方法
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Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10~3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.
根据电动振动试验系统对开关功放的要求,提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案,并通过系统仿真进行了原理性论证;然后设计并制作了开关功放的硬件,包括功率转换电路,基于DSP的控制电路,驱动、隔离电路以及保护电路;针对开关功放数学模型不易得出的特点,细致分析了模糊自适应PID控制方法,在此基础上编写了控制程序;研制出一台功率为2kVA,通频带为10~3kHz的三电平脉宽调制开关功放;论文中还探讨了实现大功率开关功放的方法,分析了各种方法的可行性,给出了实现大功率开关功放的思路,并进行了并联开关管实现大功率开关功放的实验。
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It is well known that the multi-value CDMA spreading codes can be designed by means of a pair of mirror multi-rate filter-banks based on some optimizing criteria. The dissertation indicates that there exists a theoretical bound in the performance of its circular correlation property, which can be described by an explicit expression.
研究了基于两带镜像多速率滤波器组来设计的多值CDMA扩展码的方法,并推导出了基于这种方法设计的码序列在循环相关特性方面所能达到的极限,以及达到此理论极限时应满足的条件;在此基础上,提出了一种基于熵最大化准则来产生CDMA扩展码的设计方法。
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After studying current dimension reduction technique and analyzing some normal methods of feature selection, a new approach, named CDF, in feature selection was proposed by comprehensively taking concentration among classes, distribution in class and average frequency in class into account.
本文在研究了现有的特征降维技术的基础之上,对部分常用的特征提取方法做了简要的分析,之后结合类间集中度、类内分散度和类内平均频度,提出了一个新的特征提取方法,即CDF方法。
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Meanwhile, it could be seen that there does not exist a confidence interval with width less than 0.5 because of the property of Poisson distribution. Based on these conditions, the author mainly carried out research into two aspects of this problem as follows. Firstly, by numerical and theoretical analysis, the author compares some existent confidence intervals, for example,"exact" confidence interval, Wald confidence interval and Bayesian confidence interval, and finds some deficiencies points of the confidence intervals, whose modification version has been proposed .Also, several better confidence intervals such asare also presented .Secondly, for given confidence coefficient and interval width, the author constructs a class of asymptotical two-stage interval estimate procedures. At the same time, under varies restriction of confidence coefflcientent interval width, the optional sample size of the first stage has been computed by numerical computation. The numerical computation shows that the method considered in this dissertation have good properties and applied value.
同时,由于Poisson分布的特性,我们知道不存在其参数区间长度小于0.5的置信区间,基于这些情况,我们主要展开了以下两个方面的研究:一是利用数值计算分析与理论分析的方法对现有的若干置信区间如"精确"置信区间,Wald置信区间,Bayes置信区间等进行分析比较,发现了一些缺陷,针对这些缺陷,我们进行适当的修正,并得到几种性质较好的置信区间如:修正大样本区间Jeffreys原则下置信区间二是针对已给定的置信系数与区间长度,我们提出了一种渐近的两阶段区间估计程序,并利用数值计算的方法,在各种置信系数与区间长度限定下,算出了最优的第一阶段观测次数,大量数据表明,本文考虑的方法性态良好,具有应用价值。
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I_for every bounded closed domain in lane.Then we in- troduce the conception of F-homeomorphism for any two pictures in plane,and apply this conception to image recogni- tion.
从数学方法上看,现有图形识别方法多半是采用分析和概率相结合的方法,而描述图形本质特征的拓扑不变量却难以有效应用。
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Moreover, H〓 approach, the modern closed loop frequency domain method, treats the robust optimizing design problem of the system with L2 integrable disturbances.
本文的一个思想是寻求另一种时域方法处理平方可积干扰类不确定性系统设计问题。形式上可归纳为与上述三种方法对称的所谓LQL方法。
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On the basis of three-phase inverting circuit, this paper describes how to make the control method of open loop system in closed loop system.
以三相逆变电路为基础,阐述了如何将开环系统的控制方法用于闭环系统,并且介绍了这种新的控制方法在实际中的应用,证明了该方法的有效性。
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Partition-based method is a practical cluster way to cluster data set, but the efficiency of this method is strongly depend on the pre-known knowledge, especially it is necessary for this method to give the clusters number in advance.
基于划分的方法是聚类分析中较为主要的方法之一,但是由于它对于先验知识的依赖较强,尤其是需要预先指定聚类分析的类别数目,给该方法的应用带来了障碍。
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Aimed at characteristic of heavy oil reservoir, we choose CMG software for numetrial simulation.
本文应用测井解释方法与数值模拟方法结合的新方法来研究剩余油分布,取得了较好的效果。
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This paper studies the causes of noise sensitivity and edge coarseness using usual edge detection presently.
针对目前常用的边缘检测方法对噪声比较敏感,测得的边缘比较粗糙等现象,在传统边缘检测方法的基础上提出了一种基于数据融合的边缘检测方法。
- 推荐网络例句
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I will endeavour to find you some assistance.
我尽力帮你找人帮忙。
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At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.
起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像,后来回台湾,甚至去年在北京,居然也四处看见她的海报,才惊讶她的魅力之大。
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Ah may dee:You are chinese living in a democratic country.
你是居住在民主国家的中国人吧。