loss in industrial cyber physical systems

For a class of linear discrete-time systems that is subject to randomly occurred networked packet loss in industrial cyber physical systems, a novel robust model predictive control method with active compensation mechanism was proposed. The probability distribution of packet loss is described as the Bernoulli distributed white sequences. By using the Lyapunov stability theory, the existing sufficient conditions of the controller are derived from solving a group of linear matrix inequalities. Moreover, dropout-rate with uncertainty and unknown dropout-rate are also considered, which can greatly reduce the conservativeness of the controller. The designed robust model predictive control method not only efficiently eliminates the negative effects of the networked data loss in industrial cyber physical systems but also ensures the stability of closed-loop system. Two examples were provided to illustrate the superiority and effectiveness of the proposed method.

LMI Approach to Mixed H_/H_∞ Fault Detection Observer Design

To investigate the robust fault detection （RFD） observer design for linear uncertain systems, the H_index and H∞ norm are used to describe this observer design as optimization problems. Conditions for the existence of such a fault detection observer are given in terms of matrix inequalities. The solution is obtained by new iterative linear matrix inequality （ILMI） algorithms. The RFD observer design over finite frequency range in which Of does not have full column rank for a system is also considered. Numerical example demonstrates that the designed fault detection observer has high sensitivity to the fault and strong robustness to the unknown input.

A Delay System Approach to Fault Detection Filter of Networked Control Systems

In this paper,the fault detection filter(FDF) design problem for networked control systems(NCSs) with both network-induced delay and data dropout is studied.Based on a new NCSs model proposed recently,an observer-based filter is introduced to be the residual generator and formulated as an H∞-optimization problem for systems with two successive delay components.By applying Lyapunov-Krasovskii approach,a new sufficient condition on stability and H∞ performance is derived for systems with two successive delay components in the state.A solution of the optimization problem is then presented in terms of linear matrix inequality(LMI) formulation,dependently of time delay.In order to detect the fault,the residual evaluation problem is also considered.An illustrative design example is employed to demonstrate the validity of the proposed approach.

Robust Non-fragile PID Controller Design for the Stroke Regulation of Metering Pumps

This job focuses on the stroke regulation of a class of high-precision metering pumps.A parametertuning method of robust non-fragile PID（proportional-integral-derivative）controllers is proposed with the assumption that a PID controller has additive gain perturbations.An H-infinite robust PID controller can be obtained by solving a linear matrix inequality.This approach can guarantee that the closed-loop control systems is asymptotically stable and the H-infinite norm of the transfer function from the disturbance to the output of a controlled system is less than a given constant to attenuate disturbances.The simulation case shows that the control performance of the proposed strategy is significantly better than the traditional PID approach in the situation with perturbations of controller parameters.

Second-Order Consensus of Multiple Agents with Coupling Delay

In this paper, we investigate two kinds of second-order consensus algorithms for multiple agents with coupling delay under general fixed directed information topology. Stability analysis is performed based on Lyapunov- Krasovskii functional method. Delay-dependent asymptotical stability condition in terms of linear matrix inequalities （LMIs） is derived for the second-order consensus algorithm of delayed dynamical networks. Both delay-independent and delay-dependent asymptotical stability conditions in terms of LMIs are derived for the second-order consensus algorithm with information feedback.

BALANCE ROUTING TRAFFIC IN GENERALIZED SHUFFLE-EXCHANGE NETWORK

A methodology is proposed to handle problem that under equiproble address of packet traffic at the input port, Generalized Shuffle-Exchange Network (GSEN) routes traffic unevenly because of the unbalanced routing tags. The idea is to use routing tag according to probability, which can be evaluated by using Moore-Penrose inverse in matrix analysis. An instance is used to illustrate the idea, and the simulation is done to show the improvement in performance issues.

Synchronization criteria based on a general complex dynamical network model

Many complex dynamical networks display synchronization phenomena. We introduce a general complex dynamical network model. The model is equivalent to a simple vector model of adopting the Kronecker product. Some synchronization criteria,including time-variant networks and time-varying networks,are deduced based on Lyapunov's stability theory,and they are proven on the condition of obtaining a certain synchronous solution of an isolated cell. In particular,the inner-coupling matrix directly determines the synchronization of the time-invariant network; while for a time-varying periodic dynamical network,the asymptotic stability of a synchronous solution is determined by a constant matrix which is related to the fundamental solution matrices of the linearization system. Finally,illustrative examples are given to validate the results.