Multiple robust H∞ controller design using the nonsmooth optimization method

This paper proposes a systematic technique to design multiple robust H_∞ controllers. The proposed technique achieves a desired robust performance objective, which is impossible to achieve with a single robust controller, by dividing the uncertainty set into several subsets and by designing a robust controller to each subset. To achieve this goal with a small number of divisions of the uncertainty set, an optimization problem is formulated. Since the cost function of this optimization problem is not a smooth function, a numerical nonsmooth optimization algorithm is proposed to solve this problem. This method avoids the use of Lyapunov variables, and therefore it leads to a moderate size optimization problem. A numerical example shows that the proposed multiple robust control method can improve the closed‐loop performance when a single robust controller cannot achieve satisfactory performance. Copyright © 2009 John Wiley & Sons, Ltd.     

Dielectric‐coated conducting curvilinear surface electrostatic model for spacecraft charging applications

In this article, free space capacitance of dielectric‐coated conducting curvilinear surfaces is obtained using method of moments (MOM). The surfaces are discretized using triangular subsections. The curvilinear surfaces are represented by quadratic parametric elements. The MOM based on the pulse basis function and point matching is used. The integrand is divided into a regular and a singular part. The regular part of the integral is numerically evaluated by using the Gaussian quadrature algorithm for triangles. The Duffy transformation is used to evaluate the singular part of the integrals. Computed results are given for the capacitance of the dielectric‐coated conducting cylinder of finite axial length and truncated cone, and compared with the previously published results. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010.     

计算机类课程小班教学模式研究

本文阐述了计算机类课程开展小班教学的基本理念,提出小班教学具体实施原则。针对推广小班教学面临的各种障碍,结合国内高校计算机教学实际情况,提出了若干建设性意见与措施方法。     

基于CAN总线星务仿真系统的设计与实现

综合考虑研制成本以及卫星在轨运行的可靠性和安全性,使用PCI1680 CAN总线控制卡作为主控节点,模拟小卫星星务系统.系统采用双总线冗余设计来提高可靠性,根据特定的组帧解帧协议实现遥控/遥测功能,同时具备电压采集和电源控制功能,为小卫星系统提供全面、通用的地面测试和调试环境.     

基于小波滤波背景预测的红外弱小目标检测方法

红外弱小目标检测是红外图像研究领域的热点与难点。有效地从背景中检测出弱小目标对于后续的跟踪、识别工作具有十分重要的意义。针对现有检测方法的不足,提出了一种基于小波滤波背景预测的红外弱小目标检测方法。该方法利用小波滤波去噪的优良特性将目标作为噪声滤除,然后构建近似的前景分布图与背景分布图,最后基于连通体筛选与对比度门限完成弱小目标的提取。采用实测光电图像对该方法进行了验证,结果表明,提出的方法能够有效抑制噪声,完成背景预测以及红外弱小目标的检测。     

Robust admissibility and admissibilisation of uncertain discrete singular time-delay systems

This paper is concerned with the characterisation of robust admissibility and admissibilisation for uncertain discrete-time singular system with interval time-varying delay. Considering the norm-bounded uncertainty and the interval time-varying delay, a new comparison model is introduced to transform the original singular system into two connected subsystems. After this transformation, a singular system without uncertainty and delay can be handled by the Lyapunov–Krasovskii functional method. By virtue of the scaled small gain theorem, an admissibility condition of the original singular system is proposed in terms of linear matrix inequalities. Moreover, the problem of robust admissibilisation of uncertain discrete singular time-varying system is also studied by iterative linear matrix inequality algorithm with initial condition optimisation. Several numerical examples are used to illustrate that the results are less conservative than existing ones.     

一款模拟昆虫飞行方式的微小型扑翼机

设计了一款模拟昆虫飞行方式的微小型扑翼机,仿照蜻蜓的两翼,直升机式尾翼,以STC15F2K60S2为主控芯片,应用主流无线模块来完成实现遥控仿生扑翼机的设计与制作,经过实际测试能够满足飞行要求.     

网络适配器静电放电问题分析

提出了网络适配器产品静电放电问题的分析及解决方法,并就器件的寄生电容及寄生电感参数对高速电路的影响进行分析总结,为高频滤波、防护电路的器件选型提供了一定的指导.     

小机车新型试验电源自适应模糊PID控制系统仿真研究

针对小机车传统试验电源系统存在的电压稳定性能差、响应速度慢的问题,提出了一种自适应模糊PID控制的小机车新型试验电源系统。对自适应模糊PID控制器的设计和建模,以及仿真的效果进行了详细的阐述,并进行了系统的鲁棒性分析。同时还将自适应模糊PID控制和传统PID控制进行了对比研究,证明了自适应模糊PID控制的小机车试验电源系统有电压稳定性能好、响应速度快的良好电气特性。     

基于小挠度假设的电容式微型压力传感器模型

在小挠度变形假设的基础上对接触型电容式微型压力传感器进行分析。通过对压力传感器敏感元件硅膜片的弹性分析给出了传感器的模型。传感器的接口电路由ＭＯＳ电流镜和模拟开关构成,该电路具有线性度好和测量增益高的特点,并能有效地消除电路中的寄生电容对测量的影响,大大降低测量噪声。