Application of Feedback Linearization to Tracking and Almost Disturbance Decoupling Control of the AMIRA Ball and Beam System

This paper studies the tracking and almost disturbance decoupling problem of the nonlinear AMIRA ball and beam system based on the feedback linearization approach. The main contribution of this study is to construct a controller, under appropriate conditions, such that the resulting closed-loop system is valid for any initial condition and bounded tracking signal with the following characteristics: input-to-state stability with respect to disturbance inputs and almost disturbance decoupling. Two examples on the almost disturbance decoupling problem, which cannot be solved via Ref. 1, are proposed in this paper exploiting the fact that the tracking and the almost disturbance decoupling performances are easily achieved by our proposed approach.     

线性时滞系统的稳定性和镇定问题

本文讨论了线性时滞系统(?)(t)=Ax(t)+Bx(t-r),给出了系统绝对稳定的充分条件,且直接用系数矩阵描述,并讨论了其受控系统(?)(t)=Ax(t)+Bx(t-r)+Cu(t)的镇定问题。     

用两台及三台装置搜索两个坏硬币的最优化方法

讨论了用给定装置从一堆硬币中用最少次数挑选出其中坏硬币的问题，以ｔｋ表示关于模型Ｎ的一个过程ｔ在ｋ次测试中所能鉴别的最大硬币数，以ｎｋ表示关于模型Ｎ在ｋ次测试中所能临别的最大硬币数。     

具多个非线性反馈项的一般Lurie控制系统的绝对稳定性

本文研究了具多个非线性反馈项的一般Lurie控制系统的绝对稳定性问题,由Lyapunov函数方法,得出了绝对稳定的新的充分必要条件和一些实用的充分条件,这些条件推广了集合稳定性.一个数值例子说明了本文结果的有效性.     

Microscopy of femtoscale structures

Advances in experimental techniques are discussed for the study of long-lived isomers using gammasphere. Spectroscopy of neutron-rich nuclei in the A ∼ 180 region is made possible for the first time via neutron transfer from heavy beams, and long-predicted high-K isomers are observed.     

不确定非线性系统的鲁棒适应H_∞几乎干扰解耦问题

本文研究了带有不确定参数的非线性系统的鲁棒适应 H∞ 控制的几乎干扰解耦问题 .运用改进的加幂积分器技巧与递归设计方法 ,构造性地设计了一种光滑鲁棒动态反馈控制律 ,在保证闭环系统内稳定的基础上 ,使系统达到干扰衰减 .     

一类高阶非线性系统的几乎干扰解耦问题

对于一类高阶下三角形结构的非线性系统内稳几乎干扰解耦问题 ( ADD)的可解性 ,本文按 L2 —L2 p增益 ,使用“加幂积分器”方法 ,没有对系统中的函数作任何增长性条件限制 ,证明了文中非线性系统的ADD问题有一个连续状态反馈解 .并且可以显式解出此连续状态反馈控制器使得干扰对输出的影响可限制到任一精度且保持系统内稳 .     

Effects of a professional solo singer education on auditory and kinesthetic feedback—a longitudinal study of singers'' pitch control

The significance of auditory and kinesthetic feedback to pitch control in singing was described in a previous report of this project for students at the beginning of their professional solo singer education.(1) As it seems reasonable to assume that pitch control can be improved by training, the same students were reinvestigated after 3 years of professional singing education. As in the previous study, the singers sang an ascending and descending triad pattern with and without masking noise in legato and staccato and in a slow and a fast tempo. Fundamental frequency and interval sizes between adjacent tones were determined and compared with their equivalents in the equally tempered tuning. The average deviations from these values were used as estimates of intonation accuracy. Intonation accuracy was reduced by masking noise, by staccato as opposed to legato singing, and by fast as opposed to slow performance. The contribution of the auditory feedback to pitch control was not significantly improved after education, whereas the kinesthetic feedback circuit was improved in slow legato and slow staccato tasks. The results support the assumption that the kinesthetic feedback contributes substantially to intonation accuracy.     

不对称卟啉共价固载于硅基介孔薄膜材料模拟反馈回路的研究

将具有氨基功能团的不对称中位四苯基卟啉以共价嫁接的形式固载于介孔二氧化硅薄膜.当将含有卟啉化合物的介孔薄膜材料置于酸性或碱性溶液中并取出时,卟啉在酸性或碱性环境中的状态会被完整的保存下来,进而实现对具有逻辑记忆功能的反馈回路(Feedback loop)的模拟.这种分子逻辑器件兼具了介孔薄膜材料的优异性质:相对较大的表面积不但有利于输入介质与响应单元更有效地接触,还有益于输入介质的彻底清除,避免其残留下来影响下次逻辑输入;周期性排布的均一孔道结构更加有利于器件的后期加工;高的透过性使得输出(Output)更容易被光学仪器所检测.