查询词典 saturation level

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。

He believes that if the phenomenon of market saturation is the saturation stage, the current saturation of these cities generally concentrated in Guangzhou, Shanghai, Xiamen, Shenzhen and Zhejiang area.

他认为，如果市场饱和的现象是饱和阶段，目前这些饱和城市普遍集中在广州，上海，厦门，深圳和浙江地区。

Based on the above research, analyzes the applicability of AVO in hydrate research:When the hydrate saturation is less than the critical saturation, the AVO curve can indicatewhether there exists any gas below the BSR, and it doesn't work when the hydrate saturationis more than the critical saturation.

在上述工作基础上，讨论用AVO研究水合物的适用范围：介质中水合物饱和度小于临界饱和度时，可以通过AVO曲线变化形态来判断水合物沉积层下伏介质是否含有游离气；而大于临界饱和度时，则难以判断。

The cohesion and the internal friction angle are functions of water content index; cohesion-degree of saturation curve and internal friction angle-degree of saturation curve are gotten by simulating shear experiment through different paths, through which shear strength parameters can be obtained; CDSC and IFADSC are approximating straight lines in the same path when the change of saturation degree is small.

非饱和土抗剪强度的黏聚力和内摩擦角是含水指标的函数；通过模拟不同路径下非饱和土抗剪试验，得到黏聚力-饱和度曲线和内摩擦角-饱和度曲线，进而得到非饱和土抗剪强度指标；在同一路径小区间范围内CDSC和IFADSC曲线近似为直线。

On the basis of ensuring T_2 cutoff value, author analyzed relationship between NMR irreducible water saturation in different cores and porosity、permeability, and established analytic method of irreducible water saturation、movable fluid saturation of vulcanite core. NMR results of some Daqing oilfield vulcanite cores and gas test results of corresponding reservoir and CT results were compared in this ***.

在保证T_2截止值正确的基础上，本文对实验岩心核磁共振束缚水饱和度与孔隙度、渗透率之间的相关性进行了细致分析，建立了火山岩岩心束缚水饱和度、可动流体饱和度分析方法，并对大庆油田部分火山岩岩心核磁分析结果与对应储层试气成果及岩心CT分析结果进行了比较。

Compared with the saturation of waterflood, the higher concentration and injection volume of profile control ,the higher water saturation .Under the same conditions ,the water saturation before forming gel is bigger than that after forming gel .

与水驱后饱和度相比，调剖剂浓度越高、调剖剂注入量越多，水饱和度越高；在同样条件下，未成胶时的水饱和度大于成胶时的水饱和度。

Based on characters of crossplot of water saturation S and resistivity increscent index I, the influences of pore structure and water saturation on n have been analyzed, and calculation methods, including sectional regression method, correlative analysis method of water saturation S and n, are used for calculating the n more accurately.

根据岩电实验中含水饱和度S与电阻增大率I交会曲线的特征，分析了样品孔隙结构及含水饱和度对含水饱和度指数n值的影响，使用了I-S分段回归法、n-S相关分析法以更精确地计算样品的含水饱和度指数n值。

And, the proportion of H(superscript +) in exchangeable acid showed a reverse trend. 2 Exchangeable bases, especially exchangeable Mg(superscript 2+), K(superscript +) and Na(superscript +), in various layers of the soils in the protected fields were much higher than those in the control, not only in content, but also in saturation, whereas soil exchangeable Ca(superscript 2+) did not vary much, but the base saturation and exchangeable Ca(superscript 2+) saturation decreased significantly.

2保护地各土层土壤交换性盐基总量较露地相应层次土壤均有所增加，其中交换性Mg(上标 2+)、K、Na含量均高于露地，而交换性Ca(上标 2+)含量变化不明显；保护地各土层土壤交换性Mg(上标 2+)、K、Na饱和度较露地相应层次土壤均有所增加，但盐基饱和度、交换性Ca(上标 2+)饱和度下降明显。

Another method is fault location algorithm using short data window in the calculation. Because the saturation time of current-transformer lag behind the instant of fault occurrence, it is possible to determine the fault location utilizing the sampling data prior to the saturation. The simulations showed that both of the methods can solve the problem of current-transformer saturation.

方法二是短数据窗定位算法，通过大量仿真发现电流互感器的饱和要滞后于故障短路时刻，短数据窗法就是抢在互感器饱和之前，利用未饱和的有效数据来计算故障点位置。

The results showed compared with the native state the shear strength of rockmass under the saturation state decreased by 11.17%, cohesion force decreased by 16.09%, internal frictional angle decreased by 10.02%.(3) 3D-σFEM numerical simulation software is used to simulate the slope stability on the native state and saturation state. Compared with the nature state the displacement of the discontinuity and stress concentration in the saturation state is largened clearly, the results showed slope stability under the rainfall is weakened.

更多含有天然结构面的岩体试件进行了不同含水量下的强度试验，试验结果证明在岩体试件处于饱水状态时的结构面抗剪强度比天然状态下平均下降了11.17%、粘聚力平均下降了16.09%、内摩擦角平均下降了10.02%；(3)采用3D-σ有限元数值软件对K86+180～K86+470段岩质边坡进行了三维有限元数值模拟，并且分天然状态分阶段开挖和饱水状态分阶段开挖两种不同状况进行了稳定性分析，从分析结果可以看出与天然状态相比，饱水状态下软弱层水平方向位移明显增大，坡脚及软弱层特别是软弱层临空面附近的剪应力值显著增大，并且其安全系数与天然状态相比也显著减小，说明在有大的降雨发生当岩体处于饱水状态时边坡整体稳定性被削弱，边坡失稳可能性增大。

There are different types of personal loans available.

有许多不同类型的个人贷款优惠。

The above mentioned teaching model of spiral rising can be used to avoid rigidness in teaching.

上述螺旋式上升的教学模式，可以避免教学形成模式後的僵化现象。