等效小参量法求解强非线性系统的有效性研究

在所有适用于强非线性分析的符号分析方法中,等效小参量法的有效性和适用性时良好的,但目前其在文献中的应用仅限于20%以下的系统.文章在已有研究的基础上,通过对不同失真度的非线性系统进行求解和比较,得出结论:等效小参量法对于失真度达到30%左右的非线性系统分析是有效的.同经典的扰动法相比较,在非线性较弱时,等效小参量法和扰动法一样能获得精确的结果,但是,在非线性较强时,等效小参量法表现出比较明显的优势.     

强非线性微分方程符号分析法的计算机实现及有效性研究

目前国际上正在寻找一种分析强非线性系统的方法，而等效小参量法目前在文献中可查到的应用仪限于失真度小于20％以下的系统，文章对等效小参量法的原理进行分析，认为该方法可以适用于更强的非线，陆系统分析，在此基础上，使用Matlab语言编程，用符号迭代法求解出一个典型强非线性系统方程的近似解，并用数值分析验证其结果的有效性和准确程度，分析结果表明，等效小参量法能够适用于失真度大于25%以上的系统，满足目前国际上的实际需要。     

等效电源在物理中的应用

本文介绍了串联等效电源和并联等效电源的求法,及利用等效电源求解电路问题,利用等效电源求解电学中的有关问题,可以起到事半功倍的作用。     

对称性网络的等效电阻分析

等效电阻的求解是电路分析的重要内容,但是对于复杂电路往往不易找出串并联关系,求解过程比较麻烦,可以发现对称性网络如果能够找到电路的对称面.进而找到电路的等势点,根据等势点短路或开路来处理,等效变换过程和计算复杂度都会大大减小.     

浅谈二端网络的等效

根据二端网络的等效化简方法和等效定义,推导出了电源模型的七种等效变换。用之求解复杂电路中的电流或某一元件的电压和功率,可简化电路、简化分析问题的过程,使解题快而准。     

含源线性单口网络等效电阻的求解

戴维南定理和诺顿定理为人们求解复杂电路的等效电路提供了一种重要的方法,在实际运用中,难度较大的是如何求解戴维南和诺顿等效电路中的等效电阻,即含源线性单口网络的等效电阻。本文总结了几种常见的求解等效电阻的方法,以及人们在求解过程容易出现的误区。     

交流等效参数观察法计算三极管放大电路的电压放大倍数

文章提出了计算三极管放大电路电压放六倍数的新方法──交流等效参数观察法,将画微变等效电路的方法求解简化为观察交流等效参数求解．     

浅谈戴维宁定理在电路分析中的应用

戴维宁定理是线性电路分析中一个重要的定理。该定理的分析电路中可以简化电路,保留待求部分,将剩余电路等效为一个电压源和一个电阻串联的形式。在电路分析中具有其独特的优势,尤其在求解负载获得最大功率时,运用戴维宁定理就更为方便、快速、高效。戴维宁定理归纳为求解两个参数:开路电压和等效电阻,等效电阻的求解方法有直接求解法、加压求流法和开路电压短路电流法。针对不同的习题采用不同的方法繁简程度是不同的,本文将通过实例来说明电路分析中如何选择适当的方法来求等效电阻,提高解题效率,为电路学习爱好者提供参考。     

浅谈电路分析中的一题多解

根据两类约束可推导出求解电路的基本方法——网孔分析法和节点分析法。对多电源电路,可用叠加原理求解;对复杂电路,可用戴维宁定理求解;对一些特殊电路,可用等效变换法求解。电路分析中通过一题多解,能培养学生的发散思维、创新思维,进而提高教学质量。     

无感蔡氏电路混沌同步控制实验

设计了综合性强的非线性电路实验,基于合适的线性反馈控制器,实现运动行为不同的2个蔡氏电路系统的混沌同步控制。利用非线性限幅函数,设计等效无感蔡氏电路的同步控制电路图,电路结构简单易操作。通过调节电位器的阻值,改变同步控制器的增益,观测实验结果,驱动系统与响应系统达到渐近同步。通过非线性电路系统的开发式实验,培养了学生的创新能力和科研能力,有利于非线性电路课程的深入学习和理解。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.