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给出一种在线频率估计的时域算法.从Hankel矩阵与可控矩阵的隐含关系出发,利用可控矩阵的shift结构,推导出系统矩阵特征根与相关序列的显式关系,从而得到信号频率估计的简单公式.对于二阶系统,或可分解为并联二阶系统的高阶系统,特征频率可由信号分量的相关序列估计得到.对定常系统和时变系统的频率估计进行仿真,结果表明频率估计值可以快速逼近真实值,而且稳态误差小于1%. 相似文献
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ZHANG Yi 《上海交通大学学报(英文版)》2005,10(4):449-455
On the basis of the piezoelectric theory, Mindlin plate theory, viscoelastic theory and ideal fluid equation, the finite element modeling of a fluid-filled cylindrical shell with active constrained layer damping (ACLD) was discussed. Energy methods and Lagrange's equation were used to obtain dynamic equations of the cylindrical shell with ACLD treatments, which was modeled as well with the finite element method. The GHM (Golla-Hughes-McTavish) method was applied to model the frequency dependent damping of viscoelastic material. Ideal and incompressible fluid was considered to establish the dynamic equations of the fluid-filled cylindrical shell with ACLD treatments, Numerical results obtained from the finite element analysis were compared with those from an experiment. The comparison shows that the proposed modeling method is accurate and reliable. 相似文献
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