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Furthermore the computer implementation process and some key topics including map projection system, map projection parameters, algorithm optimization and error computation and control in the transformation process are discussed in this paper.

以此为基础,具体探讨了地图投影变换计算机实现的主要过程,讨论了地图投影体系、投影参数、算法优化和误差控制等投影变换计算机实现中的关键问题

The sufficient conditions to guarantee robust exponential stability for the closed-loop systems are obtained based on Linear Matrix Inequality, moreover, the approach of design of robust H# output feedback controller is introduced.3 The problem of reliable H# control for a class of Lur"e systems with polytopic uncertainties is studied when all control components are operational as well as when some control components experience failures, the design approach of reliable H# controller is also obtained.4 Considering a class of uncertain Lur"e singular system with time-delays, the problem of robust stability is investigated based on Barbalats Lemma and nonsingular linear transformation of model reduction.

针对一类不确定Lur'e奇异时滞系统,基于Barbalat引理以及非奇异降阶变换,讨论了Lur'e奇异时滞系统的鲁棒稳定问题,提出了鲁棒H_∞状态浙江大学博士学位论文反馈控制器的设计方法。5、针对一类具有饱和执行器的不确定Lur'e奇异系统,提出了时滞依赖的鲁棒稳定与鲁棒二次镇定的充分条件,所的结果不需要参数的整定。6、针对任意协方差有界的有色噪声,讨论了一类不确定Lur'e奇异系统的鲁棒凡滤波问题,得出了鲁棒几滤波器设计的充分条件。7、针对一类不确定Lur'e时滞系统,通过线性变换,把它转换成奇异系统,根据奇异系统鲁棒控制理论所得出的鲁棒稳定与鲁棒镇定控制器设计的充分条件具有很小的保守性。

Firstly, based on the force acting on a single-particle, establish a discriminant formula of the sand threshold, and prove that the sand threshold belongs to the cusp catastrophe. Then establish the basic equation of the cusp catastrophe using coordinate transformation and catastrophe theory. Finally, while particle Reynold number and equivalend diameter are the state variables and Shields parameter is the control variables, we can obtain the model of cusp catastrophe of sand threshold, putting those variables into the basic equations of the cusp catastrophe. The model is derived from the mathematics, which has a certain mathematical theory foundation.

首先从单颗沙粒受力分析出发,建立沙床沙粒起动条件判别公式,进而证明了风沙起动属于尖点型突变;然后通过坐标变换和突变理论建立了尖点突变的基本方程;最后本文选择颗粒雷诺数和等效粒径作为控制变量,希尔兹参数作为状态变量,并把它们代入尖点突变的基本方程,经过拓扑变换得到风沙起动的尖点突变模型,并与前人的公式及实验数据进行比较。

To achieve a good performance both statically and dynamically, closed loop control method has to be applied.

为了使变换器具有良好的动静态特性,变换器必须实现闭环控制。

So analyzing the phenomenon of unstable action and subharmonic of DC/DC converter from the angle of linear theory and definiteness theory can not meet the increasing requirement of control performance of DC/DC converter.

因此,仅仅从线性论和确定论角度去分析DC/DC变换器中的不稳定及次谐波现象已不能满足对DC/DC变换器控制性能日益提高的要求。

This paper presents the principle of symmetry vector and introduces the design process of d-q vector controller.

通过分析对称分量法变换原理,以及在TSC+TCR混合型静止无功补偿装置中的应用,介绍了采用矢量变换控制的无功补偿装置的设计。

It is characteristic of higher theorization and abstract conception.

在讨论控制对象的数学模型和分析其性能时,往往需要大量的数学知识如拉氏变换、微分方程、复变函数理论和Z变换等。

Automotive Logistics; inventory control; demand fluctuations; Fourier transform; Z transform; frequency domain

汽车物流;库存控制;需求波动;傅里叶变换; Z变换;频域

This paper presents basic theory of Sparse Matrix Converter, controlling method and zero current commutation; Lastly, this paper provide the simulink waveforms based on SIMULINK.

本文介绍了稀疏矩阵变换器的基本原理、控制策略、零电流变换方法,同时给出了基于SIMULINK 的仿真波形。

A phase-shifted controlling PWM DC/DC full bridge converter with softswitching is proposed and used to realize a constant current power of20A(5~48V).This full bridge converter utilizes the transformer leakageinductance(or the resonant inductance in series with transformersprimary)and the autoecious capacitance of MOSFET to achieveZVS(Zero-Voltage-Switching),as a result it can decrease the switchingwaste,increase the switching frequency,and diminish the power bulk.

本文使用一种通过移相控制进行脉宽调制的软开关全桥变换器来实现20A(5~48V)恒流源,这种全桥变换器利用变压器的漏感、原边串联谐振电感和功率管的寄生电容来实现开关管的零电压开通,降低了开关损耗,提高了开关频率,减小了电源体积。

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Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严,以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆,把帆卷起,系住。

Therefore, positively advances the interest rate marketability reform is one of current our country finance reform important tasks.

因此,积极推进利率市场化改革是当前我国金融改革的重要任务之一。