用图论法进行结构振动控制的极点配置

本文介绍了用图论法进行结构振动控制极点配置的方法。控制结构振动的实质就是改善结构振动的频率和阻尼即结构的极点。通过求解特征多项式可以得到结构的极点。而特征多项式的系数与有向图的圆族有着密切的关系。本文利用这种关系,根据结构矩阵的有向图中不同宽度的圆族,对给定的结构极点进行配置,求出反馈增益,最后,给出了一个数值例子,以说明文中介绍的方法。     

ON HYPER-ORDER OF MEROMORPHIC SOLUTIONS OF FIRST-ORDER ALGEBRAIC DIFFERENTIAL EQUATIONS

IllltllodOCt1Oll In this paper,the standard notations of＊theons Ne、nllnna clieory will be emp1Oyed．hand fare n。romorPhlc flnctlons·Let A（h）and A（可）denote resPectively the。Ponents ofconvergenceof tile zeros and the poles of h．Let n（r,＿,f）del。ote the。umber of dlst．ct roots of f（z）＝w。ill｛zHzl＜,｝．As we know,in light ofNe侧llnlla theors［’］,the rate ofgrowth ofmeromorPhlcfunction h can be characterized by order。（h）of h,which Is defined as 1＿＿＋,,,I＿…     

非接触圆筒形推拉式磁偶合联轴器的磁力矩公式的推理及其分析

本文对圆筒形推拉式磁偶合器的磁力矩 ,进行了推导 ,对推导结果进行了分析。     

二阶耦合广义系统的极点配置问题

讨论了Hilbert空间中二阶耦合广义系统的极点配置问题,应用算子的广义逆给出了问题的解及解的构造性表达式。     

Surface orientation characterisation of rough mc‐silicon surfaces by confocal microscopy and EBSD

For many semiconductor and photovoltaic applications the quality of substrate surfaces is an important requirement for the development of new devices. Therefore, methods are needed to analyse the surface structure in detail. In the following a new method is described that allows a fast analysis of as‐cut or artificially modified and textured surfaces. It uses laser confocal microscopy images. Therefrom the orientation of small surface elements are detected and depicted in an orientation distribution function of surface normals. The method is applied to as‐sawn mc‐silicon surfaces. It will be shown that it is also possible to determine the grain orientation for grains near 〈111〉 crystal direction by this method. The combination of electron backscatter diffraction and orientation distribution function analysis enables the detailed investigation of surface elements of an anisotropic etched silicon wafer. Inhomogeneity of surface textures can easily and rapidly be visualised by this method. Copyright © 2012 John Wiley & Sons, Ltd.     

Heaviside公式的一种改进

针对一般积分变换教材中Heaviside公式的形式不容易被记忆和理解的情况,运用复变函数的相关知识对Heaviside公式的形式做进一步改进和说明.     

Pole placement problem for singular systems

In this paper the pole placement problem for singular systems via state feedback is studied. We give a complete solution to this problem for systems without row minimal indices. As a corollary, the eigenvalue assignment problem is solved for singular systems in the case they are regularizable. Copyright © 2009 John Wiley & Sons, Ltd.     

局部对称流形上的数量曲率

本文讨论了无共轭点测地线上的Ｊａｃｏｂｉ声，证明了具非负数量曲率的局部对称的无共轭点流形及具非负数量曲率的具极点的局部对称的流形之数量曲率只能是零。部分解决了Ｅ．Ｈｏｐｆ猜想。     

LMI Approach to Output Feedback Control for Linear Uncertain Systems with D-Stability Constraints

This paper deals with the problem of designing output feedback controllers for linear uncertain continuous-time and discrete-time systems with circular pole constraints. The uncertainty is assumed to be norm bounded and enters into both the system state and input matrices. We focus on the design of a dynamic output feedback controller that, for all admissible parameter uncertainties, assigns all the closed-loop poles inside a specified disk. It is shown that the problem addressed can be recast as a convex optimization problem characterized by linear matrix inequalities (LMI); therefore, an LMI approach is developed to derive the necessary and sufficient conditions for the existence of all desired dynamic output feedback controllers that achieve the specified circular pole constraints. An effective design procedure for the expected controllers is also presented. Finally, a numerical example is provided to show the usefulness and applicability of the present approach.