历史查询   



 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 
The topological approach offered here ensures some topological results on the structure of pole and zero sets of holomorphic maps of bounded domains in complex manifolds.


Filter pole and zero calculations are described and typical magnitude and delay responses generated.


To avoid that, an improved criterion has been developed where pole and zero displacements are forced to remain bounded.


This may yield important errors in pole and zero locations.


Model features, including pole and zero locations, from 6 normal subjects each tested on 5 consecutive days under 3 input amplitudes and eyes open and closed conditions are presented.

 更多 


 With the development of the modern control theory and microcomputer techniques, the selftuning control of the systems with unknown parameters and stochastic disturbances has aroused considerable theoretical and practical interest in recent years. Many successful applications of Single Input and Single Output (SISO) selftuning regulators and controllers have been made in practical engineering. However, for multivariable systems, especially for the multivariable systms with different dimensions in inputs and... With the development of the modern control theory and microcomputer techniques, the selftuning control of the systems with unknown parameters and stochastic disturbances has aroused considerable theoretical and practical interest in recent years. Many successful applications of Single Input and Single Output (SISO) selftuning regulators and controllers have been made in practical engineering. However, for multivariable systems, especially for the multivariable systms with different dimensions in inputs and outputs and different delays in each loop, Multivariable SelfTuning (MST) control is far from being perfect either in theory or in practice. This paper aims at some problems which have been met in the applica tions of MST control in practical engineering, and presents a Multivarible PoleAssignment SelfTuning (MPAST) control algorithm based on output predictions. This algorithm is a further development of previous algorithms [2, 3, 5, 6], and these algorithms can be considerd as the special cases of the algorithm proposed in this paper. And the proposed algorithm can solve the problems of the stablity, nonminimum phase, stationary offset and ma trix B_0 nonrow full rank of multivariable systems. The controller can deal with the systems with different dimensions in inputs and outputs by choosing properly some column full rank matrix polynomial P (z~(1)). The whole algo rithm consists of three parts: kstep ahead output predictions; closedloop poleassignment; the computing of control signals. The online Recursive LeastSquare (RLS) algorithm is employed to identify the parameters of the predictor, and then the kstep ahead output predictions Y (t+k/t) are cal culated. The problem of poleassignment can be reduced to the solving of a multivariable Diophantine equation, and the necessary 3nd sufficient condition when the equation has solutions is that the matrix polynomial A (z~(1)) and S (z~(1)) are right coprime (the proof is given in Appendix). The controller with prespecified closedloop poles and zero stationary offset can be obtained by stipulating a matrix polynomial T(z~(1)) and including an integrator in the systems. At the end of the paper the computer simulation results are given, illustrating the effectiveness and practicability of this self tuning controller.  本文针对多变量自校正控制在实际应用中存在的问题,提出了基于输出预报的多变量极点配置自校正控制算法。该算法是算法[2,3,5,6]的进一步发展,而这些算法可视为该算法的特例。该算法较好地解决了线性多变量自校正控制中的稳定性、非最小相位、稳态偏差和B_0阵非行满秩等问题。通过适当选取一个列满秩矩阵多项式P(z~()),控制器能够控制输入和输出维数不同的多变量系统。整个控制算法由三部分组成;K步超前输出预报、闭环极点配置和控制信号计算。由递推最小二乘(RLS)算法在线辨识预报器参数,并由此计算K步超前输出预报y~*(t+kt)。极点配置问题归结为求解一个多变量Diophantine方程,而Diophantine方程有解的充分和必要条件是矩阵多项式A(z~(1))和S(z~(1))右互质(证明见附录)。给定一个矩阵多项式T(z~(1))并在系统中包含一个积分器,可以得到具有指定闭环极点和零稳态偏差的自校正控制器。本文最后给出计算机仿真结果,验证算法的有效性和实用性。  This paper describes a selftuning algorithm based on closedloop error transfer function pole and zero placement. As the precision in parameter estimation cannot be easily assured in actual control, the errors in parameter estimation have been considered in a certain quadratic criterion. The adaptive ability of the system is improved. The results of computer simulation and temperature control experiments are satisfactory.  本文研究了一类基于闭环误差传递函数零极点配置的自校正控制算法,针对实际中出现的参数辨识精度不易保证这一问题,提出一种在二次性能指标中兼顾参数辨识精度的自校正控制算法,增强自适应控制系统的适应能力。计算机仿真结果及温度控制实验表明,本文提出的自校正控制算法有较强的自适应能力和满意的控制效果。  The conventional approach to design a series compensator of a feedback control system based on the rootlocus method is a graphical and manualone. In this paper a new apprach to design the series compensator is presented. It, although based on the root locus too, is a kind of anslytic Approachto design, the parameters of the series compensator are determined from thepole and zero formulae. Dcsign procedure is very easy, need not sketch therootlocus plot, and this approach is very easy, need not sketch... The conventional approach to design a series compensator of a feedback control system based on the rootlocus method is a graphical and manualone. In this paper a new apprach to design the series compensator is presented. It, although based on the root locus too, is a kind of anslytic Approachto design, the parameters of the series compensator are determined from thepole and zero formulae. Dcsign procedure is very easy, need not sketch therootlocus plot, and this approach is very easy, need not sketch theputer. In the paper, the pole and zero for mulae of the series for solving by comdeduced. Design procedures and the program chart is given. This approachis proven feasible by the examples.  用传统的根轨迹法设计反馈控制系统的串联校正装置是用手工方式通过图解方法进行的。本文提出的线性定常系统串联校正的设计方法,虽然也是以系统根轨迹为基础,但却是一种解析设计方法,串联校正装置的参数通过极点公式和零点公式解析求解得到,而不需要绘制根轨迹图,设计过程非常简便,特别适合于计算机求解。文中推导了串联校正装置的极点公式和零点公式,给出了设计步骤和程序框图,并通过实例说明了这种方法是可行的。   << 更多相关文摘 
相关查询  



