最大量

ABSTRACT Aiming at problems of trans-vector controller in a vehicle-carried induction motor such as variable rotor and stator resistance following motor temperature, and their inductance varying with flux saturation degrees. Firstly, CSI and VSI are introduced, for CSI, it can hold the advantages both FOC and DTC using stator flux directional, PI parameter and simulation are also introduced. Secondly, equations of IM in the synchronous rotary frame and its static counterpart, as figuring in the saturation condition of magnetic field, are dealt in this paper and the simulation results are presented. Thereafter, the parameter designing of PI trans-vector controller is processed, which features the non-linear model. In practical realization, as neglecting the dynamical change of motor inductance, this paper employs online modification of inductance parameters, according to the flux saturation, then transforms the non-linear equations into linear ones, and so compacts the structure of controller. Thirdly, in view of the maximum torque output is extraordinary requisite when Electrical Vehicle start up, accelerate, and overtake, this paper issues the maximum torque when both inverter and battery capacity is corporeally definite. Fourthly, on-line differentiating and analyzing both rotor's time constants and its flux by using the expanding order reduction and discrete Kalman filter equation are fathomed, in order to realize high-performance trans-vector algorithm, and also the simulation results are presented. Fifthly, the close-loop regenerative brake system, when the EV's torque is set constant, is deduced; at the same time, unification of electric drive model and brake model is executed. Combined with maximum charge current demands, the mathematical model for online yielding torque as a demand.

本论文针对车载异步电机在矢量控制器所遇到的问题：定转子电阻随温度变化及随电机饱和程度变化的转子电感及定子电感而影响电机调速性能提出一套完整的解决方案：分析了电流型逆变器和电压型逆变器在实现矢量控制时控制器参数的计算，分析出对于电流型逆变器在采用定子磁场定向时，其性能同时具有矢量控制和直接转矩控制两者的优势，并对电压型逆变器在转子磁场定向下的模型进行了仿真研究；建立异步电机非线性模型，推导出考虑磁饱和时异步电机在同步旋转坐标系及静止坐标系下的方程，并做出了仿真结果，建立异步电机在非线性模型下的矢量控制调节器的PI参数设计，在实际应用中，若忽略电机电感的动态变化，可以根据当前的磁路饱和状态而在线修正电感参数，从而将非线性方程线性化，降低控制器的复杂度；考虑到电动汽车在起动和加速超车时需要电机有最大转矩输出，本文讨论在逆变器容量一定和电池供电能力有限的情况下电机最大转矩输出问题；推导了异步电机扩展降阶、离散卡尔曼滤波方程在线辨识转子时间常数和转子磁通，用于实现高性能的矢量控制算法，并给出了仿真结果；推导出了电动汽车恒转矩给定的闭环回馈制动系统，实现了电动控制模型和制动模型的统一，而且结合铅酸电池最大充电电流的要求，为制动转矩在线给定建立了数学模型；设计了基于双DSP系统的高性能矢量控制器软硬件框图，并以大量实验数据说明矢量控制在电动汽车应用的实际应用状况。

Because of this, it is the simplest of any DNS to configure, the easiest to update, and the most efficient for networks that experience a lot of updates (for example master servers for dynamic IP address ranges).

因此，它是最简单的DNS配制，最容易更新，对于有大量更新的网络（如动态IP地址范围的主服务器）来说它是最高效的。

The 2nd receives fund to the user, you must let an user feel interesting, you draw out money, actually the most typical resemble game inside, he makes an user abandon be inside, achieve perfection, but there is mediacy between acme and many now stationmaster, increase you more life amusement, you allow such word your user above he can make draw out penny, you see China Internet makes money most, tecent, it is to draw out penny completely, be in China the most valuable is the business that draws out penny.

第二块向用户收钱，你一定要让用户感觉到有意思，你掏钱，其实最典型的像游戏里面，他让用户沉溺在里面，达到极致，但是在极致和现在大量的站长之间有中间状态，增加你更多的生活娱乐性，这样的话你让你的用户在上面他能够叫掏小钱，中国你看互联网赚钱最多的，腾讯，全是掏小钱，在中国最有价值的是掏小钱的生意。

As a result of analysis to many of the results of experiment, checked up on specimens, field investigation and combining with the theories of palaeobotany, comparative morphology, evolutional morphology of vascular plants and taxonomy, it can be concluded as following: the primitive sorts of Cycadaceae are the sorts that pinnate leafs are dichotomy; among these, the sort that pinnate leafs are tripinnate-dichotomy is most primitive, from this sort gradually evolve to bipinnate-dichotomy, to only for monopinnate-dichotomy, from this sort evolve to the sorts that pinnate leafs are simply pinna; among the sorts of simply pinna, the species that segments of megasporophyll possess much more triplicate to monodichotomy are most primitive.

经过大量的实验结果分析、查阅标本和野外调查，结合古植物学、比较形态学、演化植物学和分类学等理论进行分析，认为苏铁科原始的类型为羽叶呈二歧状分叉的种类，其中最原始的又是羽叶呈三回二歧状分叉的种类，从这个羽叶类型逐渐演化出一回二歧状分叉的羽叶类型，再演化出羽叶为单羽状的类型；而单羽状叶的类群中，又以大孢子叶侧裂片具三回、二回及一回二歧状分叉数量多的种类为最原始，而侧裂片二歧状分叉数量少的为较进化，侧裂片无二歧分叉的如拳叶苏铁类为最进化的种类。

The shortest route transportation problem is introduced. The objective of SRTP is to find a vehicle route that minimizes the total distance traveled between supply and demand locations.

场地平整过程中需要进行大量的施工材料的调运工作，这引出了一个最短路径调运问题，目标是找到一个最短的车辆行走路线，使得整个施工过程的总运输距离最短。

Furthermore in a two-correlated-asset world, Target Preference was introduced based on the former stochastic dynamic programming model.

首先，在一个简单的相互独立的两资产世界中，以最大限度实现目标收益刻画企业年金计划受益人的偏好结构，建立了企业年金最优投资战略的随机动态规划模型，并通过大量的Monte Carlo模拟，考察了最优投资战略的特征。

Inductive learning is one of the most important,the corest and the maturest branches in machine learning, but for using the knowledge acquired by learning and improving inductive learning algorithms, there are a lot of problems that are hard to solve using traditional methods.

1引言机器学习是当前人工智能的一个热门学科，归纳学习旨在从大量经验数据中归纳抽取一般的判定规则和模式，是机器学习最重要、最核心也是最成熟的一个分支。

But we can make a good guess about where the urbanising trend will reach its zenith. Simply count which skylines have the most cranes, track where the bulk of the world's concrete is being poured or follow one of the biggest, fastest movements of humanity in history.

但是只要简单数一下哪里的地平线上有最多的起重机，并跟踪一下大量的水泥被浇注在了什么地方，或者哪里正在发生着人类史上规模最大和速度最快的人口迁徙，我们就可以很容易地知道哪里城市化的进程速度将达到顶峰。

If drawing borders is the simplest problem and the mechanisms for sharing Jerusalem the most complex, the argument over the Palestinians' right of return may well be the thorniest of all, because if huge numbers of Palestinians returned, Israel would no longer be a predominantly Jewish state.

如果说划分边境是最简单的问题，如何分享耶路撒冷是最复杂的，那么关于巴勒斯坦人回归权的争论很可能就是最棘手的，因为如果大量巴勒斯坦人回归的话，以色列将不再是犹太人占主导地位的国家。

The question for us is, how shall our series of governments within governments be so administered that it shall always be to the interest of the public officer to serve, not his superior alone but the community also, with the best efforts of his talents and the soberest service of his conscience?

我们面前的问题是，要使政府官员经常感兴趣的是尽他的才智做最大的努力，用他的良心做最大的服务，不仅为他的上级而且为他的社会尽力。我们的政府及其各级政府怎样才能通过给予政府官员大量生活费用补助，来使这种服务引起他最普遍的兴趣？

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。