According to the theory of electromagnetic fields , the large salient synchronous generator with fractional stator slot are calculated and analyzed by the finite element method ( fem ) in this paper . the fourier analysis method is applied to decompose the air gap magnetic density into the basic spatial component and a series of harmonic components and wave shape eigen coefficient of air gap magnetic field are calculated 本文根据电磁场理论，从耦合场的弱耦合角度首先计算了定子具有分数槽绕组的大型水轮发电机的电磁场，采用付立叶谐波分析的方法把气隙磁密分解为空间基波和一系列谐波，进而计算出气隙磁场波形特征系数。
The fatigue accumulation damage of the component has something to do with its model , different model causes different damage speed on the component which will show different magnetic memory characters . the paper build the mathematics model of wave shape of orders con - wave and accumulation damage distribution on several boundary conditions , combining theory deducing , simulation analysis and experiment validation , deducing the relation among fatigue accumulation damage degree , damage speed and magnetic memory characteristic parameters 振动构件疲劳累积损伤与振型有关,不同振型引起的损伤速率不同,具有不同的磁记忆特征。本文将理论推导、仿真分析和实验验证相结合,建立多种边界条件下的各阶谐波波形与累积损伤分布的数学模型,推导疲劳累积损伤度、损伤速率与磁记忆特征参量的关系,并利用模拟试验系统验证和完善,实现利用磁记忆方法对这类累积损伤构件进行早期诊断的目的。
At the same time , there are not many problems for the good wave shape , for example , yawp , outputting du / dt , torque impulse and so on . technology of frequency conversion had developed into an absolute technology . moreover , it is important in many fields , such as reasonable using resource of water , decreasing pollution of environment , saving electric sources , improving work condition , saving materials , reducing costs and improving output 交流变频调速技术的发展由于其地位的重要性，巳迅速发展成为一门独立的技术、学科领域，它对合理利用水资源，减少环境污染，节约电能，改善工作条件，节省原材料，降低成本和提高产量等方面均起着十分重要的作用。
Study and designed analog and digital impluse generator , guided by the signal integrity analysis finished the hardware pcb design of uwb transiver . finally the transmitter and receiver board has been built and got a satisfaction result . totally speaking , the thesis includes the following parts : ( 1 ) research the wave shape of the uwb communication system 以高速电路信号完整性分析为指导,采用最优结构完成了超宽带发射机与接收机pcb电路的设计,本文的研究内容主要包括以下几个方面: ( 1 )分析超宽带通信系统发射机所需信号波形。
What the subject researching is that power energy should be measured with base wave ammeter to power systematic nonlinear user ; and that it is high veracious by base wave ac parameters measurement method to those not bad contaminative . it is well known that all kinds of ac parameters including of base wave and harmonics , but the content of harmonics in power systems increase largely with the mass disturbance to power using high - power electric equipment . which makes wave shape of voltage and current aberrence , so the measurement veracity and reliability decreased largely . at the same time brings out serious infuency to safe run of power system and electric equipment . the power which any non - linear loads consumes can be divided into two sides , one is base power absorbed in power and the other is minus harmonics power 本课题所研究的问题是针对电力系统非线性负载用户采用基波电度表来计量电能；而对谐波污染不严重的线性用户采用基波交流参数测量的方法仍然具有较高的准确性。众所周知，各种交流参量都包含基波和各次谐波，然而随着电力电子技术的迅速发展，大功率的用电设备对电网的干扰也是越来越严重，导致电力系统谐波含量迅速增长，使电压和电流的波形产生严重畸变，测量的准确性和可靠性都大大降低，同时也对电力系统和用电设备的安全运行带来严重的影响。任何一种非线性负载所消耗的功率都可以分为两部分，一部分为从电网中吸取的基波功率，另一部分则是负的谐波功率。
In those experiments wave shapers have been utilized to modify the incident wave so that the condition of constant strain rate is satisfied more sufficiently . the effect of outer factors on the stress equilibrium of early stage in the specimen was analyzed , and the methods to improve the uniformity of stress in specimen at early stage were given . the elastic wave velocity of specimens can be determined by the wave shape fitting of the predicted transmitted wave with the measured transmitted wave at the early stage , furthermore , the shifting - time in shpb data processing can be determined 在shpb实验中采用波形整形技术使入射波的上升沿变宽；分析了影响shpb实验中试件早期应力平衡的外部因素，给出了改善早期应力均匀性的方法；采用透射波的早期预估波形与实测波形作对比的方法确定了shpb实验数据处理中的延迟时间；因而在实验中得到了比较准确的应力应变曲线。
